Close

Coin Cell Challenge Entries

Learn more
98 projects
287
6
11
Here I have a Maker Gummi Bear that can be worn as an electronic badge. It contains LEDs and is powered by a single coin cell battery.
Project Owner Contributor

Maker Gummi Bear

RachelRachel

5.9k
968
55
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

3.3k
25
36
Display falling tetris blocks on a oled screen made into an ear ring. It's powerded by a coin cell.
Project Owner Contributor

oled earrings

DanielDaniel

831
6
10
A small quiz game that reads questions from web and shows them on a small oled dispay, using a 3.6V battery, an ESP8266-01 and two buttons
Project Owner Contributor

ESP8266 Oled Mini Quiz

Giulio PonsGiulio Pons

3.5k
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

1.7k
19
26
Small sized 555 timer based piano.
Project Owner Contributor

555 piano

Alexander RyzhkovAlexander Ryzhkov

6.9k
43
36
Wait overnight and do your welding job!
Project Owner Contributor

Coin cell battery powered spot welder

jaromir.sukubajaromir.sukuba

2.5k
17
19
A minimalist 1.5V coin cell led tree with all components and power source confined within a mini breadboard.
Project Owner Contributor

Joule Thief Mini Christmas Tree

Chris ChungChris Chung

3.6k
12
26
An Arduino powered birthday reminder device that'll wish you happy birthday for 50 years on a single CR2450 coin cell.
Project Owner Contributor

Birthday Alarm That'll Run for 50 Years!

Vishnu M AieaVishnu M Aiea

487
4
7
Coin cell powered 555 timer with ultraviolet LED coated with glow in the dark paint to mimic a firefly.
Project Owner Contributor

Fireflies

Jux CrowJux Crow

715
7
6
Lorentz dreams about metal horses
Project Owner Contributor

pic-o-matic

Robert MatejaRobert Mateja

6.3k
24
34
A persistence of vision (POV) display with five 0805 LEDs piggy back on an ATTiny13.
Project Owner Contributor

Tiny POV

Jens HaukeJens Hauke

762
9
7
CR2032 Coin Cell LCD Projector. Digispark Attiny85 module, LCD panel harvested from ebay mp3 player.
Project Owner Contributor

Coin Cell LCD Projector

ChallengingStage888ChallengingStage888

202
3
3
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

293
1
4
Animate the famous SuperMario's mushroom
Project Owner Contributor

Mushroom on wheels

PixJuanPixJuan

341
2
2
Hateful electrons with fearless mosfets join forces against elements
Project Owner Contributor

picoSTING

Robert MatejaRobert Mateja

336
1
1
A clock with spiritual messages
Project Owner Contributor

Cronos

Marius TaciucMarius Taciuc

934
7
6
A quite persistent little blinker
Project Owner Contributor

Blinky_40

Robert MatejaRobert Mateja

3.5k
21
18
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

749
8
12
Touch controlled light-up PCB business card, no microcontroller required!
Project Owner Contributor

Analog Touch Control Business Card

SunnySunny

4k
47
45
A credit card size Wireless Temperature & Humidity Node power by CR2032 Coin Cell
Project Owner Contributor

Wireless Temperature & Humidity Card

Will WhangWill Whang

6.7k
36
34
A small railgun , augmented with neodymium magnets and powered from a single LIR2032 rechargeable coin cell battery.
Project Owner Contributor

Coin cell powered railgun

consciousfleshconsciousflesh

601
603
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

5.1k
66
51
Low Power Temperature/Humidity Monitoring
Project Owner Contributor

Gecko Node - Wireless Low Power Sensor

Max.KMax.K

failed to load.

Going up?

About Us Contact Hackaday.io Give Feedback Terms of Use Privacy Policy Hackaday API

© 2020 Hackaday