ESP Easy PMS3003 Value zero ???

Using Arduino Sensors
2

Could you post your formatted code in code tags?

On the ESP GPIO1 and GPIO3 are used for serial monitor.

There are several hardware serial ports on the ESP, GPIO1 and GPIO3, Serial, should NOT be used for your projects.

The ESP does not use Serial2, Serial3, or SerialX, instead you, the programmer, can use Serial (0), Serial (1), and Serial (2).

Serial (2) is the easiest to use as it does not require Matrix re-definition. Serial (1), normally, requires an extra line of code.

To use Serial (2) on an ESP you will need to include the ESP32 serial hardware API:

#include <HardwareSerial.h>

You will then need to define your serial device like so:

HardwareSerial SerialBrain( 2 );
//serial (2) = pin16=RXgreen , pin17=TX white

Note the pins used for serial (2) are the natural pins for serial (2) on the ESP.
In setup() initialize your defined serial portSerialBrain.begin( SerialDataBits );
and then use the serial port:

void fSendSerialToBrain( void *pvParameters )
{
  struct stu_LIDAR_INFO pxLIDAR_INFO;
  xSemaphoreGive ( sema_SendSerialToBrain );
  String sSerial;
  sSerial.reserve ( 300 );
  for (;;)
  {
    xEventGroupWaitBits (eg, evtSendSerialToBrain, pdTRUE, pdTRUE, portMAX_DELAY);
    if ( xSemaphoreTake( sema_SendSerialToBrain, xZeroTicksToWait ) == pdTRUE ) // grab semaphore, no wait
    {
      int CellCount = 1;
      xSemaphoreTake( sema_LIDAR_INFO, xSemaphoreTicksToWait );
      xQueueReceive ( xQ_LIDAR_INFO, &pxLIDAR_INFO, QueueReceiveDelayTime );
      xSemaphoreGive( sema_LIDAR_INFO );
      sSerial.concat( "<!," ); //sentence begin
      sSerial.concat( String(ScanPoints) + "," );
      for ( CellCount; CellCount <= ScanPoints; CellCount++ )
      {
        sSerial.concat( String(pxLIDAR_INFO.Range[CellCount]) + "," );
      }
      sSerial.concat( ">" ); //sentence end
      SerialBrain.println ( sSerial );
      sSerial = "";
    }
  }
  vTaskDelete( NULL );
} // void fSendSerialToBrain( void *pvParameters )