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This is one of my favorite parts right here. It's nice and complex looking, while not being detailed.
Here you can see the much smaller blue LED's used and the HEX Schmitt trigger.
It is a much more compact and efficient design.
The TTP223B capacitive touch sensor detects touch or proximity. It operates by measuring changes in capacitance when a conductive object, like a finger, approaches its surface. This sensor is commonly used in various electronic projects and can be interfaced with microcontrollers like Arduino to create touch-sensitive interfaces or control systems. In this tutorial, you will learn how to interface the TTP223B capacitive touch sensor switch with an Arduino Uno board. This guide includes all the necessary components, pin description, wiring connections, and Arduino code.
playwithcircuit.com/how-to-interface-ttp223b-touch-sensor...
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Tips to Place Home Sensor Cameras: Best Locations You Must Cover!
This is a photo of the first attempt at the senor board using a separate photo diode and IR LED feeding into a comparator.