From 06c7d3f8d567ee99b8a29d5ec6d032bdb392db07 Mon Sep 17 00:00:00 2001
From: dakkar <dakkar@thenautilus.net>
Date: Sun, 27 Mar 2022 13:05:57 +0100
Subject: low power co2 reading

---
 co2.h | 19 ++++++++++++++++---
 1 file changed, 16 insertions(+), 3 deletions(-)

diff --git a/co2.h b/co2.h
index ac963f4..55a37f5 100644
--- a/co2.h
+++ b/co2.h
@@ -36,16 +36,29 @@ public:
     }
     
     // Start Measurement
-    error = scd4x.startPeriodicMeasurement();
+    error = scd4x.startLowPowerPeriodicMeasurement();
     if (error) {
-        Serial.print("CO2 startPeriodicMeasurement() error: ");
+        Serial.print("CO2 startLowPowerPeriodicMeasurement() error: ");
         errorToString(error, errorMessage, 256);
         Serial.println(errorMessage);
     }
   }
 
   bool dataReady() {
-    return true;
+    uint16_t ready;
+    uint16_t error;
+    char errorMessage[256];
+
+    error = scd4x.getDataReadyStatus(ready);
+    if (error) {
+        Serial.print("CO2 getDataReadyStatus() error: ");
+        errorToString(error, errorMessage, 256);
+        Serial.println(errorMessage);
+        return false;
+    }
+
+    // "If last 11 bits are 0 data not ready, else data ready"
+    return ready & 0x7FFF == 0 ? false : true;
   }
   
   void read(SensorData *data) {
-- 
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