Category Archives: Arduino


Chronio: Another Arduino based wrist watch

Chronio is an Arduino-based 3D-printed wrist watch designed by Max.K. The watch fits in a 22mm watch strap and runs on a 160mAh button cell for several months. A 96×96 pixel Sharp Memory LCD is used for display. Besides telling time, you can play a simplified version of Flappy Bird on it. Features The ATmega is in Sleep mode for most of the time and only runs once a minute to update the time or if a button is pressed. This reduces the current consumption to 2uA. Sady the display needs a certain pulse every second, which requires a complicated

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Arduino ultrasonic radar

Dejan Nedelkovski from How To Mechatronics has a very nice tutorial about making an ultrasonic radar using Arduino and Processing platforms. The project requires an HC-SR04 ranging sensor module mounted on a servo motor to scan the surrounding. The Arduino board control the scan position, as well as receives the ranging sensor output. The received echo data is post-processed on a computer using a Processing-based application and the radar signature is displayed on the computer screen. See this radar in action in the following video.

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Rubidium standard real time clock for tracking local time dilation

According to General Relativity, we all experience finite amount of time dilation in our daily lives, depending upon our location, elevation, and velocity. At the speeds we travel at and the elevation we experience in everyday, time dilation is so small that it’s not detectable to us. But the high accuracy of atomic clocks have provided evidence for this effect even at our everyday speed. Cameron Meredith has shared an interesting project on Hackaday.io about using a rubidium atomic frequency standard to continuously track local time dilation effects relative to a reference GPS clock. This project uses a rubidium atomic frequency standard

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Arduino waveform generator

joekutz built an arduino waveform generator using a 8-bit resistor ladder DAC and can output sine, sawtooth, and triangular waveform with frequency ranging from 1 Hz to 30KHz. This is my arduino-based waveform generator using a 8-bit resistor ladder DAC. It runs with a sampling rate of 65536 Hz and can create any (whole-number) frequency from 1 Hz to 30ish KHz in sine-wave, sawtooth, triangle and different ratios of square wave. My generator produces an amplified signal and also a unamplified, high-quality signal. There is a LCD built in that shows the current frequency, and also a speaker. The LCD is

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DIY Bike GPS

This DIY bicycle GPS can convert any bike into smart bike by adding navigation support. This bike GPS connects to the user’s smartphone GPS via Bluetooth and receives the navigation data from a GPS application on the smartphone. The project uses an Arduino board and a Neopixel LED ring. The destination is set on the GPS application on the smartphone and the directions are shown on the LEDs. In this project, we will use a GPS application available on Android or IPhone, OsmAnd, a mapping application and navigation with access to free data OpenStreetMap. This application is available offline, that is to say

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