ds1631_temperature.c

#include <math.h>
#include <ModmataC.h>
#define THERMO_ADDR 0X4D
 
int main() {
    // start serial connection with arduino, given a port, baud rate, and id
    connectArduino("/dev/ttyACM0", 115200, 1);
    printf("Arduino connected\n");
    
    wireBegin();
 
    // Read in initial config settings
    uint8_t *config = wireRead(THERMO_ADDR, 0xAC, 1);
    // Modify config settings
    config[1] |= 0x0D;
    wireWrite(THERMO_ADDR, 0xAC, 1, config);
    
    while(1) {
        // Start temperature conversion
        wireWrite(THERMO_ADDR, 0x51, 0, 0);
 
        // Read in temperature bytes
        uint8_t *bytes = wireRead(THERMO_ADDR, 0xAA, 2);
        // printf("%02x %02x\n", bytes[0], bytes[1]);
 
        // Convert bytes to temperature number
        double temperature_c = 0;
        temperature_c += bytes[0];
        for(int i = 0; i < 4; i++) {
            temperature_c += ((bytes[1] >> 4+i) & 0x01) / pow(2, i+1);
        }
        printf("%.04f F\n", temperature_c * 9/5.0 + 32);
 
        // Wait a second until the next sample
        free(bytes);
        delay(1000);
    }
    closeConnection();
    return 0;
}