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Xadow IO pin mapping

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Xadow IO pin mapping

Single reference page for all pin information including:-

  • How to use each pin in your Arduino code
  • Xadow FFC to Atmega32u4 pin mapping
  • pins that have interrupts and timers
  • the 2 serial ports, IIc and ISP
  • additional on board IO, that might be hacked

The tables provide different views of the data and are especially useful when you are planning which modules to use and which IO pins for direct use!

Xadow FFC IO bus and matching Arduino and Atmega information and example Arduino code.

Xadow FFC pins Arduino Atmega32u4 pins
Name IO function Alternate use # IO Pin code example(s) Name (interrupts in red) # Notes
P1 Digital Pin ISP SCK 1 15 PinMode(15, OUTPUT); digitalWrite(15, HIGH); PB1(PCINT1/SCLK) 9 ISP SMD header pads also on rear of Xado Main board
P2 Digital Pin ISP MOSI 2 16 PinMode(16, OUTPUT); digitalWrite(16, HIGH); PB2(PDI/PCINT2/MOSI) 10
P3 Digital Pin ISP MISO 3 14 PinMode(14, OUTPUT); digitalWrite(14, HIGH); PB3(PDO/PCINT3/MISO) 11
P4 Analogue Pin Digital pin! 4 A5 analogWrite(A5, 128); pinMode(A5, OUTPUT); digitalWrite(A5, HIGH); PF0(ADC0) 41 Arduino analogue pins can also be used as digital pins!
P5 Digital Pin IIC SCL 9 3 PinMode(3, OUTPUT); digitalWrite(3, HIGH); PD0(OC0B/SCL/INT0) 18
P6 Digital Pin IIC SDA 10 2 PinMode(2, OUTPUT); digitalWrite(2, HIGH); PD1 (SDA/INT1) 19
P7 Digital Pin Serial Rxd 11 0 PinMode(0, OUTPUT); digitalWrite(0, HIGH); PD2(RXD/INT2) 20 See Xadow BLE/GPS examples for these serial pin usage info.

NOT same serial port uploading code–see Red/Green LED below.

P8 Digital Pin Serial Txd 12 1 PinMode(1, OUTPUT); digitalWrite(1, HIGH); PD3(TXD/INT3) 21

Some MORE Xadow IO pins - only on the Main module, NOT on the FFC bus!

Xadow pins Arduino Atmega32u4 pins
Name IO function Alternate use # IO Pin code example(s) Name (interrupts in red) # Notes
Red LED Rx - 17 PinMode(17, OUTPUT); digitalWrite(17, HIGH); PB0(SS/PCINT0) 8 Serial port uploading code
Green LED Tx - 11 PinMode(11, OUTPUT); digitalWrite(11, HIGH); PB7(PCINT7/OC0A/OC1C/!RTS) 12
Wake - 10 Have not yet connected and validated this! PB^/A10/D10 30 On board switch – you need super soldering skills to access this!

Note: Reset switch is connected to Atmega32u4 Reset pin 13 via a diode – so no access to the 32u4 IO pin AT THE RESET SWITCH!


The BIG Table of Xadow modules and the IO bus pin use for each module.

Why such a big complicated table? Well it brings together all of the IO information in one place, but more importantly it lets you see which IO pins are still available once you have selected several Xadow modules! Also the schematic has different FFC pin numbers to the rest of the wiki documentation!

Notes:-

1. Remember that IIC devices are daisy chained – that is they can connect in parallel, so you can have more than one IIC device connected to the same pins!

2. Need more IO pins? You may be able to use ONE pin for several different uses, the same way the vibration motor and buzzer are sharing one pin, or in some situations you can use the same pin for different purposes at DIFFERENT TIMES. For example you might set a pin as output to trigger an ultrasonic sensor, then change the pin to input to detect when the signal is received!

3. Most IIC modules {except the Main Board module, LED, RTC}, ALSO have IIC breakout pins.

So items in purple in the IIC SCL & IIC SDA columns do NOT also have breakout pins!

4. ** Additional details highlighted in yellow in center of table document the ADDITIONAL breakout pins on each Xadow module!

5. ? = Don't know, or not yet verified!

SCK
MOSI
MISO
A5
3
2
1
0
Arduino Pin name
Interrupts in red--------> PB1(PCINT1/SCLK) PB2(PDI/PCINT2/MOSI) PB3(PDO/PCINT3/MISO) PF0(ADC0) PD0(OC0B/SCL/INT0) PD1(SDA/INT1) PD2(RXD/INT2) PD3(TXD/INT3) Atmega32u4 pin Name
IIC = I2C
9 10 11 41 18 19 20 21 Atmega32u4 pin#
P1, 1 P2, 2 P3, 3 P4, 4 P5, 9 P6, 10 P7, 11 P8,12 FFC pin Name, #
Xadow Modules Module Control Mode & Address
Digital Pin
Digital Pin
Digital Pin
Analog or Digital Pin
IIC SCL
IIC SDA
Serial Rxd
Serial Txd
Xadow Pin function
3-Axis Accelerometer
IIC 0x53
SCK MOSI MISO
A5
SCL
SDA
Rxd TxD
BaroMeter
IIC 0x77
SCK MOSI MISO
A5
SCL
SDA
Rxd TxD
BLE Slave
Serial
RX/TX
Plus pads specific to BLE on rear
Breakout
None!
SCK MOSI MISO
A5
SCL
SDA
Rxd TxD + Grove I2C & Serial sockets
LED Controller
IIC 0x04
SCL
SDA
OLED
IIC 0x3C
SCL
SDA
Vibration Motor
Digital Signal
H
H
Disconnect module BEFORE using ISP
RTC
IIC 0x68
SCL
SDA
rear pad connect INTB – Int0???
Buzzer
Digital Signal
H
?
?
H
?
?
?
?
Disconnect module BEFORE using ISP
Digital Compass
IIC 0x1E
?
?
?
?
?
?
?
?
Motor
TBD
?
?
?
?
?
?
?
?
GPS
Serial
?
?
?
?
?
?
RX/TX
Storage
IIC 0x50 & 0x51
?
?
?
?
?
?
?
?
Main Board
?IIC master =0x00?
ISP – SCK ISP MOSI ISP MISO
SCL
SDA
All via SMD pads on rear.
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