Questions tagged [analogreference]
23 questions
13
votes
4 answers
Does ADC conversion to a voltage rely on the actual value of the +5 V pin?
Questions:
Does the conversion of the ADC count to voltage depend on the actual voltage of the +5 V pin?
If yes, what is the accepted method of getting that voltage from the board?
Background/Detail:
I have a circuit in which I have an Arduino…
Caribou
- 233
- 3
- 10
4
votes
3 answers
Powering the Arduino with a battery and reading the battery voltage
I am trying to display the battery voltage as it is being used to power the Arduino.
I have tried powering the Arduino through the USB and the battery voltage is read accurately when compared to the multimeter reading.
But when the battery is…
acho
- 43
- 4
3
votes
4 answers
what is arduino adc reference?
I'm using arduino for the first time and don't really understand what am I suppose to plug to the ADC refernce PIN... or if I even have to use it while plugging analog sensor to the arduino,
thanks!
Eyal Givon
2
votes
1 answer
Nature of the voltage reference instability of internal 1.1V reference of ATmega328P (Nano)
The ATmega328P data sheet in table 29-11 on page 324 notes that the internal 1.1V reference (VBG) may vary between 1.0V and 1.2V. In this answer this is called "not stable or accurate".
Question: Is this "unstable" or "inaccurate" or even both if I…
Harald
- 133
- 4
2
votes
1 answer
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 - 10.18) * (100 - 0) / (12.0 - 10.18) + 0;
return…
Aditya Singh
- 23
- 6
2
votes
1 answer
Vcc measurement with internal 1.1V reference fails on 3.3V powered Atmega328
I need to monitor a battery plugged to an ATmega running on standalone mode.
I use the "ATmega on a breadboard (8 MHz internal clock)" bootloader.
More info here
When the ATmega is powered with 5V the sketch outputs good values : arround 5100…
feuille osier
- 41
- 4
2
votes
2 answers
Arduino protecting analog input with internal voltage reference
Usually a common way to protect an analog input consists on reducing voltage and current in the following way:
Current limiting components, as Resistors or inductors and voltage limiting components as diodes, zener, tvs.
In this case for components…
piertoni
- 123
- 1
- 5
2
votes
2 answers
Can i supply the AREF pin with an Analog pin from the same board?
I guess its a dumb question but couldnt find anything about it online. I know its possible to supply the AREF pin with 3.3 V to increase the ADC resolution.
For the project i am working on the analog voltage i will be reading will be between 0 and…
Firat.Berk.Cakar
- 57
- 1
- 6
1
vote
3 answers
AREF pin on Arduino Uno R3
edit
So then, AREF can only output a voltage when used by the ADC, but not when used by the AC.
That is what I sense all your answers are pointing at, yet none has it black on white. My questions remains unmodified, below:
On the Uno R3, is the…
kellogs
- 136
- 10
1
vote
1 answer
adc arduino using reference voltage to read stable/constant lithium battery voltage
I want to read my lithium battery voltage.
I WANT TO CREATE A FUNCTION TO READ MY 3.7~4.2V,1200mAH BATTERY VOLTAGE THROUGH A MICROCONTROLLER (ARDUINO OR ATTINY44).
THEN I WANT TO CALL THE CREATED BATTERY FUNCTION IN THE FORMULA TO READ PRECISE…
electro_nooobbbb
- 45
- 5
1
vote
1 answer
Arduino , python , pyfirmata , standard firmata
Is there a way to change arduino analog reference to EXTERNAL IN PYTHON using pyfirmata or any other library ?
Necessary Links : https://www.arduino.cc/reference/en/language/functions/analog-io/analogreference/
My sensor has a 3.3 volt operating…
Shahan hasan
- 11
- 2
1
vote
1 answer
Extremely unstable analogRead() on Arduino Nano when powered from an external source
I'm doing a really simple project with an Arduino Nano and found a problem.
The circuit is a simple temperature sensor and a tension read from an analog pin everything showed on a Nokia 5110 LCD.
When the Nano is connected to the USB everything…
Roberto Aureli
- 111
- 4
1
vote
1 answer
How to work with analog readings using RPi and Firmata?
For context: I'm working on a project where I need to use sensors to figure out the current state of the environment. This process is done using an Arduino UNO and a RPi. The easiest way that I found to perform communication between both boards is…
coelhudo
- 113
- 5
1
vote
1 answer
Using Li-Poly battery to run UNO + Adafruit data logger
I want to power Arduino UNO+Adafruit data logger (https://www.adafruit.com/product/1141) with a 3.7V 2000mAh Li-Poly battery. I am providing an excitation voltage of 3V, through one of the digital pins and a potential divider arrangement, to a…
NRai
- 21
- 2
0
votes
1 answer
Arduino Uno, does a lower Aref voltage work well for measuring current? without increasing ADC integral non-linearity
I want to measure current using a Arduino Uno and use a very low resistance of 0.1Ohm or lower for the shunt resistor to measure the current(to reduce power waste and heat generation),
as a result resolution wouldn't be good at lower currents, while…
TeD van Loon
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