Dosing / nutrient controller for the CropDroid automation system.
Dosing pumps can be operated on digital pins 02, 03, 05, 06, 07, 08, 09.
Arduino communicates over serial using digital pins 00 (RX) and 01 (TX).
Arduino communicates with both the W5100 and SD card using the SPI bus (through the ICSP header).
On all boards, pin 10 is used to select the W5100 and pin 4 for the SD card.
Digital pins 10, 11, 12, and 13.
Digital pins 50, 51, and 52.
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