user7277: I recently upgraded my MacBook Pro to Mojave. Now I'm not able to connect to my Arduino board with ch340g usb-to-serial chip. It is a Arduino board with AtMega 328 and ESP8266 integrated. I downloaded the drivers from the Chinese website for the ch340 and also removed old installations, like some tutorials tell me. I just can't get a /dev/cu.* port (besides the /dev/cu.Bluetooth-Incoming-Port.
I do have an external FTDI usb to serial board. I didn't get to it to try to connect it.
Does someone know how to get the ch340 to work on MacOS Mojave, or as a last resort: use the FTDI to program/monitor the Arduino board?

user50866: this my problem too.
i found these solutions 

mac-usb-serial app
a topic in arduino forum 


make sure delete old usb driver in these path 
/Library/Extensions/usbserial.kext  
and  
 /System/Library/Extensions/usb.kext  

then install it again download link

user7277: Ok, this is the solution for me: 
remove all old drivers:
sudo rm -rf /Library/Extensions/usbserial.kext
sudo rm -rf /System/Library/Extensions/usb.kext

Now reboot the computer.
And then (very important, because it took me 10 cables to find the right one) use a fully connected cable ;-) 
Now I have these ports: 
/dev/cu.wchusbserial1410
/dev/cu.usbserial-1410


7277: <p>I recently upgraded my MacBook Pro to Mojave. Now I'm not able to connect to my Arduino board with ch340g usb-to-serial chip. It is a Arduino board with AtMega 328 and ESP8266 integrated. I downloaded the drivers from the Chinese website for the ch340 and also removed old installations, like some tutorials tell me. I just can't get a <code>/dev/cu.*</code> port (besides the <code>/dev/cu.Bluetooth-Incoming-Port</code>.</p>

<p>I do have an external FTDI usb to serial board. I didn't get to it to try to connect it.</p>

<p>Does someone know how to get the ch340 to work on MacOS Mojave, or as a last resort: use the FTDI to program/monitor the Arduino board?</p>
 50866: <p>this my problem too.
i found these solutions </p>

<ol>
<li>m<a href="https://www.mac-usb-serial.com/" rel="nofollow noreferrer">ac-usb-serial</a> app</li>
<li>a topic in <a href="https://forum.arduino.cc/index.php?topic=570440.0" rel="nofollow noreferrer">arduino</a> forum 
<br></li>
</ol>

<p>make sure delete old usb driver in these path <br>
/Library/Extensions/usbserial.kext  <br>
and  <br>
 /System/Library/Extensions/usb.kext  <br>
 <hr>
then install it again <a href="https://drive.google.com/file/d/1lUYkw-mCOekJjY1MVA5YuEbERHNWNCZW/view" rel="nofollow noreferrer">download link</a></p>
 7277: <p>Ok, this is the solution for me: </p>

<p>remove all old drivers:</p>

<pre><code>sudo rm -rf /Library/Extensions/usbserial.kext
sudo rm -rf /System/Library/Extensions/usb.kext
</code></pre>

<p>Now reboot the computer.</p>

<p>And then (very important, because it took me 10 cables to find the right one) use a <strong>fully connected</strong> cable ;-) </p>

<p>Now I have these ports: </p>

<pre><code>/dev/cu.wchusbserial1410
/dev/cu.usbserial-1410
</code></pre>
