High-voltage FLASH programming on ATTINY85

ATTINY85 High-Voltage Flash programmer @ td0g.ca: The Atmel ATTINY85 is a great chip (cheap, easy to use, supported in the Arduino IDE). Unfortunately it only has 5 IO pins, which limits its usability. There are guides on using a High-Voltage Programmer (HVP) to change the Reset pin into an IO pin. However, that prevents you […]

ATTiny85 Pulse oximeter with photoplethysmogram (PPG) display

tinyPulsePPG, an ATTiny85 Pulse Oximeter with Photoplethysmogram (PPG) display by Jeff Magee: This project implemented on an ATTiny85 displays a moving Photoplethysmogram together with pulse rate and estimates of SpO2 – blood oxygen percentage. It uses an SSD1306 128×32 OLED display and a Max30102 sensor. It is emphasised that this should not be used for […]

DIY wireless temp/humid/pressure sensors for measuring vacuum sealed 3D printed filament containers

Scott M. Baker writes: I made some wireless sensors, using BME280 temperature, humidity, and pressure sensors, together with SYN115 transmitter modules. I used these to verify the storage of vacuum sealed “PrintDry” 3D filament storage containers. See the full post on his Scott M. Baker blog. Check out the video after the break.

Attiny wearable

Attiny wearable project from Facelesstech: It’s a foundation for a wearable platform. It’s a Nato watch strap threaded through a PCB with a coin cell battery holder between the PCB and the strap. I’m using a Attiny85 this time around but could be used for most chips/dev boards. This is a proof of concept to […]

Lightronome 1 – The light based metronome

Zoltán Gomori documented his lightronome build: I got a request, to design and build an electronic metronome. You can find several on the market, but the problem it is ether producing voice or the classical mechanical metronome. The requirement here was a visual effect. To be precise four LEDs for 4/4 beat. It is required for drumming […]

Arduino decision box BE (Attiny85)

nqtronix wrote this instructable detailing the build of his Arduino Decision ‘Box’ BE (Breadboard edition): Pleace notice: This project neither contains a box nor any Arduino* code. I stuck with this name because this project is a modifictaion of Victor8o5’s “Arduino decision box 2.0 (Attiny85)” posted three days ago. I liked the way it looks and works, […]

DIY fingerprint scanning garage door opener

Nodcah made this Instructables detailing the build of his DIY fingerprint scanning garage door opener: As a person without a car, I don’t need to carry keys around everywhere I go. Because of this, I’ve been locked out of my own house several times. It’s a pain to wait for someone with a key, so I thought I […]