quick wiring question
I'm bought a broken scooter from the thrift store, and I took it apart, rebuilt and rewired it.
I have it working now, but I need to be able to charge the batteries. Right now I have the batteries wired straight to the motor with an on/off switch on the handlebars. Where in the circuit do I wire the charger port? The one I have has two wires coming out of it. Do I wire it in series?
I also want to build a simple circuit to let me know when the batteries are charging and when they're full. Any ideas?
Thanks in advance for your help.
The charger goes right across the battery (get polarity right). I've attached a crude schematic.
Be sure swith is off so that you aren't 'charging the motor. Usually the charger has LED's Red => Charging Green => Fully charged.
thanks, that's just what I needed.
Simple 4 Led visual voltage level for 12V battery from Radio Shack's "Getting Started in Electronics".
Nowadays you can usually get a digital volt meter for less than $5 so it's hardly worth the trouble of building this unless maybe you want it incorporated permanently into the bike as a voltage level indicator.
Lower 2 LED's could be red, 3rd yellow, 4th green, for full charge. You would have to calibrate it with a voltmeter to set off LED's at proper voltage points. Haven't checked lately but Digikey probably has this as a single "all-in-one" chip now.
Last edited by wernmax; 05-16-09 at 11:24 PM.