user69718: Update 12/11
Working through the answer posted.

Upload reset appearance - [Works blinks correctly.]
Convince yourself that reset appearance code reliable indicates DTR resets. [Opened the serial monitor 5-6 times, nothing changed or blinked]
10uF cap between Arduino Nano RESET and adjacent GND. [Done]
Plug the board back in and you should see the LED Blink rapidly for the power-on (not DTR) reset. [Blinks rapidly same as after upload of sketch in Step one]
Open (or Reopen) the serial monitor and see that the LED remains OFF. [No LED's]
Break the RESET leg of whatever circuit you chose for defeating DTR reset. Upload the ArduinoISP sketch [Uploaded and verified, no problem]
You should see a signature check error like this: [Yes this error occured same message as you posted]
Upload Empty sketch [ IT WORKS !!!!!]
Check using one of my previous sketchs [WOOT! It works]

Thanks, that resolved the issue!! (although I've aready bought a universal programmer because I didn't think I would ever get it working).
Update - 11/Nov
As suggested, I have taken the nano out of any board and it is dangling from the USB cable. I have tried to upload the default sketch.
void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}

using the settings:

Board Attiny22/44/84
Processor Attiny84
Programmer Arduino as ISP

I still get the problem of programmer not responding. Did this for all 3 nanos I have available.
===
Update - 11/nov
I have now wiped all the IDE from my machine and reloaded. I have attempted to program an ATmega168PA instead of the tiny. Same problem.
Update - 10/nov:
After swapping between 2 different nanos and different capacitors to check that the cap is working. I noticed some different behavour. Nano A fails as below, however Nano B fails, but the message is slightly different. Instead of resp=0x00 I have resp=0xFF
Also on Nano B the L light doesn't flash it is on constantly and the 10 getsync messages go really fast.

I really could do with a solution if anyone has one.
I am trying to upload a sketch into a ATTiny84 with Nano as "Arduinio as ISP". This worked last week, same sketch, no changes. I have attempted to troubleshoot:
Changed ATTiny chips, changed between 3 different Nanos (and even bought another which also failed), I have changed all the USB cables, changed all the wires. I have installed the IDE on different machines.
In summary, I have tried:

3 different machines: Linux, Raspberry Pi, Windows 10
7 different ATTiny84 chips (I have ten, but don't want to use the other 3 in case this is bricking them!)
4 different Nanos
different USB cables, different wires, replaced the capacitors

I have triple checked the configuration. Nothing seems to fix the problem.
I have no issue with any of the Nanos, I can use them directly, but just can't seem to use them to push into the AVR. It worked with the same configuration for weeks, now it doesn't. I'm really scratching my head.
I'm using:

ATTiny core by David A. Mellis
Boards: Attiny24/44/84
Processor: Attiny84
Clock: Internal 1 Mhz
Programmer: Arduinio as ISP
"Upload using Programmer"

Verbose Error messages:
Arduino: 1.8.13 (Linux), Board: "ATtiny24/44/84, ATtiny84, Internal 1 MHz"

/home/rick/arduino-1.8.13/arduino-builder -dump-prefs -logger=machine -hardware /home/rick/arduino-1.8.13/hardware -hardware /home/rick/.arduino15/packages -hardware /home/rick/Arduino/hardware -tools /home/rick/arduino-1.8.13/tools-builder -tools /home/rick/arduino-1.8.13/hardware/tools/avr -tools /home/rick/.arduino15/packages -built-in-libraries /home/rick/arduino-1.8.13/libraries -libraries /home/rick/Arduino/libraries -fqbn=attiny:avr:ATtinyX4:cpu=attiny84,clock=internal1 -vid-pid=1A86_7523 -ide-version=10813 -build-path /tmp/arduino_build_476590 -warnings=default -build-cache /tmp/arduino_cache_440110 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avrdude.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -prefs=runtime.tools.arduinoOTA.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.arduinoOTA-1.3.0.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.avr-gcc.path=/home/rick/arduino-1.8.13/hardware/tools/avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=/home/rick/arduino-1.8.13/hardware/tools/avr -verbose /home/rick/Arduino/Light_detector_Example/Light_detector_Example.ino
/home/rick/arduino-1.8.13/arduino-builder -compile -logger=machine -hardware /home/rick/arduino-1.8.13/hardware -hardware /home/rick/.arduino15/packages -hardware /home/rick/Arduino/hardware -tools /home/rick/arduino-1.8.13/tools-builder -tools /home/rick/arduino-1.8.13/hardware/tools/avr -tools /home/rick/.arduino15/packages -built-in-libraries /home/rick/arduino-1.8.13/libraries -libraries /home/rick/Arduino/libraries -fqbn=attiny:avr:ATtinyX4:cpu=attiny84,clock=internal1 -vid-pid=1A86_7523 -ide-version=10813 -build-path /tmp/arduino_build_476590 -warnings=default -build-cache /tmp/arduino_cache_440110 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avrdude.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -prefs=runtime.tools.arduinoOTA.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.arduinoOTA-1.3.0.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.avr-gcc.path=/home/rick/arduino-1.8.13/hardware/tools/avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=/home/rick/arduino-1.8.13/hardware/tools/avr -verbose /home/rick/Arduino/Light_detector_Example/Light_detector_Example.ino
Using board 'ATtinyX4' from platform in folder: /home/rick/.arduino15/packages/attiny/hardware/avr/1.0.2
Using core 'arduino' from platform in folder: /home/rick/arduino-1.8.13/hardware/arduino/avr
Detecting libraries used...
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=attiny84 -DF_CPU=1000000L -DARDUINO=10813 -DARDUINO_attiny -DARDUINO_ARCH_AVR -I/home/rick/arduino-1.8.13/hardware/arduino/avr/cores/arduino -I/home/rick/.arduino15/packages/attiny/hardware/avr/1.0.2/variants/tiny14 /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp -o /dev/null -DARDUINO_LIB_DISCOVERY_PHASE
Alternatives for SendOnlySoftwareSerial.h: [SendOnlySoftwareSerial]
ResolveLibrary(SendOnlySoftwareSerial.h)
  -> candidates: [SendOnlySoftwareSerial]
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=attiny84 -DF_CPU=1000000L -DARDUINO=10813 -DARDUINO_attiny -DARDUINO_ARCH_AVR -I/home/rick/arduino-1.8.13/hardware/arduino/avr/cores/arduino -I/home/rick/.arduino15/packages/attiny/hardware/avr/1.0.2/variants/tiny14 -I/home/rick/Arduino/libraries/SendOnlySoftwareSerial /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp -o /dev/null -DARDUINO_LIB_DISCOVERY_PHASE
Using cached library dependencies for file: /home/rick/Arduino/libraries/SendOnlySoftwareSerial/SendOnlySoftwareSerial.cpp
Generating function prototypes...
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=attiny84 -DF_CPU=1000000L -DARDUINO=10813 -DARDUINO_attiny -DARDUINO_ARCH_AVR -I/home/rick/arduino-1.8.13/hardware/arduino/avr/cores/arduino -I/home/rick/.arduino15/packages/attiny/hardware/avr/1.0.2/variants/tiny14 -I/home/rick/Arduino/libraries/SendOnlySoftwareSerial /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp -o /tmp/arduino_build_476590/preproc/ctags_target_for_gcc_minus_e.cpp -DARDUINO_LIB_DISCOVERY_PHASE
/home/rick/arduino-1.8.13/tools-builder/ctags/5.8-arduino11/ctags -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives /tmp/arduino_build_476590/preproc/ctags_target_for_gcc_minus_e.cpp
Compiling sketch...
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-g++ -c -g -Os -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -MMD -flto -mmcu=attiny84 -DF_CPU=1000000L -DARDUINO=10813 -DARDUINO_attiny -DARDUINO_ARCH_AVR -I/home/rick/arduino-1.8.13/hardware/arduino/avr/cores/arduino -I/home/rick/.arduino15/packages/attiny/hardware/avr/1.0.2/variants/tiny14 -I/home/rick/Arduino/libraries/SendOnlySoftwareSerial /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp -o /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp.o
Compiling libraries...
Compiling library "SendOnlySoftwareSerial"
Using previously compiled file: /tmp/arduino_build_476590/libraries/SendOnlySoftwareSerial/SendOnlySoftwareSerial.cpp.o
Compiling core...
Using precompiled core: /tmp/arduino_cache_440110/core/core_attiny_avr_ATtinyX4_cpu_attiny84,clock_internal1_8328ca5f502560caf6997d9e8039b097.a
Linking everything together...
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-gcc -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections -mmcu=attiny84 -o /tmp/arduino_build_476590/Light_detector_Example.ino.elf /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp.o /tmp/arduino_build_476590/libraries/SendOnlySoftwareSerial/SendOnlySoftwareSerial.cpp.o /tmp/arduino_build_476590/../arduino_cache_440110/core/core_attiny_avr_ATtinyX4_cpu_attiny84,clock_internal1_8328ca5f502560caf6997d9e8039b097.a -L/tmp/arduino_build_476590 -lm
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-objcopy -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0 /tmp/arduino_build_476590/Light_detector_Example.ino.elf /tmp/arduino_build_476590/Light_detector_Example.ino.eep
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-objcopy -O ihex -R .eeprom /tmp/arduino_build_476590/Light_detector_Example.ino.elf /tmp/arduino_build_476590/Light_detector_Example.ino.hex
Using library SendOnlySoftwareSerial in folder: /home/rick/Arduino/libraries/SendOnlySoftwareSerial (legacy)
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-size -A /tmp/arduino_build_476590/Light_detector_Example.ino.elf
Sketch uses 1666 bytes (20%) of program storage space. Maximum is 8192 bytes.
Global variables use 152 bytes (29%) of dynamic memory, leaving 360 bytes for local variables. Maximum is 512 bytes.
/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/bin/avrdude -C/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf -v -pattiny84 -cstk500v1 -P/dev/ttyUSB0 -b19200 -Uflash:w:/tmp/arduino_build_476590/Light_detector_Example.ino.hex:i 

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf"
         User configuration file is "/home/rick/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : /dev/ttyUSB0
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00

avrdude done.  Thank you.

Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.




VCC & GND connected
White wire (Pin 9) -> D13
Yellow wire 1 (Pin 8) -> D12
Red wire (Pin 7) -> D11
Yellow wire 2 (Pin 4) -> D10
10 Capacitor between RST & Gnd

The only change I can remember making was adding a library for SerialOutOnly. But I did a clean install on the Windows and Rasberry with only the ATTiny libraries and it still does the same time.
People missed my comment, so I've uploaded a second photo of the entire breadboard. It is powered there are two wires which were out of frame in the first photo.


user62523: From your picture, it looks like your ATtiny84 is not powered (connected to unpowered power rails).
The positive (red) and negative (blue) rails on both sides of a breadboard are usually not connected. You should either manually connect the power rails on opposite sides of your breadboard or connect your ATtiny power pins (1 and 14) to the corresponding rail on the other side of your board. See below (apologies for the crude drawing).


69718: <p>Update 12/11
Working through the answer posted.</p>
<ul>
<li>Upload reset appearance - [Works blinks correctly.]</li>
<li>Convince yourself that reset appearance code reliable indicates DTR resets. [Opened the serial monitor 5-6 times, nothing changed or blinked]</li>
<li>10uF cap between Arduino Nano RESET and adjacent GND. [Done]</li>
<li>Plug the board back in and you should see the LED Blink rapidly for the power-on (not DTR) reset. [Blinks rapidly same as after upload of sketch in Step one]</li>
<li>Open (or Reopen) the serial monitor and see that the LED remains OFF. [No LED's]</li>
<li>Break the RESET leg of whatever circuit you chose for defeating DTR reset. Upload the ArduinoISP sketch [Uploaded and verified, no problem]</li>
<li>You should see a signature check error like this: [Yes this error occured same message as you posted]</li>
<li>Upload Empty sketch [ IT WORKS !!!!!]</li>
<li>Check using one of my previous sketchs [WOOT! It works]</li>
</ul>
<p>Thanks, that resolved the issue!! (although I've aready bought a universal programmer because I didn't think I would ever get it working).</p>
<p>Update - 11/Nov</p>
<p>As suggested, I have taken the nano out of any board and it is dangling from the USB cable. I have tried to upload the default sketch.</p>
<pre><code>void setup() {
  // put your setup code here, to run once:

}

void loop() {
  // put your main code here, to run repeatedly:

}
</code></pre>
<p>using the settings:</p>
<ul>
<li>Board Attiny22/44/84</li>
<li>Processor Attiny84</li>
<li>Programmer Arduino as ISP</li>
</ul>
<p>I still get the problem of programmer not responding. Did this for all 3 nanos I have available.</p>
<p>===</p>
<p>Update - 11/nov
I have now wiped all the IDE from my machine and reloaded. I have attempted to program an ATmega168PA instead of the tiny. Same problem.</p>
<p>Update - 10/nov:</p>
<p>After swapping between 2 different nanos and different capacitors to check that the cap is working. I noticed some different behavour. Nano A fails as below, however Nano B fails, but the message is slightly different. Instead of resp=0x00 I have resp=0xFF</p>
<p>Also on Nano B the L light doesn't flash it is on constantly and the 10 getsync messages go really fast.</p>
<hr />
<p>I really could do with a solution if anyone has one.</p>
<p>I am trying to upload a sketch into a ATTiny84 with Nano as &quot;Arduinio as ISP&quot;. This worked last week, same sketch, no changes. I have attempted to troubleshoot:</p>
<p>Changed ATTiny chips, changed between 3 different Nanos (and even bought another which also failed), I have changed all the USB cables, changed all the wires. I have installed the IDE on different machines.</p>
<p>In summary, I have tried:</p>
<ul>
<li>3 different machines: Linux, Raspberry Pi, Windows 10</li>
<li>7 different ATTiny84 chips (I have ten, but don't want to use the other 3 in case this is bricking them!)</li>
<li>4 different Nanos</li>
<li>different USB cables, different wires, replaced the capacitors</li>
</ul>
<p>I have triple checked the configuration. Nothing seems to fix the problem.</p>
<p>I have no issue with any of the Nanos, I can use them directly, but just can't seem to use them to push into the AVR. It worked with the same configuration for weeks, now it doesn't. I'm really scratching my head.</p>
<p>I'm using:</p>
<ul>
<li><a href="https://github.com/damellis/attiny" rel="nofollow noreferrer">ATTiny core</a> by David A. Mellis</li>
<li>Boards: Attiny24/44/84</li>
<li>Processor: Attiny84</li>
<li>Clock: Internal 1 Mhz</li>
<li>Programmer: Arduinio as ISP</li>
<li>&quot;Upload using Programmer&quot;</li>
</ul>
<p>Verbose Error messages:</p>
<pre><code>Arduino: 1.8.13 (Linux), Board: &quot;ATtiny24/44/84, ATtiny84, Internal 1 MHz&quot;

/home/rick/arduino-1.8.13/arduino-builder -dump-prefs -logger=machine -hardware /home/rick/arduino-1.8.13/hardware -hardware /home/rick/.arduino15/packages -hardware /home/rick/Arduino/hardware -tools /home/rick/arduino-1.8.13/tools-builder -tools /home/rick/arduino-1.8.13/hardware/tools/avr -tools /home/rick/.arduino15/packages -built-in-libraries /home/rick/arduino-1.8.13/libraries -libraries /home/rick/Arduino/libraries -fqbn=attiny:avr:ATtinyX4:cpu=attiny84,clock=internal1 -vid-pid=1A86_7523 -ide-version=10813 -build-path /tmp/arduino_build_476590 -warnings=default -build-cache /tmp/arduino_cache_440110 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avrdude.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -prefs=runtime.tools.arduinoOTA.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.arduinoOTA-1.3.0.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.avr-gcc.path=/home/rick/arduino-1.8.13/hardware/tools/avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=/home/rick/arduino-1.8.13/hardware/tools/avr -verbose /home/rick/Arduino/Light_detector_Example/Light_detector_Example.ino
/home/rick/arduino-1.8.13/arduino-builder -compile -logger=machine -hardware /home/rick/arduino-1.8.13/hardware -hardware /home/rick/.arduino15/packages -hardware /home/rick/Arduino/hardware -tools /home/rick/arduino-1.8.13/tools-builder -tools /home/rick/arduino-1.8.13/hardware/tools/avr -tools /home/rick/.arduino15/packages -built-in-libraries /home/rick/arduino-1.8.13/libraries -libraries /home/rick/Arduino/libraries -fqbn=attiny:avr:ATtinyX4:cpu=attiny84,clock=internal1 -vid-pid=1A86_7523 -ide-version=10813 -build-path /tmp/arduino_build_476590 -warnings=default -build-cache /tmp/arduino_cache_440110 -prefs=build.warn_data_percentage=75 -prefs=runtime.tools.avrdude.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -prefs=runtime.tools.avrdude-6.3.0-arduino17.path=/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17 -prefs=runtime.tools.arduinoOTA.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.arduinoOTA-1.3.0.path=/home/rick/.arduino15/packages/arduino/tools/arduinoOTA/1.3.0 -prefs=runtime.tools.avr-gcc.path=/home/rick/arduino-1.8.13/hardware/tools/avr -prefs=runtime.tools.avr-gcc-7.3.0-atmel3.6.1-arduino7.path=/home/rick/arduino-1.8.13/hardware/tools/avr -verbose /home/rick/Arduino/Light_detector_Example/Light_detector_Example.ino
Using board 'ATtinyX4' from platform in folder: /home/rick/.arduino15/packages/attiny/hardware/avr/1.0.2
Using core 'arduino' from platform in folder: /home/rick/arduino-1.8.13/hardware/arduino/avr
Detecting libraries used...
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=attiny84 -DF_CPU=1000000L -DARDUINO=10813 -DARDUINO_attiny -DARDUINO_ARCH_AVR -I/home/rick/arduino-1.8.13/hardware/arduino/avr/cores/arduino -I/home/rick/.arduino15/packages/attiny/hardware/avr/1.0.2/variants/tiny14 /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp -o /dev/null -DARDUINO_LIB_DISCOVERY_PHASE
Alternatives for SendOnlySoftwareSerial.h: [SendOnlySoftwareSerial]
ResolveLibrary(SendOnlySoftwareSerial.h)
  -&gt; candidates: [SendOnlySoftwareSerial]
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=attiny84 -DF_CPU=1000000L -DARDUINO=10813 -DARDUINO_attiny -DARDUINO_ARCH_AVR -I/home/rick/arduino-1.8.13/hardware/arduino/avr/cores/arduino -I/home/rick/.arduino15/packages/attiny/hardware/avr/1.0.2/variants/tiny14 -I/home/rick/Arduino/libraries/SendOnlySoftwareSerial /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp -o /dev/null -DARDUINO_LIB_DISCOVERY_PHASE
Using cached library dependencies for file: /home/rick/Arduino/libraries/SendOnlySoftwareSerial/SendOnlySoftwareSerial.cpp
Generating function prototypes...
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-g++ -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=attiny84 -DF_CPU=1000000L -DARDUINO=10813 -DARDUINO_attiny -DARDUINO_ARCH_AVR -I/home/rick/arduino-1.8.13/hardware/arduino/avr/cores/arduino -I/home/rick/.arduino15/packages/attiny/hardware/avr/1.0.2/variants/tiny14 -I/home/rick/Arduino/libraries/SendOnlySoftwareSerial /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp -o /tmp/arduino_build_476590/preproc/ctags_target_for_gcc_minus_e.cpp -DARDUINO_LIB_DISCOVERY_PHASE
/home/rick/arduino-1.8.13/tools-builder/ctags/5.8-arduino11/ctags -u --language-force=c++ -f - --c++-kinds=svpf --fields=KSTtzns --line-directives /tmp/arduino_build_476590/preproc/ctags_target_for_gcc_minus_e.cpp
Compiling sketch...
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-g++ -c -g -Os -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -MMD -flto -mmcu=attiny84 -DF_CPU=1000000L -DARDUINO=10813 -DARDUINO_attiny -DARDUINO_ARCH_AVR -I/home/rick/arduino-1.8.13/hardware/arduino/avr/cores/arduino -I/home/rick/.arduino15/packages/attiny/hardware/avr/1.0.2/variants/tiny14 -I/home/rick/Arduino/libraries/SendOnlySoftwareSerial /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp -o /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp.o
Compiling libraries...
Compiling library &quot;SendOnlySoftwareSerial&quot;
Using previously compiled file: /tmp/arduino_build_476590/libraries/SendOnlySoftwareSerial/SendOnlySoftwareSerial.cpp.o
Compiling core...
Using precompiled core: /tmp/arduino_cache_440110/core/core_attiny_avr_ATtinyX4_cpu_attiny84,clock_internal1_8328ca5f502560caf6997d9e8039b097.a
Linking everything together...
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-gcc -Os -g -flto -fuse-linker-plugin -Wl,--gc-sections -mmcu=attiny84 -o /tmp/arduino_build_476590/Light_detector_Example.ino.elf /tmp/arduino_build_476590/sketch/Light_detector_Example.ino.cpp.o /tmp/arduino_build_476590/libraries/SendOnlySoftwareSerial/SendOnlySoftwareSerial.cpp.o /tmp/arduino_build_476590/../arduino_cache_440110/core/core_attiny_avr_ATtinyX4_cpu_attiny84,clock_internal1_8328ca5f502560caf6997d9e8039b097.a -L/tmp/arduino_build_476590 -lm
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-objcopy -O ihex -j .eeprom --set-section-flags=.eeprom=alloc,load --no-change-warnings --change-section-lma .eeprom=0 /tmp/arduino_build_476590/Light_detector_Example.ino.elf /tmp/arduino_build_476590/Light_detector_Example.ino.eep
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-objcopy -O ihex -R .eeprom /tmp/arduino_build_476590/Light_detector_Example.ino.elf /tmp/arduino_build_476590/Light_detector_Example.ino.hex
Using library SendOnlySoftwareSerial in folder: /home/rick/Arduino/libraries/SendOnlySoftwareSerial (legacy)
/home/rick/arduino-1.8.13/hardware/tools/avr/bin/avr-size -A /tmp/arduino_build_476590/Light_detector_Example.ino.elf
Sketch uses 1666 bytes (20%) of program storage space. Maximum is 8192 bytes.
Global variables use 152 bytes (29%) of dynamic memory, leaving 360 bytes for local variables. Maximum is 512 bytes.
/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/bin/avrdude -C/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf -v -pattiny84 -cstk500v1 -P/dev/ttyUSB0 -b19200 -Uflash:w:/tmp/arduino_build_476590/Light_detector_Example.ino.hex:i 

avrdude: Version 6.3-20190619
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is &quot;/home/rick/.arduino15/packages/arduino/tools/avrdude/6.3.0-arduino17/etc/avrdude.conf&quot;
         User configuration file is &quot;/home/rick/.avrduderc&quot;
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : /dev/ttyUSB0
         Using Programmer              : stk500v1
         Overriding Baud Rate          : 19200
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 1 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 2 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 3 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 4 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 5 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 6 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 7 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 8 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 9 of 10: not in sync: resp=0x00
avrdude: stk500_recv(): programmer is not responding
avrdude: stk500_getsync() attempt 10 of 10: not in sync: resp=0x00

avrdude done.  Thank you.

Problem uploading to board.  See http://www.arduino.cc/en/Guide/Troubleshooting#upload for suggestions.

</code></pre>
<p><a href="https://i.stack.imgur.com/7tLDl.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/7tLDl.jpg" alt="My setup" /></a></p>
<ul>
<li>VCC &amp; GND connected</li>
<li>White wire (Pin 9) -&gt; D13</li>
<li>Yellow wire 1 (Pin 8) -&gt; D12</li>
<li>Red wire (Pin 7) -&gt; D11</li>
<li>Yellow wire 2 (Pin 4) -&gt; D10</li>
<li>10 Capacitor between RST &amp; Gnd</li>
</ul>
<p>The only change I can remember making was adding a library for SerialOutOnly. But I did a clean install on the Windows and Rasberry with only the ATTiny libraries and it still does the same time.</p>
<p>People missed my comment, so I've uploaded a second photo of the entire breadboard. It is powered there are two wires which were out of frame in the first photo.</p>
<p><a href="https://i.stack.imgur.com/MkG4m.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/MkG4m.jpg" alt="enter image description here" /></a></p>
 62523: <p>From your picture, it looks like your ATtiny84 is not powered (connected to unpowered power rails).</p>
<p>The positive (red) and negative (blue) rails on both sides of a breadboard are usually not connected. You should either manually connect the power rails on opposite sides of your breadboard or connect your ATtiny power pins (1 and 14) to the corresponding rail on the other side of your board. See below (apologies for the crude drawing).</p>
<p><a href="https://i.stack.imgur.com/pDn85.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/pDn85.jpg" alt="enter image description here" /></a></p>
