Questions tagged [analogread]

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

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69 views

Reliably using analogRead as a compact digitalRead

My goal is to reduce pins being used for micro-controllers with limited pins, or projects requiring a few different digital input values. How I intend to do so is by using ADC pins to gather four ...
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507 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 ...
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112 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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452 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 ...
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178 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 ...
2
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0answers
467 views

Accuracy reading two analog inputs on Arduino

I need a help with this question. I'm trying to make a Wheatstone Bridge with Arduino, the main idea is read the two legs of the circuit with two analog inputs of Arduino, for the while I'm analyzing ...
2
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1answer
6k 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. ...
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45 views

Phantom reading

my project is to control led diode and dc motor, test shield buttons, and check system run time. Testing buttons and run time i have done. Deal is with led and dc motor control. I'm getting phantom ...
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29 views

Does anybodyknow how to program Muscle Sensors v3?

#include <Servo.h> const int x = 200 //Naming the servosServo Servo servo1; Servo servo2; Servo servo3; Servo servo4; Servo servo5; Servo servo6; void setup() { Serial.begin(9600); ...
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0answers
44 views

How to calibrate Arduino DUE analog readings?

I am having a problem with the analog readings on my Due. On pin A4 and A5 I am measuring voltages: double vcc = 3.288 // taken on pin 75 (ADVREF) ; analogReadResolution(12); result = analogRead(A4) ...
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1k views

Using ESP32 to measure vbat

I'm using ESP32 to read an analog value of a liPo battery (3.7v-4.2v). Since ESP32 DAC's is 3.3v I'm using a voltage divider ( 2x10K resistors ), to split bat's voltage into ESP's GPIO36. So far ...
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92 views

Need help in the problem with analog input readings and RTC DS3231

I have 3 analog input(0-1024). I want two outputs based on levels of analog inputs. Eg. inputs have 2 levels. for A0 at 300,digital output pin3 turns ON; and A0 at 500, digital output pin 4 turns ON. ...
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108 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 ...
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36 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 ...
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0answers
154 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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0answers
826 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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0answers
48 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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1answer
147 views

Can I hook up an Analog multiplexer to Arduino Nano?

I want to increase the analogue inputs for the Nano. So is it possible to hook up a CD74HC4067 analog multiplexer to it? Thanks.
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0answers
325 views

How to generate Analog Signal (Voice) to the microphone

I have question about microphone and generating sound signal. I have microphone in my intercom at home. It is simple analog microphone, not digital. What I want is to connect arduino analog ...
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0answers
41 views

Bridge */arduino/analog/2 returns a blank page

Had some start up difficulties. But updated the YUN and IDE to the latest version. Using * "/arduino/digital/13/1" works as supposed (turns on the LED) - it's just a bit slow. But I can't see why ...
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767 views

ICP Accelometer Arduino

I need to connect piezoelectric accelerometer to Arduino. Precisely, it's this one: http://www.pcb.com/Products.aspx?m=352C34 Specs show that it generates 100 mV/g, but when I connected it between ...
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0answers
1k views

Get a internal temperatura form ATMega328

I am making a circuit which takes three kinds of monitor temperature of the chip itself, in this case ATMega328 at room temperature, which is influenced by external thinks such as lasers, which will ...
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1answer
51 views

analogRead() doesn't read more than 500Hz

I connected a wave generator to the analog pins to read the frequencies of the waves generated. I used different frequencies of sine waves with a minimum of 0V and maximum of 5V. Whenever the voltage ...
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35 views

Extremely bad analog read on ESP32 while using 433MHz module

I'm currently trying to transmit data from one ESP32 to another with 433MHz modules. I also need to read some sensor readings from an Hall sensor. When the ESP32 that sends is not connected the values ...
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31 views

Connect k-type termocouple using o-amp

first of all I have to say that this is my first Arduino thing. I'm trying to connect a k-type termocouple to my Arduino using an LM2904 Oamp, Yes I know that this is not the best solution but is the ...
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51 views

how to write freerun analog samples to a file on MacOS

I've only just managed to get the Arduino IDE on MacOS set up with my ESP8266 board. My loop is running and I can see the lovely serial output in the Serial Monitor window in the Arduino IDE. I'm ...
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117 views

eps32 bad adc even with external adc (ADS1115)

Im trying to read an analog value with my esp32 and send it over wifi to another esp32. The wifi part works flawless, however when i try to read an analog value form the esp32 its not useable. It ...
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43 views

Problem with Reading Multiple Analog Values From ESP8266 NodeMCU

I am using ESP8266 nodemcu with ADS1115, but values are totally wrong. Why this happened? Is there any solution to extends the Node MCU 8266 pins with accurate sensor values ?
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1answer
464 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
172 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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50 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 ...
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472 views

Arduino reading its own voltage wrong

I have made a PCB where I am using atmega328p (Arduino IC) to read some voltages. I have written its code in arduino software. I am giving voltage first to a voltage divider circuit and then to the A0....
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46 views

Arduino Robot motors disabled when AnalogInput is connected

I have attached a solar panel to the Arduino Robot, connecting the - to the TK3 Input GND, and the + to the TK3 Input Analog Pin. I want to turn the robot around and "scan" the voltage. But the motors ...
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39 views

Why does setting a digital pin to INPUT make one of my analogue pins into a digital input

I have connected four sensors to four of the analogue inputs and I can read the values they return just fine, it all works. However, I also need a digital input and when I set the mode of one of the ...
-1
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1answer
128 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 ...
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1answer
186 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'...
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2answers
177 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 ...
-1
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1answer
141 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 ...