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ARDUINO LIPO VOLTAGE MONITOR DRIVER
ARDUINO LIPO VOLTAGE MONITOR CODE

If it is, then you shouldn’t have any significant offset. The Ardunio ground should be tied to the analogue ground of the circuit under test. TV.println(9,85,"TVOut Port By TCPMeta") Just follow the typical pinout for the TVout Library found everwhere on the net.įloat R2 = 10000.0 // resistance of R2 (10K) – see text!

I used 1K and 470ohm resistors like what the library examples on. All you need is are two resistors for the video and sync.

ARDUINO LIPO VOLTAGE MONITOR CODE

Here is the modified code for the Voltmeter to give your project a nice analog retro feel. Would just multiplying the value variable by about 6.67 work instead, as this would essentially equal the input variable? (6.67 because the input to the A0 port = 1.8v, which 1.8*6.67 = the initial input voltage of 12) The reason I ask this is because I would like vin to equal the output voltage after the calculations as I plan to break the given number into 3 separate digits (using modulo). Now, being that I don’t plan to use this code hooked up to an LCD display, I can’t really test this code for myself (though I assume it would work as advertised), though if it’s outputting variable vin, I would assume it would display “Input V = 0.0959.” How does it convert that number to the input voltage as shown in the pictures instead of the above value?

So, the equation used to “decode” the input voltage to the A0 port on the arduino results in 0.0959 (about) from running it through a calculator with value = 1.8v (from 12v source) and R1 + R2 at the default values. Sorry if the answer to this question is completely obvious, I am new to arduino and coding in general. Vin=0.0 //statement to quash undesired reading ! No other protection (for voltage spikes, reverse voltages or higher voltages) is incorporated in this circuit!Īn Arduino DVM based on voltage divider conceptįloat R1 = 100000.0 // resistance of R1 (100K) -see text!įloat R2 = 10000.0 // resistance of R2 (10K) - see text! Keep it in mind that any input voltage higher than about 55V could fry the Arduino.

The resistor values (R1&R2) in the circuit diagram provide some over-voltage protection then measuring low voltages.

Further,always try to use precision 1% tolerance resistors for R1 and R2. It might give you less (for instance 4.95V), replace the value into the code vout = (value * 5.0) / 1024.0 (ie replace the 5.0 value to the actual V reading, in this case 4.95V). Next check the 5V supply with the lab DVM at GND and 5V pins on the Arduino board.

If the display reading didn’t match when comparing with your lab DVM, use a precision DMM to find the actual resistance of R1 and R2, and replace R1=100000.0 and R2=10000.0 in the code with that values.

So, in practice, it is better to label this voltmeter as “0-30V DVM” to add a safety margin! In other words, when measuring 55V, the Arduino analog pin will be at its maximum voltage of 5V. 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. With the values used in the voltage divider it is possible to feed voltage from 0V to 55V into the Arduino board. Here, we are feeding the input voltage to the analog pin (A0) using a simple voltage divider circuit comprising resistors R1 (100K) and R2 (10K). The analog sensor on the Arduino board senses the voltage on the analog pin and converts it into a digital format that can be processed by the microcontroller. Code in the Arduino sketch is then used to compute the actual voltage being measured. The voltage divider decreases the voltage being measured to within the range of the Arduino analog inputs.

ARDUINO LIPO VOLTAGE MONITOR DRIVER

16×2 Parallel LCD ( Hitachi HD44780 driver compatible)Īs you may well know, Arduino’s analog inputs can be used to measure DC voltage between 0 and 5V (when using the standard 5V analog reference voltage) and this range can be increased by using two resistors to create a voltage divider.The Arduino board can be powered from a standard 9V battery pack, as usual. It is a simple digital voltmeter, which can safely measure input dc voltages in 0 to 30V range. Here is a useful circuit for Arduino lovers and experimenters.