Small tests with Rpi like hardware, i2c bus, pcf 8575 and leds...
Just to make leds blinking for hardware and sofware tryouts....
- orangepi one plus / raspberrypi
- pcf8575 (i2c port extender 16 ports)
- resistors : 1k, 100k, ...
- 2n2907
- leds
eanceleur/pcf8575-test
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