4-20mA.ker doesn't read I2C sensor

Hi,

I'm trying to connect an I2C sensor (a SHT20) to a 4-20mA.ker to convert the readings into a 4-20ma signal that I want to read from an Industruino IND.I/O D21G with an Ethernet module installed.
Here you can find the wiki of an equivalent sensor: https://wiki.dfrobot.com/SHT20_I2C_Temperature_%26_Humidity_Sensor__Waterproof_Probe__SKU__SEN0227
When I connect the sensor to the 4-20mA.ker, it is not detected. I tried with an I2C scanner sketch and the sensor address is not highlighted as available.
I double-checked the color scheme of the wires and the electrical connections, but they seem correct.
I have already checked the sensor with an Arduino Uno and the DFRobot library and it works fine.

I have tried both the SERCOM1 and SERCOM3 configurations, but the sensor hasn't been detected anyway.
I have noticed that the Arduino IDE throw a warning because the "Wire" library appears to be for SAMD architectures, but the sketch is compiled and loaded correctly to the 4-20mA.ker.

For the scketch, I have simply combined the example for the 4-20mA.ker with the DHT11 sensor and the example of the supplier of the SHT20.

I'm stuck and running out of ideas, can you please give me some advice on how to proceed?

Thanks,

Edoardo

Here the code:

#include <Wire.h>
#include <DFRobot_SHT20.h>

DFRobot_SHT20 sht20;

int dt_mis = 2000 ;
void setup() {
  Wire.begin();               
  SerialUSB.begin(9600);
  DAC->CTRLB.bit.REFSEL = 0x00; //Set DAC to external VREF (2.5V)
  analogWriteResolution(12);
  digitalWrite(PIN_EXT_3V3_ENABLE, HIGH);
  sht20.initSHT20();                         // Init SHT20 Sensor
  delay(1000);
  sht20.checkSHT20();                       // Check SHT20 Sensor                            
}

void loop() {
 float temp, humd;
 int microamps;
  temp = sht20.readTemperature();   // Read Temperature
  SerialUSB.print("Temperatura: ");
  SerialUSB.println(temp);
  microamps = map(temp, 0, 80, 12000, 20000);           // MAPPING
  if (temp>80) microamps = 11000;
  analogWrite(PIN_DAC0, uAmap(microamps));
  delay(dt_mis);

  humd = sht20.readHumidity();                  // Read Humidity
  SerialUSB.print("Umidità: ");
    SerialUSB.println(humd);
  microamps = map(humd, 40, 100, 4000, 10000);           // MAPPING
  if (isnan(humd)) microamps = 11000;
  analogWrite(PIN_DAC0, uAmap(microamps));
  delay(dt_mis);

}

/////////////////////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////

// helper function to map milliamps to 0-4095 DAC range
int uAmap(int ua) {
  return map(ua, 3800, 20700, 0, 4095); // map microamps 3.8-20.7mA
}

I2C

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Edoardo

Edoardo

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Asked on 6/14/20, 3:02 PM

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