SEN-13314

Page 1 of 7   TMP102 Digital Temperature Sensor Hookup Guide Introduction The TMP102 is an easy-to-use digital temperature sensor from Texas Instruments. While some temperature sensors use an analog voltage to represent the temperature, the TMP102 uses the I2C bus of the Arduino to communicate the temperature. SparkFun Digital Temperature Sensor Breakout - TMP102  SE N-1331 4 Required Materials To follow along with this hookup guide, you will need the following: TMP102 Hookuo Guide SparkFun Wish List SparkFun Digital Temperature Sensor Breakout - TMP102 SEN-11931 This is a breakout board for the incredibly small TMP102 digital temp… SparkFun RedBoard - Programmed with Arduino DEV-12757 At SparkFun we use many Arduinos and we're always looking for the… Break Away Headers - Straight Page 2 of 7 PRT-00116 A row of headers - break to fit. 40 pins that can be cut to any size.…  Jumper Wires - Connected 6" (M/F, 20 pack)    Suggested Reading Before getting started, you may find the following links useful: • • • • • I2C Protocol Logic Levels Installing an Arduino Library What are Pull-up Resistors? How to use a Breadbaord Board Overview Let’s go over the TMP102 Breakout in detail. TMP102 Details: • • • • Uses the I2C interface 12-bit, 0.0625°C resolution Typical temperature accuracy of ±0.5°C 3.3V sensor - use inline logic level converters or 10 kΩ resistors to limit 5V signals • Supports up to four TMP102 sensors on the I2C bus at a time Pull-up Resistors This breakout board has built-in 4.7 kΩ pull up resistors for I2C communications. If you’re hooking up multiple I2C devices on the same bus, you may want to disable/enable the pull-up resistors for one or more boards. On the TMP102, the pull-ups are enabled by default. To disable them, simply use a hobby knife to cut the traces connecting the left and right pads of the jumper labeled I2C PU on the back of the board. This will disconnect the resistors from VCC and from the I2C bus. Hardware Connections Connecting the TMP102 to an Arduino Wiring the TMP102 is very easy! We recommend soldering six male headers to the breakout board. You can also solder wires to fit your application’s needs. Page 3 of 7 Power This board runs from 1.4V to 3.6V. Be sure to power the board from the 3.3V pin! I2C uses an open drain signaling, so there is no need to use level shifting; the 3.3V signal will work to communicate with the Arduino and will not exceed the maximum voltage rating of the pins on the TMP102. Connections to the Arduino The TMP102 breakout board has six pins, however we’ll only be using five of the pins in today’s example. We’ll be connecting VCC and GND to the normal power pins, two data lines for I2C communication, and one digital pin to see if there is an alert. If you’re using a newer board that has SDA and SCL broken out, you can connect the SDA and SCL pins directly to those pins. If you’re using an older board, SDA and SCL are pins A4 and A5 respectively. • • • • • VCC → 3.3V GND → GND SDA → SDA/A4 SCL → SCL/A5 ALT → A3 This would looks something like this: The only pin that we aren’t using is ADD0, this pin is used to change the address of the TMP102. If you’re using multiple TMP102s or another device that uses that address, you’ll want to use this pin to change the address. The default address is 0x48. You can change the address by cutting the ADD0 jumper on the back of the board and connecting an external jumper wire to the following pins: • VCC → 0x49 • SDA → 0x4A • SCL → 0x4B TMP102 Library and Example Code Note:This example assumes you are using the latest version of the Arduino IDE on your desktop. If this is your first time using Arduino, please review ou tutorial on installing the Arduino IDE. If you have not previously installed an Arduino library, please check out our installation guide. To get started immediately, use the example code and library files below. Page 4 of 7 /************************************************************* *****************  TMP102_example.ino  Example for the TMP102 I2C Temperature Sensor  Alex Wende @ SparkFun Electronics  April 29th 2016  ~  This sketch configures the TMP102 temperature sensor and print s the  temperature and alert state (both from the physical pin, as we ll as by  reading from the configuration register.  Resources:  Wire.h (included with Arduino IDE)  SparkFunTMP102.h  Development environment specifics:  Arduino 1.0+  Hardware Version 13  This code is beerware; if you see me (or any other SparkFun em ployee) at  the local, and you've found our code helpful, please buy us a  round!  Distributed as­is; no warranty is given.     ************************************************************** ****************/ #include  // Used to establied serial communication o n the I2C bus #include "SparkFunTMP102.h" // Used to send and recieve specif ic information from our sensor // Connections // VCC = 3.3V // GND = GND // SDA = A4 // SCL = A5 const int ALERT_PIN = A3; TMP102 sensor0(0x48); // Initialize sensor at I2C address 0x48 // Sensor address can be changed with an external jumper to: // ADD0 ­ Address //  VCC ­ 0x49 //  SDA ­ 0x4A //  SCL ­ 0x4B void setup() {   Serial.begin(9600); // Start serial communication at 9600 ba ud pinMode(ALERT_PIN,INPUT);  // Declare alertPin as an input   sensor0.begin();  // Join I2C bus // Initialize sensor0 settings // These settings are saved in the sensor, even if it loses  power // set the number of consecutive faults before triggering al arm. // 0­3: 0:1 fault, 1:2 faults, 2:4 faults, 3:6 faults.   sensor0.setFault(0);  // Trigger alarm immediately Page 5 of 7 // set the polarity of the Alarm. (0:Active LOW, 1:Active HI GH).   sensor0.setAlertPolarity(1); // Active HIGH // set the sensor in Comparator Mode (0) or Interrupt Mode  (1).   sensor0.setAlertMode(0); // Comparator Mode. // set the Conversion Rate (how quickly the sensor gets a ne w reading) //0­3: 0:0.25Hz, 1:1Hz, 2:4Hz, 3:8Hz   sensor0.setConversionRate(2); //set Extended Mode. //0:12­bit Temperature(­55C to +128C) 1:13­bit Temperature (­55C to +150C)   sensor0.setExtendedMode(0); //set T_HIGH, the upper limit to trigger the alert on   sensor0.setHighTempF(85.0);  // set T_HIGH in F //sensor0.setHighTempC(29.4); // set T_HIGH in C //set T_LOW, the lower limit to shut turn off the alert   sensor0.setLowTempF(84.0);  // set T_LOW in F //sensor0.setLowTempC(26.67); // set T_LOW in C }  void loop() {  float temperature; boolean alertPinState, alertRegisterState; // Turn sensor on to start temperature measurement. // Current consumtion typically ~10uA.   sensor0.wakeup(); // read temperature data   temperature = sensor0.readTempF(); //temperature = sensor0.readTempC(); // Check for Alert   alertPinState = digitalRead(ALERT_PIN); // read the Alert fr om pin   alertRegisterState = sensor0.alert();   // read the Alert fr om register // Place sensor in sleep mode to save power. // Current consumtion typically  T_HIGH until any read operation occurs. Resources and Going Further For more information about the TMP102 Breakout, check out the links below. • • • • TMP102 datasheet TMP102 Breakout Board Schematic TMP102 Breakout Board Eagle Files Github repo containing the latest and greatest files and code. For more sensor fun, check out these other great SparkFun tutorials. ITG-3200 Hookup Guide Learn how to interact with the ITG3200 Triple Axis Gyroscope. MAG3110 Magnetometer Hookup Guide Get started with the MAG3110 3-Axis Magnetometer and learn how to make your own digital compass that senses the Earth's magnetic fields. FLIR Lepton Hookup Guide MPU-9250 Hookup Guide See the invisible world of infrared radiation using the FLIR Dev Kit and Raspberry Pi. Get up and running with the MPU9250 9-axis MEMS sensor. https://learn.sparkfun.com/tutorials/tmp102-digital-temperature-sensor-hookup-guide?_ga=... 3/6/2017