B4R Code Snippet XGZP6897D pressure sensors family

Modern pressure sensors where combined the piezoresistive pressure sensor and the ADC chipset with 24-bit resolution and I2C digital interface (and for temperature 16-bit one).

#Region Project Attributes
    #AutoFlushLogs: True
    #CheckArrayBounds: True
    #StackBufferSize: 600
#End Region

Sub Process_Globals
    Public Serial1 As Serial
End Sub

Private Sub AppStart
    Serial1.Initialize(115200)
    Log("AppStart")
    esp_xgzp.Start_xgzp
End Sub

'https://cfsensor.com/wp-content/uploads/2022/11/XGZP6847D-Pressure-Sensor-V2.5.pdf
'https://github.com/fanfanlatulipe26/XGZP6897D
'I2C device found at address: 0x6D (109)
'Adopted by Vlad Pomelov aka Peacemakerv to B4R.
'v.0.1
'module esp_xgzp

Private Sub Process_Globals
    'These global variables will be declared once when the application starts.
    'Public variables can be accessed from all modules.
    Dim Ready_flag As Boolean
    Private Busy As Boolean
    'set K - scale coefficient 8 ... 8192 in the inline-c code below for your sensor type
    Dim temp, pressure As Float    'C°, Pa
    Dim Timer1 As Timer
End Sub

Sub Start_xgzp
    Log("Start reading xgzp...")
    Dim res As Byte = RunNative("prepare_xgzp", Null)
    If res > 0 Then
        Timer1.Initialize("Timer1_Tick", 1000)
        Timer1.Enabled = True
        Timer1_Tick
    Else
        Log("xgzp - prepare error.")
    End If
End Sub

Sub Stop
    Timer1.Enabled = False
    Log("esp_xgzp stopped")
End Sub

Private Sub Timer1_Tick
    If Busy Then
        Return
    End If
    Busy = True
    Ready_flag = False
    RunNative("read_xgzp", Null)
    Log("temperature = ", temp, "; pressure = ", pressure)
    Ready_flag = True
    Busy = False
End Sub

#if C
#include <XGZP6897D.h>
#include <Wire.h>

/*
   K value for XGZP6897D. It depend on the pressure range of the sensor.
   Table found in the data sheet from CFSensor.com
    https://cfsensor.com/product-category/i2c-sensor/
  pressure_range (kPa)   K value
  500<P≤1000              8
  260<P≤500               16
  131<P≤260               32
  65<P≤131                64
  32<P≤65                 128
  16<P≤32                 256
  8<P≤16                  512
  4<P≤8                   1024
  2≤P≤4                   2048
  1≤P<2                   4096
  P<1                     8192
  the K value is selected according to the positive pressure value only,
  like -100～100kPa,the K value is 64.
*/

// K value for a XGZP6897D  -500-500kPa
#define K 16 // see table above for the correct value for your sensor, according to the sensitivity.


XGZP6897D sensor_xgzp(K);
float pressure, temperature;
B4R::Object returnvalue_xgzp;

B4R::Object* prepare_xgzp(B4R::Object* o) {
  Wire.begin();
  if (!sensor_xgzp.begin()) {
    return returnvalue_xgzp.wrapNumber(0);
  }
  return returnvalue_xgzp.wrapNumber(1);
}

 
void read_xgzp(B4R::Object* o) {
  // read the temperature (in °Celsius), and the pressure (in Pa)
  sensor_xgzp.readSensor(temperature, pressure);
  b4r_esp_xgzp::_temp = temperature;
  b4r_esp_xgzp::_pressure = pressure;
}
#End If

AppStart
Start reading xgzp...
temperature = 29.0078; pressure = 784.1250
temperature = 28.9805; pressure = 847.9375
temperature = 28.9492; pressure = 797.5000
temperature = 28.9336; pressure = 796.6875 'default atmospheric pressure at K = 16
temperature = 28.8984; pressure = 902.7500
temperature = 28.8750; pressure = 856.1250
temperature = 28.8633; pressure = 681.6875
temperature = 28.8398; pressure = 799.0625
temperature = 28.8164; pressure = 873.8750
temperature = 28.8047; pressure = 748.3125
temperature = 28.7656; pressure = 992.6875
temperature = 28.7500; pressure = 3924.6250 'blowing pressure
temperature = 28.7305; pressure = 5456.3125
temperature = 28.7109; pressure = 813.3750
temperature = 28.6953; pressure = 914.1250
temperature = 28.6914; pressure = 809.6250
temperature = 28.6641; pressure = 784.8750