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Arduino Sketch for ESP32 controller for unlock by SMS project

[ esp32 microcontroller arduino electronics ]

There is a list of secret codes hardcoded into ESP32 controller. When user buy an item, the system (another one) send him one of the codes. User enters the code by 16-buttons keyboard. The controller checks the code exists and not used yet, then unlock an item from the stack for the user. It uses the relay.

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I used wokwi online service and Arduino IDE.

Here is the Source code.