Questions tagged [voltage-divider]
The voltage-divider tag has no usage guidance.
21
questions
0
votes
1answer
62 views
What resistor should I use when using a photo-resistor?
So I'm trying to use a photo-resistor and I learned that you should have a "fixed" resistor in the circuit. So my question is, what resistor should I have be the fixed resistor? My photo-...
1
vote
1answer
75 views
Battery voltage measurement with voltage divider
I am using the following circuit to measure the Li-ion 3.7V battery capacity.
Figure 1 – Schematic for 3.7 V batteries.
This setup works fine for the 3.7V batteries.
To be able to measure 9V ...
0
votes
1answer
87 views
esp8266 analogRead of 5.5V soil moisture sensor input using voltage divider
On an ESP8266 I try to analogRead(A0) my soil moisture sensor using a voltage divider but I get unexpected low values.
The MT3608 increases the esp's output voltage from 3.3V to 5.5V which is the ...
0
votes
2answers
62 views
Serial Communication between ESP8266 and Arduino ( Sofware and Hardware )
I wish to connect an Arduino ( any of 328P family ) which its 5v, with ESP8266 (ESP-01, or even NodeMCU or Wemos D1 mini ) which is 3v3 logic. My goal is that ESP8266 will be in-charge of MQTT ...
1
vote
1answer
476 views
HC-05 Module not receiving commands and not pairing
I'm working on a project where I'll need to establish a connection between two HC-05 modules, each connected to an Arduino, but for now I'm just trying to get one to work and connect to my phone, but ...
1
vote
1answer
61 views
How can I measure maximum range of my ohm meter?
Hello everyone I am working on a project that will measure ohm value of a resistor .
Schematic / article link
https://create.arduino.cc/projecthub/iasonas-christoulakis/how-to-make-an-arduino-ohm-...
4
votes
6answers
1k views
What is the most efficient voltage divider for Arduino?
I need to make voltage divider, so I could read a battery voltage up to 14.4 V. Could I use very high resistance resistors for that, so the current would be very low (to not to discharge battery)?
On ...
1
vote
1answer
50 views
esp32 voltage divider readings off
Trying to read from a voltage divider circuit using two 240 Ohm resistors. Getting a reading of 6.0, when it should be 1.65. Circuit is powered by a bench 3.3V and both the Huzzah32 and circuit are ...
2
votes
1answer
442 views
Inaccurate and non-precise voltage reading from Arduino Analog pin
float get_volt() {
rawVolt = analogRead(voltageSensor);
vOUT = (rawVolt * 4.6) / 1024.0;
vIN = vOUT / (R2/(R1+R2));
//if(vIN>12.0){vIN=12;}
//if(vIN<11.12){vIN=11.12;}
//return (vIN -...
8
votes
3answers
284 views
Measuring li-ion that arduino is running from
I am using a 5v Arduino pro mini (with regulator and power led removed).
I have been reading how to accurately measure Li-ion batteries when powering from the same battery you are trying to measure ...
-1
votes
1answer
49 views
Dynamically control the output voltage of a 60V DC input
I am hoping to control a 60V DC input source dynamically using my Arduino so that the output voltage could vary between 0v to 60v. At first i was looking into digital potential meter, however I couldn'...
-2
votes
1answer
536 views
Voltage at AREF pin
I find difficulties to measure correctly the voltage at the AREF pin.
I would measure voltages with a resolution not exceeding 1 mV . nda voltage divider
In one of my trials, I was using a 9V ...
2
votes
1answer
57 views
Thermocouple and multimeter
I've put together this script that should allow my Arduino Mega to be show thermocouple readings on the serial monitor, whilst also showing readings of voltage and ohms across a given component. I'd ...
0
votes
3answers
3k views
Voltage divider and NodeMCU inputs
Some sensors give as output a voltage between 0 and 5V. The analog inputs of the NodeMCU require voltages between 0 and 3.3V. I plan to make a voltage divider with two resistors like in this link for ...
2
votes
1answer
343 views
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
vote
1answer
3k 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 ...
1
vote
2answers
1k 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 = ...
0
votes
2answers
134 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
616 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
votes
2answers
1k 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
votes
2answers
300 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 ...
