This was a project bot from a workshop, a mobile controlled bot using frequency of the digits as a signals to function.
It had simple frequency decoding chip for the mobile connected to it, and another transmitting chip to make the motors function.
The concept was simple, make a phone call between the controlling phone and the phone attached to the bot, while the call is on, you can use the digits as control pad to the bot, which means it’s radio frequency signals went as far as the telecom signals.
The decoding board and the chip is available on robomart and with a simple relay system it can be attached to any bot(for high power motors etc).
VJ's Creations 