Test image version: 2022-04-04-raspios-bullseye-armhf.img Raspberry pi 4B
sudo nano /boot/config.txt
Ensure that I2C is on, and then restart the system.
After restart, address 48 can be detected by I2C address detection command.
i2cdetect -y 1
Ensure that jumper caps are connected to PCF.
Download sample code pcf8591
sudo python pcf8591_adc.py
4-channel print AD value
sudo python pcf8591_dac.py
The LED lamp changes with the output value of DAC, and the brightness changes.
Make sure that the jumper caps are connected to the LED.
Download GPIO_Test.py to raspberry pi.
sudo python GPIO_Test.py
The power indicator LED is always on, and the GPIO connection LED is turned on in turn, and then turned off in turn, continuously circulating.
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