It seemed like a cool sensor, so I bought one to test out. It interfaces with an Arduino easy enough, connect 5vdc, ground, and then just analogread(pin) will give you a value.
Calibrating it is a bit more difficult as it uses the sensor and a resistor as a voltage divider, and every one could be different depending on the quality of the resistor used.
I found the digital pin pretty much useless for my purposes, but I can see where it would be useful. There's a small trim pot used to adjust the bias on the comparator, so you can set the threshold.
It's worth noting that the manufacturer of the sensor itself advises burning the unit in for 24 hours. I assume this is to burn in the heater element. It'll give some varying numbers until it's burnt in, and it always gives non-sense values for the first 2-5 minutes.
Outputs are typically:
Normal air returns approximately 100-150
Alcohol returns approximately 700
Butane returns approximately 750
| Manufacturer | HiLetgo |
|---|---|
| Part Number | 3-01-0198 |
| Item Weight | 0.798 ounces |
| Package Dimensions | 2.7 x 2.3 x 0.4 inches |
| Item model number | 3-01-0198 |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Batteries Included? | No |
| Batteries Required? | No |
