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#include <16F887.h> |
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#include "main.h" |
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#device adc=8 |
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#FUSES NOWDT //No Watch Dog Timer |
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#FUSES INTRC //Internal RC Osc |
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void SHT25_soft_reset() |
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#FUSES NOPUT //No Power Up Timer |
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#FUSES MCLR //Master Clear pin enabled |
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#FUSES NOPROTECT //Code not protected from reading |
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{ |
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#FUSES NOCPD //No EE protection |
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i2c_start(); // Start condition |
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#FUSES NOBROWNOUT //No brownout reset |
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i2c_write(0x80); // Device address |
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#FUSES IESO //Internal External Switch Over mode enabled |
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#FUSES FCMEN //Fail-safe clock monitor enabled |
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#FUSES NOLVP //No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O |
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#FUSES NODEBUG //No Debug mode for ICD |
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i2c_write(0xFE); // Device command |
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#FUSES NOWRT //Program memory not write protected |
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#FUSES BORV40 //Brownout reset at 4.0V |
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i2c_stop(); // Stop condition |
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} |
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unsigned int8 SHT25_setup() |
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{ |
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unsigned int8 reg; |
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i2c_start(); // Start condition |
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i2c_write(0x80); // Device address |
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i2c_write(0xE7); // Device command |
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// i2c_stop(); // Stop condition |
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i2c_start(); // Start condition |
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i2c_write(0x81); // Device address |
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reg=i2c_read(0); // Device command |
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i2c_stop(); // Stop condition |
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return (reg); |
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} |
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float SHT25_get_temp() |
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{ |
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unsigned int8 MSB, LSB, Check; |
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unsigned int16 data; |
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i2c_start(); |
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I2C_Write(0x80); |
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I2C_write(0xE3); |
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i2c_stop(); |
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delay_ms(100); |
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i2c_start(); |
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I2C_Write(0x81); |
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MSB=i2c_read(1); |
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LSB=i2c_read(1); |
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Check=i2c_read(0); |
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i2c_stop(); |
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printf("%X %X %X\r\n",MSB, LSB, Check); |
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LSB = LSB >> 2; // trow out status bits |
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data = (((unsigned int16) MSB << 8) + (LSB << 4)); |
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return(-46.85 + 175.72*((float)data/0xFFFF)); |
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} |
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float SHT25_get_hum() |
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{ |
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unsigned int8 MSB, LSB, Check; |
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unsigned int16 data; |
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i2c_start(); //RH |
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I2C_Write(0x80); |
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I2C_write(0xE5); |
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// i2c_stop(); |
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delay_ms(100); |
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i2c_start(); |
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I2C_Write(0x81); |
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MSB=i2c_read(1); |
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LSB=i2c_read(1); |
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Check=i2c_read(0); |
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i2c_stop(); |
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printf("%X %X %X\r\n",MSB, LSB, Check); |
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LSB = LSB >> 2; // trow out status bits |
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data = (((unsigned int16) MSB << 8) + (LSB << 4) ); |
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return( -6.0 + 125.0*((float)data/0xFFFF)); |
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} |
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void main() |
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{ |
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setup_adc_ports(NO_ANALOGS|VSS_VDD); |
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setup_adc(ADC_CLOCK_DIV_2); |
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setup_spi(SPI_SS_DISABLED); |
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setup_timer_0(RTCC_INTERNAL|RTCC_DIV_1); |
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setup_timer_1(T1_DISABLED); |
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setup_timer_2(T2_DISABLED,0,1); |
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setup_ccp1(CCP_OFF); |
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setup_comparator(NC_NC_NC_NC); |
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void SHT25_soft_reset(); |
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printf("SHT25 humidity and temperature sensor example \r\n",); |
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delay_ms (500); |
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while(TRUE) |
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{ |
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printf("setup: %X \r\n",SHT25_setup()); |
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delay_ms (500); |
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printf("Temp: %f \r\n",SHT25_get_temp()); |
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delay_ms (500); |
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printf("Hum: %f \r\n",SHT25_get_hum()); |
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#use delay(clock=8000000) |
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delay_ms (1000); |
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} |
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} |
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