Info Manual

Wireless helmet brake light (doorbell hack)

I got an idea with the first post HERE on how to make such related gadget out from those cheap wireless doorbell assembly made by china. With some minor modification of the circuit can be configured to work as a Wireless Stoplight add on for motorcycle.
Photo shown is the donor gadget, transmitter on the left and receiver on the right side. The supply voltage of the transmitter is 12 volts, and can be directly tap on the motorcycle stoplight supply path, that when the brake is press, will enable it to transmit signal towards its receiver.If we analyze their circuit, the transmitter push button switch just enable and disable the supply, and when used on the brake light, the switch will be omitted, so no other modification is needed for it to work on this hack.

For the Receiver, the sound emitted by the module of course is not needed, and the sound chip must be disregard, and in its place, a switching transistor and a pair of 3 RED LED array is to be used. The receiver voltage supply is actually  3 volts only, Three led in series cannot be powered by that voltage so led forward voltage must be selected. In this hack, i'll be replacing the 3 volts up to 3.7 volts such as cellphone battery so that no other additional circuit that will waste battery power.