use arduino uno

platformio.ini

@@ -8,10 +8,11 @@
 ; Please visit documentation for the other options and examples
 ; https://docs.platformio.org/page/projectconf.html
 
+; nanoatmega328new
+
 [env:arduino]
 platform = atmelavr
-board = nanoatmega328new
+board = uno
 framework = arduino
 lib_deps =
      adafruit/Adafruit BME280 Library @ ^2.1.2
-;      miguel5612/MQUnifiedsensor @ ^2.0.1

src/main.cpp

@@ -2,7 +2,7 @@
 #include <MQ135.h>
 #include <Adafruit_BME280.h>
 
-#define PIN_MQ135 A7
+#define PIN_MQ135 A0
 #define PIN_NOISE 2
 #define PIN_LED_GREEN 3
 #define PIN_LED_GREEN2 4
@@ -27,8 +27,18 @@ void loop() {
   // float humidity = bme.readHumidity();
 
   // float r0 = co2_sensor.getCorrectedR0(temp, humidity);
+  float in = analogRead(PIN_MQ135);
+  double v = co2_sensor.getVoltage();
+  double r = co2_sensor.getResistance();
   float r0 = co2_sensor.getR0();
 
+  Serial.print("Analog Read: ");
+  Serial.println(in);
+  Serial.print("Voltage: ");
+  Serial.println(v);
+  Serial.print("Resistance: ");
+  Serial.println(r);
+
   // Serial.print("Temperature: ");
   // Serial.println(temp);
   // Serial.print("Humidity: ");
@@ -36,5 +46,7 @@ void loop() {
   Serial.print("R0: ");
   Serial.println(r0);
 
+  Serial.println("-----------------------------");
+
   delay(1000);
 }