Stelios's Place

A place for thoughts and ideas

PicAxe AM Transmitter

   This is a small project that I built in less than an hour after checking out the following sites:

Computer Controlled Radio Transmitter
Emergency Egg Locator Beacon

  This simple circuit can be used to track down an R/C Airplane when crashed somewhere on the ground or it could be used to transmit a few words in Morse code as a Beacon.

   The same circuit found in the EELB site is replicated with a PicAxe 08M chip as shown in the image bellow. Voltage needed is 5v. The LED with the resistor helps modulate the signal. You could also use the sound command on pin4 to module the signal with a certain sound.

PicAxe AT Transmitter
The circuit board

   The PicAxe chip runs at 4MHz and can act as an oscillator by using the PMWout command. The pwmout wizard can really help to specify the duty cycle and the period for a given freq. Clocked at 4MHz the PicAxe can act as an 1MHz oscillator. Make sure you use plenty of wire as an antenna.

Comments and suggestions are welcomed.






  • 5.07.2020
    Words & Letters: Connected smart wooden blocks toy. Have a look here.
  • 15.09.2017
    Cubee: An IOT desktop toy that displays the weather. More info here.
  • 04.10.2015
    A wooden treat dispenser your pet using a smart phone and blue-tooth. Have a look here.
  • 08.12.2013
    IKEA Strala Lamp modification! Use a PicAxe chip to add X-mas tunes and control the lamp from you PC through the USB. Have a look here.
  • 20.06.2013
    Little Bes: the lost rabbits - Mini old-school platform game! Have a look here.