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Finally, it's working as expected, ESP8266 + BME 680  with 5 min deepsleep.   ... View more

Hello FAC_CA, Thank you for your reply, it make sense not to fully setup the sensor after each reboot. I did some changes to the code, I removed RTC memory and instead I'm using EEPROM method. I did below, but still no luck:   void setup() { Serial.begin(9600); ESP.getResetReason(); Wire.pins(0, 2); Wire.begin(0, 2); iaqSensor.begin(BME680_I2C_ADDR_SECONDARY, Wire); checkIaqSensorStatus(); if ( resetInfo.reason == REASON_DEEP_SLEEP_AWAKE ) { Serial.println("DeepSleep"); } else { Serial.println("Reset"); EEPROM.begin(BSEC_MAX_STATE_BLOB_SIZE + 1); // 1st address for the length iaqSensor.setConfig(bsec_config_iaq); loadState(); checkIaqSensorStatus(); } bsec_virtual_sensor_t sensorList[7] = { BSEC_OUTPUT_RAW_TEMPERATURE, BSEC_OUTPUT_RAW_PRESSURE, BSEC_OUTPUT_RAW_HUMIDITY, BSEC_OUTPUT_RAW_GAS, BSEC_OUTPUT_IAQ, BSEC_OUTPUT_SENSOR_HEAT_COMPENSATED_TEMPERATURE, BSEC_OUTPUT_SENSOR_HEAT_COMPENSATED_HUMIDITY, }; iaqSensor.updateSubscription(sensorList, 7, BSEC_SAMPLE_RATE_ULP); checkIaqSensorStatus(); esp_timer_get_time = millis(); wifi_setup(); client.setServer(mqttServer, 1883); esp_timer_get_time1 = millis(); } ... View more

More output: (3S_LP) 19:53:12.141 -> Deep-Sleep Wake 19:53:12.181 -> 0 19:53:12.381 -> 000000244: setState: 19:53:12.381 -> 000000245: Successfully set state from 1051588384933517 19:53:12.461 -> 000000247: Sensor init done 19:53:13.141 -> 000001019: IAQ 25 accuracy 0 19:53:13.661 -> 000001523: getState: 19:53:13.661 -> 000001523: Deep sleep for 2240 ms. BSEC next call at 3764 ms. . . . 20:04:29.018 -> Deep-Sleep Wake 20:04:29.018 -> 0 20:04:29.218 -> 000000245: setState: 20:04:29.258 -> 000000245: Successfully set state from 1059203732008448 20:04:29.298 -> 000000247: Sensor init done 20:04:30.218 -> 000001233: IAQ 25 accuracy 0 20:04:30.738 -> 000001737: getState: 20:04:30.738 -> 000001737: Deep sleep for 2240 ms. BSEC next call at 3978 ms. ... View more

Hello, Sorry AIQ was a typo. I meant  IAQ. Now to give you more idea: IAQ value shows 25 all the time when I use deepsleep on ESP8266(check the picture), accuracy is also 0 all the time. As far as I understand from other threads , each time after ESP8266 wakes up , it reset timestamp on BME680? and I understand it can be fixed by using RTC memory? but don't know how to do it? Thank you, ... View more