Geiger Counter from SparkFun Electronics

This is a USB powered Geiger Counter equipped with an ATMega168 that can be programmed in circuit using one of the programmers below. Simply plug the unit into USB (make sure you have FTDI drivers installed), open a terminal program to the correct COM port at 9600bps, and you will see random bits being generated from the random background radiation. Here at SparkFun, on average, we get about 20 counts a minute.


  • 5V@30mA input
  • LND712 Geiger tube
  • ATMega168
  • Power and status LEDs
  • TTL output pin from tube

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