Description

MDB ESP32 Cashless Device (Mini, 0402)

Multi-Drop Bus (MDB) Vending Machine Telemetry and Payment Module (Mini 0402)

This is an open source project dedicated to implementing the MDB (Multi-Drop Bus) protocol for cashless vending machines, using ESP32 as the main platform and KiCad for PCB design. The MDB protocol is widely used in vending machines for communication between devices, enabling integration with cashless payment systems.

I2C bus for expansion and peripheral integration

Pulse I/O interface for compatibility with traditional coin/bill systems

Addressable RGB LED for real-time visual status indication (e.g., connectivity, errors, transactions)

This project is part of the VMFlow ecosystem, aiming to standardize and simplify the development of modern, connected vending solutions.

GitHub

https://github.com/nodestark/mdb-esp32-cashless

Youtube

https://www.youtube.com/shorts/wKaXX6SeWW8

VMflow

https://vmflow.xyz

Google Play

https://play.google.com/store/apps/details?id=xyz.vmflow.target

Schematic and Layout

schematic-mdb-slave-esp32s3-mini.pdf

Download Gerbers Download BOM(Bill of materials)

Sep 17,2026

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MDB ESP32 Cashless Device (Mini, 0402)

ESP32 cashless + telemetry module: MDB payments and EVA DTS DEX/DDCMP via Bluetooth/MQTT

Published: Sep 17,2026

Standard PCB

Download Gerber file 0

BOM(Bill of materials)

Centroid file

PCBWay Donate 10% cost To Author

Only PCB

PCB+Assembly

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Project images are for reference only. Actual production is based on the manufacturing files on the project page. Please review the designer's notes (e.g., PCB thickness) and select the appropriate options. PCBWay is not responsible for issues caused by unsuitable parameter selections.
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