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| 1 | +#include <Wire.h> |
| 2 | +// register pointers for various device functions |
| 3 | +#define DEV_ADDR 0x66 |
| 4 | +#define RESOLUTION 0.0625 |
| 5 | + |
| 6 | +enum MCP9600_Register { |
| 7 | + HOT_JUNC_TEMP = 0x00, |
| 8 | + DELTA_JUNCT_TEMP = 0x01, |
| 9 | + COLD_JUNC_TEMP = 0x02, |
| 10 | + STATUS = 0x04, |
| 11 | + THERMO_SENSOR_CONFIG = 0x05, |
| 12 | + DEVICE_CONFIG = 0x06, |
| 13 | + DEVICE_ID = 0x20, |
| 14 | +}; |
| 15 | + |
| 16 | +uint8_t readSingleRegister(MCP9600_Register reg){ |
| 17 | + Wire.beginTransmission(DEV_ADDR); |
| 18 | + Wire.write(reg); |
| 19 | + Wire.endTransmission(); |
| 20 | + Wire.requestFrom(DEV_ADDR, 1); |
| 21 | + |
| 22 | + if(Wire.available()){ |
| 23 | + uint8_t data = Wire.read(); |
| 24 | + Wire.endTransmission(); |
| 25 | + return data; |
| 26 | + } |
| 27 | + |
| 28 | + else{ |
| 29 | + return 0; |
| 30 | + } |
| 31 | +} |
| 32 | + |
| 33 | +uint16_t readDoubleRegister(MCP9600_Register reg){ |
| 34 | + Wire.beginTransmission(DEV_ADDR); |
| 35 | + Wire.write(reg); |
| 36 | + Wire.endTransmission(); |
| 37 | + Wire.requestFrom(DEV_ADDR, 2); |
| 38 | + |
| 39 | + while(!(Wire.available() < 2)){ |
| 40 | + uint16_t data = Wire.read() << 8; |
| 41 | + data |= Wire.read(); |
| 42 | + Wire.endTransmission(); |
| 43 | + return data; |
| 44 | + } |
| 45 | +} |
| 46 | + |
| 47 | +uint16_t getDeviceID(){ |
| 48 | + return readDoubleRegister(DEVICE_ID); |
| 49 | +} |
| 50 | + |
| 51 | +int16_t getDelta(){ |
| 52 | + Wire.beginTransmission(DEV_ADDR); |
| 53 | + Wire.write(DELTA_JUNCT_TEMP); |
| 54 | + Wire.endTransmission(); |
| 55 | + Wire.requestFrom(DEV_ADDR, 2); |
| 56 | + |
| 57 | + while(!(Wire.available() < 2)){ |
| 58 | + int16_t data = Wire.read() << 8; |
| 59 | + data |= Wire.read(); |
| 60 | + Wire.endTransmission(); |
| 61 | + return data; |
| 62 | + } |
| 63 | +} |
| 64 | + |
| 65 | +void setup() { |
| 66 | + Wire.begin(); |
| 67 | + Serial.begin(115200); |
| 68 | + Wire.beginTransmission(DEV_ADDR); |
| 69 | + |
| 70 | + //make sure the device will ack |
| 71 | + if(Wire.endTransmission() != 0){ |
| 72 | + Serial.println("Device Setup Failed"); |
| 73 | + while(1); |
| 74 | + } |
| 75 | + |
| 76 | + else{ |
| 77 | + Serial.print("Device setup okay"); |
| 78 | + } |
| 79 | +} |
| 80 | + |
| 81 | +void loop() { |
| 82 | + uint16_t hot = readDoubleRegister(HOT_JUNC_TEMP); |
| 83 | + uint16_t cold = readDoubleRegister(COLD_JUNC_TEMP); |
| 84 | + uint16_t delta = getDelta(); |
| 85 | + Serial.print("Device ID: "); |
| 86 | + Serial.print(getDeviceID(), BIN); |
| 87 | + Serial.print(" Hot Junction: "); |
| 88 | + Serial.print(hot); |
| 89 | + Serial.print(" ("); |
| 90 | + Serial.print((float)hot*RESOLUTION); |
| 91 | + Serial.print(" °C) Cold Junction: "); |
| 92 | + Serial.print(cold); |
| 93 | + Serial.print(" ("); |
| 94 | + Serial.print(cold*RESOLUTION); |
| 95 | + Serial.print(" °C) Delta Junction: "); |
| 96 | + Serial.print(delta); |
| 97 | + Serial.print(" ("); |
| 98 | + Serial.print((float)delta*RESOLUTION); |
| 99 | + Serial.print(" °C)"); |
| 100 | + Serial.println(); |
| 101 | + delay(10); |
| 102 | +} |
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