3-Wire Serial SPI Temperature Sensor (MAX6629) with an Arduino Uno

hi,

i have brought max6629 spi sensor found here:

https://datasheets.maximintegrated.com/en/ds/max6629-max6632.pdf

i have hooked vcc, gnd, miso (arduino) (max6629), pin 10 (arduino) cs, , sck.

the code have uploaded arduino uno shown below. not getting out? if take @ datasheet, can see 16 bits used, code reading right?

code: [select]


#include <spi.h>

double readcelsius(uint8_t cs) {
    uint16_t v;

    digitalwrite(cs, low);
    v = spi.transfer(0x00);
    v <<= 8;
    v |= spi.transfer(0x00);
    digitalwrite(cs, high);

    if (v & 0x4) {
        return nan;
    }

    v >>= 3;

    return v*0.25;
}

void setup() {
    spi.begin();
    pinmode(10, output);
    digitalwrite(10, high);
    serial.begin(115200);
}

void loop() {
    serial.print(readcelcius(10));
    serial.print(" ");
    delay(1000);
}


thanks!

quote

i have hooked vcc, gnd, miso (arduino) (max6629), pin 10 (arduino) cs, , sck.

just clarify: sck means pin 13 on arduino side, doesn't it?

quote

however not getting out?

does mean nothing or 0 output?

quote

if take @ datasheet, can see 16 bits used, code reading right?

with exception use unsigned integer instead of signed 1 code looks ok.

Arduino Forum > Using Arduino > Networking, Protocols, and Devices (Moderator: fabioc84) > 3-Wire Serial SPI Temperature Sensor (MAX6629) with an Arduino Uno

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