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Coin Cell Challenge Entries

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97 projects
465
464
1
A keychain sized gamer based on the attiny85 and a single coin cell battery.
Project Owner Contributor

TinyPong

saulSaul

1.4k
6
7
This is a 3d printed mini led lamp ran on a 3v coin battery.
Project Owner Contributor

3v coin powered Articulated Mini Lamp

odddavisOddDavis

10.5k
34
39
A pranking device to annoy your friends... or perhaps an entire college campus.
Project Owner Contributor

ATTiny Low Power Prank

joseph-primmerJoseph Primmer

1.4k
10
4
Allows you to convert a binary code into a ternary, and also a trinary code to convert to binary.
Project Owner Contributor

Decoder of the ternary system

ternarysystemTernarySystem

322
6
12
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

4.3k
51
47
A credit card size Wireless Temperature & Humidity Node power by CR2032 Coin Cell
Project Owner Contributor

Wireless Temperature & Humidity Card

will-whangWill Whang

1.3k
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

1.2k
7
7
A quite persistent little blinker
Project Owner Contributor

Blinky_40

robert-matejaRobert Mateja

568
1
1
MAX32625PICO can be operated by a coin cell battery, opening up a variety of applications.
Project Owner Contributor

Coin Cell Operated Pico Board

naing-ye-aungNaing Ye Aung

4.4k
42
41
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

911
7
4
ESP8266 + Coin Cell + Match Box = Dash Button
Project Owner Contributor

Match Box ESP Dash Button

hagen-fritschHagen Fritsch

7.4k
62
53
A low cost ultra-low-power small-sized high accuracy temperature logger for use in scientific research.
Project Owner Contributor

Low-cost/power/size temperature logger

nikosNikos

70k
427
416
Low power Arduino based (smart)watch
Project Owner Contributor

Chronio

maxkMax.K

780
8
7
Lorentz dreams about metal horses
Project Owner Contributor

pic-o-matic

robert-matejaRobert Mateja

3.1k
18
13
Thermometer, stopwatch, step mash tool, boiling and hop additions controller in a compact instrument !
Project Owner Contributor

BrewBuddy

marcelo-barrosMarcelo Barros

653
4
2
A small circuit inside an enclosure, both optimized to resist a hit to the ground
Project Owner Contributor

Airsoft sonic grenade

eduardEduard

10.6k
60
57
If you have a lot of time, you can decide your position on Earth just using watches and eyes. Or RTC and LDR.
Project Owner Contributor

Light level geolocator

jaromirsukubajaromir.sukuba

578
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

8.6k
48
42
Wait overnight and do your welding job!
Project Owner Contributor

Coin cell battery powered spot welder

jaromirsukubajaromir.sukuba

9.9k
120
116
A Wordwatch using a 11x10 charlieplex matrix.
Project Owner Contributor

Word Wristwatch

cfCF

234
3
4
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

6.7k
81
65
Low Power Temperature/Humidity Monitoring
Project Owner Contributor

Gecko Node - Wireless Low Power Sensor

maxkMax.K

1.2k
5
9
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

2.3k
21
25
Atmel Attiny 85 + 6/4 RGB LEDs + analog sensor + battery 3v
Project Owner Contributor

Reactive Jeweleries

maxim-krentovskiyMaxim Krentovskiy

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