Arduino and tmp102 - temperature sensor

1#include <Wire.h> // Used to establied serial communication on the I2C  bus
2#include <SparkFunTMP102.h> // Used to send and recieve specific information  from our sensor
3
4// Connections
5// VCC = 3.3V
6// GND = GND
7// SDA  = A4
8// SCL = A5
9const int ALERT_PIN = A3;
10
11TMP102 sensor0;
12
13void  setup() {
14  Serial.begin(115200);
15  Wire.begin(); //Join I2C Bus
16
17  pinMode(ALERT_PIN,INPUT);  // Declare alertPin as an input
18
19  /* The TMP102 uses the default settings  with the address 0x48 using Wire.
20
21     Optionally, if the address jumpers  are modified, or using a different I2C bus,
22     these parameters can be changed  here. E.g. sensor0.begin(0x49,Wire1)
23
24     It will return true on success  or false on failure to communicate. */
25  if(!sensor0.begin())
26  {
27    Serial.println("Cannot  connect to TMP102.");
28    Serial.println("Is the board connected? Is the device  ID correct?");
29    while(1);
30  }
31
32  Serial.println("Connected to TMP102!");
33  delay(100);
34
35  // Initialize sensor0 settings
36  // These settings are  saved in the sensor, even if it loses power
37
38  // set the number of consecutive  faults before triggering alarm.
39  // 0-3: 0:1 fault, 1:2 faults, 2:4 faults,  3:6 faults.
40  sensor0.setFault(0);  // Trigger alarm immediately
41
42  //  set the polarity of the Alarm. (0:Active LOW, 1:Active HIGH).
43  sensor0.setAlertPolarity(1);  // Active HIGH
44
45  // set the sensor in Comparator Mode (0) or Interrupt Mode  (1).
46  sensor0.setAlertMode(0); // Comparator Mode.
47
48  // set the Conversion  Rate (how quickly the sensor gets a new reading)
49  //0-3: 0:0.25Hz, 1:1Hz, 2:4Hz,  3:8Hz
50  sensor0.setConversionRate(2);
51
52  //set Extended Mode.
53  //0:12-bit  Temperature(-55C to +128C) 1:13-bit Temperature(-55C to +150C)
54  sensor0.setExtendedMode(0);
55
56  //set T_HIGH, the upper limit to trigger the alert on
57  sensor0.setHighTempF(82.0);  // set T_HIGH in F
58  //sensor0.setHighTempC(29.4); // set T_HIGH in C
59
60  //set T_LOW, the lower limit to shut turn off the alert
61  sensor0.setLowTempF(81.0);  // set T_LOW in F
62  //sensor0.setLowTempC(26.67); // set T_LOW in C
63}
64
65void  loop()
66{
67  float temperature;
68  boolean alertPinState, alertRegisterState;
69
70  // Turn sensor on to start temperature measurement.
71  // Current consumtion  typically ~10uA.
72  sensor0.wakeup();
73
74  // read temperature data
75  temperature  = sensor0.readTempF();
76  //temperature = sensor0.readTempC();
77
78  // Check  for Alert
79  alertPinState = digitalRead(ALERT_PIN); // read the Alert from pin
80  alertRegisterState = sensor0.alert();   // read the Alert from register
81
82  // Place sensor in sleep mode to save power.
83  // Current consumtion typically  <0.5uA.
84  sensor0.sleep();
85
86  // Print temperature and alarm state
87  Serial.print("Temperature: ");
88  Serial.print(temperature);
89
90  Serial.print("\	Alert  Pin: ");
91  Serial.print(alertPinState);
92
93  Serial.print("\	Alert Register:  ");
94  Serial.println(alertRegisterState);
95
96  delay(1000);  // Wait 1000ms
97}
98