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Arduino powered liquid/powder dispenser system

Posted on May 5, 2015 by R-B 2 comments

An accurate dispenser system for liquids and powder using Arduino. First things first, let’s put together the interface. It will make some of the calibration steps later a little easier. Starting with the LCD screen, and associated potentiometer dial (put on the pump circuit board), wire up a breadboard according to the diagram above. The potentiometer is only there to control the contrast on the screen, so it doesn’t need to be on the front panel, cramping the rest of the interface. Next comes the buttons. The two little button were salvaged from the scale circuit board, so you can

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.

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