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modified: main/include/sht31.h

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modified:   main/src/main.c
modified:   main/src/sht31.c
Fix floating point issue with Sensor readouts
This commit is contained in:
Sven Luethi committed 2024-08-11 11:20:15 +02:00
1 parent 34e0561f46
commit 1341a1000a
3 files changed
+15 -48
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firmware/main/src/main.c
+15 -4
View File
@@ -36,18 +36,29 @@ static void wifi_init(void) {
}
*/
static void split_float(float num, int *int_part, float *dec_part) {
// Extract the integer part
*int_part = (float)((int)num);
// Calculate the fractional part by subtracting the integer part from the original number
*dec_part = num - *int_part;
}
void sensor_tester(void)
{
ESP_ERROR_CHECK(sht31_init());
//float temperature, humidity;
int temperature, humidity;
float temperature, humidity, temp_dec_part, hum_dec_part;
int temp_int_part, hum_int_part;
while (1) {
//if (sht31_read_temp_hum(&temperature, &humidity) == ESP_OK) {
if (sht31_read_temp_hum_int(&temperature, &humidity) == ESP_OK) {
if (sht31_read_temp_hum(&temperature, &humidity) == ESP_OK) {
split_float(temperature, &temp_int_part, &temp_dec_part);
split_float(humidity, &hum_int_part, &hum_dec_part);
//ESP_LOGI(TAG, "Temperature: %.2f°C, Humidity: %.2f%%", temperature, humidity);
ESP_LOGI(TAG, "Temperature: %i°C, Humidity: %i%%", temperature, humidity);
ESP_LOGI(TAG, "Temperature: %i.%i°C, Humidity: %i.%i%%", temp_int_part, (int)(temp_dec_part*1000), hum_int_part, (int)(hum_dec_part*1000));
} else {
ESP_LOGE(TAG, "Failed to read from SHT31 sensor");
}
firmware/main/src/sht31.c
-43
View File
@@ -100,46 +100,3 @@ esp_err_t sht31_read_temp_hum(float *temperature, float *humidity)
return ESP_OK;
}
esp_err_t sht31_read_temp_hum_int(int *temperature, int *humidity)
{
uint8_t data[6];
i2c_cmd_handle_t cmd = i2c_cmd_link_create();
// Send the measurement command
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (SENSOR_ADDR << 1) | I2C_MASTER_WRITE, true);
i2c_master_write_byte(cmd, SHT31_MEASURE_CMD_HIGHREP >> 8, true);
i2c_master_write_byte(cmd, SHT31_MEASURE_CMD_HIGHREP & 0xFF, true);
i2c_master_stop(cmd);
esp_err_t ret = i2c_master_cmd_begin(I2C_NUM_0, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to send command to SHT31");
return ret;
}
vTaskDelay(500 / portTICK_RATE_MS);
// Request 6 bytes of data from the sensor
cmd = i2c_cmd_link_create();
i2c_master_start(cmd);
i2c_master_write_byte(cmd, (SENSOR_ADDR << 1) | I2C_MASTER_READ, true);
i2c_master_read(cmd, data, sizeof(data) - 1, I2C_MASTER_ACK);
i2c_master_read_byte(cmd, data + sizeof(data) - 1, I2C_MASTER_NACK);
i2c_master_stop(cmd);
ret = i2c_master_cmd_begin(I2C_NUM_0, cmd, 1000 / portTICK_RATE_MS);
i2c_cmd_link_delete(cmd);
if (ret != ESP_OK) {
ESP_LOGE(TAG, "Failed to read data from SHT31");
return ret;
}
// Process the data
uint16_t t = (data[0] << 8) | data[1];
uint16_t h = (data[3] << 8) | data[4];
*temperature = -45 + 175 * ((float)t / 65535.0);
*humidity = 100 * ((float)h / 65535.0);
return ESP_OK;
}