Tagged Questions

2
votes
1answer
206 views

What limit switches would be necessary for use in series with a DeWalt 20V cordless drill battery?

I am on a senior design team at school. We have designed a mechanical system that uses a DeWalt 20V drill motor to drive the system. It is powered by the stock lithium ion batteries. I need to ...
1
vote
1answer
251 views

Making connections to coin-cell batteries

I'm working on a project that will be using several coin cells in parallel to a flex PCB. The product will be disposable with non-replaceable batteries, so I'm looking for ways to attach the ...
9
votes
7answers
2k views

LEDs on a (battery) budget! – How can I lower the current through a LED without using up the battery?

EDIT: Here is a much brief version, the meandering motivated version is probably subsumed in the parent question on general battery life optimizations. How can I lower the current into a LED ...
16
votes
3answers
1k views

Making a battery last a long time in a microcontroller circuit

I'm hoping to power an ATtiny85V for a nice long time on some small battery, probably a coin cell. I've looked into the software side, and my code is watchdog timer driven, has unused analog and ...
3
votes
1answer
77 views

Are the specs for the “Ears of the World” challenge reasonable?

I saw a post today on the Make blog about a challenge to create an extremely cheap FM/SW radio kit for developing nations. The organization sponsoring the challenge distributes donated wind-up powered ...