![]() ![]() For example if you put 180K in series, the voltage. Connect the other end to Arduino Vin and also to Battery + (positive). LED Vs voltage level can be changed by modifying the Arduino code. Connect one end to Arduino GND and also to Battery - (negative). In effect this increases the value of the on-board 220K. The battery voltage measuring range is 9.75V to 14.5V. If you want to increase this range, you can just put another resistor in series with the Wemos analog pin. REFS1 REFS0 -> 0 1, AVcc internal ref. The Wemos boards have a voltage divider consisting of 220K & 100K, so that it can accept voltages up to 1.0 (220+100)/100 3.2V. To overcome this issue, we can compare the voltage difference between the Serial Monitor reading and the Multimeter reading. This first bit goes in setup() // set up for batt voltage measurement In our case, we want to measure a 12-volt battery, and NodeMCU ADC (analog to digital converter) can only accept 3.3 volts. A voltage greater than 5 volts may blow the pin or fry the NodeMCU. Since it is working on 3.3 volts, its pins can source and sunk 3.3 volts only. The thread did not finish with good recommendations, so I post this. NodeMCU is a tiny device it works on 3.3 volts. This is the code I use in my standalone 328. system May 27, 2011, 7:53pm 1 Hello I found an article in the read-only forum regarding 12 Battery current monitoring. Pretend that the reference voltage is Vcc (which will vary as the battery discharges) and use that to measure the 1.1v internal reference voltage (which won't change). I'm planning to monitor voltage of a 12V battery with an Arduino's ADC pin connected via a voltage divider. In other words, when measuring 55V, the Arduino analog pin will be at its maximum voltage of 5V. I thought I could do this with a single PNP j. The junction on the voltage divider network connected to the the Arduino analog pin is equivalent to the input voltage divided by 11, so 55V 11 5V. Both 12 and 24 volt rails need to have a battery monitoring circuit, which I need to have switchable via a transistor so that the voltage divider isnt always on and wasting battery charge. The trick is to turn the voltage measuring upside down. Heres what Im trying to do: Create a power distribution board with a 12 volt and 24 volt input/output. I don't know about an Arduino board but you can easily power an Atmega 328 chip from a 3.7v LiPo and have it report the correct battery voltage.
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