Add C02 Sensor as sensor 2 (C02 Ampel) // how to include a custom sensor

[hansju-11]

As an example of "how to include a custom sensor" I will use an scd30 C02 sensor
https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library
https://www.sensirion.com/de/umweltsensoren/kohlendioxidsensor/kohlendioxidsensoren-scd30/
https://www.sparkfun.com/products/15112

sensor is in parallel to the dispaly on i2c bus with address 0x61

• in sensor.cpp

  • include scd30-master lib from sparkFun
  • in function void sensor_init(void) put one time inti code
  • in function uint8_t *sensor_read(uint8_t sensor) -> case 2: read our sensor

• in payload.cpp
  -include sensor.h

• in paxcounter.conf (define are still in use in some other parts of the code)

  • #define HAS_SENSOR_1 1
  • #define HAS_SENSOR_2 1
  • #define HAS_SENSOR_3 0

• change js parser

  • I use payload encoder: 2=Packed
    if (port === 11) {
    // scd30 sensor data
    return decode(bytes, [uint16, ufloat, ufloat], ['C02', 'temp', 'humidity']);
    }
    return decoded;
    */