help with DYP-ME007TX and Waspmote (arduino)

Just connect this sensor to a digital port on your arduino and start a serial connection (software serial).

Example:
arduino.cc/en/Reference/SoftwareSerialAvailable
You use only rxPin, so you must define a unused port for txPin.

If you don’t know what to do please search for beginner tutorial and read the arduino reference:
arduino.cc/en/Reference/HomePage