Arduino: Standard project pin-out usage [2009-03-13]
Overview
Default Arduino pin-out usage shared amongst modular examples to allow them to work together.
Profile: Prototype
Pin number |
I/O |
PWM |
Description |
Timer |
---|---|---|---|---|
Analog 0 |
In |
Accelerometer X |
||
Analog 1 |
In |
Accelerometer Y |
||
Analog 2 |
In |
Accelerometer Z |
||
Analog 3 |
In |
Potentiometer 1 |
||
Analog 4 |
In |
Potentiometer 2 |
||
Analog 5 |
In |
Light Dependent Resistor |
||
Digital 0 |
In |
UART: Serial Receive |
||
Digital 1 |
Out |
UART: Serial Transmit |
||
Digital 2 |
Out |
LCD Clock signal (3-wire interface using MC14094 8-bit shift/latch) |
||
Digital 3 |
Out |
Yes |
LED Red |
Timer 2 |
Digital 4 |
Out |
LCD Data signal (3-wire interface using MC14094 8-bit shift/latch |
||
Digital 5 |
Out |
Yes |
LED Green |
Timer 0 |
Digital 6 |
Out |
Yes |
LED Blue |
Timer 0 |
Digital 7 |
Out |
LCD Strobe signal (3-wire interface using MC14094 8-bit shift/latch |
||
Digital 8 |
In |
Control button for LCD menu / command |
||
Digital 9 |
Out |
Yes |
Relay output 1 or Servo motor 1 |
Timer 1 |
Digital 10 |
Out |
Yes |
Relay output 2 or Servo motor 2 |
Timer 1 |
Digital 11 |
Out |
Yes |
Relay output 3 or Servo motor 3 |
Timer 2 |
Digital 12 |
In / Out |
1-wire bus (temperature sensor) or CANBus |
||
Digital 13 |
Out |
Status LED |
Profile: Simple LCD and sensor shield
Pin number |
I/O |
PWM |
Description |
Timer |
---|---|---|---|---|
Analog 0 |
In |
Light Dependent Resistor |
||
Analog 1 |
In |
Potentiometer |
||
Analog 2 |
In |
Button 1 |
||
Analog 3 |
In |
Button 2 |
||
Digital 0 |
In |
UART: Serial Receive |
||
Digital 1 |
Out |
UART: Serial Transmit |
||
Digital 2 |
Out |
LCD Clock signal (3-wire interface using MC14094 8-bit shift/latch) |
||
Digital 3 |
Out |
Yes |
LCD Data signal (3-wire interface using MC14094 8-bit shift/latch |
Timer 2 |
Digital 4 |
Out |
LCD Data signal (3-wire interface using MC14094 8-bit shift/latch |
||
Digital 5 |
In / Out |
Yes |
1-wire bus (temperature sensor) |
Timer 0 |
Digital 6 |
Out |
Yes |
Relay output 1 |
Timer 0 |
Digital 7 |
Out |
Relay output 2 |
Design trade-offs
- Save PWM outputs for those things that can really use PWM.
- For cheap LCD display, use minimal 3-wire interface and only consume 3 Arduino pins, not 6 or more.
- You can get a Serial LCD display, requiring only a single Arduino pin, but they are more expensive.
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