Mitesh Patel
MLX90614 sensor is basically infrared tempararute sensor.It\'s works on I2c protocol
main.cpp@0:5b140ed159a9, 2011-05-04 (annotated)
- Committer:
- mitesh2patel
- Date:
- Wed May 04 05:50:35 2011 +0000
- Revision:
- 0:5b140ed159a9
Who changed what in which revision?
| User | Revision | Line number | New contents of line |
|---|---|---|---|
| mitesh2patel | 0:5b140ed159a9 | 1 | |
| mitesh2patel | 0:5b140ed159a9 | 2 | #include "mbed.h" |
| mitesh2patel | 0:5b140ed159a9 | 3 | |
| mitesh2patel | 0:5b140ed159a9 | 4 | I2C i2c(p28,p27); //sda,scl |
| mitesh2patel | 0:5b140ed159a9 | 5 | Serial pc(USBTX,USBRX); //serial usb config |
| mitesh2patel | 0:5b140ed159a9 | 6 | |
| mitesh2patel | 0:5b140ed159a9 | 7 | char a[5]; |
| mitesh2patel | 0:5b140ed159a9 | 8 | |
| mitesh2patel | 0:5b140ed159a9 | 9 | int main() |
| mitesh2patel | 0:5b140ed159a9 | 10 | { |
| mitesh2patel | 0:5b140ed159a9 | 11 | int p1,p2,p3; //to store adc high and low and PEC(packet error correction) |
| mitesh2patel | 0:5b140ed159a9 | 12 | int ch=0,temp_val; //to store temparature value |
| mitesh2patel | 0:5b140ed159a9 | 13 | i2c.frequency(20000); //I2C frequency 20000hz (20khz) |
| mitesh2patel | 0:5b140ed159a9 | 14 | |
| mitesh2patel | 0:5b140ed159a9 | 15 | |
| mitesh2patel | 0:5b140ed159a9 | 16 | while(1){ |
| mitesh2patel | 0:5b140ed159a9 | 17 | |
| mitesh2patel | 0:5b140ed159a9 | 18 | do{ //loop repeat if repeated start codition is not acknowledge |
| mitesh2patel | 0:5b140ed159a9 | 19 | |
| mitesh2patel | 0:5b140ed159a9 | 20 | do{ //loop repeat if device ram address(reg address where the Tobj value present) condition is not acknowledge |
| mitesh2patel | 0:5b140ed159a9 | 21 | |
| mitesh2patel | 0:5b140ed159a9 | 22 | |
| mitesh2patel | 0:5b140ed159a9 | 23 | |
| mitesh2patel | 0:5b140ed159a9 | 24 | do{ //loop repeat if device address acdition is not acknowledge |
| mitesh2patel | 0:5b140ed159a9 | 25 | pc.printf("add\t"); |
| mitesh2patel | 0:5b140ed159a9 | 26 | i2c.stop(); //stop i2c if not ack |
| mitesh2patel | 0:5b140ed159a9 | 27 | |
| mitesh2patel | 0:5b140ed159a9 | 28 | wait(0.2); |
| mitesh2patel | 0:5b140ed159a9 | 29 | i2c.start(); //start I2C |
| mitesh2patel | 0:5b140ed159a9 | 30 | ch=i2c.write(0x00); //device address of mlxIRtemprature sensorwith write condition |
| mitesh2patel | 0:5b140ed159a9 | 31 | } while(ch==0); //wait for ack |
| mitesh2patel | 0:5b140ed159a9 | 32 | pc.printf("ACK1\t"); |
| mitesh2patel | 0:5b140ed159a9 | 33 | |
| mitesh2patel | 0:5b140ed159a9 | 34 | ch=i2c.write(0x07); //device ram address where Tobj value is present |
| mitesh2patel | 0:5b140ed159a9 | 35 | } while(ch==0); //wait for ack |
| mitesh2patel | 0:5b140ed159a9 | 36 | pc.printf("ACK2\t"); |
| mitesh2patel | 0:5b140ed159a9 | 37 | |
| mitesh2patel | 0:5b140ed159a9 | 38 | |
| mitesh2patel | 0:5b140ed159a9 | 39 | |
| mitesh2patel | 0:5b140ed159a9 | 40 | i2c.start(); //repeat start |
| mitesh2patel | 0:5b140ed159a9 | 41 | ch=i2c.write(0x01); //device address with read condition |
| mitesh2patel | 0:5b140ed159a9 | 42 | }while(ch==0); //wait for ack |
| mitesh2patel | 0:5b140ed159a9 | 43 | pc.printf("ACK3\t"); |
| mitesh2patel | 0:5b140ed159a9 | 44 | p1=i2c.read(1); //Tobj low byte |
| mitesh2patel | 0:5b140ed159a9 | 45 | p2=i2c.read(1); //Tobj heigh byte |
| mitesh2patel | 0:5b140ed159a9 | 46 | p3=i2c.read(0); //PEC |
| mitesh2patel | 0:5b140ed159a9 | 47 | i2c.stop(); //stop condition |
| mitesh2patel | 0:5b140ed159a9 | 48 | |
| mitesh2patel | 0:5b140ed159a9 | 49 | //degree centigrate conversion |
| mitesh2patel | 0:5b140ed159a9 | 50 | temp_val=((((p2&0x007f)<<8)+p1)*0.02)-0.01; |
| mitesh2patel | 0:5b140ed159a9 | 51 | temp_val=temp_val-273; |
| mitesh2patel | 0:5b140ed159a9 | 52 | |
| mitesh2patel | 0:5b140ed159a9 | 53 | |
| mitesh2patel | 0:5b140ed159a9 | 54 | |
| mitesh2patel | 0:5b140ed159a9 | 55 | wait(1.0); |
| mitesh2patel | 0:5b140ed159a9 | 56 | |
| mitesh2patel | 0:5b140ed159a9 | 57 | |
| mitesh2patel | 0:5b140ed159a9 | 58 | pc.printf("rx val1 is %d\n",p1); |
| mitesh2patel | 0:5b140ed159a9 | 59 | pc.printf("rx val2 is %d\n",p2); |
| mitesh2patel | 0:5b140ed159a9 | 60 | pc.printf("rx val3 is %d\n",p3); |
| mitesh2patel | 0:5b140ed159a9 | 61 | pc.printf("temp val is %d\n",temp_val); |
| mitesh2patel | 0:5b140ed159a9 | 62 | |
| mitesh2patel | 0:5b140ed159a9 | 63 | |
| mitesh2patel | 0:5b140ed159a9 | 64 | wait(2.0); |
| mitesh2patel | 0:5b140ed159a9 | 65 | |
| mitesh2patel | 0:5b140ed159a9 | 66 | |
| mitesh2patel | 0:5b140ed159a9 | 67 | |
| mitesh2patel | 0:5b140ed159a9 | 68 | } |
| mitesh2patel | 0:5b140ed159a9 | 69 | |
| mitesh2patel | 0:5b140ed159a9 | 70 | |
| mitesh2patel | 0:5b140ed159a9 | 71 | |
| mitesh2patel | 0:5b140ed159a9 | 72 | return 0; |
| mitesh2patel | 0:5b140ed159a9 | 73 | } |