application: remove MLX90614 because of errounous readings
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README.md
11
README.md
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@ -38,11 +38,14 @@ The top lid of the glass if equipped with the following:
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- a 10 kOhm thermistor in a stainless steel tube, to measure the starter's temperature once plunged into it
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- a HC-SR04 ultrasonic range sensor, to measure the starter's rising
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- a MLX90614 infra-red thermometer, to measure the starter's temperature without contact, as alternative to the thermocouple
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- a n-channel MOSFET, to power the power resistor in the heater
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- a SSD1306 0.96 inch OLED display, to show the starter's temperature and growth
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- a STM32F401-based [WeAct MiniF4](https://github.com/WeActTC/MiniF4-STM32F4x1) development board, to control all peripherals
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The top lid also used to have a MLX90614 IR-thermometer, but the reading were wrong (24 °C instead of 29 °C).
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This might be because of the high humidity when heating up, and droplets are forming on the sensor.
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It can maybe corrected by changing the emissivity, but a thermistor is just the easier solution.
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To use the yeast raiser:
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1. put the lid on the empty glass
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@ -91,12 +94,6 @@ SSD1306 OLED display module:
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1. ground
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2. PA6, pulled to to 3.3V by 10 kOhm resistor
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MLX90614 IR-thermometer:
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1. VIN: 3.3V
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2. GND: ground
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3. SCL: PA8/I2C3_SCL
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4. SDA: PB4/I2C3_SDA
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All pins are configured using `define`s in the corresponding source code.
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code
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@ -37,7 +37,6 @@
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#include "sensor_sr04.h" // range measurement utilities
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#include "sensor_ds18b20.h" // 1-Wire temperature sensor utilities
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#include "oled_text.h" // OLED display utilities
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#include "sensor_mlx90614.h" // MLX90614 infra-red thermometer utilities
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/** watchdog period in ms */
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#define WATCHDOG_PERIOD 10000
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@ -64,7 +63,6 @@ static uint8_t starter_height = 0; /**< how height the yeast/sour dough starter
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static uint8_t max_height = 0; /**< the maximum height the yeast reached */
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static float heater_temp = NAN; /**< heater temperature */
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static float yeast_temp = NAN; /**< yeast/sour dough starter temperature */
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static float ir_temp = NAN; /**< yeast/sour dough starter temperature as measured by the IR thermometer */
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/** heater control pin
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* @note connected to power nMOS gate, pulled up to 5V
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@ -351,7 +349,6 @@ static void command_state(void* argument)
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height = ((container_height && current_height) ? (container_height - current_height) : 0);
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printf("current height: %u mm\n", height);
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printf("sourdough temperature: %.02f °C\n", yeast_temp);
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printf("IR temperature: %.02f °C\n", ir_temp);
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printf("heater temperature: %.02f °C\n", heater_temp);
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puts("heater: ");
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puts(gpio_get(GPIO_PORT(HEATER_PIN), GPIO_PIN(HEATER_PIN)) ? "on\n" : "off\n");
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@ -638,14 +635,6 @@ void main(void)
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puts("KO\n");
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}
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puts("setup MLX90614 IR-thermometer: ");
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const bool sensor_mlx90614_ok = sensor_mlx90614_setup(0xff); // setup sensor
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if (sensor_mlx90614_ok) {
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puts("OK\n");
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} else {
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puts("KO\n");
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}
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puts("setup SSD1306 OLED display: ");
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const bool oled_text_ok = oled_text_setup(); // setup display
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if (oled_text_ok) {
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@ -658,7 +647,7 @@ void main(void)
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}
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// show status
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const bool all_ok = heater_ok && sensor_sr04_ok && sensor_ds18b20_present && thermsitor_ok && sensor_mlx90614_ok && oled_text_ok;
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const bool all_ok = heater_ok && sensor_sr04_ok && sensor_ds18b20_present && thermsitor_ok && oled_text_ok;
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if (oled_text_ok) {
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if (all_ok) {
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oled_text_line("press button", 1);
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@ -674,8 +663,6 @@ void main(void)
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oled_text_line("heater thermo.", 2);
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} else if (!thermsitor_ok) {
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oled_text_line("thermistor", 2);
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} else if (!sensor_mlx90614_ok) {
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oled_text_line("IR thermo.", 2);
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} else {
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oled_text_line("unknown", 2);
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}
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@ -779,10 +766,6 @@ void main(void)
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if (thermsitor_ok) {
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yeast_temp = thermistor_temperature(); // get temperature
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}
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// show IR temperature
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if (sensor_mlx90614_ok) {
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ir_temp = sensor_mlx90614_temperature_object(); // get temperature
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}
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// update uptime
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if (yeast_time) {
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const uint32_t uptime = rtc_to_seconds() - yeast_time; // get time from internal RTC
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@ -1,86 +0,0 @@
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/** library to communicate with MLX90614 infra-red thermometer
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* @file
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @copyright SPDX-License-Identifier: GPL-3.0-or-later
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* @date 2020
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* @note peripherals used: GPIO @ref sensor_mlx90614_gpio, I2C @ref i2c_master_i2c
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* @note this library only uses the I²C interface, not the PWM output
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*/
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/* standard libraries */
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#include <stdint.h> // standard integer types
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#include <stdbool.h> // boolean type
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#include <stdlib.h> // general utilities
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#include <math.h> // NaN definition
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/* STM32 (including CM3) libraries */
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#include <libopencm3/stm32/rcc.h> // real-time control clock library
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#include <libopencm3/stm32/gpio.h> // general purpose input output library
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#include <libopencm3/stm32/i2c.h> // I²C library
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/* own libraries */
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#include "global.h" // global utilities
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#include "sensor_mlx90614.h" // own definitions
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#include "smbus_master.h" // SMBus utilities
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/** @defgroup sensor_mlx90614_gpio GPIO pin used to control the MLX90614
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* @{
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*/
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#define SENSOR_MLX90614_SCL PA8 /**< GPIO pin for SMBus SCL, use to send request condition to switch mode from PWM to SMBus (must be the same as used for SMBus communication) */
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/** @} */
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/** MLX90614 I²C slave address */
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static uint8_t sensor_mlx90614_slave_addr = 0x5a;
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bool sensor_mlx90614_setup(uint8_t slave_addr)
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{
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if (!smbus_master_check_signals()) { // check if there are pull-ups to operate I²C
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return false;
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}
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// send request condition to switch to I²C mode
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rcc_periph_clock_enable(GPIO_RCC(SENSOR_MLX90614_SCL)); // enable clock for GPIO port domain
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gpio_mode_setup(GPIO_PORT(SENSOR_MLX90614_SCL), GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN(SENSOR_MLX90614_SCL)); // set pin as output
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gpio_set_output_options(GPIO_PORT(SENSOR_MLX90614_SCL), GPIO_OTYPE_OD, GPIO_OSPEED_2MHZ, GPIO_PIN(SENSOR_MLX90614_SCL)); // set pin output as open-drain (should be pulled up by external resistors required for I²C communication
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gpio_clear(GPIO_PORT(SENSOR_MLX90614_SCL), GPIO_PIN(SENSOR_MLX90614_SCL)); // set low to send request condition
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sleep_us(1024 + 500); // SMBus Request is min. 1.024 ms
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gpio_set(GPIO_PORT(SENSOR_MLX90614_SCL), GPIO_PIN(SENSOR_MLX90614_SCL)); // set back high to end request condition
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if (slave_addr < 0x80) { // only the least 7-bit are valid (use default address else)
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sensor_mlx90614_slave_addr = slave_addr; // save I²C slave address of MLX90614
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}
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smbus_master_setup(100, true); // setup SMBus with PEC
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uint8_t response[2]; // response is always 2 bytes
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// test if the device is present
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smbus_master_command_read(sensor_mlx90614_slave_addr, 0x20 | 0x0e, response, LENGTH(response)); // I don't know whey, but the PEC for the first transfer is erroneous, maybe because it has some old bits in the calculation buffer
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const enum smbus_master_rc rc = smbus_master_command_read(sensor_mlx90614_slave_addr, 0x20 | 0x0e, response, LENGTH(response)); // read its own slave address
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if (SMBUS_MASTER_RC_NONE != rc) { // read failed
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return false; // could not read from SMBus device
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}
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if (sensor_mlx90614_slave_addr != response[0]) { // the used slave address does not match the one in the ROM
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return false; // this is probably not a MLX90614
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}
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return true;
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}
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float sensor_mlx90614_temperature_ambient(void)
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{
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uint8_t response[2]; // response is always 2 bytes
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const enum smbus_master_rc rc = smbus_master_command_read(sensor_mlx90614_slave_addr, 0x00 | 0x06, response, LENGTH(response)); // read Ta from RAM
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if (SMBUS_MASTER_RC_NONE != rc) { // read failed
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return NAN;
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}
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const uint16_t temp = response[0] + (response[1] << 8); // low byte is transferred first
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return temp * 0.02 - 273.15; // calculated temperature according to specification 7.7.1
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}
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float sensor_mlx90614_temperature_object(void)
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{
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uint8_t response[2]; // response is always 2 bytes
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const enum smbus_master_rc rc = smbus_master_command_read(sensor_mlx90614_slave_addr, 0x00 | 0x07, response, LENGTH(response)); // read Tobj1 from RAM
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if (SMBUS_MASTER_RC_NONE != rc) { // read failed
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return NAN;
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}
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const uint16_t temp = response[0] + (response[1] << 8); // low byte is transferred first
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return temp * 0.02 - 273.15; // calculated temperature according to specification 7.7.1
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}
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@ -1,27 +0,0 @@
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/** library to communicate with MLX90614 infra-red thermometer
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* @file
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* @author King Kévin <kingkevin@cuvoodoo.info>
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* @copyright SPDX-License-Identifier: GPL-3.0-or-later
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* @date 2020
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* @note peripherals used: GPIO @ref sensor_mlx90614_gpio, I2C @ref i2c_master_i2c
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* @note this library only uses the I²C interface, not the PWM output
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*/
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#pragma once
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/** setup I²C bus to communicated with MLX90614 Infra-Red thermometer
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* @param[in] slave_addr I²C slave address of MLX90614 device (least significant 7-bit, 0xff for default)
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* @return if the display setup is successful, else the display is probably not on the I²C bus
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* @warning only one display on the I²C bus is currently supported
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* @note I²C frequency is 100 kHz
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*/
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bool sensor_mlx90614_setup(uint8_t slave_addr);
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/** get ambient temperature of sensor
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* @return ambient temperature in °C
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* @note uses internal thermistor
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*/
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float sensor_mlx90614_temperature_ambient(void);
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/** get measured object temperature
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* @return object temperature in °C
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* @note uses IR sensor
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*/
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float sensor_mlx90614_temperature_object(void);
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