I smartened up a lamp for pocket change.

Let’s say you want to blink an LED. You might grab an Arduino and run the Blink sketch, or you might lace up a few components to a 555. But you needn’t go so fancy! [The Design Graveyard] explains how ...

Abstract: This paper involves designing and developing a low-cost, portable pulse oximeter using an Arduino Pro Mini and a set of basic electronic components. The pulse oximeter will measure the ...

Abstract: This paper describes a low-cost security system for investigating the removal of an external object, for example, a watch or chain of a probe. When the object is disconnected, the circuit ...

In this article, we will see how to import a third-party model with QSPICE. The first operation is to have the model of the desired component available in textual format. Typically, their declaration ...

This Arduino-based night security light can protect your home/office from thieves/intruders at night. The light glows when movement is detected in front of the PIR sensor. Simultaneously, a piezo ...

The adventure of microphone preamps began for me at the beginning of the 80s. At first, it was with classic BC547 & cie style transistors. One day while reading "Audio hanbook by National ...

Normally exhaust fans installed in kitchens, including restaurant kitchens, keep running continuously—whether smoke is present or not. Here is how you can build a small electronic device that switches ...

This repository shows how to build a NMEA2000 WiFi Gateway with AIS multiplexing and voltage/temperature alarms. The ESP32 in this project is an ESP32 NODE MCU from AzDelivery. Pin layout for other ...