TMP102

Описание

The TMP102 is a two-wire, serial output temperature sensor available in a tiny SOT563 package. Requiring no external components, the TMP102 is capable of reading temperatures to a resolution of 0.0625°C.

The TMP102 features SMBus and two-wire interface compatibility, and allows up to four devices on one bus. It also features an SMB alert function.

The TMP102 is ideal for extended temperature measurement in a variety of communication, computer, consumer, environmental, industrial, and instrumentation applications. The device is specified for operation over a temperature range of –40°C to +125°C.

Note that the TMP102 is a 3.3V device and will require a Logic Level Converter to connect it to a 5V Arduino.

Подключение

The TMP102 is a 3.3V device and therefore it is connected to the Arduino board through a Logic Level Converter:

• LV to the 3.3V pin of the Arduino
• HV to the 5V pin of Arduino
• HV Channel 1 TXO to the SDA pin (analog 4)
• HV Channel 2 TXO to the SCL pin (analog 5)
• Low voltage Channel 1 TXI to the SDA pin of TMP102
• Low voltage Channel 2 TXI to the SCL pin of TMP102
• The RX pins of the Logic Level Converter are not used
• V+ of TMP102 connected to 3.3V
• ADD0 of TMP102 connected to ground
• ALT of TMP102 not connected
• All grounds connected together.

Component side with test overlay:

Пример кода

Пример кода для Arduino который показывает как считать данные с TMP102, преобразовать их в градусы по Цельсии и по Фарингейту. Полученные результаты выводятся на ЖКИ дисплей и дублируются в последовательный порт.

 #include <LiquidCrystal.h>
 #include <Wire.h>
 
 // initialize the library with the numbers of the interface pins
 LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
 
 byte res;
 byte msb;
 byte lsb;
 int val;
 float tC;  // temperature in Celsius
 float tF;  // temperature in Fahrenheit
 
 void setup()
 {
   // set up the LCD's number (col,row): 
   lcd.begin(20, 2);
   lcd.print("Temp");
 
   Serial.begin(9600);
   Wire.begin();
 }
 
 void loop()
 {
   lcd.clear();
   
   /* get new value from TMP102 */
   res = Wire.requestFrom(72,2);
   
   if (res == 2) {
     msb = Wire.receive(); /* Whole degrees */ 
     lsb = Wire.receive(); /* Fractional degrees */ 
     val = ((msb) << 4);   /* MSB */
     val |= (lsb >> 4);    /* LSB */
     
     /* calculate temperature */
     tC = val*0.0625;
     tF = (tC * 9/5) + 32;
     
     /* show temperatures on display */
     lcd.print(tC);
     lcd.print("\xdf""C");
 
     lcd.setCursor(0, 1);
     lcd.print(tF);
     lcd.print("\xdf""F");
 
 
     Serial.print(tC);
     Serial.print("C   ");
     Serial.print(tF);
     Serial.println("F");
 
   }
   else {
     lcd.print("ERR");
     Serial.println("ERROR");
   }
   
   delay(1000);
 }

Материалы

• Источник: TMP102 Wiring
• Описание: TMP102 Datasheet
• Схема отладочной платы: TMP102 Breakout
• Подключение к Arduino(5v) используя преобразователь уровней Sparkfun Logic Level Converter: http://forum.sparkfun.com/viewtopic.php?f=8&t=20938&p=97163
• Где купить Sparkfun, 4Robots и другие.

↑ http://forum.sparkfun.com/viewtopic.php?f=8&t=20938&p=97163