From 51578fb52c25cb417fefb3216444f75f6444373c Mon Sep 17 00:00:00 2001
From: Nils Rossmann <nrossmann@towaho.de>
Date: Thu, 10 Dec 2020 21:56:40 +0100
Subject: [PATCH] set calibration ppm via config file

---
 Software/co2ampel/co2ampel.ino | 9 ++++++---
 Software/co2ampel/config.h     | 4 ++--
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/Software/co2ampel/co2ampel.ino b/Software/co2ampel/co2ampel.ino
index 9a0bd7d..07f017f 100644
--- a/Software/co2ampel/co2ampel.ino
+++ b/Software/co2ampel/co2ampel.ino
@@ -128,12 +128,15 @@ void setConfig(String& jsonString) {
 }
 
 void startCalibration() {
+
+  uint16_t calibration_ppm = configManager.getUintValue("calibration_ppm", SCD30_CALIBRATION_PPM);
+  
   ledSetColor(YELLOW2);
   delay(600000); // wait 10min
   bool ok = false;
   uint8_t calCount=0;
   while (!ok && calCount<5) {
-    ok = airSensor.setForcedRecalibrationFactor(SCD30_CALIBRATION_PPM);
+    ok = airSensor.setForcedRecalibrationFactor(calibration_ppm);
     Serial.print("calibration status from sensor: ");
     Serial.println(ok);
     ledSetColor(BLUE);
@@ -158,8 +161,8 @@ void startCalibration() {
     delay(60000);
     
     // check the next 20 values whether they are within the specification: +-(30ppm+3%MV)
-    uint16_t co2min=SCD30_CALIBRATION_PPM-(30+0.03*SCD30_CALIBRATION_PPM);
-    uint16_t co2max=SCD30_CALIBRATION_PPM+(30+0.03*SCD30_CALIBRATION_PPM);
+    uint16_t co2min=calibration_ppm-(30+0.03*calibration_ppm);
+    uint16_t co2max=calibration_ppm+(30+0.03*calibration_ppm);
     for (uint8_t i=0; i < 20; i++) {
       while (!digitalRead(GPIO_SCD30_RDY) || ! airSensor.dataAvailable()) {
         delay(500);
diff --git a/Software/co2ampel/config.h b/Software/co2ampel/config.h
index 68792f4..63c081a 100644
--- a/Software/co2ampel/config.h
+++ b/Software/co2ampel/config.h
@@ -10,7 +10,7 @@
 #define CONFIG_H
 
 /******************************* Version **************************************/
-#define VERSION 4
+#define VERSION 5
 
 /******************************* MQTT **************************************/
 
@@ -38,7 +38,7 @@ enum Color {GREEN, YELLOW, RED, BLUE, DARK, WHITE, GREEN2, YELLOW2, RED2};
 #define SCD30_CALIBRATION_MIN_RUNTIME 180 //seconds
 #define SCD30_MEASUREMENT_INTERVAL 2 // seconds (recalibrate, if you change this value)
 #define SCD30_MIN_PPM 350
-#define SCD30_CALIBRATION_PPM 450 
+#define SCD30_CALIBRATION_PPM 450 // overriden by calibration_ppm from config.json 
 
 /******************************* thresholds **************************************/
 #define TH_GREEN 800 //overriden by th_green from config.json