{"componentChunkName":"component---src-templates-blog-post-js","path":"/tutorials/esp32-aq-sensor/","result":{"data":{"site":{"siteMetadata":{"title":"TinoIoT","author":"TinoIoT Officers"}},"markdownRemark":{"id":"438db72f-090e-56f4-878f-33e99e461708","html":"

What you will need:

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Project Background

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With ongoing fires, air pollution, and many harmful impurities in the air, it’s important to understand how the data you see from air quality maps come to be. This project guides you through how to set up your own iot project to measure pm2.5 (particulate matters), which is a significant factor in calculating aqi (air quality index).

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This New York Department of Health article goes more in depth of the health hazards if you are interested: https://www.health.ny.gov/environmental/indoors/air/pmq_a.htm.

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This monitoring project is made achievable via pms5003 sensor using light scattering principle, and that coupled with the esp over thingspeak allows for you to access the data from the pms over the internet.

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Setting everything up / wiring

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This step applies if your purchase came with a connector. If it doesn’t, go to the next step titled wiring from pms to esp.

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The wiring for this module to its connector is as follows:

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From Right to Left:\nPin 1 Vcc: To Power supply (5V)\nPin 2 GND: To gnd (negative power)\nPin 3 SET: To SET, a TTL input signal\nPin 4 RXD: To RXD, serial receiving\nPin 5 TXD: To TXD, serial sending\nPin 6 RST: To RST, which is reset signal

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Be careful not to plug these in backwards.

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The descriptions on the sensor saying ttl@3.3V simply indicates that any voltage applied that is below 3.3V will not work/run. That is why, in the next step, we have to connect to 5V on the esp.

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If you skipped here without a connector, just follow the following steps, but use 4 male to male dupont cables directly from the black and red connector strip into the breadboard tie points (or breadholes, as we unironically call them) that match to each pin of the esp. 2 indents on the white connector should match up to the rails in the PMS’s sensor port. If you need to brush up on some breadboard how-to’s, refer to this post here. Remember - each connector and each pin should match to their respective destinations!

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The wiring from the pms5003 sensor to the esp8266 is as follows:\npms esp\nPin 1 Vcc: To Vin Pin (5V)\nPin 2 GND: To gnd\nPin 3 TXD: To TXD (tx)\nPin 4 RXD: To RXD (rx)

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\n \n \nint PM01Value = 0;\nint PM2_5Value = 0;\nint PM10Value = 0;\n\n// allow for data to be sent to your computer via wifi\nconst char *ssid = \"YOUR_WIFI_NAME\";\nconst char *password = \"YOUR_WIFI_PASSWORD\";\n\nString serverName = \"https://api.thingspeak.com/update?api_key=YOUR_WRITE_KEY\";\nWiFiClient client;\n\nunsigned long lastTime = 0;\nunsigned long timerDelay = 60000;\n\n// the setup loop's purpose is just to ensure connectivity and that your wifi is working\nvoid setup() {\n Serial.begin(9600);\n\n WiFi.begin(ssid, password);\n Serial.println(\"Connecting\");\n while (WiFi.status() != WL_CONNECTED) {\n delay(500);\n Serial.print(\".\");\n }\n Serial.println(\"\");\n Serial.print(\"Connected to WiFi network with IP Address: \");\n Serial.println(WiFi.localIP());\n}\n\nvoid loop() {\n // starts to read when it gets data from buffer\n if (Serial.find(0x42)) {\n Serial.readBytes(buf, LENG);\n\n // reads the sensor value in this loop and uses previous variable to keep track of it\n if (buf[0] == 0x4d) {\n if (checkValue(buf, LENG)) {\n PM01Value = transmitPM01(buf); // count PM1.0 value of the air detector module\n PM2_5Value = transmitPM2_5(buf); // count PM2.5 value of the air detector module\n PM10Value = transmitPM10(buf); // count PM10 value of the air detector module\n }\n }\n }\n\n// prints out the values read from the sensor out to your computer\n static unsigned long OledTimer = millis();\n if (millis() - OledTimer >= 1000) {\n OledTimer = millis();\n\n Serial.print(\"PM1.0: \");\n Serial.print(PM01Value);\n Serial.println(\" ug/m3\");\n\n Serial.print(\"PM2.5: \");\n Serial.print(PM2_5Value);\n Serial.println(\" ug/m3\");\n\n Serial.print(\"PM10 : \");\n Serial.print(PM10Value);\n Serial.println(\" ug/m3\");\n Serial.println();\n\n // if able to send data over to thingspeak, it will do so here, and allow it to be displayed. You can look at ts api for clarification as needed\n if (client.connect(server, 80)) {\n String postStr = apiKey;\n postStr += \"&field1=\";\n postStr += String(PM01Value);\n postStr += \"&field2=\";\n postStr += String(PM2_5Value);\n postStr += \"&field3=\";\n postStr += String(PM10Value);\n postStr += \"\\r\\n\\r\\n\";\n\n client.print(\"POST /update HTTP/1.1\\n\");\n client.print(\"Host: api.thingspeak.com\\n\");\n client.print(\"Connection: close\\n\");\n client.print(\"X-THINGSPEAKAPIKEY: \" + apiKey + \"\\n\");\n client.print(\"Content-Type: application/x-www-form-urlencoded\\n\");\n client.print(\"Content-Length: \");\n client.print(postStr.length());\n client.print(\"\\n\\n\");\n client.print(postStr);\n }\n client.stop();\n }\n}\n\nchar checkValue(unsigned char *thebuf, char leng) {\n char receiveflag = 0;\n int receiveSum = 0;\n\n for (int i = 0; i < (leng - 2); i++) {\n receiveSum = receiveSum + thebuf[i];\n }\n receiveSum = receiveSum + 0x42;\n\n // check the serial data\n if (receiveSum == ((thebuf[leng - 2] << 8) + thebuf[leng - 1])) {\n receiveSum = 0;\n receiveflag = 1;\n }\n return receiveflag;\n}\n\nint transmitPM01(unsigned char *thebuf) {\n int PM01Val;\n PM01Val = ((thebuf[3] << 8) + thebuf[4]); // count PM1.0 value of the air detector module\n return PM01Val;\n}\n\n// transmit PM Value to PC\nint transmitPM2_5(unsigned char *thebuf) {\n int PM2_5Val;\n PM2_5Val = ((thebuf[5] << 8) + thebuf[6]); // count PM2.5 value of the air detector module\n return PM2_5Val;\n}\n\n// transmit PM Value to PC\nint transmitPM10(unsigned char *thebuf) {\n int PM10Val;\n PM10Val = ((thebuf[7] << 8) + thebuf[8]); // count PM10 value of the air detector module\n return PM10Val;\n}\n

In a few minutes, you should now see 3 live data plots graphing pm1, 2.5, and 10! Congrats!

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