try SDS011

README.md

@@ -36,6 +36,20 @@ SDA        | IO21      |
 SDO        | nc        | SPI only
 CS         | nc        | SPI only
 
+### SDS011
+
+Serial (HardwareSerial2)
+
+SDS011 pin | ESP32 pin | Notes
+-----------|-----------|----------
+TXD        | IO16      |
+RXD        | IO17      |
+GND        | GND       |
+25µm       | nc        |
+5V         | VUSB      |
+1µm        | nc        |
+NC         | nc        |
+
 ## Build & Install
 
 ```bash

platformio.ini

@@ -34,6 +34,7 @@ lib_deps =
     Adafruit GFX Library
     Adafruit BME280 Library
     Adafruit Unified Sensor
+    SDS011 sensor Library
 ;    ArduinoJSON
 
 monitor_speed = 115200

src/main.cpp

@@ -19,6 +19,8 @@
 #include <Adafruit_Sensor.h>
 #include "Adafruit_BME280.h"
 
+#include <SDS011.h>
+
 #include "XD0OTA.h"
 #include "XD0MQTT.h"
 
@@ -27,6 +29,8 @@ static const char* TAG = "MAIN";
 WiFiMulti wifiMulti;
 GxEPD2_BW<GxEPD2_213_B72, GxEPD2_213_B72::HEIGHT> display(GxEPD2_213_B72(/*CS=SS*/ TFT_CS, /*DC=*/ TFT_DC, /*RST=*/ TFT_RST, /*BUSY=*/ -1)); // GDEH0213B72
 Adafruit_BME280 bme; // I2C (also available: hardware SPI
+SDS011 my_sds;
+HardwareSerial serialport(2);
 
 XD0MQTT mqtt;
 
@@ -113,6 +117,9 @@ void setup()
   bme.setIIRFilterSize(BME680_FILTER_SIZE_3);
   bme.setGasHeater(320, 150); // 320*C for 150 ms
 */
+
+  my_sds.begin(&serialport);
+
   wifiMulti.addAP(WIFI_SSID, WIFI_PASSWD);
   wifiMulti.addAP(WIFI_SSID2, WIFI_PASSWD2);
 
@@ -153,6 +160,17 @@ void loop()
   Serial.print("Gas = "); Serial.print(bme.gas_resistance / 1000.0); Serial.println(" KOhms");
   display.print("Gas: "); display.print(bme.gas_resistance / 1000.0); display.println(" KOhms");
 */
+
+  float p10, p25;
+  int error;
+
+  error = my_sds.read(&p25, &p10);
+  if (!error) {
+    Serial.println("P.2.5: " + String(p25));
+    Serial.println("P10:  " + String(p10));
+  }
+
+
   printValues();
 
   if(wifiMulti.run() != WL_CONNECTED) {