This code is for an RFID door lock system using an Arduino. It reads the UID of the RFID card and compares it to a predefined ...

Understand the importance of using a freewheeling diode to prevent voltage spikes and ensure proper energy discharge in ...

The Economic Development Council invites youth ages 9-13 to participate in a seven-week online after-school course: Youth ...

In addition to being a runnable CLI tool, D2 can also be used to produce diagrams from Go programs. For examples, see ./docs/examples/lib. This blog post also demos a complete, runnable example of ...

The image below shows the Arduino circuit diagram for building a smart bin. As you can see it is very simple, it just has an ultrasonic sensor and a servo motor connected to the Arduino UNO, and the ...

Check out this interesting wideband AC millivoltmeter circuit from 1990. The simple design features 12 ranges, decent accuracy, 200 µV accuracy, and a frequency range from 20 Hz to more than 2 MHz.

Connect a 4k7 kΩ pull-up resistor between the 1-Wire data line and 5V power. Note this applies to the Arduino platform, for ESP32 and 8266 you'll need to adjust the resistor value accordingly. For ...