![]() If ((value=450)) //if value greater than 450 and value less than 573 then. If (value>573) //if value greater than 573 then. Value=analogRead(0) //Read the analog value at port A0 and put it in "value" PinMode(10,OUTPUT) //tell Arduino that pin 10(DIGITAL INPUT/OUTPUT) is to be used as OUTPUT PinMode(9,OUTPUT) //tell Arduino that pin 9 (DIGITAL IN/OUT) is to be used as OUTPUT PinMode(8,OUTPUT) //tell Arduino that pin 8 (DIGITAL IN/OUT) is to be used as OUTPUT Int Green=10 // I declare an integer variable in which I will connect the green LED Int Yellow=9 //declare an integer variable in which I will connect the yellow LED Int Red=8 //declare an integer variable where I will connect the red LED Int value //declare the value variable that will store the value given by the analog-to-digital converter ![]() For more Projects: // ATTENTION DO NOT USE BATTERIES WITH VOLTAGES HIGHER 5V if you Learn How to install the Arduino step-by-step guide then click on how to install Arduino Button given BlowĪnd that’s all, remember that Arduino does not support voltages higher than 5V so never exceed this voltage in the INPUT at the Pins. So we will calibrate the Arduino to these values:įirst, you will require to Download the updated version of Arduino IDE Software and Install it on your PC or laptop. 2.2V – 0V 2.8V – 2.2 Average voltage, Average charge.In my case I used two AA batteries in series which theoretically correspond to 3V, so we will write: Having built the circuit, we just have to do the math depending on the voltage of the battery or batteries. When the voltage level of the battery is measured, the Arduino will then determine which LED to light up based on the voltage level, which is then displayed to the user. The LEDs are connected to the digital pins of the Arduino board via 220-ohm resistors. The analog pin A0 is connected to the positive terminal of the battery via a 10k ohm resistor, while the negative terminal of the battery is connected to the ground. The circuit develops in such a way that when the voltage level of the battery is at its maximum, the green LED will light up, and as the voltage level decreases, the yellow and red LEDs will light up. ![]() Tmr.alarm(0, 10000, 1, function() readUI() LCDout() tmr.delay(1000) end)Ĭonn:send("Battery Live Monitor System - ESP8266")Ĭonn:send("Node.HEAP : ". St7032i:lcd_print(1,1,string.format("Battery Monitor")) If (fnr Voltage / Current / Energy / Powerįor more details about the I2C LCD Driver, please take a look at the ST7032i LCD Driver Article Nrf=string.format(" %.3f%s ",fnri, uniti) Number format function for proper LCD printing READ ADC Process function and instantaneous Power consumtion calculation Resdiv = 4.31447 - Voltage Divider Ratio - CALIBRATE!!ĭivalI = 0.9425 - Current volt/div ratio - CALIBRATE!! Voltdiv= 0.00412 - Voltage reading calibrationĭival = 0.00096 - ADC volt/div value - CALIBRATE !! Gpio.write(ADC_SRC,0) - Current Measurement - Current Shunt Monitor output selected Gpio.write(ADC_SRC,1) - Voltage Measurement - Voltage Divider Source selected Gpio.mode(ADC_SRC,gpio.OUTPUT, gpio.PULLUP) Instantaneous power is given by multiplying the measured voltage by the calculated current (P=U*I).īy taking readings for a certain amount of time until the battery is completly discharged, and adding up the energy dissipated in each time interval, we can calculate the total energy taken from the battery and dissipated in the resistor and therefore the total energy that was stored in the fully charged battery.įor programming CBDBv2 Evo Board and uploading the drivers and the software we will continue to use the LuaUploader as before.ĪDC_SRC = 5 - GPIO14 - select Voltage Divider / Current Input Using Ohm's Law (I=U/R) we can then calculate the current flowing through the load since we know the voltage across it. By measuring the voltage across this resistor at regular intervals during the discharge process it is simple to calcuate the total energy dissipated and therefore the total energy which had been stored in the battery. In order to measure the stored energy in a battery a power resistor is used as the load, and a fully charged battery is fully discharged through it. Stored energy is measured in Watt-hours - the same unit used to measure our domestic electricity consumption (where 1,000Wh = 1kWh = 1 unit of electricity). When measuring the real battery capacity what we are interested in is the amount of energy stored in a battery since it is this energy we need to power our devices.
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