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MQ3 Vending Machine

• About
• Getting Started
• Prerequisites
• Installation and Config
• Test
• Circuit
• Smartphone App
• Built Using
• Authors

This repo contains circuit, firmware and backend for MQ3 Vending Machine Project.

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

What things you need to install the software and how to install them.

- Raspberry Pi Model 3B, 3B+, 4B or CM4

A step by step series that covers how to get the Firmware running.

1. Download and install the latest Raspberry Pi OS Desktop image to your SD card
2. Open the terminal and execute the following command sudo raspi-config
3. Then follow the following pictures to enable I2C bus on you raspberry pi

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• Then do the same for Serial(UART)

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1. Copy Firmware folder to the desktop of your Raspberry Pi, open the terminal of your Raspberry Pi and execute the following commands

• sudo apt-get update
• sudo apt-get upgrade
• sudo apt install python3-pip
• sudo pip3 install gas-detection
• cd ~/Desktop/Firmware
• sudo chmod a+rx starter.sh

1. To run the program just double click on starter.sh file
2. or execute python3 /home/pi/Desktop/Firmware/Firmware.py

1. The Firmware can be tested on Raspberry Pi 3B, 3B+ or 4B with the following modifications
2. Connect the sensor as shown in the Circuit Diagram section below.

• RPi 3,4 GPIOs Pinout

1. Any Raspberry Pi (https://www.amazon.com/CanaKit-Raspberry-Micro-Supply-Listed/dp/B01C6FFNY4/ref=sr_1_1?dchild=1&keywords=raspberry+pi+3&qid=1632029848&sr=8-1)
2. MQ3 Sensor(https://www.amazon.com/ACROBOTIC-Alcohol-Breakout-Raspberry-Breathalyzer/dp/B07CSNGS87/ref=sr_1_5?dchild=1&keywords=mq3&qid=1632029867&sr=8-5)
3. MCP3008
4. Logic Level Converter(https://www.amazon.com/SparkFun-Logic-Level-Converter-Bi-Directional/dp/B01N30ZCW9/ref=sr_1_6?crid=2NOGIA43AG9OS&dchild=1&keywords=logic+level+converter&qid=1632029917&sprefix=logic+level%2Caps%2C463&sr=8-6)

• Python3 - Raspberry Pi FW
• Flutter - Cross-Platform Smartphone App Development Framework

• @Nauman3S - Development and Deployment