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A project log for Make a cheap bike light better!

Hardware and software improvements to a £10 LED cycle light

RobGRobG 11/20/2018 at 09:011 Comment

Have now bodged on a Digispark board (ATTiny85) with code to control the LED modes, so I can now have a 100% mode (yay!) and any other dimming levels/flash patterns that I want. Had to run the micro at 1MHz to get the power consumption down as the puny zener-diode-based supply wasn't man enough for the 18mA the Digispark wanted. (The original PIC-clone draws about 0.6mA, for comparison). 

The total dissipation at max brightness is now up from 1.8A to about 2.2A.

Next step: lower the current-sense resistance to push more current through the LEDs.

Discussions

lidas1234 wrote 01/25/2020 at 13:10 point

hello I am also interested in the circuit with sckech of attiny85 that you did, you would pass it to me thanks

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