Questions tagged [analogread]
A standard Arduino function for detecting the voltage on an analog pin via ADC.
272
questions
2
votes
2answers
200 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(...
-1
votes
1answer
19 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 ...
0
votes
1answer
32 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 ...
0
votes
0answers
33 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
votes
1answer
45 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(...
0
votes
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
votes
1answer
27 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 ...
0
votes
1answer
19 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 ...
0
votes
2answers
47 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, ...
0
votes
0answers
18 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
votes
1answer
20 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
votes
0answers
41 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 ...
1
vote
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
votes
1answer
27 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
votes
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
votes
1answer
29 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 ...
-1
votes
1answer
52 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
vote
1answer
81 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
votes
1answer
59 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
vote
1answer
25 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....
0
votes
2answers
133 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
votes
2answers
46 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
votes
1answer
56 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
votes
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
...
0
votes
1answer
44 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
100 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 ...
2
votes
0answers
174 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
votes
1answer
79 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 ...
0
votes
1answer
82 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
votes
2answers
110 views
What data type are the analog pin labels (A0, A1, etc)?
Arduino Mega
I would like to have an array containing analog pin labels something like...
int analog_pins[] = {A0, A1, A2, A3};
int num_analog_pins = sizeof(analog_pins) / sizeof(analog_pins[0]);
...
1
vote
1answer
44 views
How to read analog pins from a second Arduino
I've run out of analog pins on Arduino Uno and don't have time to order new parts. I've heard you can connect two Arduinos and I have access to another UNO. If I did that, could I read the analog pins ...
0
votes
2answers
73 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 ...
0
votes
1answer
45 views
Can I read using an analog pin on an arduino Mega whether or not there is a high (5v) voltage on a wire from another board's digital pin?
I am making a peer-to-peer network of initiating devices and a common hub, which controls most of the hardware. It sends a number over Serial to Mega's Serial1 (Mega's Serial is used for communicating ...
0
votes
2answers
99 views
Would a 100KΩ resistor connected to ground pull an open analog line down to 0
I have a project that has a photoresistor wired into a voltage divider and connected through a 3.5mm “stereo mini plug”. When nothing is in the mini plug, the analog line is an open circuit, and ...
0
votes
1answer
32 views
How to map integer values and round to a count of tens/thousands?
I'm mapping a potentiometer from 0-1023 to 1000-120000 (1 sec to 2 minutes) for a timer, like:
maxDelay = map (pot2, 0, 1023, 1000, 120000);
Both variables are integers. Now I would like to convert/...
0
votes
1answer
203 views
How to re-construct audio from series of analog integer input?
I'm trying to learn how to stream audio from the A0 pin of an ESP8266 NodeMCU board via UDP socket connection over to another windows computer that uses pyaudio to play it. At the moment, all I get ...
1
vote
2answers
257 views
AnalogRead value constant for a varying voltage (for LED brightness variation)
Having the 11~ pin on OUTPUT mode that delivers a varying voltage (from 0 to 5 : 0 to 255).
and the A0 pin on INPUT mode to read the voltage, I find that the value read by A0 being either 0 or 1016 ...
0
votes
1answer
159 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 ...
0
votes
2answers
2k views
Reading Multiple Analog Input Pins
I am having a bit of trouble trying to read multiple Analog Input Pins (A0 and A3, in this instance). I am using a Pololu A-Star 32U4 LV Robot Controller (https://www.pololu.com/product/3116), and am ...
0
votes
1answer
73 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 ...
0
votes
0answers
34 views
Differing behaviour from Arduino Nano when plugged into laptop vs power source
Well here's a weird one. I'm monitoring a mic on an analog pin of an Arduino Nano and using the variation in voltage to control and LED.
When plugged in to my Laptop (USB 3, 500ma available, the ...
0
votes
1answer
88 views
Reading analog value while generating PWM signal
I'm trying to generate dim two LED strips simultaneously by generating two PWM signals based on potentionmeter value. The pot sets how bright each of the LED strips will be. To drive this I'm using ...
0
votes
1answer
278 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 (...
1
vote
4answers
361 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 ...
-1
votes
2answers
360 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 ...
1
vote
2answers
89 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/...
1
vote
1answer
209 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 ...
0
votes
1answer
248 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 ...
1
vote
2answers
91 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 ...
0
votes
1answer
1k 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 ...
