Chronio – an arduino smart watch that looks great


There are many attempts to build custom smart watches. Many of them have nice characteristics, but lack the finished look. If you are going to wear it, then design and feel is very important factor. Max.K introduced his 3D printed watch version. His design called Chronio is an Arduino based custom built watch featuring Atmega328p microcontroller, Real time clock DS3231, 96×96 pixel Sharp Memory display and is powered by CR2025 160mAh battery. The watch has overcome several revisions and already has a bunch of useful features that include efficient power saving that leads to 20uA power consumption, 3 button interface (no touch screen functionality), displays time, date, temperature and battery information on main screen. Other apps include stopwatch, experimental Flappy bird game. And additionally to that case fits standard 22mm … Continue reading

Arduino based FM radio with digital volume control


niq_ro have shared his Arduino based FM radio design on insrtuctable. TO catch FM waves he used TEA5767 FM chip which can be interfaced to Arduino via I2C interface. To adjust volume he used MCP4261-502E/P – dual digital potentiomer controlled via SPI on 8 bit steps. He made some effort to implement pretty nice interface on Nokia 5110 display. Here you can see the frequency of band, volume level, signal strength gauge. The only thing is left to do is to put everything in to enclosure.

Arduino based cellular automata

Arduino cellular automata

You have probably heard of Game of Life. It is popular cellular automata simulation game where you create simple structures in infinite plain and watch the life evolve. All this is achieved by implementing several basic rules. By implementing different rules, you can simulate biological processes, model structure behavior and program robot swarms. Building cellular automata is fairly simple. You can start with Arduino Nano and 128×64 OLED to get pretty interesting results. In this following project the Game of Life has been implemented. There are only two rules applied to pixels to make it work: 1. A cell which is dead and is surrounded by exactly 3 alive cells, will be born 2. A cell which is alive and has either 3 or 2 alive cells will remain alive, … Continue reading

Arduino based non contact infrared thermometer

Arduino infrared thermometer

In some cases you might want to measure temperature without touching object. One solution is to use infrared thermometer. You’ve probably seen one somewhere in hospital where nurses usually measure temperature of patient from distance. has been sponsored with couple parts needed to build a simple infrared thermometer. The key element here is MLX90614 IR temperature sensor, which has pretty good characteristics: measured temperature range from -70 to 380ºC accuracy of 0.5ºC (when measured between 0 and 50ºC) resolution of 0.02ºC IIC digital interface small size He built thermometer by using Arduino and Nokia 5110 LCD shield. Fun fact is if you point thermometer to your body it will show much lower temperature than it is inside body. Simple explanation to this is that skin temperature is lower ~ … Continue reading

Nixie tube based digital thermometer


It is always handy to have few digital thermometers around the house. You may want continuously monitor indoor and outdoor temperatures, Use it for specific needs, for instance when preparing food or regulating boiler water temperature. If you would like to check digital thermometer value from a distance, then you should go with bright display. You can always use large bright LED seven segment displays, but if you have few spare nixie tubes around, why not use them instead. Luca Dentella have build three digit Nixie tube digital thermometer based on Arduino. He has chosen 10K thermistor based temperature sensor which can be easily read through Arduino analog input. He wanted nixies to look even cooler, so he added RGB LEDs with WS2812 control chips underneath each tube. This way … Continue reading