Want to change the sound of your car's horn? Here's how it's done

There's more than one way to change the sound of your car's horn. One method involves a hardware swap. The other sees you ...
EDN

Design Ideas

A simple, low cost, and precision frequency meter uses only two pins of a pc parallel port (Figure 1). The TTL-level periodic input signal with frequency f IN connects to the ACK pin of LPT1. This ...
IEEE

On the Road to 6G: Visions, Requirements, Key Technologies, and Testbeds

Abstract: Fifth generation (5G) mobile communication systems have entered the stage of commercial deployment, providing users with new services, improved user experiences as well as a host of novel ...
GitHub

Singe Wire Half Duplex UART using two pins on arduino and esp32

Additional circuitry required. One Diode (I use 1n4004) - pole/cathode at tx pin other at rx pin. 4k7 Ohm resistor between rx and 5V (3.3V also works). Same at the other microcontroller but you don't ...