MBED SPI Sensor: How to read AD7904 output

.from: http://mbed.org/forum/mbed/topic/2444/

#include "mbed.h"

DigitalOut cs(p10);
SPI spi(p5, p6, p7);
Serial pc(USBTX, USBRX);

int adc;

int main()
{
    pc.baud(115200);
    pc.format(8,Serial::None,1);

    spi.format(16,3);
    spi.frequency(1000000);

   
    // dump read
    pc.printf("dump read\r\n");
    cs = 0;
    adc = spi.write(0x8300);
    cs = 1;
    pc.printf("ADC = %d\r\n", adc);

    // real reading
    pc.printf("real reading\r\n");
    cs = 0;
    adc = spi.write(0x0000);
    cs = 1;
    pc.printf("ADC = %d\r\n", adc);
}

MBED SPI Sensor: How to read AD7914 output

.from: http://mbed.org/forum/mbed/topic/2444/

#include "mbed.h"

DigitalOut cs(p10);
SPI spi(p5, p6, p7);
Serial pc(USBTX, USBRX);

int adc;

int main()
{
    pc.baud(115200);
    pc.format(8,Serial::None,1);

    spi.format(16,3);
    spi.frequency(1000000);

   
    // dump read
    pc.printf("dump read\r\n");
    cs = 0;
    adc = spi.write(0x8300);
    cs = 1;
    pc.printf("ADC = %d\r\n", adc);

    // real reading
    pc.printf("real reading\r\n");
    cs = 0;
    adc = spi.write(0x0000);
    cs = 1;
    pc.printf("ADC = %d\r\n", adc);
}

MBED Example: How to read MaxSonar EZ1 using mbed AnalogIn

.from: http://mbed.org/users/shimniok/programs/MaxSonar_EZ1_Analog/llju06

#include "mbed.h"

// MaxSonar EZ1 test program
// by Michael Shimniok http://www.bot-thoughts.com/
//
// Based on datasheet here: http://www.maxbotix.com/uploads/LV-MaxSonar-EZ1-Datasheet.pdf
// Reads from AN (analog) pin connected to mbed p20, assumes 3.3V supply to EZ1 module.
//
// mbed -> EZ1
// -----------
// VOUT -> +5
// GND  -> GND
// p20  -> AN
//

AnalogIn ain(p20);
Serial pc(USBTX, USBRX); // tx, rx

int main() {
    float adc, volts, inches;
    int feet, in;
   
    pc.baud(115200);
   
    while (1){
        adc = ain.read();           // read analog as a float
        volts = adc * 3.3;          // convert to volts
        inches = volts / 0.0064;    // 3.3V supply: 6.4mV per inch
        feet = (int) inches / 12;   // inches to feet (trunc)
        in = (int) inches % 12;     // remainder -> in(ches)
       
        pc.printf("%8.2f adc %8.2fV %8.2f in %d'%d\"\n", adc, volts, inches, feet, in);

        wait(0.05);                 // 20Hz update rate ; note we aren't truly synchronized to the device or anything...  
    }
}