ReiMerc/temperature-alarm
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Implement printing temperature on display

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This commit is contained in:
Reimar 2025-03-26 09:58:43 +01:00
parent 60c0fc9475
commit 2f5f753ab6
Signed by: Reimar
GPG Key ID: 93549FA07F0AE268
6 changed files with 113 additions and 22 deletions
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6
iot/Makefile
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@ -1,3 +1,5 @@
all: main.c brokers/mqtt.c brokers/amqp.c temperature.c device_id.c
$(CC) -lmosquitto -lrabbitmq -lpthread -li2c main.c brokers/mqtt.c brokers/amqp.c temperature.c device_id.c
FILES=main.c brokers/mqtt.c brokers/amqp.c devices/temperature.c devices/display.c device_id.c
all: $(FILES)
$(CC) -lmosquitto -lrabbitmq -lpthread -li2c $(FILES)

60
iot/devices/display.c Normal file
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@ -0,0 +1,60 @@
#include <linux/i2c-dev.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <i2c/smbus.h>
#include "display.h"
#define JHD1313_BUS "/dev/i2c-2"
#define JHD1313_ADR 0x3e
void display_set_cursor_pos(display_handle_t display, int x, int y)
{
i2c_smbus_write_byte_data(display, 0x00, (y ? 0xC0 : 0x80) + x);
}
void display_write_str(display_handle_t display, char *str)
{
while (*str) {
display_write_char(display, *str);
str++;
}
}
void display_write_char(display_handle_t display, char ch)
{
i2c_smbus_write_byte_data(display, 0x40, ch);
}
display_handle_t init_display()
{
int file = open(JHD1313_BUS, O_RDWR);
if (file < 0) {
perror("Error opening display device");
exit(EXIT_FAILURE);
}
if (ioctl(file, I2C_SLAVE, JHD1313_ADR) == -1) {
fprintf(stderr, "ERROR: setting address %d on i2c bus %s with ioctl() - %s", JHD1313_ADR, JHD1313_BUS, strerror(errno));
exit(EXIT_FAILURE);
}
// 2 line mode, 5x8
i2c_smbus_write_byte_data(file, 0x00, 0x28);
// Display on, cursor on, blink off
i2c_smbus_write_byte_data(file, 0x00, 0x0C);
// Display clear
i2c_smbus_write_byte_data(file, 0x00, 0x01);
// Entry mode set
i2c_smbus_write_byte_data(file, 0x00, 0x06);
i2c_smbus_write_byte_data(file, 0x00, 0x02);
return file;
}

10
iot/devices/display.h Normal file
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@ -0,0 +1,10 @@
typedef int display_handle_t;
display_handle_t init_display();
void display_set_cursor_pos(display_handle_t display, int x, int y);
void display_write_str(display_handle_t display, char *str);
void display_write_char(display_handle_t display, char ch);

38
iot/temperature.c → iot/devices/temperature.c
View File

@ -11,8 +11,10 @@
#include "temperature.h"
#define MPC9808_BUS "/dev/i2c-2"
#define MPC9808_ADR 0x18
#define MCP9808_BUS "/dev/i2c-2"
#define MCP9808_ADR 0x18
#define MCP9808_MANID 0x0054
#define MCP9808_DEVID 0x04
#define CONFIG_REG 0x01
#define TUPPER_REG 0x02
@ -53,16 +55,16 @@ double get_temperature(temperature_handle_t file)
temperature_handle_t init_temperature(void)
{
int file = open(MPC9808_BUS, O_RDWR);
int file = open(MCP9808_BUS, O_RDWR);
if (file < 0) {
fprintf(stderr, "Error opening temperature sensor device (%s): %s\n", MPC9808_BUS, strerror(errno));
exit(1);
perror("Error opening temperature sensor device");
exit(EXIT_FAILURE);
}
if (ioctl(file, I2C_SLAVE, MPC9808_ADR) == -1) {
fprintf(stderr, "ERROR: setting address %d on i2c bus %s with ioctl() - %s", MPC9808_ADR, MPC9808_BUS, strerror(errno));
exit(1);
if (ioctl(file, I2C_SLAVE, MCP9808_ADR) == -1) {
fprintf(stderr, "ERROR: setting address %d on i2c bus %s with ioctl() - %s", MCP9808_ADR, MCP9808_BUS, strerror(errno));
exit(EXIT_FAILURE);
}
int32_t reg32;
@ -73,23 +75,23 @@ temperature_handle_t init_temperature(void)
reg32 = i2c_smbus_read_word_data(file, MANID_REG);
if (reg32 < 0) {
fprintf(stderr, "ERROR: Read failed on i2c bus register %d - %s\n", MANID_REG,strerror(errno));
exit(1);
fprintf(stderr, "Read failed on i2c bus register %d: %s\n", MANID_REG, strerror(errno));
exit(EXIT_FAILURE);
}
if (bswap_16(reg16poi[0]) != 0x0054) {
fprintf(stderr, "Manufactorer ID wrong is 0x%x should be 0x54\n",__bswap_16(reg16poi[0]));
exit(1);
if (bswap_16(reg16poi[0]) != MCP9808_MANID) {
fprintf(stderr, "Invalid manufacturer ID: Expected 0x%x, got 0x%x\n", MCP9808_MANID, __bswap_16(reg16poi[0]));
exit(EXIT_FAILURE);
}
// Read device ID and revision
reg32 = i2c_smbus_read_word_data(file, DEVID_REG);
if (reg32 < 0) {
fprintf(stderr, "ERROR: Read failed on i2c bus register %d - %s\n", DEVID_REG,strerror(errno) );
exit(1);
fprintf(stderr, "Read failed on i2c bus register %d - %s\n", DEVID_REG, strerror(errno));
exit(EXIT_FAILURE);
}
if (reg8poi[0] != 0x04) {
fprintf(stderr, "Manufactorer ID OK but device ID wrong is 0x%x should be 0x4\n",reg8poi[0]);
exit(1);
if (reg8poi[0] != MCP9808_DEVID) {
fprintf(stderr, "Invalid device ID - expected 0x%x, got 0x%x\n", MCP9808_DEVID, reg8poi[0]);
exit(EXIT_FAILURE);
}
return file;

0
iot/temperature.h → iot/devices/temperature.h
View File

21
iot/main.c
View File

@ -7,7 +7,8 @@
#include <time.h>
#include "brokers/amqp.h"
#include "temperature.h"
#include "devices/temperature.h"
#include "devices/display.h"
#include "device_id.h"
void *watch_temperature(void *arg)
@ -16,14 +17,21 @@ void *watch_temperature(void *arg)
printf("Device ID: %s\n", device_id);
temperature_handle_t temp_handle = init_temperature();
display_handle_t display = init_display();
display_write_str(display, " ");
display_set_cursor_pos(display, 0, 1);
display_write_str(display, "Device.....");
display_write_str(display, device_id);
temperature_handle_t temp_handle = init_temperature();
get_temperature(temp_handle);
while (true) {
// Retrieve data
double temperature = get_temperature(temp_handle);
size_t timestamp = time(NULL);
// Send JSON
char *format = "{"
"\"temperature\": %lf,"
"\"device_id\": \"%s\","
@ -37,6 +45,15 @@ void *watch_temperature(void *arg)
free(str);
// Print on display
str = malloc(17);
sprintf(str, "===[ %.1lf\xDF" "C ]===", temperature);
display_set_cursor_pos(display, 0, 0);
display_write_str(display, str);
free(str);
printf("Temperature: %lf\n", temperature);
sleep(60);