Tag Archives: ATtiny25

ATTiny25 based tea timer


Michael @ acidbourbon.wordpress.com has built the “perfect” tea timer project. He wrote a post on his blog detailing its assembly:

Maybe you just drink coffee. Then this article is not particularly interesting for you. But if you like a cup of black or green tea once in a while you might know the problem: You prepare your tea and you let it stand for a minute too long. Then it is bitter. So the next time you use the timer functionality of your smartphone … unlock the screen, open the timer app, enter something like “3:00″ (minutes), press start, pour boiling water over the tea, wait. Then your phone beeps like crazy while you are fumbling around with the hot and wet teabag you want to dispose of. Finally you unlock your beeping phone with your wet fingers, open the timer app again and silence it. Pure stress.

ATTiny25 based tea timer – [Link]

Attiny25/45/85 police light with Arduino


Another Instructables by Jan Henrik, a police light with a Attiny25/45/85. He writes:

Hello, in this project I want to show you how to build a multi functional Police Light with a Attiny25/45/85 .

It will have several animations , which can be changed with a button on the circuit board, it has 2 channels, which can be controlled with PWM. That allows us to add serval animations or police light flashing sequences. The maximum rated current per channel is 500mA, that allows us to control high power LED´s, LED stripes or old Light Bulbs!


Attiny25/45/85 police light with Arduino – [Link]

The Tinusaur Project


Neven Boyanov @ open-electronics.org writes:

The Tinusaur is a small board with a ATtiny85 micro-controller on it. The board has the minimum required components for the micro-controller to work properly. It also has few headers to connect external components and connector for ISP programmer. The board could work with any of those DIP-8 chips such as ATtiny25/ATtiny45/ATtiny85, ATtiny13 as well as their variations.

The goal of the Tinusaur project is to have a simple, cheap and quick-start platform for everyone interested in learning and creating things.

The Tinusaur Project – [Link]

ATtiny25 Basic VCO, RC oscillator overclocking and testing frequency pickup


Alex over at InsideGadgets has posted an article describing how he built an ATtiny25 voltage controlled oscillator (VCO):

I recently bought a Rigol DS1052E and have been playing around with the different functionality it has. Eventually I came to the point that I’d like to see what frequency does to various components and wanted to build a voltage controller oscillator (VCO).


ATtiny25 Basic VCO, RC oscillator overclocking and testing frequency pickup – [Link]

AVR microcontroller based PWM fan controller


Zak Kemble build an AVR based PWM fan controller. He writes:

So this is a bit of a continuation on my 555 timer based PWM controllers, but now using microcontrollers and MOSFETs instead of 555 ICs and transistors. I made 2 versions, one with switches for speeding up and down and the other with a potentiometer like the previous controllers. I used ATtiny25 controllers running at 31.25KHz (8MHz internal RC / 256 prescaler) with a 3.3V supply, the MOSFETs I used are STP36NF06L with 0.045Rds and 2.5Vgs max, perfect for 3.3V, the MOSFETs only generate ~180mW of heat at 2A ((0.045Rds * (2A * 2)) = 0.18W) so no heatsink needed, you can barely feel them getting warm.

AVR microcontroller based PWM fan controller – [Link]

Full-Auto Rapidfire Mouse Modification

This is a simple project to add an intelligent rapid fire button to a mouse using a microcontroller (ATTiny25). Because the project is simple both in schematics and code (both posted), it’s a great example of how to attack a real life project with a microcontroller-based solution. Although other rapidfire button mods are out there (many involving 555 chips), this one is special because one press triggers it (no need to hold it down), and it fires (left-clicks) 25 times a second for exactly 5 seconds (the time it takes to fully unload a magazine in Counter-Strike Source!  The video shows all steps of the project, including programming the microcontroller, and even demonstrates practical usage of an oscilloscope! This is a fun project which may serve as inspiration for anyone just getting into microcontrollers.

Full-Auto Rapidfire Mouse Modification – [Link]

Tiny Proto Boards

These are two new prototyping boards based on ATtiny25 and ATtiny2313 Atmel microcontrollers. They include most of the standard components like a reset button, an ISP header and also they have a prototyping area to build your own circuit. Even a 3 AA cell battery holder with on/off switch is included in the kit. Check details on the link below.

Tiny Proto Boards – [Link]