The ingredients for this DIY Pressure sensor
1 x JeeNode v4
is essentially a small PCB with an ATMega328 microprocessor. The
compatible, which means you can create your sketches using
the Arduino IDE and upload the compiled sketch to the JeeNode almost just as easy
as you can with an 'original' Arduino. One additional thing is needed for that: a
2 x Digi XBee Series 2 modules
XBee and XBee-PRO
modules provide wireless connectivity to end-point devices in ZigBee mesh networks. XBee modules are ideal for low-power, low-cost applications.
1 x Sparkfun XBee RS232 board
makes it easy to connect a XBee module to a serial port. There are other
solutions for USB, like the Digi XStick.