Basic tutorial of how to setup a flame sensor with the Raspberry Pi.
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Step 1: Parts
Step 2: Setup
VCC -> 5V
GND -> GND
DO -> GPIO 21
Step 3: Code
1. Upload script to Raspberry Pi
2. Type "python flame.py" to run script
Step 4: Additional Info
Online Guide: https://www.piddlerintheroot.com/flame-sensor/