[werk_ag]

Hi,

Thanks for the closeup pictures

Regarding the PMS7003, the SET pin is there, you should use the cable interface, not the pin headers.
The SET pin is the one that turns the PMS7003 fan ON and OFF. If the fan doesn't turn ON there are no readings.

Regarding the SCD30 the connections seem correct.

Being an initial setup I suggest starting just with the PMS7003, there is no need to disconnect the CO2 sensor, you may just disable it

Code:

// --------------------------------------------------------------------------------------
//   Define type of CO2 sensor
// --------------------------------------------------------------------------------------
#define CO2_SENSORTYPE  0    // 0= Not instaled, 1= Sensirion SDC30, 2= MH-Z19

on the Config_options.h file, compile the code and upload. Then when you have readings from the PMS7003, enable the CO2 sensor again,

Code:

// --------------------------------------------------------------------------------------
//   Define type of CO2 sensor
// --------------------------------------------------------------------------------------
#define CO2_SENSORTYPE  1    // 0= Not instaled, 1= Sensirion SDC30, 2= MH-Z19

compile and upload the code.

Keep me informed on the progress, and we will get there.

Rgs
Werk_AG