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Questions tagged [voltage-divider]

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Measuring 12 V via voltage divider: choosing the right resistors

I want to measure a 9 V battery via one of the analog input ports of my Arduino Nano. From all the schemes of this great answer, I choose the simplest one, the voltage divider. Assuming the maximum ...
1
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1answer
53 views

How to read voltage using ADS1115

I'm very new to this. I found this tutorial. But it don't explain how to read voltages higher than Arduino 5V. I have connected a 100K ohm resistor to positive and 10K ohm to negative of my 24V power ...
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2answers
76 views

Arduino 10bit ADC is not accurate?

I'm reading the voltage with voltage divider: simulate this circuit – Schematic created using CircuitLab | Arduino is connected to both USB and a 9V adapter. float r1 = 100000; float r2 = ...
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2answers
51 views

Buzzer interfere with thermistor reading

This is how i wired the thermistor and buzzer: simulate this circuit – Schematic created using CircuitLab And the code: #define RT0 10000 #define B 3977 #define R 10000 float RT, VR, ln, TX, ...
7
votes
2answers
102 views

How to read high voltage (40-65v) from a Solar Battery bank

I would like to monitor the battery voltage of a 48v solar battery system. The expected voltage range is 40-65v. I have tried creating a voltage divider with 2 resistors but with all values I have ...
0
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2answers
162 views

Value read is not changing while rotating pot in arduino?

I am trying to read voltage using analogRead in Arduino Uno from a voltage divider circuit consisting of 1k resistor and 10k pot. The Pot used is bourns 3296. The values obtained only range from 1011 ...
0
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0answers
47 views

Making a voltmeter for PV system over 60 VDC

I'm trying to make a voltmeter for my PV system that can range from 24 VC to 120 VDC. I'm aware of the fact that we have Arduino modules available that can work for 25 VDC system. However in my case ...
0
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2answers
107 views

Would a 100KΩ resistor connected to ground pull an open analog line down to 0

I have a project that has a photoresistor wired into a voltage divider and connected through a 3.5mm “stereo mini plug”. When nothing is in the mini plug, the analog line is an open circuit, and ...