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Questions tagged [analogread]

A standard Arduino function for detecting the voltage on an analog pin via ADC.

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1answer
55 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 ...
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1answer
48 views

Variable sets to 32767 - MATLAB Arduino

I am running out of ideas of what may be causing this problem, and I would appreciate some help identifying anything I am overlooking. Quick Problem Summary A variable gets set to 32767 quite often ...
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1answer
86 views

Cannot get esp8266 - 12 wifi module to always read analogRead incoming voltage accurately

So I have and arduino uno that is firing an output on pin 8. This code is not in this file just to be clear. From there Im taking that output and using it to fire pin 0 on the wifi module. Im using ...
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2answers
63 views

Noise on piezo analog read due to Arduino power supply

I am making a device that measures temperature and vibrations and records the values onto an SD card. It will be a standalone device. The hardware used: - Arduino Uno - PCF8523 RTC clock - MAX3186 + ...
0
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1answer
27 views

Specific ports on Teensy 3.6 not reading correct bit resolution using ADC library?

I have a basic circuit, where I'm reading analog values from 14 infrared receivers. I set the bit resolution to 16 but specific ports are returning 10 bit values (from 0 - 1024) instead of 16 bit ...
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6answers
2k 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
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2answers
284 views

ignoring potentiometer value variations

I've got a 50k potentiometer connected to an Arduino Uno. The user should adjust the hue of an Adafruit NeoPixelStrip. I've got the following code inside the loop function: int hue = analogRead(...
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1answer
24 views

Not getting any output from ECG sensor AD8232

I am trying for the beginning to run a simple Arduino code in order to test the functionality of the ECG sensor. What I am getting on the output are some random values around 600 or around 200. I ...
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1answer
20 views

Sound sensor's output stucks to high values when I include a delay in the loop function

I use Waveshare's Sound Sensor module. I use this simple code to test the module: As you can see, the problem is that when I have a delay in the program, once the analogRead is bigger than 10 (by ...
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1answer
181 views

Analog output gives a close range of values

I try to get a good range of values from VMA309 sound sensor. However, when I connect it properly it gives me a range of values +/-5 like below. The documentation says it should give numbers ...
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1answer
33 views

Mapping values from analog input giving unexpected values?

Mega 2560 I am reading in values from 3 pots then mapping them to values between 0 - 255 #define REDPIN 7 #define GREENPIN 8 #define BLUEPIN 9 int red_pot = A0; // analog pin used to connect ...
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1answer
28 views

Playing Audio from SD - Get VU, or audio waveform

I am using the library SimpleSDAudio to play a song from my SD card to an op-amp later in the circuit. I would like to take a sample from the audio pin (possibly with a Analog read) to power some ...
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0answers
40 views

Temperature varations using ADS1115 and voltage divider to read 12v

I have an issue with reading battery voltages of three 12 volt batteries using an ESP-01 and an ADS1115. I have been graphing the measurements and the all of the graphs have a temperature component ...
0
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1answer
51 views

Noisy analogRead

I'm trying to read voltage using Arduino, here's the code: float r1 = 99700; float r2 = 10004; float adc, voltage; unsigned long analog; void setup() { Serial.begin(9600); analogReference(...
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0answers
32 views

Strange cyclic errors in analogRead on Nano

I am trying to build an emergency shutdown of a gas valve based on the output of a smoke detector. It basically measures the voltage on the buzzer of the smoke detector, and if high enough, changes ...
0
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1answer
2k 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 ...
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2answers
81 views

Arduino analogRead fluctuates from sensor unless USB connected

I have an Arduino connected to a 4-20 mA sensor through a current to voltage converter. When connected to the power supply the sensor reading fluctuates, as soon as I also connect it to a USB port it ...
2
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0answers
200 views

Measuring Amplitude/Frequency of sound

I need to read an analog signal at about 500-1000Hz for at least 5 seconds. I've a battery powered microphone wired into an analog and ground pin on my arduino and am trying to measure the frequency ...
0
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2answers
323 views

Regarding PGA bypass in ADS1262

I want to bypass the PGA to change the input signal range from +/-2.5 to 0/5 V range. I have taken the reference of example given in this library. I have interfaced protocentral-ads1262-32-bit-...
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2answers
51 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, ...
2
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2answers
2k views

Safely enabling voltage divider on a 12V battery

I'm planning to monitor voltage of a 12V battery with an Arduino's ADC pin connected via a voltage divider. Since I don't want the circuit itself to drain the battery when not in use, I want to use a ...
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0answers
20 views

ESP32 PH probe analogRead Value Alternating

i got an ESP32 WROOM32-OLED with a PH-Probe hooked up to it (PIN39). When i short the probe interfcace to get a PH07 reading (connecting the middle of the probe interface to ground) i get really ...
0
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1answer
210 views

Why does analog sensor “hum” when plugged into common ground?

I have the ground for an SD card module, LED, and piezo sensor all plugged into the same ground rail. When doing this I get a low "hum" in the piezo readings where instead of reading ground voltage (0)...
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1answer
22 views

Increasing range of a DC-offset signal (software)

I am trying to read a signal with a DC offset of 511 (as seen by the ADC). The signal's tiny with regards to the offset, and I'm feeding it to a library that does a Fourier transform on it. It comes ...
0
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1answer
32 views

Using case statement with IR emitter reciever

I am trying to use two "infrared obstacle avoidance modules" to work with the following sketch. From all my research, I believe, a case statement is my best option because, (I understand) the sketch ...
0
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0answers
43 views

Can HC-05 Continuously Stream data and read data at the same time?

I am trying to have my Arduino Stream an Analog Signal using Bluetooth Module (HC-05) while being able to read commands from another Micro-controller using the same Bluetooth Module. Currently, I am ...
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5answers
9k views

AnalogRead always 1023 on Arduino Due?

Just using the Basic Example AnalogReadSerial. // the setup routine runs once when you press reset: void setup() { // initialize serial communication at 9600 bits per second: Serial.begin(9600)...
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2answers
50 views

Why do all analog pins measure the same value?

I measure 2 analog pins: A4 and A5. The A5 pin is connected to another Arduino's digital out (through a 10k resistor) which has a simple program: 5ms on and 100ms off. The A4 pin is not connected ...
0
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2answers
29 views

Calculate statistic in EEPROM

I've search on how to do statistic calculation in EEPROM, but non related. The data that I stored in EEPROM is body temperature. Currently I stored the data using float. Below is my code for data ...
0
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1answer
40 views

analogRead Function AC Voltage Reading Capabilities

Usually when you sense AC voltage, you get a sinusoidal waveform. However, for AC voltage sources, Arduino analogRead ( ) only presents positive voltage values. So what's basically happening? Is it ...
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1answer
56 views

AC Voltage Sensing using Arduino Uno

Is it possible to sense AC Voltage using analog input for Arduino Uno or can it only read DC? I mean I've tried connecting an AC voltage source to analog and I'm reading some numbers. However, I don'...
1
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1answer
86 views

analogRead() output oscillates even though the pin is grounded

I'm using Arduino Micro to read from 5 flex sensors and display the corresponding angles to the Serial monitor. I am currently having quite some problems with the oscillating values I am getting from ...
0
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2answers
2k views

Arduino Micro + Max4466 - Noise on A0

I've got an Arduino Micro, and a MAX4466 ECM / AMP breakout board (https://www.adafruit.com/product/1063). I'm powering the Arduino Micro from the USB port. On the MAX4466 (to the Arduino), I've ...
0
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1answer
63 views

Help combining digital and analog code in arduino programming

So I'm making a device that does 3 things, Measures frequency of an audio signal through a microphone Checks whether there is a weight placed on a pressure pad (my pressure sensor works through the ...
1
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0answers
311 views

How to use Honeywell NBP Series Sensor with Arduino

I am trying to use a HONEYWELL NBPDANN100PAUNV Pressure Sensor. I found an example here http://www.circuitstoday.com/interfacing-pressure-sensor-arduino As this example says as instrumentation ...
2
votes
3answers
1k 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. ...
1
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0answers
97 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....
1
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1answer
29 views

Electret microphone board strange offset using Arduino

I'm experimenting with an electret microphone, specifically this one. I put it on my scope and I see what I expect - a really small voltage, typically under 20mV, that varies appropriately with sound....
2
votes
0answers
169 views

Uno Ethernet shield and TMP36 reading

I am just getting started with my Uno via the Vilros Ultimate Starter Kit. I've done all of the sample circuits and played around with a few other things. Today I connected the Ethernet shield with ...
0
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2answers
160 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
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2answers
52 views

How to drive Arduino UNO as a counter triggered by 555 timer's output (astable mode)

I have an Arduino Uno and a 555 timer configured to astable mode. What I'm trying to do is to program my Arduino to increase a "counter" variable (counter++) everytime it gets triggered by 555 timer'...
0
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1answer
58 views

How to convert digital signal to analog value

I have spwm output from arduino, and when i read on analogread it shows only 1023 and 0, because it is digital signal. Is there any way to convert these spwm value into analog value reading
0
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0answers
21 views

Why UDP does not work after analogRead() on esp8266-12N module? [duplicate]

Consider my loop() in Arduino be: void loop(){ for(int i = 0; i<100; i++){ Value[i] = analogRead(A0); delayMicroseconds(62); } //delay(2) //when I use this line esp8266 works properly ...
1
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1answer
761 views

Problems with ACS758 Hall Effect Current Sensors - Calibration and no Signal

I purchased 3 ACS758 Hall Effect Current Sensors datasheet on ebay. A 50,100 and 200A, all three are bi-directional. They look like this. With no current the 50A outputs 477 on the analogue input (2....
2
votes
1answer
4k views

error: 'analogRead' was not declared in this scope

I am using Codeblocks with arduino IDE to simulate the control of a stepper motor, and the errors "'analogRead' was not declared in this scope" and "'A0' was not declared in this scope" keep popping. ...
0
votes
1answer
53 views

Analog reading with noise - Arduino Uno VS ESP12e

I was testing analog output from a microphone (Max9814) with an Arduino Uno, which came with nice results. The output provided by the microphone is converted into sound and is loud and clear. Setup: (...
2
votes
1answer
108 views

Ardunio Mega/ATmega2560: Using Port F or K for both analog inputs and digital outputs

On an ATmega2560, can ports have some pins used for analog inputs but others as digtial i/o? Specifically, I only need to use 3-5 analog inputs but have many digital inputs. I would like to use the ...
1
vote
2answers
1k 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 ...
0
votes
1answer
85 views

Measure small capacitances with ATtiny85 (Digispark board)

I have successfully run the code provided here on an Arduino Nano. If nothing is connected, it will output a very small capacitance (~ 1 pF). Then I tried to migrate the code to the ATtiny85 (using ...
0
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1answer
83 views

making power harmonics analyser which will measure the amplitudes of the fundamental and its multiples (like 50hz, 100hz, 150hz,200 hz,…) there are)

i have been intendng to make a power frequency harmonics analyser which will measure the amplitudes of the fundamental and its multiples (like 50hz, 100hz, 150hz,200 hz,...) there are examples for ...