TRRSTAN Cellbot Kit

• Control Up to 4 servos via your phone's 3.5mm audio jack.


• Includes 2 continuous rotation servos.


• All SMT parts pre-soldered, unless you ask us not to


• Open source software for Android


• Control your Cellbot over the internet


• Sensor upgrade kit available soon


• DIY, fun to build


• 5V 1500ma boost/buck power supply keeps the speed consistent until the battery is drained, and allows use of many different types of batteries.


• 3A Schottky Diode provides extra current directly from the battery for motor start-up loads.


• iPhone support in the works

TRRSTAN does not use a microcontroller to drive the servos, instead it uses your phones's headphone jack. We believe it to be the lowest price programmable mobile robotics platform available today. The control circuit is very simple, the only chip used is a quad optocoupler that rectifies the audio channels using the diode property of the leds. When the audio signal is above ground it turns on one led, and when the audio signal is below ground it turns on the other. In this way we can control 4 servos total. The optocoupler also boosts the signal to 5v and squares off the wave nicely. The other parts on the board are for the 5v buck boost power supply. There is also space on the board to add 2 0-5v sensors and two quadrature encoders and two bump switches. These communicate back to the phone via the microphone line. This sensor upgrade kit is still in prototype.