Arduino - BrendonWatsonLab/Digital-Homecage GitHub Wiki
Arduino Mega 2564 Rev3
Technical/Expert Reference:
Internally uses a Atmega2560 chip. With a pin mapping available here: https://www.arduino.cc/en/Hacking/PinMapping2560
Signal Ports:
When a beambreak state changes, or a value is supposed to be written out to one of the solenoids, a signal port is used.
| White Wire Pin | Atmega2560 Pin Name | Atmega2560 Pin Number | Meaning | I/O |
|---|---|---|---|---|
| D5 | PE3 (OC3A/AIN1) | 5 | Food 1 | Boolean Input |
| D7 | PH4 (OC4B) | 16 | Food 2 | Boolean Input |
| D3 | PE5 (OC3C/INT5) | 7 | Water 1 | Boolean Input |
| D6 | PH3 (OC4A) | 15 | Water 2 | Boolean Input |
| D8 | PH5 (OC4C) | 17 | Solenoid Power 1 | Boolean Input |
| D11 | PB5 (OC1A/PCINT5) | 24 | Solenoid Power 2 | Boolean Input |
Relayed Current State Ports:
| Event Type | Output Signal | Arduino Output Pin | Atmega2560 Pin Name | Atmega2560 Pin Number | LJ 15 Add-On Port # |
|---|---|---|---|---|---|
| Beambreak | Water 1 | D22 | PA0 (AD0) | 78 | EIO0 |
| Beambreak | Water 2 | D24 | PA2 (AD2) | 76 | EIO1 |
| Beambreak | Food 1 | D26 | PA4 (AD4) | 74 | EIO2 |
| Beambreak | Food 2 | D28 | PA6 (AD6) | 72 | EIO3 |
| Dispense | Water 1 | D23 | PA1 (AD1) | 77 | EIO4 |
| Dispense | Water 2 | D25 | PA3 (AD3) | 75 | EIO5 |
| Dispense | Food 1 | D27 | PA5 (AD5) | 73 | EIO6 |
| Dispense | Food 2 | D29 | PA7 (AD7) | 71 | EIO7 |
Find the port and bit for Arduino pin 22
By looking at the pinout map above, you will find "PA0" next to pin 22.
Arduino pin 22 is connected to ATMega2560 pin PA0 on the Arduino circuit board. Port A and bit 0.
bit 0 in DDRA controls the direction (input/output)
bit 0 in PORTA controls the output (high/low)
You don't need to care about MCUCR, unless you want to disable pull-up on all pins.