alexey.zholtikov/zh_bh1750
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This commit is contained in:
Alexey Zholtikov
2024-06-16 15:16:38 +03:00
parent f77318150c
commit 1253d6a1ae
3 changed files with 39 additions and 5 deletions
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7
README.md
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@ -5,6 +5,11 @@
1. ESP8266 RTOS_SDK v3.4 1. ESP8266 RTOS_SDK v3.4
2. ESP32 ESP-IDF v5.2 2. ESP32 ESP-IDF v5.2
## Features
1. Recorded illuminance values from 0.11 to 121241 lux (depends on operation mode and sensitivity).
2. Support automatically sensitivity adjustment.
## Using ## Using
In an existing project, run the following command to install the component: In an existing project, run the following command to install the component:
@ -66,7 +71,7 @@ void app_main(void)
for (;;) for (;;)
{ {
zh_bh1750_read(&lux); zh_bh1750_read(&lux);
printf("Lux %d\n", (uint32_t)lux); printf("Lux %0.2f\n", lux);
vTaskDelay(1000 / portTICK_PERIOD_MS); vTaskDelay(1000 / portTICK_PERIOD_MS);
} }
} }

6
include/zh_bh1750.h
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@ -19,7 +19,8 @@
.i2c_address = I2C_ADDRESS_LOW, \ .i2c_address = I2C_ADDRESS_LOW, \
.operation_mode = HIGH_RESOLUTION, \ .operation_mode = HIGH_RESOLUTION, \
.work_mode = ONE_TIME, \ .work_mode = ONE_TIME, \
.i2c_port = 0 \ .i2c_port = 0, \
.auto_adjust = false \
} }
#ifdef __cplusplus #ifdef __cplusplus
@ -52,7 +53,8 @@ extern "C"
CONTINUOUSLY, // Continuously measurement. CONTINUOUSLY, // Continuously measurement.
ONE_TIME // One time measurement. Sensor is power down after measurement. ONE_TIME // One time measurement. Sensor is power down after measurement.
} work_mode; } work_mode;
bool i2c_port; // I2C port. bool i2c_port; // I2C port.
bool auto_adjust; // Flag of automatic sensitivity adjustment.
#ifndef CONFIG_IDF_TARGET_ESP8266 #ifndef CONFIG_IDF_TARGET_ESP8266
i2c_master_bus_handle_t i2c_handle; // Unique I2C bus handle. i2c_master_bus_handle_t i2c_handle; // Unique I2C bus handle.
#endif #endif

31
zh_bh1750.c
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@ -84,6 +84,7 @@ esp_err_t zh_bh1750_read(float *data)
ESP_LOGE(TAG, "BH1750 read fail. BH1750 not initialized."); ESP_LOGE(TAG, "BH1750 read fail. BH1750 not initialized.");
return ESP_ERR_NOT_FOUND; return ESP_ERR_NOT_FOUND;
} }
REPEATE:
esp_err_t esp_err = ESP_OK; esp_err_t esp_err = ESP_OK;
uint8_t sensor_data[2] = {0}; uint8_t sensor_data[2] = {0};
if (_init_config.work_mode == CONTINUOUSLY) if (_init_config.work_mode == CONTINUOUSLY)
@ -132,13 +133,39 @@ READ:
ESP_LOGE(TAG, "BH1750 read fail. I2C driver error."); ESP_LOGE(TAG, "BH1750 read fail. I2C driver error.");
return esp_err; return esp_err;
} }
uint32_t raw_data = sensor_data[0] << 8 | sensor_data[1];
if (raw_data == 65536 || raw_data == 0)
{
ESP_LOGW(TAG, "BH1750 read error. Sensitivity adjustment required. Current sensivity level %d", _sensivity);
}
if (_init_config.auto_adjust == true)
{
printf("RAW data %ld\n", raw_data);
printf("Sensivity %d\n", _sensivity);
if (raw_data == 65536 && _sensivity > 31)
{
if (zh_bh1750_adjust(_sensivity - 1) == ESP_OK)
{
--_sensivity;
goto REPEATE;
}
}
if (raw_data == 0 && _sensivity < 254)
{
if (zh_bh1750_adjust(_sensivity + 1) == ESP_OK)
{
++_sensivity;
goto REPEATE;
}
}
}
if (_init_config.operation_mode == HIGH_RESOLUTION_2) if (_init_config.operation_mode == HIGH_RESOLUTION_2)
{ {
*data = (sensor_data[0] << 8 | sensor_data[1]) * (1 / 1.2 * (69.0 / _sensivity) / 2); *data = raw_data * (1 / 1.2 * (69.0 / _sensivity) / 2);
} }
else else
{ {
*data = (sensor_data[0] << 8 | sensor_data[1]) * (1 / 1.2 * (69.0 / _sensivity)); *data = raw_data * (1 / 1.2 * (69.0 / _sensivity));
} }
ESP_LOGI(TAG, "BH1750 read success."); ESP_LOGI(TAG, "BH1750 read success.");
return ESP_OK; return ESP_OK;