Ok, so in the process of trying to “optimize” the driving experience, I made a few mistakes. Fortunately, I’ve been able to fix almost all of them. The regen circuit now is activated by the brake lights, so the car now drives just like a car. Very cool.
While I was fussing around in the controller compartment, I tried to get the DC-DC converter to work. However, this resulted in me frying my DC-DC converter (fortunately, this is an relatively inexpensive mistake). The good thing is that EV Components has more of them.
I’m hoping to get the tachometer working tomorrow. I spent about 3 hours getting a neat circuit put together that will drive some indicator lights. One is the “ready” signal and the other is the “fault” signal – both from the motor controller. Since I know I’ll want to see these lights while driving and while testing, I set it up so there are two of each lights – one set in the dash and one set near the motor controller.
Radio Shack was my friend, as was Tim Kutscha for his diagram. Naturally, I didn’t do it exactly his way, but that is the fun of all of this. This version uses 2 resisters – one for each input and 4 transisters – one for each light. The box has 12v ready LEDs, the other lights are the more usual incandescent lights.
The circuit is inside this box:
Circuit for showing "Ready" and "Fault"