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Coin Cell Challenge Entries

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98 projects
3.2k
20
17
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

281
3
2
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

2.2k
18
23
Atmel Attiny 85 + 6/4 RGB LEDs + analog sensor + battery 3v
Project Owner Contributor

Reactive Jeweleries

Maxim KrentovskiyMaxim Krentovskiy

5.6k
730
49
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

3.6k
17
24
A clone of National Semiconductor's LM3909 IC using discrete components on a PCB.
Project Owner Contributor

Disintegrated LM3909 - 1.5V LED Flasher

Dillon NicholsDillon Nichols

201
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

973
436
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

cls-02cls-02

3.9k
45
43
A credit card size Wireless Temperature & Humidity Node power by CR2032 Coin Cell
Project Owner Contributor

Wireless Temperature & Humidity Card

Will WhangWill Whang

4.8k
51
44
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

1.6k
18
25
Small sized 555 timer based piano.
Project Owner Contributor

555 piano

Alexander RyzhkovAlexander Ryzhkov

53.9k
342
331
Low power Arduino based (smart)watch
Project Owner Contributor

Chronio

Max.KMax.K

530
3
2
Silicon Laboratories inc. sell MCU named Busy Bee, I decided to give it a try by transforming one in desperate firefly.
Project Owner Contributor

desperate firefly

JacquesJacques

5.9k
42
35
Wait overnight and do your welding job!
Project Owner Contributor

Coin cell battery powered spot welder

jaromir.sukubajaromir.sukuba

272
292
0
A keychain sized gamer based on the attiny85 and a single coin cell battery.
Project Owner Contributor

TinyPong

SaulSaul

489
5
5
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

18.1k
202
189
A handheld game console programmable with (Micro/Circuit)Python.
Project Owner Contributor

µGame

de∫hipude∫hipu

7.6k
17
10
This project describes the use of a coin cell for powering the Esp8266 by building a remote control for Phillips Hue Lights
Project Owner Contributor

Solved: Esp8266 powered by coin cell

GelstronicGelstronic

3.8k
34
31
Arcade games on the Micro:bit
Project Owner Contributor

Micro:Boy

de∫hipude∫hipu

349
252
2
A BCD binary clock that fits inside of a jar
Project Owner Contributor

Binary desk USB jar clock

Marius TaciucMarius Taciuc

705
4
4
How many screws can you drive with a CR2477?
Project Owner Contributor

Coin Cell Power Screwdriver

Ted YapoTed Yapo

726
5
3
ESP8266 + Coin Cell + Match Box = Dash Button
Project Owner Contributor

Match Box ESP Dash Button

Hagen FritschHagen Fritsch

1.6k
8
3
Call me Slow-on-the-Draw if you like, but I think there's a lot to be learned from this project even if it's a me-too.
Project Owner Contributor

Yet Another Fidget POV (YAFPOV)

doctekdoctek

20.2k
78
102
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

11.7k
119
111
badgy is a rechargeable coin cell powered ePaper display with WiFi connectivity
Project Owner Contributor

badgy

w4ilunw4ilun

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