Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [analogreference]

The tag has no usage guidance.

1
vote
1answer
120 views

How to work with analog readings using RPi and Firmata?

For context: I'm working on a whose goal is to sense the environment. This process is done using an Arduino Uno and an RPi. The easiest way that I found to perform communication between both boards is ...
2
votes
1answer
790 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 ...
2
votes
4answers
5k 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!
0
votes
1answer
108 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
104 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
102 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
46 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
1k 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 ...
12
votes
4answers
4k views

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/...
-1
votes
2answers
959 views

Analog Reference (AREF) pin on Arduino MKR1000 not working?

Has anyone successfully used the AREF pin on MKR1000? I'm trying to use an EXTERNAL voltage reference (I need 1.5V instead of the default 5V) with: analogReference(EXTERNAL) But when I compile I ...
1
vote
2answers
370 views

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 ...
0
votes
1answer
87 views

analogRead values all over the place, while measuring light

I'm trying to detect light using an led that's already attached to the circuit. I have a flashlight shining on the led. Minimal sketch: while( true ) { int photoValue = 0; analogReference(...