Found model Si7021 Rev(2) Serial #FA30C12615B5FFFF

~t=23.5, ~RH=20.5

GY Si7021GY SHT35GY SHT31GY SHT21CMJU SHT21GY HTU21HTU21 2AM2302 DHT22DHT11

t: 23.74 RH: 31.05
t: 23.73 RH: 30.62
t: 23.73 RH: 30.72
t: 23.74 RH: 30.79
t: 23.74 RH: 30.46
t: 23.77 RH: 30.60
t: 23.76 RH: 30.60
t: 23.75 RH: 30.43
t: 23.75 RH: 30.50
t: 23.73 RH: 30.52
t: 23.73 RH: 30.88
t: 23.75 RH: 30.56
t: 23.73 RH: 30.69
t: 23.76 RH: 30.44
t: 23.73 RH: 30.17
t: 23.74 RH: 30.63
t: 23.74 RH: 30.66
t: 23.74 RH: 30.43
t: 23.73 RH: 30.71
t: 23.73 RH: 30.48
t: 23.73 RH: 30.73
t: 23.74 RH: 30.75
t: 23.73 RH: 30.38
t: 23.73 RH: 30.70
t: 23.71 RH: 30.33
t: 23.74 RH: 30.44
t: 23.72 RH: 30.71
t: 23.73 RH: 30.36
t: 23.71 RH: 30.68
t: 23.74 RH: 30.38
t: 23.71 RH: 30.48
t: 23.72 RH: 30.56
t: 23.74 RH: 30.53
t: 23.73 RH: 30.43

T: 23.91 RH: 23.18
T: 23.91 RH: 23.17
T: 23.89 RH: 23.17
T: 23.89 RH: 23.15
T: 23.91 RH: 23.12
T: 23.89 RH: 23.12
T: 23.92 RH: 23.11
T: 23.91 RH: 23.04
T: 23.89 RH: 23.12
T: 23.91 RH: 23.07
T: 23.91 RH: 23.04
T: 23.89 RH: 23.03
T: 23.88 RH: 23.03
T: 23.89 RH: 22.98
T: 23.89 RH: 23.00
T: 23.89 RH: 22.98
T: 23.89 RH: 23.00
T: 23.88 RH: 22.98
T: 23.92 RH: 23.04
T: 23.91 RH: 23.04
T: 23.89 RH: 23.01
T: 23.89 RH: 23.03
T: 23.88 RH: 23.07
T: 23.91 RH: 23.09
T: 23.91 RH: 23.14
T: 23.88 RH: 23.10
T: 23.91 RH: 23.06
T: 23.91 RH: 23.06
T: 23.92 RH: 23.06
T: 23.91 RH: 22.98
T: 23.91 RH: 22.92
T: 23.89 RH: 22.93
T: 23.91 RH: 22.93
T: 23.88 RH: 22.93

T: 24.03 RH: 22.79
T: 24.01 RH: 22.74
T: 24.03 RH: 22.70
T: 24.03 RH: 22.76
T: 24.01 RH: 22.82
T: 24.01 RH: 22.84
T: 24.00 RH: 22.85
T: 24.01 RH: 22.80
T: 24.00 RH: 22.75
T: 24.01 RH: 22.74
T: 24.01 RH: 22.82
T: 24.03 RH: 22.74
T: 24.00 RH: 22.82
T: 24.01 RH: 22.79
T: 24.01 RH: 22.79
T: 24.00 RH: 22.82
T: 24.01 RH: 22.75
T: 24.00 RH: 22.80
T: 24.00 RH: 22.77
T: 24.01 RH: 22.79
T: 24.03 RH: 22.69
T: 24.01 RH: 22.69
T: 24.00 RH: 22.65
T: 24.03 RH: 22.67
T: 24.01 RH: 22.70
T: 24.01 RH: 22.69
T: 24.01 RH: 22.64
T: 24.03 RH: 22.62
T: 24.03 RH: 22.66
T: 24.01 RH: 22.64
T: 24.00 RH: 22.60
T: 24.03 RH: 22.62
T: 24.03 RH: 22.64
T: 24.03 RH: 22.57

T: 23.96 RH: 32.27
T: 23.96 RH: 32.23
T: 23.96 RH: 32.19
T: 23.96 RH: 32.19
T: 23.96 RH: 32.15
T: 23.96 RH: 32.15
T: 23.96 RH: 32.15
T: 23.97 RH: 32.15
T: 23.97 RH: 32.19
T: 23.97 RH: 32.19
T: 23.97 RH: 32.23
T: 23.97 RH: 32.23
T: 23.97 RH: 32.19
T: 23.97 RH: 32.19
T: 23.97 RH: 32.15
T: 23.97 RH: 32.15
T: 23.97 RH: 32.07
T: 23.97 RH: 32.07
T: 23.97 RH: 32.03
T: 23.96 RH: 31.99
T: 23.97 RH: 31.99
T: 23.97 RH: 31.99
T: 23.97 RH: 31.99
T: 23.97 RH: 31.99
T: 23.97 RH: 31.99
T: 23.97 RH: 31.99
T: 23.97 RH: 31.95
T: 23.97 RH: 31.91
T: 23.97 RH: 31.91
T: 23.97 RH: 31.87
T: 23.97 RH: 31.83
T: 23.97 RH: 31.83
T: 23.97 RH: 31.83
T: 23.97 RH: 31.83

T: 23.94 RH: 21.22
T: 23.94 RH: 21.22
T: 23.94 RH: 21.38
T: 23.92 RH: 21.54
T: 23.92 RH: 21.70
T: 23.92 RH: 21.74
T: 23.92 RH: 21.90
T: 23.92 RH: 21.85
T: 23.92 RH: 21.74
T: 23.91 RH: 21.65
T: 23.91 RH: 21.58
T: 23.91 RH: 21.50
T: 23.91 RH: 21.46
T: 23.91 RH: 21.38
T: 23.91 RH: 21.30
T: 23.90 RH: 21.29
T: 23.90 RH: 21.45
T: 23.91 RH: 21.50
T: 23.91 RH: 21.58
T: 23.90 RH: 21.56
T: 23.90 RH: 21.60
T: 23.90 RH: 21.60
T: 23.90 RH: 21.64
T: 23.90 RH: 21.60
T: 23.90 RH: 21.60
T: 23.90 RH: 21.56
T: 23.90 RH: 21.52
T: 23.90 RH: 21.48
T: 23.89 RH: 21.48
T: 23.89 RH: 21.48
T: 23.89 RH: 21.45
T: 23.89 RH: 21.36
T: 23.89 RH: 21.36
T: 23.89 RH: 21.29

T: 24.23 RH: 19.21
T: 24.12 RH: 19.22
T: 24.08 RH: 19.23
T: 24.05 RH: 19.59
T: 24.05 RH: 19.49
T: 24.03 RH: 19.45
T: 24.02 RH: 19.59
T: 24.02 RH: 19.70
T: 24.02 RH: 19.68
T: 24.02 RH: 19.64
T: 24.00 RH: 19.65
T: 24.00 RH: 19.67
T: 24.00 RH: 19.65
T: 23.99 RH: 19.59
T: 23.98 RH: 19.55
T: 23.98 RH: 19.54
T: 23.98 RH: 19.56
T: 23.97 RH: 19.66
T: 23.97 RH: 19.75
T: 23.96 RH: 19.81
T: 23.97 RH: 19.88
T: 23.97 RH: 19.87
T: 23.96 RH: 19.81
T: 23.97 RH: 19.75
T: 23.96 RH: 19.69
T: 23.95 RH: 19.68
T: 23.96 RH: 19.64
T: 23.96 RH: 19.59
T: 23.95 RH: 19.55
T: 23.94 RH: 19.52
T: 23.95 RH: 19.50
T: 23.95 RH: 19.52
T: 23.95 RH: 19.65
T: 23.94 RH: 19.84

T: 24.06 RH: 18.84
T: 24.06 RH: 18.85
T: 24.08 RH: 18.85
T: 24.06 RH: 18.85
T: 24.05 RH: 18.86
T: 24.06 RH: 18.85
T: 24.08 RH: 18.84
T: 24.05 RH: 18.81
T: 24.04 RH: 18.81
T: 24.05 RH: 18.80
T: 24.04 RH: 18.78
T: 24.05 RH: 18.76
T: 24.04 RH: 18.76
T: 24.04 RH: 18.78
T: 24.05 RH: 18.79
T: 24.05 RH: 18.83
T: 24.04 RH: 18.91
T: 24.05 RH: 18.95
T: 24.05 RH: 19.03
T: 24.04 RH: 19.07
T: 24.04 RH: 19.10
T: 24.04 RH: 19.13
T: 24.05 RH: 19.13
T: 24.04 RH: 19.10
T: 24.05 RH: 19.06
T: 24.04 RH: 19.02
T: 24.04 RH: 18.98
T: 24.03 RH: 19.02
T: 24.02 RH: 19.10
T: 24.04 RH: 19.10
T: 24.03 RH: 19.07
T: 24.03 RH: 19.07
T: 24.03 RH: 19.07
T: 24.03 RH: 19.08

t: 24.00 RH: 23.30
t: 24.00 RH: 23.30
t: 23.90 RH: 23.90
t: 23.90 RH: 23.90
t: 24.00 RH: 23.90
t: 24.00 RH: 23.90
t: 24.00 RH: 23.90
t: 24.00 RH: 23.90
t: 23.90 RH: 23.80
t: 23.90 RH: 23.80
t: 24.00 RH: 23.80
t: 24.00 RH: 23.80
t: 24.00 RH: 23.80
t: 24.00 RH: 23.80
t: 24.00 RH: 23.80
t: 24.00 RH: 23.80
t: 24.00 RH: 23.70
t: 24.00 RH: 23.70
t: 24.00 RH: 23.70
t: 24.00 RH: 23.70
t: 24.00 RH: 23.70
t: 24.00 RH: 23.70
t: 24.00 RH: 23.70
t: 24.00 RH: 23.70
t: 23.90 RH: 23.60
t: 23.90 RH: 23.60
t: 24.00 RH: 23.70
t: 24.00 RH: 23.70
t: 24.00 RH: 23.60
t: 24.00 RH: 23.60
t: 24.00 RH: 23.60
t: 24.00 RH: 23.60
t: 24.00 RH: 23.60
t: 24.00 RH: 23.60

t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00
t: 24.70 RH: 11.00


Code test with LCD

Si7021 sensor test using UNO with LCD 
#include "Adafruit_Si7021.h"
#include <LiquidCrystal.h>


//Declare           RS, E,  D4, D5, D6, D7
LiquidCrystal lcd(  3,  5,  6,  9,  10, 11);

Adafruit_Si7021 sensor = Adafruit_Si7021();

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);

  // wait for serial port to open
  while (!Serial) {
    delay(10);
  }

  //Initialize the LCD Display
  lcd.begin(16, 2);
  //Print temperature label
  lcd.setCursor(0,0);
  lcd.write("TEMP(C): ");
  
  //Print Humidity label
  lcd.setCursor(0,1);
  lcd.write("%RH : ");

  Serial.println("Si7021 test!");
  
  if (!sensor.begin()) {
    Serial.println("Did not find Si7021 sensor!");
  //  while (true)
      ;
  }

  Serial.print("Found model ");
  switch(sensor.getModel()) {
    case SI_Engineering_Samples:
      Serial.print("SI engineering samples"); break;
    case SI_7013:
      Serial.print("Si7013"); break;
    case SI_7020:
      Serial.print("Si7020"); break;
    case SI_7021:
      Serial.print("Si7021"); break;
    case SI_UNKNOWN:
    default:
      Serial.print("Unknown");
  }
  Serial.print(" Rev(");
  Serial.print(sensor.getRevision());
  Serial.print(")");
  Serial.print(" Serial #"); Serial.print(sensor.sernum_a, HEX); Serial.println(sensor.sernum_b, HEX);
}

void loop() {
  // put your main code here, to run repeatedly:
  float humidity = sensor.readHumidity();
  float temperature = sensor.readTemperature();
  Serial.print("t: ");
  Serial.print(temperature, 2);
  lcd.setCursor(9,0);
  lcd.print(temperature);  
  Serial.print("  H: ");
  Serial.println(humidity, 2);
  lcd.setCursor(6,1);
  lcd.print(humidity);
  delay(1000);
}

Example output

Si7021 test!
Found model Si7021 Rev(2) Serial #FA30C12615B5FFFF
t: 23.65 H: 30.99
t: 23.67 H: 31.09
t: 23.64 H: 30.96
t: 23.65 H: 30.95
t: 23.68 H: 30.82
t: 23.67 H: 31.03

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