Bor Gullet
Member
I'm drawing up a Teensy compass with a fake needle, powered by battery. I am trying to get a full day out of it and the mechanism to move the needle is obviously the biggest power draw. I think I can get about a full day with a budget of 1200mAh and this stepper: https://www.digikey.com/product-detail/en/seeed-technology-co-ltd/108990003/1597-1203-ND/5487797 if I drive it at 3.3V.
3.3V / 25Ohms = .132A
1200 mAh / 132 mA = 9.09 hours
(Maybe more if there is a bit of friction that holds the needle in place when it is un-powered?)
What I really want though, is something smaller and even lower power. What might I consider instead of this solution, or is this about as good as I'm going to get? I see super small steppers on Alibaba, but with no impedance or drawings provided, so not sure what they actually are.
3.3V / 25Ohms = .132A
1200 mAh / 132 mA = 9.09 hours
(Maybe more if there is a bit of friction that holds the needle in place when it is un-powered?)
What I really want though, is something smaller and even lower power. What might I consider instead of this solution, or is this about as good as I'm going to get? I see super small steppers on Alibaba, but with no impedance or drawings provided, so not sure what they actually are.