Close

Coin Cell Challenge Entries

Learn more
99 projects
11k
107
102
badgy is a rechargeable coin cell powered ePaper display with WiFi connectivity
Project Owner Contributor

badgy

w4ilunw4ilun

487
487
5
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

7.2k
84
80
A Wordwatch using a 11x10 charlieplex matrix.
Project Owner Contributor

Word Wristwatch

CFCF

5.2k
383
47
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

295
1
1
1 Bite 4 results using sin in a coin
Project Owner Contributor

Volumetric parametre

Galasso David LeonardoGalasso David Leonardo

492
5
8
Touch controlled light-up PCB business card, no microcontroller required!
Project Owner Contributor

Analog Touch Control Business Card

SunnySunny

859
290
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

kristjan-komlosikristjan-komlosi

3.3k
33
31
Arcade games on the Micro:bit
Project Owner Contributor

Micro:Boy

deshipudeshipu

609
4
5
How many screws can you drive with a CR2477?
Project Owner Contributor

Coin Cell Power Screwdriver

Ted YapoTed Yapo

1.1k
11
12
A drink coaster which changes color based on a cups temperature
Project Owner Contributor

Thermal Coaster

Ray OlsenRay Olsen

3.9k
42
42
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

3.9k
68
68
whowhow. whowhow. - formally known as purple rider
Project Owner Contributor

K.I.T.T. - KNIGHT RIDER badge/brooch

davedarkodavedarko

15.7k
99
76
Starting a car with a CR2477 coin cell
Project Owner Contributor

Coin Cell Jump Starter

Ted YapoTed Yapo

3.1k
24
34
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

670
7
6
CR2032 Coin Cell LCD Projector. Digispark Attiny85 module, LCD panel harvested from ebay mp3 player.
Project Owner Contributor

Coin Cell LCD Projector

ChallengingStage888ChallengingStage888

2.7k
15
18
A clone of National Semiconductor's LM3909 IC using discrete components on a PCB.
Project Owner Contributor

Disintegrated LM3909 - 1.5V LED Flasher

DillonDillon

23.4k
112
76
This project using an ESP8266 to find the password of a WiFi access-point with PBC enabled.
Project Owner Contributor

WiFi cracker ESP8266(PBC)

Sagar NaikSagar Naik

426
3
6
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

182
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

406
4
2
A battery powered, periodic infrared beacon for a geocaching puzzle
Project Owner Contributor

Low power IR beacon

piotrb5e3piotrb5e3

1.3k
11
15
why stick to CR2032 when you can have a CR200320!! Powering your Anet A8 3D printer with a coincell
Project Owner Contributor

MegaCoinCell

megaCellmegaCell

680
6
9
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

471
3
4
A coin-cell powered ATTiny board with popular peripherals (USB, potmeter, slide/tact switch, piezo buzzer, LED) to jump-start tiny projects.
Project Owner Contributor

Duinothrowie

GregorGregor

3.2k
29
31
The Micro TV-B-Gone is based off of Adafruit's original TV-B-Gone kit, except made to be as small as possible, using an LIR-2032 coin cell.
Project Owner Contributor

Micro TV-B-Gone

Nicholas JunkerNicholas Junker

failed to load.

Going up?

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

© 2019 Hackaday