Example Code for a TMP102 I2c Thermometer————Arduino
参考:https://playground.arduino.cc/Code/TMP102/
Example Code for a TMP102 I2c Thermometer
I've fairly extensively commented the code, hopefully it makes sense.
Example code for talking to a TMP102 I2C thermometer, like those available from Sparkfun, for example. Rather heavily based on some code I found in the forums, some samples, and a bit of personal investigation to make it all work.
Based on my testing, the sensor overreads by around 5 degrees C at room temperature. Not too sure if it is a percentage or a constant error. I know some of the analogue sensors are prone to incorrect readings if the reference voltages are off, but as we're using a digital output, this shouldn't affect it. Any ideas? Mention them here.
For those using the Sparkfun logic converters with I2C, here are the pin connections:
- Low voltage to the 3.3v pin of the Arduino
- High voltage to the 5.0v pin
- High voltage Channel 1 Txo to the SDA pin (analog 4)
- High voltage 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 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.
You can instead use resistors to voltage divide the signal lines, but I've not figured out how to do that yet.
- #include "Wire.h"
- #define TMP102_I2C_ADDRESS 72 /* This is the I2C address for our chip.
- This value is correct if you tie the ADD0 pin to ground. See the datasheet for some other values. */
- void setup() {
- Wire.begin(); // start the I2C library
- Serial.begin(115200); //Start serial communication at 115200 baud
- }
- void getTemp102(){
- byte firstbyte, secondbyte; //these are the bytes we read from the TMP102 temperature registers
- int val; /* an int is capable of storing two bytes, this is where we "chuck" the two bytes together. */
- float convertedtemp; /* We then need to multiply our two bytes by a scaling factor, mentioned in the datasheet. */
- float correctedtemp;
- // The sensor overreads (?)
- /* Reset the register pointer (by default it is ready to read temperatures)
- You can alter it to a writeable register and alter some of the configuration -
- the sensor is capable of alerting you if the temperature is above or below a specified threshold. */
- Wire.beginTransmission(TMP102_I2C_ADDRESS); //Say hi to the sensor.
- Wire.send(0x00);
- Wire.endTransmission();
- Wire.requestFrom(TMP102_I2C_ADDRESS, 2);
- Wire.endTransmission();
- firstbyte = (Wire.receive());
- /*read the TMP102 datasheet - here we read one byte from
- each of the temperature registers on the TMP102*/
- secondbyte = (Wire.receive());
- /*The first byte contains the most significant bits, and
- the second the less significant */
- val = ((firstbyte) << 4);
- /* MSB */
- val |= (secondbyte >> 4);
- /* LSB is ORed into the second 4 bits of our byte.
- Bitwise maths is a bit funky, but there's a good tutorial on the playground*/
- convertedtemp = val*0.0625;
- correctedtemp = convertedtemp - 5;
- /* See the above note on overreading */
- Serial.print("firstbyte is ");
- Serial.print("\t");
- Serial.println(firstbyte, BIN);
- Serial.print("secondbyte is ");
- Serial.print("\t");
- Serial.println(secondbyte, BIN);
- Serial.print("Concatenated byte is ");
- Serial.print("\t");
- Serial.println(val, BIN);
- Serial.print("Converted temp is ");
- Serial.print("\t");
- Serial.println(val*0.0625);
- Serial.print("Corrected temp is ");
- Serial.print("\t");
- Serial.println(correctedtemp);
- Serial.println();
- }
- void loop() {
- getTemp102();
- delay(5000); //wait 5 seconds before printing our next set of readings.
- }
Comments
val = firstbyte;
if ((firstbyte & 0x80) > 0) {
val |= 0x0F00;
}
val <<= 4;
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