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Coin Cell Challenge Entries

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99 projects
173
3
3
HuBik is 8 by 8 red-green LED matrix. It's powered by coin-cell battery and controlled by ATmega32.
Project Owner Contributor

8×8 RG LED module

Martin HubMartin Hub

1k
5
15
The Blinking Coin Cell Christmas Tree runs entirely off the power of a coin cell with a bit of a gravity assist.
Project Owner Contributor

Gravity Assisted Blinking Coin Cell Christmas Tree

Frank MilburnFrank Milburn

5.2k
17
28
A persistence of vision (POV) display with five 0805 LEDs piggy back on an ATTiny13.
Project Owner Contributor

Tiny POV

Jens HaukeJens Hauke

279
109
4
.........Security hacker....... Ethical hacking how to secure my computer
Project Owner Contributor

Computer Hacking

ahmednaseruddinmoizahmednaseruddinmoiz

5.5k
57
49
A little UHF transmitter can be located with a directional antenna.
Project Owner Contributor

Tiny Low-Tech tracking transmitter

TomTom

697
0
1
A Pi Zero and tiny display powered by a coin cell.
Project Owner Contributor

coin2pi

mincepimincepi

4.7k
64
77
Ever since I have my own company I wanted to have a PCB business card. What not add an OLED display to it?
Project Owner Contributor

Electrocard

Michael TeeuwMichael Teeuw

17.2k
182
139
Multi-year always-on LED replacements for gaseous tritium light sources
Project Owner Contributor

TritiLED

Ted YapoTed Yapo

292
153
4
The first digital watches had this red bubble display, you need to push a button to see the time.
Project Owner Contributor

Retro Wristwatch

saarbastlersaarbastler

1k
10
9
TESTERA is the exclusive handy tool that allows you to test components like LED, Capacitor, Transistors, IR LED, LDR, etc.
Project Owner Contributor

TESTERA: New ERA of testing

Patel DarshilPatel Darshil

285
5
4
A gift tag for the holiday season including a 7x10 LED matrix, which can show a personal text message.
Project Owner Contributor

Happy Holidays gift tag

CFCF

1k
13
19
A small, cheap ($2 BOM), open source charger for LIR2032 and 20mm rechargeable coin cells built from an MCP73831.
Project Owner Contributor

LIR2032 Coin Cell Charger

Jon ThomassonJon Thomasson

369
4
5
This tiny low-power wireless module can run on a coin battery for a looong time.
Project Owner Contributor

Cloony wireless module

Martin HubMartin Hub

1.8k
12
13
A clone of National Semiconductor's LM3909 IC using discrete components on a PCB.
Project Owner Contributor

Disintegrated LM3909 - 1.5V LED Flasher

DillonDillon

277
1
0
A battery powered, periodic infrared beacon for a geocaching puzzle
Project Owner Contributor

Low power IR beacon

piotrb5e3piotrb5e3

972
4
8
Using a CR2477 coin cell and two 350 farad capacitors, I manage to get a loaded Lionel train to make one circuit around the Christmas tree.
Project Owner Contributor

Coin Cell Train

Mike RigsbyMike Rigsby

10.2k
54
71
If you like happy, easy to build projects, this is not for you. This project is only for people who like to be miserable and frustrated.
Project Owner Contributor

An Unfortunate SMD Project

MakersBoxMakersBox

108
3
0
The goal of this project is to design sensor, actuator & alert circuits that can be woven into clothing and be powered by coin cells.
Project Owner Contributor

WeavCoin - coin cell powered clothing

Natalia MykhaylovaNatalia Mykhaylova

100.3k
1.2k
573
A family of tiny robots, each with their own way of life.
Project Owner Contributor

Tiny robot family

shlonkinshlonkin

227
191
0
A keychain sized gamer based on the attiny85 and a single coin cell battery.
Project Owner Contributor

TinyPong

SaulSaul

244
1
0
A clock with spiritual messages
Project Owner Contributor

Cronos

Marius TaciucMarius Taciuc

10.2k
129
123
A handheld game console programmable with (Micro/Circuit)Python.
Project Owner Contributor

µGame

ðeshipuðeshipu

828
7
7
Using an Atmega MCU to develop a car tracker
Project Owner Contributor

TRACKER

madivakmadivak

345
3
4
Coin Battery Powered Open Fridge Alarm.
Project Owner Contributor

Open Fridge Alarm

mariusz_nowak_engmariusz_nowak_eng

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