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Coin Cell Challenge Entries

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98 projects
2.4k
15
25
An annoying, tiny, rickrolling friend
Project Owner Contributor

ATtiny10 rickroller

shlonkinshlonkin

1.1k
436
4
My entry to the Hackaday coin cell challenge: A circuit that turns LEDs into miniature supernovas that light up and explode.
Project Owner Contributor

LED Supernova

cls-02cls-02

118.3k
1.3k
652
A family of tiny robots, each with their own way of life.
Project Owner Contributor

Tiny robot family

shlonkinshlonkin

209
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

320
1
4
Animate the famous SuperMario's mushroom
Project Owner Contributor

Mushroom on wheels

PixJuanPixJuan

6.9k
90
104
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

162
4
1
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

3.6k
17
16
Make Yourself Stand Out by Building a Digital Business Card using an Arduino, OLED/LCD screen and Coin Battery
Project Owner Contributor

Coin Battery Powered Digital Business Card

lagunacomputerlagunacomputer

1.5k
10
16
A 1" round wearable with 8 LEDs
Project Owner Contributor

Tiny Blinky

Nick SayerNick Sayer

8.4k
33
37
A pranking device to annoy your friends... or perhaps an entire college campus.
Project Owner Contributor

ATTiny Low Power Prank

Joseph PrimmerJoseph Primmer

585
7
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

20.1k
104
83
Starting a car with a CR2477 coin cell
Project Owner Contributor

Coin Cell Jump Starter

Ted YapoTed Yapo

121
1
0
My twist on the classic LED Dice kit. Yes, I resort to cheating to beat the kids!
Project Owner Contributor

Cheater Dice

NASCONASCO

624
624
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

7.6k
87
106
An Arduino-based watch using 97 LEDs to show the time.
Project Owner Contributor

LiquidWatch

CFCF

608
607
14
.........Security hacker....... Ethical hacking how to secure my computer
Project Owner Contributor

Computer Hacking

ahmednaseruddinmoizahmednaseruddinmoiz

12.5k
124
114
badgy is a rechargeable coin cell powered ePaper display with WiFi connectivity
Project Owner Contributor

badgy

w4ilunw4ilun

357
1
1
A clock with spiritual messages
Project Owner Contributor

Cronos

Marius TaciucMarius Taciuc

7.3k
43
36
Wait overnight and do your welding job!
Project Owner Contributor

Coin cell battery powered spot welder

jaromir.sukubajaromir.sukuba

3.8k
21
20
In this project I will make an indoor gardening system to take care of my sweet plant and its beautiful flowers
Project Owner Contributor

Arduino Indoor Garden

MEGA DASMEGA DAS

418
253
2
A BCD binary clock that fits inside of a jar
Project Owner Contributor

Binary desk USB jar clock

Marius TaciucMarius Taciuc

5.8k
71
54
Low Power Temperature/Humidity Monitoring
Project Owner Contributor

Gecko Node - Wireless Low Power Sensor

Max.KMax.K

183
2
3
Busy Bee playing music
Project Owner Contributor

BBsynth

JacquesJacques

8.7k
105
104
A Wordwatch using a 11x10 charlieplex matrix.
Project Owner Contributor

Word Wristwatch

CFCF

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