Questions tagged [analogread]
A standard Arduino function for detecting the voltage on an analog pin via ADC.
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1answer
68 views
Unstable analog sensor readout
I have the Arduino Uno (non-original replica) board, general SPI lcd, and GUVA-S12SD analog UV sensor module.
The board (powered via USB) reads the data from the analog pin 0, converts it to voltage (...
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4answers
131 views
How to boil down analog input to just three cases?
I am investigating the use of a 3-position-switch for one of my projects to switch between different settings using just one analog input pin. For the three positions I am using ground/0V, ~2.5V (via ...
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2answers
45 views
Can a 150 PSI Pressure Transducer accurately measure up to 30 - 40 PSI? [closed]
I have an Arduino project which requires reading pressure data from a pipe. The best pressure transducer I have been able to find is this one.
Seeing as though its max pressure is 150/200 PSI, will ...
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0answers
26 views
Correct Thermistor readings on battery-powered Arduino Pro Mini?
How to read proper value of thermistor on battery-powered Arduino Pro Mini 8Mhz/3.3V? Do I need some "reference" voltage?
The value changes when voltage changes, like:
battery voltage drop
...
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2answers
44 views
How would I go about measuring an analog signal on my arduino mega that has both positive and negative voltages
I have a signal that fluctuates between -70mV and 50mV. How would I get the arduino to read this.. Ultimately I am trying to graph the data in real time so it looks like this.
https://imgur.com/a/...
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1answer
46 views
Differing Serial Values Between Arduino Uno and TTGO ESP32 SX1276
I'm wanting to analogRead the value off a MQ-135 gas sensor. I have tired this with both an Arduino Uno and an TTGO ESP32 SX1276.
When reading the value of the sensor off the Uno, I get values ...
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1answer
34 views
Arduino Due ADC negative voltage
I’m trying to sample an AC signal on the Arduino Due. The AC signal will never exceed +-80mv across a frequency range of 6-833Hz. Current is negligible.
I believe there are clamping diodes to protect ...
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2answers
84 views
arduino firmware
Hi I was wondering if there is any way to/ how I might go about solving the following.
I am designing my own arduino board based on a mega32u4 chip and I want my arduino board to light up an ...
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1answer
84 views
Read frequency of input in digital pins
This is a somewhat theoretical question:
Let's say I have some sensor that sends digital signals to one of Arduino's digital ports.
Now, I don't know the frequency it sends those signals in.
For ...
6
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2answers
75 views
How can I differentiate between multiple circuits?
I'm building a puzzle for an escape room. I want to give the user 6 wires and 6 terminals, then confirm that they've connected the correct wires to the correct terminals (one-to-one).
My first (...
3
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1answer
384 views
How can I create a battery level circuit
Im trying to create a circuit so that I can monitor the voltage drop on my battery and send an message when the voltage drop reaches the drop out. But I'm having some problems with my voltage ...
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1answer
40 views
Why does reading an analog pin give a different results when interfacing with Processing?
I am interested in measuring the voltage over an analog pin (A6). When I use the Arduino IDE to print the results through the serial I get values around 300.
Here's the code
void setup(){
Serial....
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1answer
110 views
Analog inputs showing value even there is nothing connected to it [duplicate]
After watching something weird on the serial monitor I wrote a simple code to monitor the analog pin input values. There was nothing connected to the analog pins still they where showing decimal ...
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1answer
28 views
If I use a biasing circuit for a signal going into an analog input pin, will it affect the ADC operation?
If I have a single 100Hz AC signal biased by two 1 M-ohm resistors (as per schematic below), and then output to an Arduino UNO analog input pin, with the UNO sampling at around 1 kHz using delays, ...
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0answers
179 views
avrdude Programmer is not responding Mac
I'm VERY new to Arduino programs.
I'm trying to upload the AnalogInOutSerial example to my Arduino, however, I keep getting an error saying that there is a problem uploading to the board.
Thank you ...
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1answer
418 views
Read both battery voltage and analog sensor value with NodeMCU ESP8266
I have a soil sensor that reports value once every 5 minutes, deepsleep in between.
Is there a way to also report battery voltage (with ESP.getVcc())?
To get the battery voltage reading to work I ...
0
votes
1answer
20 views
Arduino Micro interference between analog inputs
I'm building a MIDI controller with the Arduino Micro, hooking a bunch of knobs up to the analog inputs. Currently, I'm getting analog in 9 being influenced by analog in 10: analogRead(9) returns a ...
1
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1answer
54 views
Strange behavior on bitwise operation
i am trying to write a simple program that writes the outputs of an accelerometer (which comes down to 3 analog inputs) onto an SD-Card.
I got the hole thing working fine (sending the values as ...
1
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1answer
83 views
Why do you need to shift bits when reading from an analog sensor? [closed]
I was playing around with some analog grove sensors and looking at examples (https://github.com/DexterInd/GrovePi/blob/master/Software/Go/grovepi/grovepi.go - this specific example is in go and for ...
0
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1answer
133 views
Interaction between Analog Pins when measuring a DC voltage- a common issue? [duplicate]
Just set up a replacement "Piduino" - a RPi3 connected by USB to an Arduino Uno. The previous one was the victim of a Diet Big Gulp - spilled on the voltage divider breadboard. Whoops. The tiny ...
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1answer
170 views
analogRead() inside a loop always returns 0
I wrote Arduino code to receive analog input from different voltage dividers connected to four pins (A0 to A4) and analog input from a temperature sensor (LM35) to A5. analogRead inside the for loop ...
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1answer
164 views
Non-blocking analogRead
In my recent project, I'm working with the motor. I have to drive the motor for the specific time like for 2 minutes, 3 minutes, 4 minutes and 5 minutes. I already created functions for that. And ...
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4answers
261 views
What is the lowest resistance pot that is useful with an analog input?
Background
I've dabbled in electronics since my parents gave me a 150-in-1 kit in the 1970's but never had formal training. My dad repaired Honeywell mainframes so taught me to solder when I was 8. I ...
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2answers
39 views
analog read only once a time
I was working on a school project in where i need to analog read form A0 and test if my value is bigger than some boundary (500 for example) to return 0 or 1
well with a simple code in an infinity ...
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2answers
531 views
How to measure the supply voltage of Arduino without using an analog pin
I'm using Arduino Nano to measure temperature with a 10 kohm thermistor and a voltage divider. My problem is I'm getting only 4.2V on the 5V pin. The power is supplied via a USB cable from a desktop ...
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1answer
194 views
Getting the voltage of an 18650 battery with an Arduino
I'm using a Arduino Pro Mini (5v) to sense the voltage of an 18650 battery. The battery (that is being sensed)is also used to power the Pro Mini but the MCU is behind a boost-converter which outputs 5....
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1answer
89 views
Two-wire Conductivity Sensor and Arduino Hook-up?
For the conductivity meter shown in the photo below, it is a non-NPN sensor for measuring conductivity / impedance.
I am trying to figure out the best method for measuring the output of the sensor ...
3
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4answers
78 views
Build a timer that starts and stops timing when 2 wires are broken
I need to build a timer that uses the breaking of copper strips to trigger its starting and stopping. The intention is to measure the speed of a rocket with this - it will break the first wire, ...
0
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1answer
52 views
UNO: AnalogRead results not as expected
I'm new to Arduino, and trying to build a project that will measure the voltage and current from two, unconnected, 12v batteries. The present test environment comprises:-
a 13.8v power supply (run ...
0
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0answers
41 views
Can I both drive a DC Motor and then read if its generating power (spinning),
This is what I am trying to do :
I want a DC Motor to pull a string by rewind it, and then if I unwind the string by pulling it, it will generate power that will be read by the arduino, to trigger ( ...
1
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1answer
148 views
bit_is_clear(ACSR, ACO) Instead of digital_read(1)==LOW
I am attempting to create a program for the atmega328P which will enable the aux input of a Toyota Corolla stereo. In order to do this, I'm bitbanging AVC LAN. Nearly all of my research comes from ...
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2answers
52 views
Arduino Voltage Divider
So am doing a project which involves the reading of voltage and current generated by Solar Panel. Now I learnt that Arduino cant Read Voltage directly above 5V. To read above that you need to add a ...
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1answer
72 views
Arduino UNO - analogRead() returning mixed results
I have created a small circuit with a 220 Ohm resistor and a LED connected to PIN9 for power.
I want to measure the Voltage of the current flowing through the circuit. In order to do that I connected ...
0
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1answer
94 views
Connecting two analog multiplexers (CD4051b)
Is it possible to connect two CD4051b analog multiplexers together so that I can receive 14 analog inputs through them? Just by using one analog pin and three digital pins on the Arduino UNO.
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4answers
922 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!
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0answers
29 views
Analog Read gives Erratic behaviour in Struct
I'm getting some very strange behaviour from a Haptic feedback system I'm trying to make.
The test code works fine as a Multiple-In One-Out in the main loop, but once I moved the code to the Struct, I ...
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2answers
200 views
Lowest voltage applicable on AREF pin on Uno and Mega
I need to measure an Analog signal in the range of 5-30 mV.
Naturally, using the internal default 5V reference leads to very poor measurement resolution. I would like to use the capability to use an ...
1
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1answer
505 views
Problem opening multiple text files simultaneously/in-order using <SD.h>
I am looking to log analog sensor data using 3 pins, A1, A2, A3. My project requires continuous mapping of data, and hence an SD card shield was necessary. However, I need to log the incoming data ...
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1answer
76 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 ...
1
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3answers
283 views
Analog input draws current when Arduino is turned off
I am using a Arduino Pro Micro from SparkFun (similar to Arduino Leonardo, cpu: Atmega 32u4). It has a analog input: A0, which I use to keep track of the battery voltage in my battery powered project (...
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1answer
3k views
Arduino continuously reading ADC value using interrupt
I have a mono jack audio act as analog input for arduino UNO. The microphone outputs voltage that varies in terms of amplitude (volume) and frequency. In order to get the high sampling rate, I use ...
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votes
2answers
815 views
Fluctuating readings of LM35 temperature sensor (+- 5°C) with Arduino UNO
I am trying to read a LM35 temperature sensor with Arduino UNO which I got as a gift.
The issue is the fact, that my readings of sensor are, well, suspicious at least - they jump with each reading ...
2
votes
2answers
161 views
Mixing analog reads with raw port reads
I'm reading two digital inputs and one analog input. For [reasons] I must use A0 and A1 as digital ins, and A2 as an analog in.
I'm uncertain about how the Arduino hardware deals with mixing analog ...
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2answers
128 views
Decode VGA port by Arduino [closed]
Is it possible to read somehow VGA port of graphics card by Arduino? Even with some minimal 320 x 240 resolution and minimal frame rate per second, to convert pixels into numbers (for example) somehow....
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0answers
63 views
Serial.println cuts off first digit
I'm trying to perform a simple analogRead() and print out the result, as below:
void getVoltMeter() {
readValue = analogRead(A2);
readByte = readValue/4;
Serial.println(readValue);
Serial....
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3answers
991 views
Reading an output analog pin with an input analog pin
I am having a hard time understanding why I can't read one analog pin's output with another analog pin. The docs state to put a delay in between, which I've done (I've tried up to one second with the ...
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3answers
494 views
Analog thermistor readings are wrong
There are some discrepancies between what is read by the analog channel for a thermistor, ohms values directly obtained on the thermistor using an ohmmeter, and another digital temperature sensor.
...
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2answers
85 views
for loop reads pots, passes value to PWM pins, can this be in the same for loop?
In the code below I am using a for loop to iterate over analog pins (potentiometers) and pass their value, after being mapped, to PWM enabled analog output pins (currently controlling LED brightness). ...
2
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2answers
515 views
Read Audio Data in Real-time over 3.5mm Stereo Cable
My Goal
Have Arduino read audio output from a TRS stereo audio cable (coming from a computer, smartphone, etc.). As motivation for this use-case, once some audio data (depending on the sample rate) ...
0
votes
1answer
155 views
Oscillating Analog Readings
I am using a JIC 139 UV Sensor (datasheet) with an Arduino Mega 2560 and should be reading smooth curves as I bring a UV source to towards the sensor. Instead, my curves are increasing and oscillating....
