Arduino | Embedded Lab

Category Archives: Arduino

Etch-a-sketch on a VGA monitor using Arduino

Posted on December 9, 2016 by R-B Leave a comment

Kids love Etch-a-sketch drawing boards. Rob Cai shares on this Instructables post how he has built a Etch-a-sketch like drawing tool using Arduino Uno and a VGA monitor. Besides an Arduino board, this project only requires two potentiometers, two tact switches, and four resistors. The VGA signal is generated in software using the VGAX Arduino library contributed by smaffer. I used Arduino IDE 1.6.4. and the VGAx library done by Smaffer and publish on GitHub here. This library allows to use four color with a resolution of 120 x 60 pixels. One button is to clear the screen, the second to choose the color.

8-channel AC current data logger

Posted on December 8, 2016 by R-B Leave a comment

This Arduino-powered 8-channel data logger built by smooth_jamie can measure AC currents drawn by home appliances or other equipments, and record the data on an SD card with timestamp for future use. The project uses the HMCT103C 5A/5MA current transformer for sensing the current flowing through a conducting wire. The current transformer output signal is very low, and therefore, an OpAmp-based circuit is built for instrumentation. The analog output voltages corresponding to the eight-channel current logger are digitized using an external lADS1115 16-bit A/D converter IC. Hi Everyone, welcome to my first instructable! By day I am a test engineer for a company that supplies industrial heating equipment,

Serial seven segment LED display shield

Posted on December 6, 2016 by R-B 2 comments

Seven segment LED displays are brighter, more attractive, and provide a far viewing distance as well as a wider viewing angle compared to LCD displays. This project describes a serial seven segment LED display shield for Arduino Uno or compatible boards. The shield consists of eight 0.56″ seven segment displays that are driven by one MAX7219 chip. The shield also features a light dependent resistor (LDR) to implement adaptive brightness control to the LED displays. The LDR output can be fed to A0 or A1 analog input channel of Arduino to read the surrounding illumination level. Arduino can then use that

Minimalist ATtiny85 wrist watch

Posted on December 6, 2016 by R-B One comment

David Johnson-Davies’ minimalist ATtiny85 wrist watch displays time using 12 LEDs that are arranged in a circle like a watch dial. A push button, installed on the top side of the PCB, needs to be pressed to see time. The watch shows the hour by lighting up an LED and minute by flashing another LED. The minute resolution is 5 min. To show the time you press the button on the watch face, and the time is then displayed for four seconds. It lights one LED to show the hour, and flashes another LED to show the minutes to the nearest

Personal location tracker

Posted on December 1, 2016 by R-B Leave a comment

Tiobel‘s Track Me project describes a personal GPS tracker using an Arduino Mega along with a GPS module and a GPRS Shield. The GPS module finds its location using data from more than 3 satellites. In order to retrieve the location remotely, you need to call the number of the SIM card placed into the GPRS shield, and the system will send you back an SMS with the actual position and it’s link to the google maps.

« Older Entries Recent Entries »