XBee Stacker

The Stacker is an XBee radio-sized Arduino-compatible microcontroller that can be “stacked” directly underneath the radio. It is intended for use with devices that already use the XBee’s 20-pin footprint. Future designs could easily utilize other microcontrollers or host sensors. The goal is to create plug-and-play tools for prototyping new concepts that extend the popular radio’s feature set. A few iterations have created a prototype that works well, supports USB programming, wireless programming, I2C, SPI, digital and analog I/O!

XBee Stacker 2

This is the next iteration of an Arduino-compatible board the size of an XBee that fits right underneath the radio. It uses the ATMega32U4 so in Arduino you can program it as a Leonardo board.

Features

I2C
SPI
scriptable interruption of:
- all UART transactions
- XBee pin sleep controls
local support for:
- association indicator
- commissioning button
17 total digital i/o pins (14 Arduino, 4 XBee)
- 6 configurable as ADC analog inputs
- 4 configurable as PWM analog outputs
- 2 attachable interrupts
USB serial programming
wireless programming
EEPROM
multiple UARTs
Use of all Arduino libraries, e.g. servo, stepper, displays, capacitive sensing, rfid, sd cards etc.

Pinouts

Bottom of XBee Stacker 2:

Physical Pin	Function	Arduino Connection
1	Power supply	VCC
2	Arduino software TX	D11 (softserial TX)
3	Arduino software RX, PWM	D10 (softserial RX)
4	MISO (spi), digital i/o	MISO (spi)
5	input for Arduino reset	RESET
6	digital i/o, analog output	D9
7	MOSI (spi), analog input, digital i/o	MOSI (spi)
8	analog input, digital i/o	D8/A8
9	PWM, interrupt, digital i/o	D7
10	GND	GND
11	SCK (spi), digital i/o	SCK (spi)
12	SDA (i2c) interrupt, digital i/o	D2/SDA (i2c)
13	SCL (i2c), interrupt, PWM, digital i/o	D3/SCL (i2c)
14	analog input, digital i/o	D4/A6
15	PWM, digital i/o	D5 pwm
16	analog input, PWM, digital i/o	D6/A7 pwm
17	analog input, digital i/o	A3
18	analog input, digital i/o	A2
19	analog input, digital i/o	A1
20	analog input, digital i/o	A0

Top of XBee Stacker 2

XBee Physical Pin	Function	XBee Connection
1	Power supply	VCC
2	Arduino RX	D0 RX
3	Arduino TX	D1 TX
4	–	–
5	–	-
6	–	–
7	–	–
8		–
9	control for pin sleep	D12
10	GND	GND
11	–	–
12	CTS	A4
13	–	–
14	voltage reference	VCC
15	association output	<led>
16	RTS	A5
17	Arduino Reset (p1) via cap.	<capacitor> for reset
18	-	–
19	-	–
20	–	–