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Coin Cell Challenge Entries

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

Thermal Coaster

Ray OlsenRay Olsen

4.3k
46
42
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

49.2k
320
310
Low power Arduino based (smart)watch
Project Owner Contributor

Chronio

Max.KMax.K

687
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

21.3k
127
80
nRF52 Mesh of sensors, custom and standard protocols all lead to MQTT Gateways on Raspberry Pi with database and dashboard.
Project Owner Contributor

Home Smart Mesh

WassimWassim

318
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

1.7k
9
23
An annoying, tiny, rickrolling friend
Project Owner Contributor

ATtiny10 rickroller

shlonkinshlonkin

4.7k
34
40
Just a simple compact tetris clone using an ATTINY85 and a cheap OLED display.
Project Owner Contributor

pockeTETRIS

dombeefdombeef

3.3k
30
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

6.2k
81
94
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

469
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

84
0
0
My twist on the classic LED Dice kit. Yes, I resort to cheating to beat the kids!
Project Owner Contributor

Cheater Dice

NASCONASCO

15.9k
185
171
A handheld game console programmable with (Micro/Circuit)Python.
Project Owner Contributor

µGame

deshipudeshipu

136
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

7.5k
58
54
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

jaromir.sukubajaromir.sukuba

12.7k
620
82
wearable UV Index & weather sensor
Project Owner Contributor

UV-badge

x-labzx-labz

193
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

318
2
2
Hateful electrons with fearless mosfets join forces against elements
Project Owner Contributor

picoSTING

Robert MatejaRobert Mateja

443
4
2
A battery powered, periodic infrared beacon for a geocaching puzzle
Project Owner Contributor

Low power IR beacon

piotrb5e3piotrb5e3

16.1k
101
80
Starting a car with a CR2477 coin cell
Project Owner Contributor

Coin Cell Jump Starter

Ted YapoTed Yapo

407
3
4
Coin Battery Powered Open Fridge Alarm.
Project Owner Contributor

Open Fridge Alarm

mariusz_nowak_engmariusz_nowak_eng

3.3k
11
25
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

603
15
22
Collection of blink SMD soldering kits
Project Owner Contributor

Blink Coin cell toys collection

bobriciusbobricius

1.1k
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

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