I am back to student life. This question is about coursework and in that I have to interface a Grove MQ9 Gas sensor 1.4. Here is the link of it
In simplest terms, just accept analog signal into arduino and use it as a measure of gas concentration.
The datasheet of sensor describes the heater voltage of 5 volts for 60 seconds and then 1.4 volts for 90 seconds.
The module mentioned above, has four terminals, namely VCC, SIG, NC and GND. SIG is measured signal output, while VCC is tied to 5 volts. Seed studio has given interface code but does not mention anything about the heater voltage cycles? I am a bit lost, whether the sensor module has inbuilt circuit to perform 5v/1.4 volts cycle, I am not sure. Any comments on this are welcomed.
I was confused whether this is arduino question or general electronics, I thought it is general electronics and hence here.
Many thanks in advance