Questions tagged [analogreference]
The analogreference tag has no usage guidance.
19
questions
2
votes
1answer
76 views
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".
...
1
vote
1answer
69 views
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/...
2
votes
1answer
436 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 -...
1
vote
1answer
106 views
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 ...
0
votes
1answer
127 views
analogReference(INTERNAL) configuration
I need some help because I did not understand the configuration analogReference(INTERNAL).
I would measure the intensity of a Laser beam passing through a filter. This is the circuit I would implement,...
-2
votes
1answer
534 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 ...
0
votes
2answers
630 views
Is AREF a stable output Ref voltage with analogReference(INTERNAL)
I'm using an analog input on a NANO board to measure the midpoint between two photo resistive (Cadmium) cells, with the two outside ends tied to GND and a source voltage. Basically a simple voltage ...
1
vote
1answer
384 views
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 ...
2
votes
1answer
2k views
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 ...
3
votes
4answers
13k views
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!
-1
votes
1answer
149 views
External ADC reference when using MATLAB support package for Arduino
I am using the MATLAB support package for Arduino.
However, I need to configure the ADC reference to external. MATLAB documentation doesn't really explain how to do this?
Is there any way I can use ...
0
votes
1answer
211 views
Non intrusive current sensor with unreliable (strange) readings
I have a project where I will mount 6 non intrusive current sensor model SCT013 (100A/50mA) manufactured by yhdc.com on an Arduino Mega.
Virtual ground and Burden resistors are 1% tolerance.
To ...
0
votes
1answer
126 views
Voltage divider for 6 non intrusive current sensors
I have an Arduino project where I intend to use 6 non intrusive current sensor model SCT013 (100A/50mA) manufactured by yhdc.com
As reference voltage on examples I find at the internet it is ...
1
vote
1answer
52 views
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 ...
1
vote
2answers
3k views
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 ...
