Wiring MQ-2 Gas Sensor

[gmccarthy]

I'm looking at the code provided for this sensor and am a bit confused by this bit on the connections:

 * 
 *   A H A   >>> 5V
 *   B       >>> A0
 *   H       >>> GND
 *   B       >>> 10K ohm >>> GND
 * ```

What is A,H, B?
Shouldnt it be

Vcc -> 5V
Gnd -> Gnd
A0 -> A0
A0 -> 10k -> GND

[alexsh1]

Depends on your sensor.
It yours comes with the board http://www.ebay.co.uk/itm/MQ-Gas-Sensor-Carrier-board-for-MQ3-MQ2-MQ4-MQ5-MQ7-MQ9-MQ6-MQ8-MQ135-arduino-/171387108192?hash=item27e777bb60:g:fv8AAOSwW1ZTxKUz

you do not have to add anything.

[epierre]

@alexsh1 said:

Depends on your sensor.

you do not have to add anything.

yes and no, you don't have a datasheet for the board... 10K is 10K so you know it ;-)

[alexsh1]

@epierre said:

@alexsh1 said:

Depends on your sensor.

you do not have to add anything.

yes and no, you don't have a datasheet for the board... 10K is 10K so you know it ;-)

Actually, I have the datasheet for my board and this is adjustable resistor :)
Anyway, I got mine working without any additional 10k resistors. I hope it helps.