NoticeDifference between revisions of "MQ - 2 Gas Sensor Brick"
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==Demo== | ==Demo== | ||
| + | Connect S port of electronic brick of gas sensor to A0 port of Arduino board, and we will use the following program to read the analog value. When the analog value exceeds the threshold, LED lamp will flash. | ||
| + | |||
| + | const int ledPin = 13; // the number of the LED pin | ||
| + | const int thresholdvalue=400; //The threshold to turn the led on | ||
| + | void setup() { | ||
| + | pinMode(ledPin, OUTPUT); | ||
| + | } | ||
| + | void loop() { | ||
| + | int sensorValue = analogRead(A0); //use A0 to read the electrical signal | ||
| + | if(sensorValue>thresholdvalue) | ||
| + | digitalWrite(ledPin,HIGH); //if the value read from A0 is larger than 400,then light the LED | ||
| + | delay(200); | ||
| + | digitalWrite(ledPin,LOW); | ||
| + | } | ||
==Download== | ==Download== | ||
==Useful Links== | ==Useful Links== | ||
Revision as of 07:13, 27 May 2014
Contents
Overview
The electronic brick of gas sensor can be used in fire protection systems to detect hydrogen, isobutane, liquefied petroleum gas, methane, carbon monoxide, alcohol, smoke, propane and other harmful gases.
Features
1. Plug and play, easy to use. Compatible with the mainstream 2.54 interfaces and 4-Pin Grove interfaces in the market.
2. With use of M4 standard fixed holes, compatible with M4-standard kits such as Lego and Makeblock.
Specifications
| PCB size | 33.0mm X 14.0mm X 1.6mm |
| Working voltage | 5V DC |
| Operating voltage | 5V DC |
| Compatible interfaces | 2.54 3-pin interface and 4-pin Grove interface(1) |
Note 1: S for analog output port, V and G for voltage at the common collector and ground respectively
Electrical Characteristics
| Parameter | Min. | Typical | Max. | Unit |
| Working voltage | 4.5 | 5 | 5.5 | VDC |
| Analog output voltage（VCC=5V） | 0 | - | 5 | V |
| Working current（VCC=5V） | - | 122 | - | mA |
The sensitive characteristics of MQ-2 to various gases
Demo
Connect S port of electronic brick of gas sensor to A0 port of Arduino board, and we will use the following program to read the analog value. When the analog value exceeds the threshold, LED lamp will flash.
const int ledPin = 13; // the number of the LED pin
const int thresholdvalue=400; //The threshold to turn the led on
void setup() {
pinMode(ledPin, OUTPUT);
}
void loop() {
int sensorValue = analogRead(A0); //use A0 to read the electrical signal
if(sensorValue>thresholdvalue)
digitalWrite(ledPin,HIGH); //if the value read from A0 is larger than 400,then light the LED
delay(200);
digitalWrite(ledPin,LOW);
}
