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Coin Cell Challenge Entries

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99 projects
2.2k
14
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

338
181
6
.........Security hacker....... Ethical hacking how to secure my computer
Project Owner Contributor

Computer Hacking

ahmednaseruddinmoizahmednaseruddinmoiz

377
3
4
Coin Battery Powered Open Fridge Alarm.
Project Owner Contributor

Open Fridge Alarm

mariusz_nowak_engmariusz_nowak_eng

230
1
1
A small circuit inside an enclosure, both optimized to resist a hit to the ground
Project Owner Contributor

Airsoft sonic grenade

EduardEduard

1.8k
20
22
A posable micro-spawn of NoodleFeet that beeps and judges you <3
Project Owner Contributor

Noodle Spawnling

Sarah PetkusSarah Petkus

4.9k
187
45
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

3.1k
49
41
Low Power Temperature/Humidity Monitoring
Project Owner Contributor

Gecko Node - Wireless Low Power Sensor

Max.KMax.K

384
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

219
1
0
Small and cheap LED lights that turn on when its dark. Powered by a coin cell battery.
Project Owner Contributor

Tiny moon lights

Prof. FartsparkleProf. Fartsparkle

121
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

296
2
2
Hateful electrons with fearless mosfets join forces against elements
Project Owner Contributor

picoSTING

Robert MatejaRobert Mateja

298
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

3.2k
39
41
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

629
6
6
Lorentz dreams about metal horses
Project Owner Contributor

pic-o-matic

Robert MatejaRobert Mateja

875
22
26
I guess I can't stop doing badges. Really love the @pimoroni #bearables - but they don't have sloths :(
Project Owner Contributor

sloth badge

davedarkodavedarko

175
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

1.1k
5
17
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

735
141
3
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

12.9k
74
55
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

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

2.4k
14
11
Thermometer, stopwatch, step mash tool, boiling and hop additions controller in a compact instrument !
Project Owner Contributor

BrewBuddy

Marcelo BarrosMarcelo Barros

13.9k
63
78
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

3.5k
43
41
A credit card size Wireless Temperature & Humidity Node power by CR2032 Coin Cell
Project Owner Contributor

Wireless Temperature & Humidity Card

Will WhangWill Whang

18.7k
191
147
Multi-year always-on LED replacements for gaseous tritium light sources
Project Owner Contributor

TritiLED

Ted YapoTed Yapo

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