Split the selected curve in three section and approximate the curve with some functions.Guess the average discharging current and calculate C. I am converting 12V -> 5V to power the board, but I am trying to figure out a way to a) measure the voltage from the external battery b) be able.It also shows your battery voltage on the LCD connected to the Arduino. This Arduino battery voltage indicator indicates the status of the battery by glowing LEDs on a 10 Segment LED Bar Graph according to the battery voltage. A 6V battery has, depending of the Depth-of-Discharge (DOD) an open circuit voltage of about 5.75V when fully discharged and 6.37V when fully charged. Arduino Projects (40+) ARM Projects (100+). I have to get the characteristic of the battery. This circuit will help you to monitor the voltage of your battery. The maximum voltage which can be applied to the L7805 (TO-220 package), 5V linear voltage regulator is 35Volt. Different kinds of infrared receivers mainly exist depending on the voltage, wavelength, package, etc.I think for more accurate calculation the following steps are required: Regarding point b) : This is a major obstacle and the note is absolutely correct. So row#2 to be modified to: const unsigned long BatVref = 2465 //mV This is giving on MEGA AREF's pin with DMM 2.465 V, instead of 2.560 V. Value = analogRead(0) //The effect of analogReference() call doesn't take place till the next call to analogRead() In this video I show you how I built a car voltage monitor using an ESP8266 wifi nodemcu module.Previous Video Car Temp Sensor. I modified for reference measurement this code as well: int value Serial.print("Battery level : ") Serial.println(percentage) // with regression func. Serial.print("Batery voltage: : ") Serial.println(batVoltage) īyte percentage = 100 * (batVoltage - BatVoltMin) / (BatVoltMax - BatVoltMin) //to be replaced ![]() ![]() Unsigned int batVoltage = adcValue * BatRatio / BatResolution Unsigned int adcValue = analogRead(BatVoltPin) // read the divided battery voltage on analog pin # 0ĪnalogReference(DEFAULT) // set back the reference voltage level to normal 5Vįor (int i=0 i<8 i++) analogRead(BatVoltPin) // so later in the main/full program no trouble after initiating 'analogReference(INTERNAL2V56) ' and change here.Ĭonst unsigned long BatResolution = 1024 Ĭonst unsigned long BatRatio = ((BatRs + BatRs) * BatVref) / BatRs ĪnalogReference(INTERNAL2V56) // set the reference voltage level from 5V to 2.56Vįor (int i=0 i<8 i++) analogRead(BatVoltPin) // just burn some ADC readings after reference change void loop() // as long as they have the same unitĬonst unsigned long BatVref = 2560 //mV this must be measured on the AREF pin accurately with DMM Goal: measure the battery charged state in % as accurate as possible.įor this purpose I'm planning a voltage divider and use the internal reference voltage for accurate measuring. 12.8 V charging voltage and 10.7 V cut-off, connected to MEGA Vin pin. So I have a 4 cell LiFePO4 battery with max. ![]() I was searching for hours for proper solution and finally decided to make my version and post here.īefore blowing up my board, I would highly appreciate, if somebody can spend some time and check the goodness of the below code and schematic:
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