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DC millivolt source

Posted on May 5, 2015 by R-B One comment

Dilshan’s new project is a DIY millivolt source for simulating precise low-amplitude DC voltages. DC millivolt sources are often used for thermocouple simulations, DMM, ADC and analog circuit calibrations and fault findings, etc. Most of the DC millivolt circuits are based on expensive (and sometimes hard to find) operation amplifier like OP7, LT1077, etc. In this article we introduce low cost DC millivolt source based on commonly available LM308 precision operational amplifier, ICL8069 low voltage reference and 78L05 voltage regulator ICs. This millivolt source is design to obtain 200mV – 700mV DC output with 100Ω impedance. At the time of

Wireless reset button for your router

Posted on May 4, 2015 by R-B One comment

Does your router go wonky once every few days and require manual resetting? I know my old router did that quite a bit. Taylor Burley writes about his wireless reset button that will allow you to reset your router and modem from any room with just a click of the button. A 555 timer in monostable mode and a hacked door bell were the only things really needed to build this reset. Keep in mind that since I used a powerstrip this device can be adapted to any ac device, within the limits of the relay. I tried to make this project

MSP430 powered IR remote control for room automation

Posted on May 4, 2015 by R-B Leave a comment

Rohit Gupta writes about his MSP430 powered IR remote control that he uses for room automation to control a mosquito repeller and a RGB mood light in his room using a Sony TV remote. Buzz..Buzzzz..buzzzzzzzz .. That is how a lone mosquito irritates you in the middle of the night trying to convince you that his lullaby is helpful. Insignificant or not, But truly that is the underlying inspiration for this project. The Mosquito repellents have this obnoxious smell that I would not like to sleep in and these loner mosquitoes who just piss me off by buzzing in the

Yet another GPS tracker

Posted on May 2, 2015 by R-B Leave a comment

Here is another GPS tracker using Arduino that is aimed to assist people suffering from Alzheimer and Dementia by notifying their caretakers about their location. It consists of a GPS module, GSM module, Arduino and batteries all enclosed in a 3D printed case. When the GPS module is not within a user-specified boundary, the device will send a text message alert.

DIY GPS navigation using Arduino

Posted on April 29, 2015 by R-B One comment

This DIY GPS navigation system is built under $25 and uses Arduino with a GPS module and a 320*240 TFT to display the topographical maps stored as BMP files on an SD card. Based on the combination of TFT module and Arduino UNO fram Banggood and the GPS module from the same supplier I built a basic GPS navigation system that uses the topographical maps of The Netherlands (top25raster). In total there are 304 bmp files on an SD card, so the images are very detailed! In principle any 8 bit bmp map can be used. The maps were obtained from www.kadaster.nl,

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