Lexel can you make an AUX board where half of the leds light above 3,5V and if voltage drobs below that it switch to the other branch and with different color I see what battery charge I have roughly without touching the light.
A while back, I made firmware for a lighted tailcap board which did something like that, but I never actually built one. I could probably make it work better now, though it does still involve having an MCU and I’m not sure there would be enough room on the board.
It basically did a 6-color pattern with R/G/B emitters. It’d spin like a roulette wheel for a moment while measuring voltage, then settle on the appropriate color to indicate charge, and then either stay there or go dim or turn off with an occasional colored blink matching the current voltage. I’d imagine it should work pretty much the same on a front-facing board.
Nice idea. But If you do the easy way I-m really happy with two colors to determine if I’m above or under about 3,5-3,7V.
I recharge my batteries if they are under 3,7V
I recall passive voltage indicator methods, like different resistors for different color LEDs, were attempted… but they didn’t work very well or very consistently. So I went for a more active solution, using an attiny13 to measure voltage and explicitly turn LEDs on/off accordingly. The scale was red for the lowest voltage, then yellow, green, cyan, blue, and purple for totally full. Basically just a 6-step rainbow.
And the emitters were arranged in a circle so it would spin while going through the colors in order. Because bling.
Any battery suggestions?
Flat or Button top?
High Amp but how high?
Manufacturers recommended and ones to avoid?
Max dimensions?
Assume not protected…
Thanks,
Nite Shadow