Maxim Integrated / Mbed OS MAX6613_Low_Power_Temperature_Sensor

Sample source code for the MAX6613. The MAX6613 is a low-power analog output temperature sensor in a tiny 5-pin SC70 package. The supply current usage for the MAX6613 is typically 7.5µA.

Dependencies:   max32630fthr USBDevice

main.cpp@0:a9f350f894e7, 2019-04-22 (annotated)

Committer:
phonemacro
Date:
Mon Apr 22 21:23:39 2019 +0000
Revision:
0:a9f350f894e7
Child:
1:9b9c2989d4eb
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
phonemacro 0:a9f350f894e7 1 #include "mbed.h"
phonemacro 0:a9f350f894e7 2 #include "max32630fthr.h"
phonemacro 0:a9f350f894e7 3 #include "USBSerial.h"
phonemacro 0:a9f350f894e7 4
phonemacro 0:a9f350f894e7 5 MAX32630FTHR pegasus(MAX32630FTHR::VIO_3V3);
phonemacro 0:a9f350f894e7 6
phonemacro 0:a9f350f894e7 7 // Hardware serial port over DAPLink
phonemacro 0:a9f350f894e7 8 Serial daplink(P2_1, P2_0);
phonemacro 0:a9f350f894e7 9
phonemacro 0:a9f350f894e7 10 // Virtual serial port over USB
phonemacro 0:a9f350f894e7 11 USBSerial microUSB;
phonemacro 0:a9f350f894e7 12
phonemacro 0:a9f350f894e7 13 DigitalOut rLED(LED1);
phonemacro 0:a9f350f894e7 14 DigitalOut gLED(LED2);
phonemacro 0:a9f350f894e7 15 DigitalOut bLED(LED3);
phonemacro 0:a9f350f894e7 16
phonemacro 0:a9f350f894e7 17 /* Analog inputs 0 and 1 have internal dividers to allow measuring 5V signals
phonemacro 0:a9f350f894e7 18 * The dividers are selected by using inputs AIN_4 and AIN_5 respectively.
phonemacro 0:a9f350f894e7 19 * The full scale range for AIN0-3 is 1.2V
phonemacro 0:a9f350f894e7 20 * The full scale range for AIN4-5 is 6.0V
phonemacro 0:a9f350f894e7 21 */
phonemacro 0:a9f350f894e7 22 AnalogIn ain1(AIN_5);
phonemacro 0:a9f350f894e7 23 const float AIN5_FSV = 6.0f; /* Full scale value for AIN5 */
phonemacro 0:a9f350f894e7 24
phonemacro 0:a9f350f894e7 25 float max6613_celsius_to_fahrenheit(float temp_c)
phonemacro 0:a9f350f894e7 26 {
phonemacro 0:a9f350f894e7 27 float temp_f;
phonemacro 0:a9f350f894e7 28 temp_f = ((temp_c * 9)/5) + 32;
phonemacro 0:a9f350f894e7 29 return temp_f;
phonemacro 0:a9f350f894e7 30 }
phonemacro 0:a9f350f894e7 31 // main() runs in its own thread in the OS
phonemacro 0:a9f350f894e7 32 // (note the calls to Thread::wait below for delays)
phonemacro 0:a9f350f894e7 33 /**
phonemacro 0:a9f350f894e7 34 * @brief Sample main program for MAX6613
phonemacro 0:a9f350f894e7 35 * @version 1.0000.0000
phonemacro 0:a9f350f894e7 36 *
phonemacro 0:a9f350f894e7 37 * @details Sample main program for MAX6613
phonemacro 0:a9f350f894e7 38 * The prints are sent to the terminal window (9600, 8n1).
phonemacro 0:a9f350f894e7 39 * The program sets the GPIOs to 3.3V and the program
phonemacro 0:a9f350f894e7 40 * configures the chip and reads temperatures.
phonemacro 0:a9f350f894e7 41 * To run the program, drag and drop the .bin file into the
phonemacro 0:a9f350f894e7 42 * DAPLINK folder. After it finishes flashing, cycle the power or
phonemacro 0:a9f350f894e7 43 * reset the Pegasus (MAX32630FTHR) after flashing by pressing the button on
phonemacro 0:a9f350f894e7 44 * the Pegasus next to the battery connector or the button
phonemacro 0:a9f350f894e7 45 * on the MAXREFDES100HDK.
phonemacro 0:a9f350f894e7 46 */
phonemacro 0:a9f350f894e7 47 int main()
phonemacro 0:a9f350f894e7 48 {
phonemacro 0:a9f350f894e7 49 float temperature;
phonemacro 0:a9f350f894e7 50 uint32_t i;
phonemacro 0:a9f350f894e7 51 const float A = -0.00000225f;
phonemacro 0:a9f350f894e7 52 const float B = -0.01105f;
phonemacro 0:a9f350f894e7 53 const float C1 = 1.8455f;
phonemacro 0:a9f350f894e7 54 float c2;
phonemacro 0:a9f350f894e7 55 microUSB.printf("micro USB serial port\r\n");
phonemacro 0:a9f350f894e7 56 rLED = LED_OFF;
phonemacro 0:a9f350f894e7 57 gLED = LED_ON;
phonemacro 0:a9f350f894e7 58 bLED = LED_OFF;
phonemacro 0:a9f350f894e7 59
phonemacro 0:a9f350f894e7 60 rLED = LED_OFF;
phonemacro 0:a9f350f894e7 61 temperature = (float)((1.8455f - (AIN5_FSV * ain1)) / 0.01123f);
phonemacro 0:a9f350f894e7 62 // daplink.printf("AIN1: %1.5f\n", (AIN5_FSV * ain1) ); // analog inputs 1
phonemacro 0:a9f350f894e7 63
phonemacro 0:a9f350f894e7 64 daplink.printf("Temperature using Linear Approximation\r\n");
phonemacro 0:a9f350f894e7 65 for (i = 0; i < 8; i++) {
phonemacro 0:a9f350f894e7 66 temperature = (float)((1.8455f - (AIN5_FSV * ain1)) / 0.01123f);
phonemacro 0:a9f350f894e7 67 daplink.printf("temperature: %3.1f degrees C C, %3.1f degrees F\r\n", temperature, max6613_celsius_to_fahrenheit(temperature));
phonemacro 0:a9f350f894e7 68 wait(2);
phonemacro 0:a9f350f894e7 69 }
phonemacro 0:a9f350f894e7 70 daplink.printf("\r\n");
phonemacro 0:a9f350f894e7 71
phonemacro 0:a9f350f894e7 72 daplink.printf("Temperature using the Quadratic Equation\r\n");
phonemacro 0:a9f350f894e7 73 for (i = 0; i < 8; i++) {
phonemacro 0:a9f350f894e7 74 c2 = AIN5_FSV * ain1;
phonemacro 0:a9f350f894e7 75 temperature = (-B - sqrt(B*B - 4*A*(C1-c2)))/(2*A);
phonemacro 0:a9f350f894e7 76 daplink.printf("temperature: %3.1f degrees C C, %3.1f degrees F\r\n", temperature, max6613_celsius_to_fahrenheit(temperature));
phonemacro 0:a9f350f894e7 77 wait(2);
phonemacro 0:a9f350f894e7 78 }
phonemacro 0:a9f350f894e7 79
phonemacro 0:a9f350f894e7 80 daplink.printf("\r\n");
phonemacro 0:a9f350f894e7 81
phonemacro 0:a9f350f894e7 82 while(1) {
phonemacro 0:a9f350f894e7 83 gLED = !gLED;
phonemacro 0:a9f350f894e7 84 wait(0.5);
phonemacro 0:a9f350f894e7 85 }
phonemacro 0:a9f350f894e7 86 }
phonemacro 0:a9f350f894e7 87