Questions tagged [signal-processing]

Use this tag if your question is related to signal processing techniques (within the Arduino's capability).

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458 views

Does Atmega-2560 support image processing capability? [closed]

As the title says can I perform image processing on Atmega-2560? Basically I have to capture real time images and detect green or red color. I have not thought of the frame rate but it is not that ...
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1answer
88 views

Get pin input status without using the arduino library

I am not allowed to use the Arduino Library (or any Library) for this program. How would I check the input of a pin? I found two different functions: In Arduino.h: #define bitRead(value, bit) (((...
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3answers
3k views

Sum values, store them and print the last value

I have a mass flow meter connected to an Arduino Uno board. I have managed to read the volume flow in L/hour, but now I'm struggling to implement a code that stores the values so that I see the number ...
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1answer
149 views

Trying to read analog signal with digital pin using outside ADC

Is there a way to route an analog signal from a simple temperature sensor through an ADC, MCP3008, into a digital pin. I have used all the analog pins on my Arduino Mega 2560 and am trying to utilize ...
2
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0answers
494 views

Real time Cross Correlation…? [closed]

I saw the one of your Answer that dated the 13th May 2015, i want to cross- correlate the vibration signal (with Predefined Signal) to remove the unwanted signals.But i want to do that real time so ...
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1answer
645 views

How to properly receive data from accelerometer @ arduino in processing and map it?

I'm busy making a project where my accelerometer @arduino can controle a ellipse @processing But the problem is, it doesn't work. With the code I have now, I can receive the data from the ...
2
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4answers
22k views

How can I generate a sinewave with Arduino Uno?

I would like to generate a sine wave with my Arduino Uno. As far as I know, there is no library for Uno to generate such a signal (correct me if I'm wrong), so the only option available is to write a ...
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1answer
348 views

how do you capture the top value in a fallen edge in analogs data (flex sensor)

Guys i'm working with a flex sensor and I'm trying to capture a specific value which is the moment before the user lets go of a flexed flex sensor and its represented as the top point of a falling ...
2
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0answers
673 views

3 square wave pulse by 120° phase shift and 3 inverted of each by Arduino

I want to make a three phase inverter (DC to AC) bridge type using Arduino. For that I want to generate three square wave each is 120° phase shifted and other three waves of main three wave forms ...
0
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1answer
2k views

Producing a sine wave with the DAC?

Its being a few days i am trying to achieve something that I dont really know if possible. Using the Samd21 chip(Arduino Zero), I am using a timer and a DAC to produce a sine wave. The required ...
2
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0answers
284 views

Problem with biased circuit for oxygen sensor (SGX EC410) [closed]

I have designed a circuit for an SGX EC410 oxygen sensor by using these application note -PAGE 4, FIGURE 4 - (http://www.sgxsensortech.com/content/uploads/2014/08/A1A-EC_SENSORS_AN2-Design-of-...
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3answers
3k views

Connect function generator to Arduino

How do I connect a function generator that generates an analog signal to an Arduino Uno? I don't know how to begin, so could you also tell me the settings for the function generator, e.g. its ...
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1answer
1k views

FFT (or similar) library for the Arduino

I'd like to build a "low fidelity" spectrum analyzer to run on an Adafruit Trinket Pro. My primary goal is to intrigue my seven year-old niece with something that can be hacked. The plan is to pick up ...
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1answer
252 views

Is it possible to create an interface between Teensy 3.2 and a DSP?

I realize that this is a forum for Arduino but since the Teensy 3.2 is compatible with the Arduino IDE I thought it would be appropriate to ask the question here. Anyway, can I create an interface ...
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1answer
103 views

Looking for circuit diagram for evaluation of a pulsed signal

How can I evaluate a pulsed signal in Arduino? The signal comes from an car alarm system and is called (-) output 200 mA. Arduino and the car have the same GND. Can I attach the output through a ...
0
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1answer
865 views

Advice on setting up a real-time audio equaliser

First time Arduino user here. We have a microphone set-up which feeds back loudly on particular frequencies and need an equalizer to (preferably automatically) detect spikes in particular frequency ...
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2answers
236 views

digitalWrite queued signals?

I have this simple code who send a signal to a android phone when I press a button: const int botonPinD = 8; const int relayPin = 12; int retardo = 100; int finBoton=1000; void setup() { ...
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3answers
382 views

Integrating an analog signal using Arduino Due

I have an 2 analog signal, and I want to calculate the difference between 2 signals (A0 and A1), then integrate an analog, but it doesn't work (I just started studying Arduino). Please could you show ...
0
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1answer
251 views

Arduino LED lighting up when signal is reading low on multimeter

My code is designed to play a tone when ever pin 3 is high on my Arduino. When I am examine the pins voltage with a multimeter it is always reading below 1 volt. When I examined the voltage off of a ...
0
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1answer
257 views

Signal sampling: losing data every 103 points when it is recorded in SD

I'm working on a system of acquisition and ECG datalogging with the Arduino, and I'm having the following problem: I'm losing data every 103 points (just 103). No matter the sampling frequency to use, ...
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1answer
3k views

Arduino Cross Correlation?

How can I write lightweight cross correlation code for arduino? I couldnt find any solution. The measurement system contains an ultrasonic sensor and a servo that turns from 45 to 135 degree and ...
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1answer
114 views

Making a composite waveform using a single TIMER interrupt

I'm writing software for a laser tag gun, which under the system we use needs the output waveform to be a carrier wave of 57600Hz with a signal wave of 1800HZ for about 50ms Using the Tone library (...
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2answers
772 views

How do I send an IR signal from an Arduino

I want to send a generic (not Sony, etc.) remote's signal from my Arduino. I have already used a IR decoder program to capture the timing of the signal: int IRsignal[] = { // ON, OFF (in 10's of ...
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0answers
480 views

Which components to built remapping keyboard via USB in + out (remapped)

I know that it's fairly easy to change the emulate keyboard and mouse by Arduino. But I'm quite specific about the goal I would like to achieve hence I would appreciate if you could advise me which ...
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3answers
3k views

How to generate Chirp Signal using Arduino

i would like to generate Chirp Signal (Frequency Sweep) using Arduino. i have searched a lot in internet but didn't find anything. Basically, any parameters is also ok. But the concept is what i am ...
5
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1answer
1k views

PWM signaling with Arduinos: What is the reason for the ground connection?

This may sound like a very dumb question and I apologise in advance. I've gone through reading about PWM and working on some example sketches to control PC fan speeds using PWM and Arduino. In all ...
2
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1answer
4k views

Sniffing RF signals

I am using an Arduino UNO and an RXb6 (I would link to the data sheet if I could find one) to try to decode a RF Signal that controls a remote outlet. I have the devices connected as you would assume ...
0
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1answer
327 views

Using Arduino audio to control an LED light

I am looking for a way to control an LED on a circuit board using audio input for learning purposes. I have written my own speech recognition system using dynamic time warping in Python, but I would ...
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1answer
173 views

How to Segment Accelerometer Signal at idle points

I'm using an 3 axis Accelerometer(GY-521) to get the acceleration data and also the gyroscope to get the gyro data. I want to segment the signals at the idle points so that i can get the segmented ...
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2answers
3k views

Necessary sampling rate

I'm using an Arduino pro mini to receive the analog signals from three sensors. I was wondering what sampling rate I should sample at in order to properly represent these signals. I know it should be ...
2
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1answer
592 views

High frequency audio sampling and storage

I want to use an arduino duemilanove atmega168 for audio signal processing. I can sample the signal at around 38.5kHz using this code. I want to send the sampled data over the serial to a computer for ...
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2answers
910 views

How to process this XBee analog pins signal?

I'm new to XBee and a colleague setup a sender/receiver pair. I'm using an usb breakout and reading the values using this java XBee API in Processing/Java. The issue I'm having is two of the pins(...
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4answers
3k views

How useful could the Arduino Yun be in computer vision in a robotics project?

I've recently ordered an Arduino Yun and several other components to begin on a small robotics project (based on an old 4x4 RC Truck). Although not mandatory for what I'd like to do, I was wondering ...
2
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1answer
132 views

Frequency will not change

I am working on a project where I am trying to get an input signal filtered according to its frequency. I checked the signal before it went into my DSP algorithm to see where the problem was and I ...
6
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3answers
11k views

How can I filter out noise from ADC lines without delay or signal change?

I'm working on a project with a joystick and I'm trying to keep everything a simple and low latency as possible. I am reading the pots with the onboard 10bit ADC on the ATmega 32u4 but may be ...
18
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4answers
23k views

Are there any signal smoothing libraries for Arduino?

I am working on a mobile robot controlled via a wireless 2.4 GHz link.The receiver is connected to the Arduino Uno which serves onboard as the main controller. The most critical (and main) input ...

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