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Coin Cell Challenge Entries

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99 projects
1k
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

572
6
9
Touch controlled light-up PCB business card, no microcontroller required!
Project Owner Contributor

Analog Touch Control Business Card

SunnySunny

6.9k
71
60
A little UHF transmitter can be located with a directional antenna.
Project Owner Contributor

Tiny Low-Tech tracking transmitter

TomTom

23.5k
200
157
Multi-year always-on LED replacements for gaseous tritium light sources
Project Owner Contributor

TritiLED

Ted YapoTed Yapo

193
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

81
1
1
Really simple light-up pop up card, using 2 LEDs, copper tape and a CR2032 coincell battery.
Project Owner Contributor

Quick LED Birthday Card

AmandarAmandar

5.4k
545
48
A charlieplexed 20 LED blinker with ATTiny45. Space efficient daisychained LED placing with shared anode/cathode soldering pads.
Project Owner Contributor

LED ring

Jens HaukeJens Hauke

332
198
2
A BCD binary clock that fits inside of a jar
Project Owner Contributor

Binary desk USB jar clock

Marius TaciucMarius Taciuc

307
1
0
A clock with spiritual messages
Project Owner Contributor

Cronos

Marius TaciucMarius Taciuc

730
1
1
Epaper display with Bluetooth LE connectivity
Project Owner Contributor

epaperle

Pavel SorejsPavel Sorejs

4.7k
35
41
Just a simple compact tetris clone using an ATTINY85 and a cheap OLED display.
Project Owner Contributor

pockeTETRIS

dombeefdombeef

612
13
13
Reversing Engineering
Project Owner Contributor

Coin Cell Challenge (1) Shower Battery Charger

Vije MillerVije Miller

3.7k
45
43
A credit card size Wireless Temperature & Humidity Node power by CR2032 Coin Cell
Project Owner Contributor

Wireless Temperature & Humidity Card

Will WhangWill Whang

886
1
2
A Pi Zero and tiny display powered by a coin cell.
Project Owner Contributor

coin2pi

mincepimincepi

6.1k
12
7
This project describes the use of a coin cell for powering the Esp8266 by building a remote control for Phillips Hue Lights
Project Owner Contributor

Solved: Esp8266 powered by coin cell

GelstronicGelstronic

3.5k
33
31
Arcade games on the Micro:bit
Project Owner Contributor

Micro:Boy

de∫hipude∫hipu

6.2k
81
94
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

145
2
3
Busy Bee playing music
Project Owner Contributor

BBsynth

JacquesJacques

531
523
6
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

16.6k
189
178
A handheld game console programmable with (Micro/Circuit)Python.
Project Owner Contributor

µGame

de∫hipude∫hipu

185
2
2
I'll be sharing with you my experience of how i started from a simple idea to a finished product
Project Owner Contributor

VibClock

FoxmjayFoxmjay

482
6
6
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

7.2k
78
93
An Arduino-based watch using 97 LEDs to show the time.
Project Owner Contributor

LiquidWatch

CFCF

615
15
23
Collection of blink SMD soldering kits
Project Owner Contributor

Blink Coin cell toys collection

bobriciusbobricius

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