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Category Archives: Arduino

DIY Spectrophotometer using Arduino

Posted on April 21, 2015 by R-B Leave a comment

Spectrophotometery is a quantitative measurement of the transmission properties of a chemical substance as a function of wavelength, and the device used for this purpose is known as Spectrophotometer. It operates by passing a beam of light through a sample and measuring the intensity of light reaching a detector through the sample. This Instructable describes an Arduino controlled DIY Spectrophotometer made by two undergraduate biochemistry students-Peter Elphick and Ed Tye, for their final-year lab project. We wanted to make a spectrophotometer that would measure the concentration of a dye called OPD; a common dye in biological assay kits. In addition to reading the absorbance of the

GPS based car locator

Posted on April 19, 2015 by R-B Leave a comment

Keep forgetting where you have parked your car in the parking lot? This Arduino-based car locator uses GPS to remember where you park with just the push of a button and later tells you how far you are from it and in what direction. The GPS continuously reads the latitude and longitude of the CarTracker. When the button is pressed, the coordinates are saved to the EEPROM. E.g., this would be the location of your car. Now, let’s say you walk out of a store and are looking for your car. Power up the CarTracker. Do not push button. The

RGB Graphic Equalizer driven by ESP8266

Posted on April 17, 2015 by R-B Leave a comment

Amir Avni has shared the details of his cool RGB graphic equalizer build, which is controlled by the ESP8266 hardware programmed with the NodeMCU firmware. The RGB LED strings are controlled through WS2812, while the equalizer colors are chosen through a Web interface over Wifi. Two weeks ago I got my ESP8266 Version 12, which is a new version of the ESP8266 micro-controller with more GPIOs, so it seems some nice things can be done with it. If you haven’t heard of the ESP8266 check this older postfrom the blog. Also, I got the MSGEQ7 chip, which is a chip that outputs an analog equalizer from

Introducing Easy Pulse Plugin: A breadboard friendly and Arduino/chipKIT compatible pulse sensor

Posted on April 15, 2015 by R-B 12 comments

Today we are happy to announce the release of a new addition to our Easy Pulse Sensor series named Easy Pulse Plugin. Like its predecessors, the original Easy Pulse and Easy Pulse V1.1, Easy Pulse Plugin also operates on the principle of Photoplethysmography, which is an optical technique of sensing blood volume changes in tissues by illuminating the skin surface with a light source and measuring the reflected or transmitted light using a photodetector. The photodetector output contains the cardiovascular pulse wave, which is synchronized with the beating of the heart. Easy Pulse Plugin provides all necessary instrumentation and amplification on

DAN64: A DIY 8-bit microcomputer using Arduino

Posted on April 7, 2015 by R-B Leave a comment

Juan J. Martínez’s DAN64 is a single board 8-bit microcomputer based on Arduino board and features a keyboard input, an output screen, and is able to load and run external programs. Current version of the project has the following features: Composite video black and white output, 256 x 192 resolution, 32 x 24 characters (8 x 8 pixels font, code page 437 character set). PS/2 keyboard support. 6502 virtual machine with system call interface to native code services. Linear 64KB memory access from the virtual machine (256 bytes page zero, 256 bytes hardware stack, 6144 bytes of video RAM and 58880

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