Serial.println(adc_value) // lets assumeĪdc_voltage = (adc_value * ref_voltage) / 4096. Serial.println("The device started, now you can pair it with bluetooth!") SerialBT.begin("Boat") //Bluetooth device name String ssid="BTBHub6-36JX" // your network SSID (name) Tab: Terminal assignment temperature sensor DS18B20 Fig: Test circuit with shunt, load resistor and temperature sensor equivalent to the circuit diagram on the back of the battery monitor Fig: circuit Further information. #error Bluetooth is not enabled! Please run make menuconfig to and enable itĬonst char * myWriteAPIKey = "9U3QMIMX97S6QCUE" #if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED) A delay of 1000ms is added to the program. The voltage is then displayed on the Arduino serial monitor by the command Serial.print (). Gravity-27-Pcs-Sensor-Kit-for-Arduino.jpg Gravity: 27 Pcs Sensor Kit for. we have to sacrifice two ADC pins for I2C. INA219 is I2C based sensor so Arduino pin A4 and A5 is used as I2C SCL and I2C SDA. In order to make this project simple and cost efficient I am using Arduino UNO/Nano. The analog read values are then multiplied by a fraction 5/1023 to convert it to voltage range 0 to 5V. Arduino is well known for its simplicity and low cost. Hello everyone please can you take a look at this coding which is reading two 12 volt car batteries as the end readings showing on the serial monitor are not as accurate as the voltage reading i am getting from my voltmeter, thanks That is by taking 0- 1023 sample values for 0-5 Volts range. VOUT R2 R1 + R2VIN V O U T R 2 R 1 + R 2 V I N. Utilizes the 1.1V internal reference of the ATmega328 to accurately monitor battery voltage and current. Voltage Divider Calculator <<< Use 10K for R2, 3.3V for the output V's. A simple resistor divider will bring the 12 V down to the 5 V an Arduino can digest. A simple library for monitoring battery voltage in Arduino projects. log_i( "fReadBattery %d", uxTaskGetStackHighWaterMark( NULL ) ) VTaskDelayUntil( &xLastWakeTime, xFrequency ) If BATTERYMODESOLID is 1, then it will show the charge level as a solid filled rectangle, as the one you can see in the picture at the beginning of the guide. TimePastKalman = esp_timer_get_time() // time of update complete XSemaphoreGive( sema_CalculatedVoltage ) XSemaphoreTake( sema_CalculatedVoltage, portMAX_DELAY ) KF_ADC_b.setProcessNoise( (esp_timer_get_time() - TimePastKalman) / 1000000.0f ) //get time, in microsecods, since last readingsĪdcValue = KF_ADC_b.updateEstimate( adcValue ) // apply simple Kalman filter ![]() TickType_t xLastWakeTime = xTaskGetTickCount() Ĭonst TickType_t xFrequency = 1000 //delay for mSĪdc1_get_raw(ADC1_CHANNEL_0) //read and discardĪdcValue = float( adc1_get_raw(ADC1_CHANNEL_0) ) //take a raw ADC reading Uint64_t TimePastKalman = esp_timer_get_time() // used by the Kalman filter UpdateProcessNoise, time since last kalman calculation ![]() I use the following code to read 12V battery V's with a ESP32.
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