Track My Order
Frequently Asked Questions
International Shipping Info
Mon-Fri, 9am to 12pm and
1pm to 5pm U.S. Mountain Time:
Chat With Us
images are CC BY-NC-SA 3.0
added to your
Description: Simple breakout board for the MQ - 3, MQ - 4 and MQ - 6 gas sensors. All you need is VCC at 5V, GND, and a resistor to an ADC, that is it.
Note: This is the PCB only. Sensors listed below.
Dimensions: 16.8mm diameter
Added to your cart!
Heart rate data can be really useful whether you're designing an exercise routine, studying your activity or anxiety levels o…
This alcohol sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It ha…
This is a simple-to-use [compressed natural gas (CNG)](http://en.wikipedia.org/wiki/Compressed_natural_gas) sensor, suitable …
This is a simple-to-use [hydrogen gas](http://en.wikipedia.org/wiki/Hydrogen_gas) sensor, suitable for sensing hydrogen conce…
This is a simple-to-use [liquefied petroleum gas (LPG)](http://en.wikipedia.org/wiki/Liquefied_petroleum_gas) sensor, suitabl…
The STA540 from STMicro is a 4-channel, [class AB](http://en.wikipedia.org/wiki/Electronic_amplifier#Class_B_and_AB) audio am…
This is a simple-to-use [Carbon Monoxide (CO)](http://en.wikipedia.org/wiki/Carbon_monoxide) sensor, suitable for sensing CO …
This is a very small light sensor. A photocell changes (also called a [photodetector](http://en.wikipedia.org/wiki/Photodetec…
The RHT03 (also known by DHT-22) is a low cost humidity and temperature sensor with a single wire digital interface. The sens…
A row of headers - break to fit. 40 pins that can be cut to any size. Used with custom PCBs or general custom headers.
Resistors are a good thing, in fact, they're actually crucial in a lot of circuit designs. The only problem seems to be that …
At SparkFun we use many Arduinos and we're always looking for the simplest, most stable one. Each board is a bit different an…
This is the same temperature sensor that is included in our [SparkFun Inventor's Kit](http://www.sparkfun.com/products/12060)…
This sealed digital temperature probe lets you precisely measure temperatures in wet environments with a simple 1-Wire interf…
XBee radios are an awesome way to add wireless capability to your Arduino project and now it's even easier with the SparkFun …
This is the new Arduino Uno R3. In addition to all the features of the previous board, the Uno now uses an ATmega16U2 instead…
This is your tried and true white solderless breadboard. It has 2 power buses, 10 columns, and 30 rows - a total of 400 tie i…
The SparkFun Soil Moisture Sensor is a simple breakout for measuring the moisture in soil and similar materials. The soil moi…
Sharp's GP2Y1010AU0F is an optical air quality sensor, designed to sense dust particles. An infrared emitting diode and a pho…
It's blue! It's thin! It's the Arduino Pro Mini! SparkFun's minimal design approach to Arduino. This is a 5V Arduino running …
This is a force sensitive resistor with a round, 0.5" diameter, sensing area. This FSR will vary its resistance depending on …
If you've ever tried to connect a 3.3V device to a 5V system, you know what a challenge it can be. The SparkFun bi-directiona…
These headers are made to work with the Arduino Main Board, Arduino Pro, and the Arduino Mega. They are the perfect height fo…
Ready to add audio to your next project? This small breakout board couples a small electret microphone with a 100x opamp to a…
Hello, I’ve read about gas sensors that for them to work properly over an extended period of time, the voltage provided needs to be cycled constantly within a certain range.
However, I’ve seen nothing about that in these comments / diagrams / code examples.
Does anyone know more about this? Thanks!
Use the SF Gas Sensor Breakout Board. The MQ-6 label should be oriented as shown in the picture of the breakout board board (to the left when looking at the bottom of the breakout board). Connect (GND TO Ground), (A1 TO +5V), (H1 TO +5V; heater) and [B1 TO (10kohm load resistor to ground) AND B1 TO (Analog pin)]. In effect you measure the difference between A1 and B1.
I made this wiring you say here but my sensor is getting hot and I start getting 660 and dropping until around 120. Does it mean that it’s working? Thank you.
Hi everyone. When interfaced with UNO it gives values continuously decreasing from 1023 to down below.
H1 & A1 - 5v;
B1 - 10k to GND (read it from top to Anlog0);
Hi everyone. Just managed to get a proper connection scheme for this thing. So here you go:
(GND TO Ground), (A1 TO +5V), (H1 TO +5V) and [B1 TO (10kohm to ground) AND TO (Analog pin)].
Works for me. Tried it with…perfume :D
I tested the board with a multimeter’s buzzer and found that both As are connected together and both Bs are connected together (see the datasheet for As and Bs). So all you need is:
H1 -> 5V, A1 -> 5V, GND -> GND, B1 -> Microcontroller’s input
It would be great if you guys could carry a gas sensor socket, like this one.
i am trying to use this with the MQ-7 and can’t figure out the orientation. does the side with Mq-7 sticker align with the “Gas Sensor” print on the breakout board? I tried looking for a wiring diagram on the MQ-7 but couldn’t find a good response
Has anyone figured out this breakout board wiring? All the comments below seem to be contradicting one another at various points.
My guess so far is this:
I purchased two and have not soldered the second to the breakout board as I am stil unsure as to how the four pins should be hooked up. Any and all assistance is appreciated.
no, wrong. H is for heater, you need to supply 5v to heater. you will measure the difference between the signals on A1 and B1. give A1 a 5v, and measure the drop to B1. B1 needs a load (10k ohm resistor to gnd). measure the voltage on top of that load. A1 and B1 are interchangeable. as in you could supply 5v to B1, and measure the voltage drop across a 10k ohm resistor connected from A1 to gnd.
So whats the wiring diagram for this?!? Theres a wiring diagram for the sensor, but this thing has only 4 pins…
The pololu.com sensor mount seems more practical. Can Sparkfun come up with another design more easily mounted?
Quick question to SF or anyone who has one of these:
What is the pin spacing of the 4 holes? (where the wires attach in the picture) Is it a standard .1", able to be mounted on a circuit board? Also, what is the diameter of the hole in the center?
A dimensional drawing would help tremendously. (IMHO)
That is what I’m wondering too
The Eagle files were posted - should be able to measure accurately from there. For those not able to open the Eagle files, using this image as a reference:
X = 0.5"
Y = 0.1"
D = 3mm
Check out the eagle files. The best way to get a complete dimensional is to download the free version of eagle and check the files posted.
You might want to just look at the datasheet of any of the sensors, they have full dimensional drawings in them.
I don’t mean the sensor pins, but the other 4 (gnd, A1, B1, H1).
Still two dimensions left. Anyone?
I’ll get the eagle files posted, which will be the exact dimensions for all the holes.
There is 6 pin in but just 4 pin out. I just tought that 3 of the sensor pin are connected together at pin output H1 but the internal connection like as below
H one to GND
H other to H1
A one to A1
A second not connected
B one to B1
B second not connected
But other A should be at 5V
and other B should be at GND with 10K by the wiring refer.
could some one tell me the solution? The sensor should be hot for having efficient data. and the best wiring connection was given at above.
The connection on below should be pulled down at B to GND?
Could definitely use a schematic of this breakout board in use. I tried a lot of diff possible ways and while I got one to show me something in the serial output the sensor was getting hot and I am sure that is wrong.
Ignore the “A or B” label. How ever you hook it up, you measure from one side to the other. From A to B, or from B to A.
The sensor is supposed to get hot.
Hi - I am still a little confused by this. I gather H1 should be connected to +5v, and that GND goes to ground.
What do A1 and A2 connect to? I assume one to a ADC pin, and the other through a resistor to GND, but can’t seem to get it to work.
It would be helpful if the diagram/schematic showed a sample connection.
Three days later:
Now that I’ve actually received them, however, the boards are not the same as imaged - but are correctly labeled and wired. The terminals are, on the boards I’ve received, labeled B1 and A1 and are properly connected to the sensor pins.
The photos here are of an incorrectly wired board, surely an earlier version. The original poster was correct, but the shipped boards are fine.
What confuses this matter is the document, which shows the part in three drawings of two orientations; only one of the three drawings, the top one with the heater pins horizontal, is electrically and physically correct. I think the original board layout fell victim to misleading documentation.
This is indeed the case, as I pointed this issue out in Dec ‘08 and had the boards I purchased refunded. They scrapped their remaining stock and ordered new ones, but it would seem that they never updated the pictures.
Actually, the board appears to be fine. The silkscreening is just misleading; A1/A2 should be A/B.
The photos show both sides, flipped vertically. I believe you’ll see that the connections are correct.
I think this is wired incorrectly- the datasheet for the alcohol sensors states that you need to measure between one of the ‘B’ terminals, and one of the ‘A’ terminals. On the board, it looks like you are bringing out the connections for A1 and A2, which is reasonably usesless, as they are connected together in the part.
Based on 2 ratings:
about 7 months ago
Just another example of sparkfun making necessities available.
Took some reading to figure out how to hook it up and use it.
about 6 months ago
by Member #735566
The MQ-7 Carbon monoxide sensor?
Forgot your password?
No account? Register one!