Skip navigation
> RoadTest Reviews

PMODTMP2 Temperature Sensor and Thermostat Control - Review

Scoring

Product Performed to Expectations: 10
Specifications were sufficient to design with: 10
Demo Software was of good quality: 10
Product was easy to use: 10
Support materials were available: 10
The price to performance ratio was good: 10
TotalScore: 60 / 60
  • RoadTest: PMODTMP2 Temperature Sensor and Thermostat Control
  • Buy Now
  • Evaluation Type: Independent Products
  • Was everything in the box required?: Yes

  • Detailed Review:

    Introduction

     

    The Digilent Pmod TMP2 (Revision B) is a temperature module allowing users to detect ambient temperatures ranging from -40 °C to 150 °C.

    Features

    • 16-bit ambient temperature sensor
    • Typical accuracy better that 0.25 ºC
    • 240 ms continuous conversion time
    • Programmable over and under-temperature control pins
    • No calibration required
    • 2×4-pin connector with I2C interface

     

    The Pmod TMP2 utilizes the Analog Devices ADT7420. Users may measure the ambient temperature at a default resolution of 0.0625 °C

     

    I²C Address Selection

     

    I²C Addresses
    JP2JP1Device Address
    OpenOpen0x4B (0b10001011)
    OpenShorted0x4A (0b1001010)
    ShortedOpen0x49 (0b1001001)
    ShortedShorted0x48 (0b1001000)

     

     

    Pinout Description Table

     

    Header J1Jumper Blocks
    PinSignalDescriptionJumper BlockStateDescription
    1 & 5SCLSerial ClockJP1Open/ShortedAddress bit 0 high/low
    2 & 6SDASerial DataJP2Open/ShortedAddress bit 1 high/low
    3 & 7GNDPower Supply GroundUser Outputs
    4 & 8VCCPositive Power SupplyHeader NamePin NameDescription
    J2CTCritical Threshold Output
    J3INTInterrupt Output

     

     

     

     

    Test Setup

     

     

    Example Code

     

    /************************************************************************
    *
    * Test of Pmod TMP2
    *
    *************************************************************************
    * Description: Pmod_TMP2
    * The ambient temperature is displayed on the serial monitor.
    * 
    ************************************************************************/
    
    
    #include  // call library
    #define ADT7420_Address 0x4B // I2C address of the Pmod TMP2
    
    
    int MSB;
    int LSB;
    int value;
    float temperature;
    
    
    void setup()
    {
     Serial.begin(9600); // initialization of serial communication
     Wire.begin(); // initialization of I2C communication
     Init_ADT7420(); // initialization of Pmod TMP2 module 
    }
    
    
    void loop()
    {
     Wire.beginTransmission(ADT7420_Address); // Begin measurement
      Wire.endTransmission();
     delay(10);
     Wire.requestFrom(ADT7420_Address, 2); // Recovery of the two bytes MSB and LSB
     if(Wire.available() <=2)
     {
      MSB = Wire.read();
      LSB = Wire.read();
     }
     value=(MSB<<8)|LSB ;
     if (((value>>15)&1)==0) // If the temperature is positive
     {
      temperature=value/128.0;
     }
     else // If the temperature is negative
     {
      temperature=(value-65535)/128.0;
     }
     Serial.print("MSB="); // display in serial monitor
     Serial.println(MSB);
     Serial.print("LSB=");
     Serial.println(LSB);
     Serial.print("Value=");
     Serial.println(value);
     Serial.print("Temperature=");
     Serial.print(temperature);
     Serial.println(" C");
     Serial.println();
     delay(3000);
    }
    
    
    // Initialization of Pmod TMP2 module
    void Init_ADT7420(void)
    {
    // Configuring the ADT7420 in 16 bit mode
     Wire.beginTransmission(ADT7420_Address);
     Wire.write(0x03);
     Wire.write(0x80);
     Wire.endTransmission();
    }

     

    Code Execution

     

     

    Conclusion

     

    The Pmod series of modules are nice easy way to interface a wide variety of devices to your microcontroller project.

    They cover SPI, I2C, GPIO and UART and conform to Digilents Pmod interface standard.

    While most development board do not come with a Pmod connector, it's easy enough to wire one up.

    The TMP2 module seems to be a very accurate and capable module.


Comments

Also Enrolling

Enrollment Closes: Aug 13 
Enroll
Enrollment Closes: Sep 15 
Enroll
Enrollment Closes: Sep 8 
Enroll
Enrollment Closes: Aug 21 
Enroll
Enrollment Closes: Aug 28 
Enroll
Enrollment Closes: Aug 25 
Enroll
Enrollment Closes: Aug 18 
Enroll
Enrollment Closes: Aug 18 
Enroll
Enrollment Closes: Aug 17 
Enroll