Universeller Smart Switch

Universeller Smart Switch finished

Universal smart wall switch, my diploma thesis at HTL Rankweil in 2023, graded Sehr gut.

Thesis (PDF)
1 / 8Measuring the supply voltages on the development kit.
1 of 8
Two multimeters measuring voltages on the development kit
Measuring the supply voltages on the development kit.
Assembled switch board with an ESP32-S3 module and screw terminals
The switch board in its final form, with the ESP32-S3 module and the terminals for the load.
Round circuit board layout with dimensions
Layout of the switch board, shaped for an EU in-wall box.
Board layout of the development kit, version 1
The development kit we tested on.
Development kit with a microcontroller board mounted on it
The assembled development kit.
Schematic of the power supply from AC in to DC out
Schematic of the power supply.
Client app with the mode configuration of a switch
The client app, setting what a switch does.
Client app connected to the bridge
The client app connected to the bridge.
TeamJohannes Klapper and me
SchoolHTL Rankweil, 2023
GradeSehr gut
TechESP32-S3, BLE, Wi-Fi, C#, Python

My diploma thesis at HTL Rankweil, built together with Johannes Klapper and graded Sehr gut in 2023. The goal was a wall switch that fits into a normal EU in-wall box and still works like a switch you press, while it can also be controlled from another device. No cloud and no smart bulb.

The system has three parts. The switch itself switches the load and measures the temperature, with an ESP32-S3 for its Bluetooth Low Energy 5.2 stack. A bridge in the middle talks to the switches over BLE and to the network over Wi-Fi. A client app configures both and controls them.

The whole system works on our prototype setup and the final switch hardware exists in its intended form factor. We did not manage to bring the size-correct board fully into operation before the deadline. The complete write-up with the architecture is in the thesis PDF.

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