Charge level indicator?
I need a nice, simple charge indicator. I have a battery pack that holds 4 AA NiMH batteries. Normally they charge up to 1.3V per cell or 4X1.3=5.2V total. I have a solar trickle charger on there too and I'd like to have a little charge indicator.
-low part count
-small (it's on my bike helmet)
I was thinking something with a pushbutton an LED or two and a zener diode. Something that turns on the LED at greater than 5.2 volts. But I don't have experience with zener diodes.
Has anyone seen a system like this around? Can you think one up?