2025-05-1600

include/CO2.h

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+#include <Arduino.h>
+
+#include <HardwareSerial.h>
+
+HardwareSerial Co2Port(1); // use UART2
+
+// co2 Grenzwerte
+/* #define CO2_WARN_1 650
+#define CO2_WARN_2 950
+#define CO2_WARN_3 1250
+#define CO2_WARN_4 1500
+#define CO2_CRITICAL_PPM 1850 */
+/* #define CO2_WARN_1 600
+#define CO2_WARN_2 800
+#define CO2_WARN_3 1000
+#define CO2_WARN_4 1500
+#define CO2_WARN_5 2000 */
+#define CO2_WARN_1 800
+#define CO2_WARN_2 1000
+#define CO2_WARN_3 1400
+#define CO2_WARN_4 1500
+#define CO2_WARN_5 2000
+#define CO2_CRITICAL_PPM 1850
+
+int CO2Wert = -99;
+char antwort[100] = {0xFF};
+int range =2000;
+bool readCo2Flag;
+
+char getCheckSum(char *packet)
+  {
+    char i, checksum;
+    for (i = 1; i < 8; i++)
+    {
+      checksum += packet[i];
+    }
+    checksum = 0xFF - checksum;
+    return checksum +1;
+  }
+
+int readCO2() {
+  char cmd[9] = {0xFF, 0x01, 0x86, 0x00, 0x00, 0x00, 0x00, 0x00, 0x79};
+  Co2Port.write(cmd,9);
+  if(Co2Port.available()) {
+    Co2Port.readBytes(antwort, 9);
+  }
+  #ifdef DebugCO2
+  for (int a=0; a<9; a++){
+    Serial.printf(" BufferRead [%d] = 0x%02X \n", a, antwort[a]);
+  }
+  Serial.println();
+  #endif
+  if (antwort[0] != 0xFF) return -1;
+  if (antwort[1] != 0x86) return -2;
+  int antwortHigh = (int) antwort[2]; // CO2 High Byte
+  int antwortLow = (int) antwort[3];  // CO2 Low Byte
+  int ppm = (256 * antwortHigh) + antwortLow;
+  Co2Port.flush();
+  return ppm; 
+}
+
+void calibrationCo2() {
+  char cmd[9] = {0xFF, 0x01, 0x79, 0xA0, 0x00, 0x00, 0x00, 0x00, 0x00};
+  cmd[8] = getCheckSum(cmd);
+  Serial.printf("Checksumme = 0x%02X\n", cmd[8]);
+  Co2Port.write(cmd,9);
+  #ifdef DebugCO2
+  for (int a=0; a<9; a++){
+    Serial.printf(" BufferCalibration [%d] = 0x%02X \n", a, cmd[a]);
+  }
+  Serial.println();
+  #endif
+}
+
+void setRange()
+{
+  char cmd[9] = {0xFF, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
+  
+  cmd[6] = range >> 8;
+  cmd[7] = range & 0xFF;
+  cmd[8] = getCheckSum(cmd);
+  Serial.printf("Checksumme = 0x%02X\n", cmd[8]);
+  Co2Port.write(cmd,9);
+  #ifdef DebugCO2
+  for (int a=0; a<9; a++){
+    Serial.printf(" BufferRange [%d] = 0x%02X \n", a, cmd[a]);
+  }
+  Serial.println();
+  #endif
+}
+
+void beginC02()
+{
+  Co2Port.begin(9600, SERIAL_8N1, 32, 33); 
+  readCo2Flag = false;
+  delay(100);
+  calibrationCo2();
+  delay(100);
+  setRange();
+  delay(100);
+}

include/README

@@ -0,0 +1,39 @@
+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

include/mess_HTU21D.h

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+#include "Adafruit_HTU21DF.h"
+
+Adafruit_HTU21DF htu = Adafruit_HTU21DF();
+
+struct {
+  char temperature[15] = {0};
+  char humity[15] = {0};
+} htuData;
+
+void init_HTU21(){
+    if (!htu.begin()) {
+        Serial.println("Couldn't find sensor HUT21D!");
+        while (1);
+    }
+    Serial.println("HUT21D gefunden");
+}
+
+void read_HTU21D() {
+    float t = htu.readTemperature();
+    dtostrf(t,10,4,htuData.temperature);
+    float h = htu.readHumidity();
+    dtostrf(h,8,2,htuData.humity);
+}
+
+void M2M_HTU21D(long deviceId = 4711) {
+    char topic[100];
+    sprintf(topic, "%s%ld%s", "hjk/devices/", deviceId, "/telemetry/temperature_Htu_21" );
+    client.publish(topic, htuData.temperature, true);
+    sprintf(topic, "%s%ld%s", "hjk/devices/", deviceId, "/telemetry/humity" );
+    client.publish(topic, htuData.humity, true);
+    Serial.printf("HTU21:\t\t %s °C\n", htuData.temperature);
+    Serial.printf("HTU21:\t\t %s %% \n", htuData.humity);