int battery1 = analogRead(battery) //Read voltage level at Analog Pin A0 for NodeMCU Board 3.3V = 1023 R1=1Kohm, R2=220Kohmīattery1 = map(battery1, 730, 875, 0, 100) //convert to % for APP 7V=730, 8. Ev-Peak Vista Power 8S 2 in 1 Voltage Meter & Lipo Alarm. Once I had those values I mapped them to relate to percentage. Onboard Electronics - Voltage Monitors, MAMA Miliamp Monitor for A123/LithiumWerks with Remote LED. With each of the voltages applied to A0 (with voltage divider added) I monitored the values being sent to the serial monitor. Its challenging to convert a measured voltage into a battery percentage. The voltage drops off quickly in the beginning, stays very stable for a long time, and then suddenly drops low at the end of its life: LiPo battery discharge curve. I got the values for the mapping by using an adjustable power supply set at the voltages I wanted to use, i.e 7V would be 0% battery life and 8.4V would be 100%. And secondly, the voltage of Li-ion or LiPo batteries doesnt drop linearly. Here is a snipet of code I use to monitor a 2s LiPo battery. This item: yueton Rc 1-8s Lipo Battery Tester Monitor Low Voltage Buzzer Alarm Voltage Checker with LED Indicator for Lipo LiFe LiMn Li-ion Battery 5.49 5. You don’t want the voltage in the LiPo to go to low or else you will damage them and/or shorten their lifespan. I use 180K between A0 and Vcc for use with li-ion and Wemos. You would need to determine what voltage would equal a dead battery. The analog input on a Di Mini is 3.2V max so you can just use a voltage divider to bring that down and read it directly off the battery. Materials Arduino Nano TP4056 Breakout Board Nokia 3310/5100 LCD 3. The voltage of the battery is displayed on a Nokia 3310/5110 LCD with the Arduino Nano as the microcontroller. battery voltage using pin number with battery voltage monitoring function in nRF52840. Do remember though, 0% battery would not necessarily be 0V at the LiPO. This Arduino LiPo battery monitor and charger features the TP4056 breakout board. Dear All, I would like to order Li-Po batteries for my nRF52840. Maybe you could use a voltage divider on the analog pin, and do some mapping in the code to output an estimated battery percentage.
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