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Category Archives: Arduino

Automation of an old-school knob-turny style AC unit

Posted on June 13, 2015 by R-B One comment

If you have an old-school knob-turny style window AC unit that is still in working condition, you might want to read this article from Phil Rowe who talks about how he reinvigorated his old AC unit to a fully automated AC system using Arduino. He writes, This article covers the development of an Arduino controlled air conditioning system. It converts an old school, in-window, air conditioner (AC) which was in a very hard to reach spot to an automatic system which can be activated and monitored from MegunoLink Pro at your desk. The system consists of an Arduino Uno, a servo driven mechanism

How to use HC-SR04 ultrasonic ranging module

Posted on June 12, 2015 by R-B One comment

Samuel Alexander, a 10th grader from Surabaya, Indonesia, has posted an Instructable on how to use the HC-SR04 ultrasonic module with Arduino for simple distance ranging applications. HC-SR04 is a common choice among hobbyists for obstacle detecting in robotic applications, and his Instructable would be helpful for beginners to learn how to hook this ultrasonic ranging module in your Arduino project.

ATtiny85 based mini weather station

Posted on May 25, 2015 by R-B One comment

This Instructable describes a mini weather station using ATtiny85 and DHT11 sensor. It consists of TX and RX units with a 433MHz RF link to connect them. The TX unit sends temperature and humidity measurements to RF module, which then displays the data on an LCD. In a recent instructable Indigod0g described a mini weather station that works pretty well, using two Arduinos. Maybe not everyone wants to sacrifice 2 Arduinos to get humidity and temperature readings and I commented that it should be possible to do a similar function with two Attiny85’s. I guess talk is easy, so I better put

An open source chocometer to measure blood glucose level using IR light

Posted on May 25, 2015 by R-B 2 comments

marcelclaro’s entry to HAD Prize 2015 is an open source Chocometer that can measure the glucose level in blood by shining an infrared light source. Diabetes mellitus is a global problem, in 2013, 382 million people have diabetes worldwide, most with more than 45 years, and global economic cost in 2014 was estimated to be $612 billion USD.The future projections are not encouraging.All forms of diabetes increase the risk of long-term complications (cardiovascular disease, blindness, chronic kidney desease, etc.), however, the complications of diabetes are far less common and less severe in people who have well-managed blood sugar levels. Today, the diary glucose level

Arduino measures heart beat rate from fingertip

Posted on May 6, 2015 by R-B 33 comments

The PIC16F628A based heart rate meter is one of the most popular projects published on Embedded Lab. In this article, I am going to show how to replicate the same project using a simpler platform like Arduino. The Arduino heart rate meter will use Arduino Uno, Easy Pulse Plugin, and 4-digit SPI seven segment LED display module. It computes the heart beat rate by processing the analog pulse signal output from the Easy Pulse Plugin sensor and displays it on the seven segment display module. The heart beat rate is refreshed every ~3 sec.

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