Morgan Du / Mbed OS Click-Sensor-MAX31875

Read the MAX31875 sensor on Thermo 6 Click installed on NuMaker-IoT-M487 board

Dependencies:   MAX31875_Temperature_Sensor_Low_Power

main.cpp@1:ab8e1135d0c4, 2020-08-20 (annotated)

Committer:
morgandu
Date:
Thu Aug 20 02:17:10 2020 +0000
Revision:
1:ab8e1135d0c4
Parent:
0:c40fe84a8d1f 
Replace deprecated "wait()" with "ThisThread::wait_for()" to prevent warning and error on MbedOS 5 and 6

Who changed what in which revision?

UserRevisionLine numberNew contents of line
morgandu 0:c40fe84a8d1f 1 /*
morgandu 0:c40fe84a8d1f 2 * Copyright (c) 2019 Nuvoton Tecnology Corp. All rights reserved.
morgandu 0:c40fe84a8d1f 3 *
morgandu 0:c40fe84a8d1f 4 * This example uses MAX31875 library to read Thermo 6 Click
morgandu 0:c40fe84a8d1f 5 * (MAX31875 temperature sensor) which placed on mikroBUS of
morgandu 0:c40fe84a8d1f 6 * Nuvoton NuMaker-IoT-M487 board.
morgandu 0:c40fe84a8d1f 7 *
morgandu 0:c40fe84a8d1f 8 */
morgandu 0:c40fe84a8d1f 9
morgandu 0:c40fe84a8d1f 10 #include "mbed.h"
morgandu 0:c40fe84a8d1f 11 #include "max31875.h"
morgandu 0:c40fe84a8d1f 12 #include "max31875_cpp.h"
morgandu 0:c40fe84a8d1f 13
morgandu 0:c40fe84a8d1f 14 /* Declare the I2C of mikroBUS on board */
morgandu 0:c40fe84a8d1f 15 I2C mikro_i2c(PG_3, PG_2);
morgandu 0:c40fe84a8d1f 16
morgandu 0:c40fe84a8d1f 17 /* Declare the MAX31875 sensor */
morgandu 0:c40fe84a8d1f 18 MAX31875 temp_sensor(mikro_i2c, MAX31875_I2C_SLAVE_ADR_R0);
morgandu 0:c40fe84a8d1f 19
morgandu 0:c40fe84a8d1f 20 int main()
morgandu 0:c40fe84a8d1f 21 {
morgandu 0:c40fe84a8d1f 22 float f_temperature;
morgandu 0:c40fe84a8d1f 23
morgandu 0:c40fe84a8d1f 24 printf("\r\nmbed OS version is %d.\r\n", MBED_VERSION);
morgandu 0:c40fe84a8d1f 25 printf("Start to read temperature ...\r\n");
morgandu 0:c40fe84a8d1f 26
morgandu 0:c40fe84a8d1f 27 /* Set frequency of I2C bus to 1MHz */
morgandu 0:c40fe84a8d1f 28 mikro_i2c.frequency(1000000);
morgandu 0:c40fe84a8d1f 29
morgandu 0:c40fe84a8d1f 30 /* Configure temperature sensor for 8 times per second */
morgandu 0:c40fe84a8d1f 31 temp_sensor.write_cfg(MAX31875_CFG_CONV_RATE_8 | MAX31875_CFG_RESOLUTION_12BIT);
morgandu 0:c40fe84a8d1f 32
morgandu 0:c40fe84a8d1f 33 while(true)
morgandu 0:c40fe84a8d1f 34 {
morgandu 0:c40fe84a8d1f 35 /* It should wait at least 1/8 seconds for next read */
morgandu 1:ab8e1135d0c4 36 //wait(MAX31875_WAIT_CONV_RATE_8);
morgandu 1:ab8e1135d0c4 37
morgandu 0:c40fe84a8d1f 38 /* But to slow print out rate, wait 1 second here */
morgandu 1:ab8e1135d0c4 39 #if MBED_MAJOR_VERSION >= 6
morgandu 1:ab8e1135d0c4 40 ThisThread::sleep_for(1s);
morgandu 1:ab8e1135d0c4 41 #else
morgandu 1:ab8e1135d0c4 42 ThisThread::sleep_for(1000);
morgandu 1:ab8e1135d0c4 43 #endif
morgandu 0:c40fe84a8d1f 44
morgandu 0:c40fe84a8d1f 45 f_temperature = temp_sensor.read_reg_as_temperature(MAX31875_REG_TEMPERATURE);
morgandu 0:c40fe84a8d1f 46 printf("Temperature is %3.4f Celsius, %3.4f Fahrenheit\r\n",
morgandu 0:c40fe84a8d1f 47 f_temperature,
morgandu 0:c40fe84a8d1f 48 temp_sensor.celsius_to_fahrenheit(f_temperature));
morgandu 0:c40fe84a8d1f 49 }
morgandu 0:c40fe84a8d1f 50
morgandu 0:c40fe84a8d1f 51 }
morgandu 0:c40fe84a8d1f 52