Content for ULN2003

Arduino M&M Color Sorter

“Are you tired of sorting your m&ms by hand? Looking for a silly way to spend your time and 3D printer filament? Then this is the Instructable for you. This is a project that I built for one of …

3D Printed Earth Clock

“Few years ago, I invented and built a clock showing how the Earth is exposed to the sun in real time. The Earth Clock: I was happy with the result, however I am now an engineering student and I wanted …

Teaching Arduino to print telegrams

“A small project on Arduino that prints notifications coming to your phone: messages from various instant messengers, news from Twitter and everything else. Such a “telegraph apparatus” was conceived as an interesting toy without serious use, but, as it turned …

Lane Tech HS - Stepper Motor Spinning Spool Project

“I wanted to create a device that could spin spools of thread when I pressed a button so I could just cut the thread and continue sewing. Context I am a person who avidly pursues art projects and crafts, and …

Robot Arm with Smartphone Control BLE and Arduino

“Are you thinking about make an Android app for arm robot with BLE? With this project you can understand how to work BLE and control it. ARM Robot This type of robotic arm has been selected for its simplicity and …

Inspire 3D Printer

“The Inspire 3D Printer Kit is being developed by Accessible3D to be the cheapest 3D printer kit ever. Our current developer kit is being delivered for $30, and I am hoping to keep the price-point as close as possible to …

Project  CNC plotter

CNC plotter

“Gcode Controlled Drawing Plotter with Arduino I want to do a pen plotter. There are many plotter systems. I am doing it, the system that uses the belt. GRBL and Arduino CNC Machine Working Principle Overview The main parts I …

Water Level Indicator With Temporary Alarm & Water Flow Sensor

“There are many countries and people who depend on the water tank to get the water for their home as I am. In the lockdown, my dad keeps climbing the stairs to know the water level and to secure our …

10 Channel Wi-Fi Switch for Smart Home

“This device can help you automate your home, backyard, or whatever you want. To build this device, you’ll need: ESP8266 x1; 4-stage ripple (binary) counter (I can suggest SN74LS93N) x1; 14-stage ripple counter (CD4020BE is the best choice) x1 …

Synchronized 2-Axis Motion With Variable Speed (Arduino + LEDs + 28BYJ-48)

“This tutorial shows how to move two stepper motors so they will synchronously arrive at defined destination point. There are many sophisticated solutions for doing this such as GRBL or Marlin. Using an Arduino, there are also dedicated Multi Stepper …