first commit

libraries/M5Unit-ENV/examples/Unit_CO2_M5Core/Unit_CO2_M5Core.ino

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+
+#include "M5UnitENV.h"
+
+SCD4X scd4x;
+
+void setup() {
+    Serial.begin(115200);
+
+    if (!scd4x.begin(&Wire, SCD4X_I2C_ADDR, 21, 22, 400000U)) {
+        Serial.println("Couldn't find SCD4X");
+        while (1) delay(1);
+    }
+
+    uint16_t error;
+    // stop potentially previously started measurement
+    error = scd4x.stopPeriodicMeasurement();
+    if (error) {
+        Serial.print("Error trying to execute stopPeriodicMeasurement(): ");
+    }
+
+    // Start Measurement
+    error = scd4x.startPeriodicMeasurement();
+    if (error) {
+        Serial.print("Error trying to execute startPeriodicMeasurement(): ");
+    }
+
+    Serial.println("Waiting for first measurement... (5 sec)");
+}
+
+void loop() {
+    if (scd4x.update())  // readMeasurement will return true when
+                         // fresh data is available
+    {
+        Serial.println();
+
+        Serial.print(F("CO2(ppm):"));
+        Serial.print(scd4x.getCO2());
+
+        Serial.print(F("\tTemperature(C):"));
+        Serial.print(scd4x.getTemperature(), 1);
+
+        Serial.print(F("\tHumidity(%RH):"));
+        Serial.print(scd4x.getHumidity(), 1);
+
+        Serial.println();
+    } else {
+        Serial.print(F("."));
+    }
+
+    delay(1000);
+}