Recently found out about the Make Space. It’s great that you started something in State College. I hope this sort of problem/solution seeking is OK on this forum.
Anyway, so here’s my problem. I’m working on a automatic chicken coop door. I’m using an arduino uno, h-bridge, dc motor, endstops, 30w solar panel and 12v 7ah battery. Power consumption is an issue. I’m curious if anyone can answer the following questions:
I’m using interrupts on the endstops. Pins are obviously set to inputs. Is there significant current draw when an endstop is held closed?
if I choose to run the arduino off 12v instead of 5v, is there less current draw? I’m assuming less current but same wattage overall. I ask because a 5v linear regulator is inefficient and the switching regulator i have has a display which draws a little extra current. I’m trying to eliminate all unnecessary stuff.
The h-bridge (just the IC component SN754410) has been finicky. If i run the same voltage as the arduino, it works. If I try to give it a higher voltage on vcc2 it gets weird. works only sometimes. I figure there’s a current drop and tossed in some capacitors to help but no luck. Anybody have experience using these?
Is it more power efficient to run a dc motor slowly, and longer ~20sec with a low voltage (5v) or faster and shorter ~8sec with a higher voltage (12v)? This isn’t really an option until I figure out the h-bridge though.
My knowledge of this stuff is spotty at best as I’m new to the circuitry bit. If you need more information, as i’m sure you will, please ask.