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How to use gas sensors with Arduino || Arduino tutorial

In this tutorial I’m demonstrating how to use MQ-2/MQ-5 gas sensors with Arduino. These little devices may be used in gas leakage detectors. The MQ-2 is suitable for detecting LPG, i-butane, propane, methane, hydrogen and even smoke. The MQ-5 detects LPG, natural gas and town gas.   Many other gas sensors can be used in exactly the same way, e.g. MQ-3, MQ-6 or MQ-135. Just read the datasheet, use the appropriate load resistor and experiment with the “sensorValue” in my Arduino code.  

Smoke & Gas Sensor for Electronics Projects- MQ2

This project uses an Arduino NANO and a Nokia 5110 LCD screen for measuring and displaying levels. It would may a nice and simple smoke detector or alarm project.   I think this might be a good sensor for home automation projects and many other uses. You only need one pin to accept the output from the sensor so it will fit nicely into many electronics projects.  

Thermistor for measuring/controlling temperature

All about thermistors for measuring and controlling temperature, including how to use the thermistor that’s in an automobile coolant temperature sensor. I talk about the difference between Positive Temperature Coefficient (PTC) thermistors and Negative Temperature Coefficient (NTC) thermistors. I talk briefly about my experiment to test if cold water boils faster than hot water and then talk about the effect of the thermistor’s changing resistance on the electrical current running through a PC fan, to turn the fan on and off. I go over the electrical circuit for it in detail, including the homemade power supply, thermistor, PC fan and…

A simple guide to electronic components.

A basic guide to identifying components and their functions for those who are new to electronics. This is a work in progress, and I welcome feedback from you guys on whether I should break it down into more manageable chunks. I’ve kept the maths to a minimum, since it can be off-putting to someone just getting started in electronics.   The idea of this video is to slot in some more of the jigsaw pieces involved in learning electronics, when you start to recognise components, but aren’t quite sure what they are or what they do. It’s tricky to squeeze…

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