1. Introduction

Vending machines and automated dispensers both need a simple, reliable way to confirm whether a container is actually sitting in place before releasing anything into it. In this experiment, a tilt-based presence module, sometimes sold as a Magic Cup Light module, is wired to the STM32F070RB as a digital input, and the microcontroller reports presence or absence over UART alongside an indicator LED.

2. Scope

This experiment covers reading a simple digital presence and absence sensor, and reporting clear, human-readable state changes over UART alongside a visual LED indicator. This reinforces the simple digital-sensor-reading pattern, applied to a placement-confirmation style sensor.

3. Prerequisite

3.1 Hardware

• STM32 Nucleo-F070RB development board

• Magic Cup Light module, or an equivalent tilt or proximity presence sensor

• LED and a 220 ohm resistor

• Breadboard and jumper wires

• Micro-USB cable

• PC with PuTTY

3.2 Software

• STM32CubeMX (standalone)

• STM32CubeIDE

• ST-LINK USB driver

• PuTTY, or an equivalent serial terminal application