ULN2003A

The ULN2003A is an array of seven NPN Darlington transistors capable of 500 mA, 50 V output. It features common-cathode flyback diodes for switching inductive loads. It can come in PDIP, SOIC, SOP or TSSOP packaging.

Main Content

Ultrasonic Radar Can Detect Multiple Objects at Each Ping

“With a small modification of the ultrasonic sensor module, this radar can detect multiple objects at each ping. This radar can detect objects located at distances between 2 cm and 1 meter and displays the value of distance to the …

88888: the Electronic Smile Counter

“This project originated from a request of a friend. He asked me to build a so-called smile counter for their college dorm - a segmented display which can show a number. This number must increment every time someone pushed a button …

8 x 8 x 8 LED Cube Powered by an Arduino Mega

“This cube is easy to build with no circuit board and minimum external components; and it comes with a lot of animations and effects. This is the third and final project in a series to see how much LED cube …

Arduino based Milliohm Meter with LCD display

“A milliohm meter is a device used in determining the resistance of small resistors, PCB traces, motor coils, inductance coils, and transformer coils, or calculate things like the length of wires. It provides a resolution, not built into regular multimeters …

Flip-Clock smart alarm-clock

“The Flip-Clock is an old stylish, classic alarm clock with up to date features, such as automatic time adjustment, weather forecast, FM radio or Spotify playback. The device consists of three 3D printed flip digits, a PCB with integrated drivers …

Arduino Controlled RGB-LED-Lamp #phablabs

“Build your own RGB Lamp providing 3 bright light cones in red, green and blue (or other colors) which turn on and off in a row. The speed of the light show can be manually controlled by a turning knob …

Etch-A-Snap - The Raspberry Pi powered Etch-A-Sketch camera

“Etch-A-Snap is (probably) the worlds first Etch-A-Sketch Camera. Powered by a Raspberry Pi Zero (or Zero W) it snaps photos just like any other camera, but outputs them by drawing to an Pocket Etch-A-Sketch screen. Quite slowly. Photos are processed …

DIY Voice/Internet Controlled Home Automation and Monitoring Using ESP8266 and Google Home Mini

“After all the HOME AUTOMATION articles I have written from BLUETOOTH, IR, Local WIFI, Cloud i.e. the difficult ones, NOW comes the easiest but the most efficient HOME AUTOMATION solution. T his project needs less hardware, circuit unlike my …

Open Source Turtle Robot (OSTR)

” Robotics is the exciting intersection of a number of engineering fields including mechanical engineering, electrical engineering, and computer science. This project was designed as the basis for a two-day workshop for high school age students to introduce them to engineering …

DIY Cheapest Bluetooth Controlled Home Automation

“The basic is very simple… You need a bluetooth enable host device i.e. mobile,computer or anything!! For the sending of command to the circuit. We have used a bluetooth module(HC-05 “HANDS & LEGS OF THE CIRCUIT” ) for …