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--- documentation:microcontroleurs:arduino:modules:mq135:index [2024/10/12 11:15] – [SPECIFICATIONS] f1sls
+++ documentation:microcontroleurs:arduino:modules:mq135:index [2024/10/12 12:06] (Version actuelle) – [ESP8266/ESP32 CODE EXAMPLES] f1sls
@@ Ligne 27: / Ligne 27: @@
 {{:documentation:microcontroleurs:arduino:modules:mq135:mq135_02.png?500}}
+===== CALIBRATION =====
+<blockquote>
+Initial preparation of the module shouldn’t present any undue difficulties if you strictly follows the procedure lined here. Well, first of all power up the module alone with a regulated 5VDC power supply. The heater of the MQ-135 sensor requires 5V and have 33Ω±5% resistance, so your power supply must render a minimum 200mA of current for the sensor part. Remember that at first the MQ-135 gas sensor have to be kept on continuously for its preheating time (over 24 hour) before you can actually play with it. Thereafter, introduce the MQ-135 sensor to the gas you want to detect and slowly adjust the trimpot until DO gets low.
+Now every time your sensor gets introduced to that gas at predefined concentration, DO will go low (0V) else will remain high (5V). Note that the green LED (OUT_LED) should also light up when gas is observed. Also note that when the sensor is powered up for gas detection, it needs around 60-120 seconds to settle, because the heater will need that much time to heat the sensor up. Remember, the MQ-135 gas sensor is suitable for detecting (or measuring) of NH3, NOx, alcohol, Benzene, smoke, CO2, etc.
+</blockquote>
+===== SCHEMATICS =====
+{{:documentation:microcontroleurs:arduino:modules:mq135:air-quality-sensor-mq135-re-schematic-tk.png|}}
 ===== PINOUT =====
@@ Ligne 33: / Ligne 47: @@
 ===== WIRING =====
+==== ARDUINO ====
 {{:documentation:microcontroleurs:arduino:modules:mq135:mq-135-gas-sensor-with-arduino-schematic-diagram.png?600|}}
 \\
 {{:documentation:microcontroleurs:arduino:modules:mq135:mq135_03.png?500}}
+==== ESP9266/ESP32 ====
+{{:documentation:microcontroleurs:arduino:modules:mq135:mq135_esp32_wiring_01.png?600|}}
+----
+{{:documentation:microcontroleurs:arduino:modules:mq135:airqualityschematic.png|}}
 ===== ARDUINO CODE EXAMPLE =====
@@ Ligne 67: / Ligne 87: @@
 </code>
-=== NORMAL VALUES ===
-  * Normal air returns approximately 100-150
-  * Alcohol returns approximately 700
-  * Lighter gas returns approximately 750
 ==== EXAMPLE #2 ====
@@ Ligne 95: / Ligne 111: @@
 </code>
-===== SENSOR DATA =====
+===== ESP8266/ESP32 CODE EXAMPLES =====
+  * https://github.com/maaz-siddiqui/ESP32_MQ-135_SH1106
+  * {{ :documentation:microcontroleurs:arduino:modules:mq135:mq135-air_quality.ino |}}
+  * https://github.com/ilya0/IoTAirsensor
+  * https://community.dfrobot.com/makelog-312138.html
+===== VALUES =====
+<WRAP left round info 33%>
+  * Normal air returns approximately 100-150
+  * Alcohol returns approximately 700
+  * Lighter gas returns approximately 750
+</WRAP>
+<WRAP left round tip 33%>
+  * 400ppm – 750ppm: Good for health
+  * 750 ppm – 1200 ppm: Take care
+  * 1200 ppm (and above): Harmful to health
+</WRAP>
+===== DOCUMENTATION =====
   * {{ :documentation:microcontroleurs:arduino:modules:mq135:sns-mq135.pdf | MQ-135 Gas Sensor Technical Data}}
+  * {{ :documentation:microcontroleurs:arduino:modules:mq135:mq135_ver1.4_-_manual.pdf |MQ135 (Ver1.4) - Manual}}
+  * {{ :documentation:microcontroleurs:arduino:modules:mq135:how_to_use_mq-135_gas_sensor_-_codrey_electronics.pdf |How To Use MQ-135 Gas Sensor - Codrey Electronics}}

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