teh:
The modules that I am using are the “XBee 1mW Wire Antenna” (http://www.sparkfun.com/commerce/produc … ts_id=8665).I can’t seem to find anything on the spec page about the DOUT, DIN voltages.
The XBee specs are in the XBee document #90000982_B.pdf on page 8.
VIL Input Low Voltage All Digital Inputs: Max (0.35 * VCC) V
VIH Input High Voltage All Digital Inputs: Min (0.7 * VCC) V
VOL Output Low Voltage: IOL = 2 mA, VCC >= 2.7 V, Max 0.5 V
VOH Output High Voltage: IOH = -2 mA, VCC >= 2.7 V, Min (VCC - 0.5) V
These XBee modules are not 5V tolerant! Look at the supply voltage spec of 2.8 - 3.4V and the Input voltage spec.
Both SparkFun regulated explorer boards have a sort of 5V to 3.3v level shifter. Look at the schematic for these boards and you will see a diode in series with the XBee’s DIN pin. This also requires that the XBee’s internal pull-up is enabled on the Din pin (see command PR on page 51).
Search this forum for more discussion about the series diode on the regulated XBee boards.