Fix float output formatting in sensor readings

- Replace printf with printk using integer formatting for floats
- Add stdio.h include for proper printf support
- Fix SHT4X sensor value display issues
- Temperature and humidity values now display correctly

src/main.c

@@ -5,6 +5,7 @@
 #include <zephyr/sys/printk.h>
 #include <zephyr/drivers/sensor/sht4x.h>
 #include <zephyr/drivers/gpio.h>
+#include <stdio.h>
 
 #include <lora/lorawan.h>
 #include <sensors/mlx90614.h>
@@ -39,11 +40,11 @@ int main(void)
 		request_sensor_data_sht4x();
 		humidity = get_value_from_current_sample_sht4x(SENSOR_CHAN_HUMIDITY);
 		temp = get_value_from_current_sample_sht4x(SENSOR_CHAN_AMBIENT_TEMP);
-		printk("hum: %.2f%%\n", humidity);
+		printk("hum: %d.%02d%%\n", (int)humidity, (int)(humidity * 100) % 100);
-		printk("temp: %.2f °C\n", temp);
+		printk("temp: %d.%02d °C\n", (int)temp, (int)(temp * 100) % 100);
 		request_sensor_data_mlx90614(MLX90614_IR_TEMP_ADDR);
 		floor_temp = get_temp_from_raw_data_mlx90614();
-		printk("floor_temp: %.2f °C\n", floor_temp);
+		printk("floor_temp: %d.%02d °C\n", (int)floor_temp, (int)(floor_temp * 100) % 100);
 
 		/* Set relais based on temperature if not manually overridden */
 		if (!relais_manual_override) {

src/sensors/sht4x.c

@@ -48,9 +48,11 @@ float get_value_from_current_sample_sht4x(enum sensor_channel sensor)
 	float result;
 	if (sensor_channel_get(sht, sensor, &value) == 0) {
 		result = sensor_value_to_double(&value);
-		printf("Value '%s' successfully read [%f]", sensor, result);
+		const char* sensor_name = (sensor == SENSOR_CHAN_AMBIENT_TEMP) ? "temperature" : "humidity";
+		LOG_DBG("SHT4X %s value: %.2f", sensor_name, result);
 	} else {
-		LOG_ERR("Can't read sensor value '%s' from sample!", sensor);
+		const char* sensor_name = (sensor == SENSOR_CHAN_AMBIENT_TEMP) ? "temperature" : "humidity";
+		LOG_ERR("Can't read SHT4X %s from sample!", sensor_name);
 		return 0.0;
 	}
 	return result;