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--- amc2022:grouph:mq2 [2022/09/09 17:20] – gustavo001
+++ amc2022:grouph:mq2 [2023/01/05 14:38] (current) – external edit 127.0.0.1
@@ Line 14: / Line 14: @@
 MQ2 is a metal oxide semiconductor. It detects gasses based on the change of resistance of the sensing material when the gas comes in contact with the material, these are called Chemiresistors.
 {{ :amc2022:grouph:mq2_schematics.png?nolink&600 |}}
-**//  Figure 1.//** MQ2 Sensor Schematics. Source: https://www.mouser.com/datasheet/2/321/605-00008-MQ-2-Datasheet-370464.pdf/}}
+**//  Figure 2.1//** MQ2 Sensor Schematics. Source: https://www.mouser.com/datasheet/2/321/605-00008-MQ-2-Datasheet-370464.pdf/}}
@@ Line 39: / Line 39: @@
 ====Structure:====
-The structure of the sensor is important since we are talking about measuring volatile gasses, and that its done with a heated component, we don't want to ignite the gas, for that reason the covering of the sensor which is a stainless steel mesh prevents that from happening. In addition it prevents large particles from entering and clogging the sensor. The device can both detect a gas but also measure its concentration, for our purposes we want to measure it. Furthermore, as illustrated in Figure #, the actual sensing unit is placed in suspension, this is to make sure the sensor is reading passing air.
+The structure of the sensor is important since we are talking about measuring volatile gasses, and that its done with a heated component, we don't want to ignite the gas, for that reason the covering of the sensor which is a stainless steel mesh prevents that from happening. In addition it prevents large particles from entering and clogging the sensor. The device can both detect a gas but also measure its concentration, for our purposes we want to measure it. Furthermore, as illustrated in Figure 2.2, the actual sensing unit is placed in suspension, this is to make sure the sensor is reading passing air.
 There are 6 wire connections from the sensing unit. Denominated A,H and B, they are 2 H wires made out of Nickel and Chromium with the purpose of heating the unit,, and 4 A and B wires that are made out of Platinum and are used for the output signals. The base is composed of bakelite which is plastic material that is resistant to high levels of heat and also has very low conductivity properties.
@@ Line 45: / Line 45: @@
 {{ :amc2022:grouph:mq2_sensing_unit2.png?nolink&400 |}}
-**//  Figure 2.//** MQ2 Sensor, Inside View. Source: https://lastminuteengineers.com/mq2-gas-senser-arduino-tutorial/}}
+**//  Figure 2.2//** MQ2 Sensor, Inside View. Source: https://lastminuteengineers.com/mq2-gas-senser-arduino-tutorial/}}
 {{ :amc2022:grouph:mq2_sensing_unit.png?nolink&400 |}}
-**//  Figure 3.//** MQ2 Sensing Unit. Source: https://lastminuteengineers.com/mq2-gas-senser-arduino-tutorial/}}
+**//  Figure 2.3//** MQ2 Sensing Unit. Source: https://lastminuteengineers.com/mq2-gas-senser-arduino-tutorial/}}
@@ Line 58: / Line 58: @@
 ((How MQ2 Gas/Smoke Sensor Works? & Interface it with Arduino ,  https://lastminuteengineers.com/mq2-gas-senser-arduino-tutorial/))
-The process is well illustrated in Figure #, shown below.
+The process is well illustrated in Figure 2.4, shown below.
 {{ :amc2022:grouph:mq2-gas-sensor-working.gif?nolink&400 |}}
-**//  Figure 2.//** Chemical process altering the resistance in the module which causes a change in voltage output. Source: http://lastminuteengineers.com}}
+**//  Figure 2.4//** Chemical process altering the resistance in the module which causes a change in voltage output. Source: http://lastminuteengineers.com}}
@@ Line 71: / Line 71: @@
 ====Reading the Data:====
-The MQ-2 sensor functions as a voltage divider. The analog voltage output varies accordingly with the  concentration of combustible gasses and its interaction with the oxygen, thus yielding  a higher voltage proportional to the quantity of the present  gas. The sensor cannot determine which gas is present, however the interaction with any of the possible measurable gasses creates a distinct pattern that has been provided by the manufacturers, shown in Figure #. By creating a code that follows the guidelines set by the manufacturer design we can then measure with a small margin of error, the concentration of distint types of gasses in the air simply by analyzing the resistance ratio  of the sensor (RS/R0).
+The MQ-2 sensor functions as a voltage divider. The analog voltage output varies accordingly with the  concentration of combustible gasses and its interaction with the oxygen, thus yielding  a higher voltage proportional to the quantity of the present  gas. The sensor cannot determine which gas is present, however the interaction with any of the possible measurable gasses creates a distinct pattern that has been provided by the manufacturers, shown in Figure 2.5. By creating a code that follows the guidelines set by the manufacturer design we can then measure with a small margin of error, the concentration of distinct types of gasses in the air simply by analyzing the resistance ratio  of the sensor (RS/R0).
 ((https://thestempedia.com/tutorials/interfacing-mq-2-gas-sensor-with-evive/))
@@ Line 77: / Line 77: @@
   * R0 is the value given or base number of the resistance found on the sensor for fresh air.
   * For the MQ-2 sensor  the ratio given by the manufacturer of RS/R0 is 9.8.
-  * Specified in Figure # and in the specifications of the manufacturer, the sensor can only read gas concentrations between 200 and 10000ppm.
+  * Specified in Figure 2.5 and in the specifications of the manufacturer, the sensor can only read gas concentrations between 200 and 10000ppm.
 {{ :amc2022:grouph:mq2-gas-sensor-graph.png?nolink&600 |}}
-**//  Figure 2.//** MQ2 Sensitivity characteristics. Source: https://www.mouser.com/datasheet/2/321/605-00008-MQ-2-Datasheet-370464.pdf}}
+**//  Figure 2.5//** MQ2 Sensitivity characteristics. Source: https://www.mouser.com/datasheet/2/321/605-00008-MQ-2-Datasheet-370464.pdf}}