It was a valued export in Silk Road trading, but the manufacturing process was kept secret. During the Tang Dynasty (618-907) and the Song Dynasty (960-1279), varieties of paper were developed for different purposes.
April 7, 2015 Written by controlguru. Like the P-Only controller, the Proportional-Integral (PI) algorithm computes and transmits a controller output (CO) signal every sample time, T, to the final control element (e.g., valve, variable speed pump).
Step 2: Interface the PIR Motion Sensor to the Raspberry Piâs Input GPIO Read. Now, we can try reading the output from the PIR motion sensor. The sensor outputs a digital HIGH (5V) signal when it detects a person. Copy and paste the following code into your Raspberry Pi and save it as a python file: pirtest.py: