Arduino

Questions tagged [analog]

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Electronic devices with a continuously variable signal. The term "analogue" describes the proportional relationship between a signal and a voltage or current that represents the signal.

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How to connect an lcd i2c using only pins A0 and A1 (SDA, SCL, GND, and VCC are given)

I want to know how to connect an lcd i2c, with an led 8x8 matrix at the same time. The problem is, all the analog in pins are used, except A0 and A1. Using this tutorial: https://www.makerguides.com/...
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1answer
45 views

How to read an analog value on ESP32-CAM with the SD card reader enabled?

I use an ESP32-Cam module for a project for which I need both the SD card and the cam. According to this page, the only pins that are not in use by either the camera or the SD card reader are GPIO0, ...
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1answer
61 views

Analog input voltage rises when motor is working

I'm making automatic water plant system. I'm using: Arduino Uno 3.3-6V water pump -https://www.amazon.com/Vipe-Micro-Submersible-Motor-Water/dp/B01N0X3CW4 Capacitive soil moisture sensor - https://www....
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2answers
73 views

How can I add a potentiometer and more buttons to my custom game controller?

I'm new to using Arduino, and know next to nothing about programming. I'm currently trying to add a potentiometer, and possibly a few more button inputs to my 3D-printed guitar controller project It ...
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4answers
123 views

Can I control LED brightness with potentiometer without any code, as well as reading the potentiometer value?

I am just getting back into electronics and have started to play around with making my own button box. I am trying to control an LED's brightness using a potentiometer, while also reading the ...
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2answers
314 views

Multiple Push buttons to one input

So I am trying to use one input to control an LCD display. The goal being that once one of the buttons is pressed it delivers a message. I have watched quite a few tutorials and can get the program to ...
2
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1answer
59 views

Noise in Analog Read Serial from an instrumentation amplifier(ina122p)

I am trying to read the values from a simple EMG circuit (with an INA122P) using the analogRead() and plotting in the plotter using an Arduino nano v3. I am powering the ina1222p from the 5v pin of ...
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0answers
39 views

Triggering a Sleep Wake-up Event using analog output from a triple axis accelerometer?

I am working on a project that uses a Arduino MKR GSM 1400 and a ADXL335 Accelerometer . I am having trouble setting a interrupt wake up event on one of the GSM's interrupt-capable pin due to the ...
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3answers
78 views

Continuous voltage on IO Pins while 5V is not Connected?

i have a small project where i just sucessfully destroyed my frist of 5 Digisparks (Attiny85). In the Picture you see the Cirucit. I have 2 Liion cells connected in series to get high enough voltage ...
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0answers
68 views

Convert 1-5V to 4-20mA using Arduino

I am trying to convert 1-5V to 0-20mA which is then used to drive VFD. Actually, I want 1-5V Variable output from Arduino. I am using PWM but its output 0V or 5V depending upon the duty cycle. Is ...
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2answers
200 views

Boost an audio signal for analog read - Envelope Detector

I'm working on my first Arduino project and I have a sensitivity issue. I'm building a module to listen to an audio signal and to start the power source of my speaker with a relay. Everything seems ...
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2answers
76 views

Connecting two sensors to one analog pin

I am completely new to programming with Arduino so please bear with me if this seems stupid. I am using an Arduino Uno R3. I have two sensors, a Soil Moisture sensor and an LDR Light Sensor. Both ...
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1answer
787 views

DHT11 analog or digital?

I saw some projects with DHT11, some connect it with analog pin, others connect with digital pin. Is there any difference / advantage connecting to the analog?
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1answer
173 views

How to find the peak value of analog signal?

I have a question .. Please help me I don't know how Arduino can read the peak value of the sensor signal. The value I want is in the ADC value .. What I want is ... for 5 seconds there will be 1 ...
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0answers
103 views

Can't figure out source of interference reading 10k POTs with 74HC4051

I realize this gets asked a lot, but I feel like I've applied the most common fixes without success. I have 10 10k potentiometers plugged in to an arduino via a custom shield. 2 are wired directly to ...
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2answers
179 views

ADC register always returning high

Regardless of whatever voltage at A0, the software is always returning high (1023) volatile unsigned char* ADmux = (unsigned char*) 0x7C; volatile unsigned char* ADCSRa = (unsigned char*) 0x7A; ...
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1answer
88 views

How to Measure many voltages (Uno) - Analog extenders a good option?

I am trying to make a battery capacity tester (3.7v li-ion 18650 battery) using arduino uno. If possible i'd like to test 20 or more batteries at the same time. I need to measure the voltage of each ...
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2answers
346 views

Is AREF a stable output Ref voltage with analogReference(INTERNAL)

I'm using an analog input on a NANO board to measure the midpoint between two photo resistive (Cadmium) cells, with the two outside ends tied to GND and a source voltage. Basically a simple voltage ...