Connect your iPad/PC to your Celestron NexStar SLT Telescope and control it with an astronomy app, like SkySafari Pro, K-Stars, or Stellarium I used an ESP32 dev module and a 3.3V TTL to RS232 level ...

Uses the HC-SR04 ultrasonic distance sensor to measure the salt level in the brine tank. The level is published to an MQTT broker configured in the menuconfig. To get accurate measurements of the echo ...

But with some soldering skills and a bit of hardware, you can build your own professional-level audio equipment around an ESP32 and impress almost any dedicated audiophile. The list of features ...