|RGB wireless bike light|
So I created them wireless bike lights that beep and flash like a car alarm arming/disarming. When in the on mode the head light is on and a string of LED will pulse allowing them to see and be seen.
For the electronics I used one of my Arduino based RFnode as a base but to drive the power hungry LEDs I used a STA301A connected to 3 of the PWM pins of the ATmega168. This allowed me to drive 3 strings of LEDs with PWM support.
I got a little creative and limited by space and time I mounted the STA301A to the RFnode with some hot glue and mounted surface mount resistors directly to the pins of the IC. Most of the wiring was air wiring as I did not have time to get a customer board fabricated.
For the radio instead of using the nRF24l01+ I found some small key finder fobs that can stay powered from a coin cell battery for months so decided to use them as I could get the power consumption down to less then 1mAh when in sleep mode.
I was in a bit of a rush to get the units finished before Burningman so I don't have any pictures of the hardware jammed back into the bike light casing and the extra wiring of the LEDs yet. I might add that one they get back.