Version 2023-04-12

.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

.vscode/settings.json

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+{
+    "C_Cpp.errorSquiggles": "Disabled",
+    "cmake.configureOnOpen": true
+}

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_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

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+
+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

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:nodemcu-32s]
+platform = espressif32
+board = nodemcu-32s
+framework = arduino
+monitor_port = COM4
+monitor_speed = 115200
+monitor_filters = time
+upload_port = COM4
+
+build_flags =
+    -DNoDEBUG
+    -DHELLIGKEIT
+    -DNoDebugCO2
+
+lib_deps =
+    knolleary/PubSubClient @ 2.8
+    adafruit/Adafruit GFX Library @ 1.10.4
+    2dom/PxMatrix LED MATRIX library @ 1.8.2
+    adafruit/Adafruit BusIO @ 1.7.2
+    adafruit/Adafruit HTU21DF Library @ 1.0.5
+    

test/README

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+
+This directory is intended for PlatformIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html