| Arduino Pin | Proper Name | Function |
|---|---|---|
| digital pin 0 | PD0 | RXD |
| digital pin 1 | PD1 | TXD |
| digital pin 2 | PD2 | External Step |
| digital pin 3 | PD3 | External Dir |
| digital pin 4 | PD4 | Step Pump 1 |
| digital pin 5 | PD5 | Dir Pump 1 |
| digital pin 6 | PD6 | Limit min Pump 1 |
| digital pin 7 | PD7 | Limit max Pump 1 |
| digital pin 8 | PB0 | Motors disable |
| digital pin 9 | PB1 | |
| digital pin 10 | PB2 | Step Pump 2 |
| digital pin 11 | PB3 | Dir Pump 2 |
| digital pin 12 | PB4 | Limit min Pump 2 |
| digital pin 13 | PB5 | Limit max Pump 2 |
| analog input 0 | PC0 | Servo Pump1 |
| analog input 1 | PC1 | Servo Pump2 |
| analog input 2 | PC2 | |
| analog input 3 | PC3 | Idle signal |
| analog input 4 | PC4 | Setup Button |
| analog input 5 | PC5 | Ready signal |
Idle and Setup are active low
RAMPS 1.4 see http://reprap.org/mediawiki/images/archive/c/ca/20131210184132!Arduinomega1-4connectors.png
- D16 is idle
- D17 is setup
- D23 is ready
Setup:
M42 P17 S0
M42 P17 S255
G-Coder header:
M42 P16 S255
M42 P17 S255
M226 P23 S-1
G-Code footer:
M42 P16 S0