About Arya

Hello Everyone, I am considering BME280 in one of our projects, using Sparkfun BME280 break out board to evaluate the accuracy and performance of the sensor. I am getting temperature, humidity, and pressure readings 0 (uncompensated value 0, after compensation temperature -40,  humidity 0, and pressure 110000.   struct bme280_dev dev; uint32_t req_delay; uint8_t i2c_try = 0; /* BME280 sensor's API call */ static int8_t bme280_i2c_read(uint8_t reg_addr, uint8_t *reg_data, uint32_t len, void *intf_ptr){ while (i2c_try < 5){ if (HAL_I2C_Mem_Read(&I2c2Handle, *(uint16_t *)intf_ptr, (uint16_t) reg_addr, 1, reg_data, (uint16_t) len, 1000) != HAL_OK){ I2C2_Error (); i2c_try++; } else { i2c_try = 5; } } i2c_try = 0; return 0; } static int8_t bme280_i2c_write(uint8_t reg_addr, const uint8_t *reg_data, uint32_t len, void *intf_ptr){ while (i2c_try < 5){ if (HAL_I2C_Mem_Write(&I2c2Handle, *(uint16_t *) intf_ptr, (uint16_t) reg_addr, 1, reg_data, (uint16_t) len, 1000) != HAL_OK){ I2C2_Error (); i2c_try++; } else { i2c_try = 5; } } i2c_try = 0; return 0; } static void bme280_delay_us(uint32_t period, void *intf_ptr){ HAL_Delay(1000); } int8_t bme280_Senosr_Init (void){ int8_t rslt = BME280_OK; memset(&dev, 0, sizeof(struct bme280_dev)); uint8_t dev_addr = (BME280_I2C_ADDR_SEC << 1); dev.intf_ptr = &dev_addr; dev.intf = BME280_I2C_INTF; dev.read = bme280_i2c_read; dev.write = bme280_i2c_write; dev.delay_us = bme280_delay_us; rslt = bme280_init(&dev); uint8_t settings_sel; /* Recommended mode of operation: Weather monitoring */ dev.settings.osr_h = BME280_OVERSAMPLING_1X; dev.settings.osr_p = BME280_OVERSAMPLING_1X; dev.settings.osr_t = BME280_OVERSAMPLING_1X; dev.settings.filter = BME280_FILTER_COEFF_OFF; settings_sel = BME280_OSR_PRESS_SEL | BME280_OSR_TEMP_SEL | BME280_OSR_HUM_SEL | BME280_FILTER_SEL; rslt = bme280_set_sensor_settings(settings_sel, &dev); /*Calculate the minimum delay required between consecutive measurement based upon the sensor enabled * and the oversampling configuration. */ req_delay = bme280_cal_meas_delay(&dev.settings); return rslt; } int8_t bme280_readings (struct bme280_data *comp_data){ int8_t rslt = BME280_OK; rslt = bme280_set_sensor_mode(BME280_FORCED_MODE, &dev); /* Wait for the measurement to complete and print data @25Hz */ dev.delay_us(req_delay, dev.intf_ptr); rslt = bme280_get_sensor_data(BME280_ALL, comp_data, &dev); return rslt; }    I have added a delay for 1 second between bme280_set_sensor_mode and bme280_get_sensor_data. I call bme280_Senosr_Init after I2C initialization at one time, bme280_readings  in a process that runs every 10 seconds.  I am using the BME280 V.3.50. Why BME280 not giving sensor reading correctly? Any thought? If more information needed to understand the problem, please let me know. Thanks! -Arya   ... View more