Questions tagged [frequency]

Defines how often something occurs, such as pulses in a digital signal, or oscillations in a radio wave.

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27 views

How to run atmega328p at 8, 4 and 1 mhz?

Instead of using the regular Arduino board I have purchased the atmega328p-pu along with this components: 22pf ceramic capacitor 10K resistor 16mhz crystal 47uF capacitor 3.3 Volts Power supply The ...
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2answers
39 views

How can arduino read a frequency higher than 16Mhz?

I will like to understand how does Arduino measure a frequency. Also how does my voltmeter can measure a frequency as well. Since I am a beginner on using microcontroler I would read a frequency like ...
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1answer
83 views

Fading LED with different frequencies

I have a potentiometer attached to one analog port of arduino (assume A0) I'm reading the value of that using input_voltage = analogRead (A0); which is a value between 0-1023. So I want to map this ...
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2answers
51 views

Clock frequency VS cycle time

I am considering switching from Arduino Pro Mini 5V 16MHz to Arduino Pro Mini 3.3V 8Mhz for some project because I would like to run it with a 4.5V input power. Will the switch from 16 to 8Mhz double ...
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1answer
30 views

Will an Arduino UNO operating at 16mHz communicate with UART / I2C with an STM32 operating at a different frequency?

I plan to connect Arduino UNO via I2C / UART with a controller based on STM32F334K8T6, whose frequency will be about 20mHz or higher. Tell me, does the difference in clock frequencies of ...
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0answers
34 views

Frequency Doesn't increase when Button Is Pressed

I’m trying to output a frequency that can be increased and decreased by using 2 buttons. I’m trying to first of all configure the first button (which increases the frequency). I’m trying to also add ...
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1answer
43 views

Timer 1 Arduino - Create 2 Timers

I’m trying to output 2 separate frequencies using 2 output pins from an Arduino using the Timer 1 library. A snippet of the code is show below. void setup() { Serial.begin(9600); pinMode(button,...
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1answer
983 views

Trouble with setting the PWM frequency for Arduino Due

I'm using Arduino Due and I set the analog read and write resolution to 12-bit for better resolution. Basically all I do is to vary PWM duty cycle by controlling analog DC input voltage from 0 to 3.3V....
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1answer
478 views

ESP 32 changing frequency instead of duty cycle

Using this code on an esp32 allow to vary duty cycle of the PWM with a fixed 5000Hz frequency and is working fine. My question is how to vary frequency and keep duty cycle on a fixed value? // the ...
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1answer
118 views

Writing Data through Pin at certain frequency

I have an Arduino UNO which is connected to an KLZ25 board, the Arduino sends an 1MHz Clock at Pin 9 and now I should write the PDM-Data with 1 Mhz at pin 8. But i don't know how to write with such a ...
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1answer
161 views

6 channel PWM with 2 - 5 kHz frequency

Is it possible to set all 6 PWM frequencies to a value between 2 and 5 kHz? I've read that the base frequency for pins pins 5 and 6 is 62500 Hz. And the divisors for the pins 5 and 6 are only this ...
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1answer
62 views

Detect radio frequency keyfob [closed]

Would it be possible to detect when somebody closes/opens/uses their keyfob (based on radio frequency) ? It is of course not the intention to hack the key. Just knowing when somebody has pushed a ...
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2answers
166 views

Setting a pin to a continous wave output

Is there any way in Arduino to set a particular pin(pwm or not) to just generate a square wave out of the desired pin? For instance, I want to have two pins on my Arduino Uno that output two square ...
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0answers
394 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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1answer
175 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 ...
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100 views

Sketch works on MEGA 2560 timer2, but does not work on timer1

I set the PWM frequency on MEGA 2560 like this: TCCR2A = 0; TCCR2B = 0; TCNT2 = 0; TCCR2A = _BV(COM2A1) | _BV(COM2B1) | _BV(WGM20); ...
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2answers
290 views

Generated frequency is not as expected

This code sets a pin HIGH for 1 microsecond and then LOW for 1 microsecond. The expected frequency should be about 500 kHz. When measuring the output the frequency is about 96.4khz. Why ? int del = 1;...
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1answer
188 views

Turn infrared LED on and off in order to simulate an infrared signal

Note I am able to send and recieve IR signals. This question is only for purposes of learning. When using the existing library #include <IRremote.h> it is very simple to read and transmit ...
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1answer
129 views

Can I use arduino to generate 8mhz frequency ultrasonic pulses in piezo discs?

void setup() { pinMode(freqOutputPin, OUTPUT); Serial.begin(9600); // Set Timer 2 CTC mode with no prescaling. OC2A toggles on compare match // // WGM22:0 = 010: CTC Mode, toggle ...
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2answers
61 views

How can I calculate approximate cycles per second from pulsed pin on Arduino MKR Zero?

The relevant tech specs for a MKR Zero are: 32.768 kHz (RTC*), 48 MHz *Real-Time Clock What I'm curious about is how I might do an approximate calculation of cycles per second from operations. ...
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1answer
2k views

Changing PWM on Arduino Mega, pins 9 & 10 to 20 to 25 KHz

I'm trying to run a Nema 17 motor with a l298N motor Driver for a school project. The issue is that I am running the motor with PWM to avoid overheating of the driver, however the resulting noise at ...
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1answer
444 views

More than 4 PWM output at 25khz?

Is it possible using an arduino to control more than 4 PWM fan at 25khz ? I have found this but 4 PWM limited with an UNO https://arduino.stackovernet.com/fr/q/8407 An other arduino, like a 2560 ...
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45 views

Why does MKRZero code read value off of wire on A0, even though there is no voltage/current? [duplicate]

I have a MKR Zero running the code from the official Arduino site : https://www.arduino.cc/en/Tutorial/AnalogToMidi The circuit wasn't working (always reading a value of 0 on A0 -- as detailed in ...
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63 views

What might be some reasons this MKRZero circuit and sketch fail to read frequency?

I've built the following circuit on my MKR Zero I've also uploaded, compiled and deployed the code from the associated article (https://www.arduino.cc/en/Tutorial/AnalogToMidi) with no errors. Note: ...
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1answer
552 views

How to increase the volume in speaker using talkie library in arduino uno…?

What else should I add to this code to increase the volume..?? #include "talkie.h" Talkie voice; const int8_t speech[] PROGMEM= {0x00,0x00,0x00,0x08,0xd8,0x39,0x54,0x00,0xa7,0xa6,0x32,0xe0, 0x04,...
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1answer
3k 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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1answer
556 views

Generating Sinusoid Signal of 40khz [closed]

I would like to generate a sinusoidal signal of 40kHz using Arduino Uno. Maximum I could generate was 1kHz, using bit banging, fast PWM. Do you have ideas of how to boost it to 40kHz? I used "...
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1answer
810 views

Measuring high frequencies (300kHz) with arduino

I'm designing a frequency generator with ICL8038, which would output sine, square and triangle waves, which would reach frequency such as 300kHz. I've already designed a circuit around the ICL8038, ...
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1answer
2k views

Measuring frequency of 3-wire 12V fan on Arduino Uno

I am using a PC 12V fan (40x40mm), which I control speed with voltage (with adjustable power supply). I would like to measure the frequency of the fan with Arduino and read it on serial monitor. I've ...
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2answers
112 views

How to add prefactor to clock frequency at compile time?

I want to use an Arduino Mega at 8MHz because my power supply is bad and I have only 4.3V (no way I can fix that), which is outside the operation range of the ATMega1280 at 16MHz. I think the right ...
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1answer
64 views

Where is CLKPR located on Ubuntu 16.04 with Arduino 1.8.3

I would like to see the definition of CLKPR. I guess that similarly to PORTB and other registers, it should be defined by the toolchain? (see Where is PORTB defined? ) Am I right? Where should I look ...
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1answer
1k views

Arduino Due's clock frequency

I want to change the clock frequency of the Arduino Due. The default value of the main clock, according to the SAM micro-controller, is 4 Mhz. But I found in some forums that it is 84 Mhz. But I need ...
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1answer
62 views

Arduino Due custom platform for school and library installation

I have made a custom-development hardware for our school, where you can plug in an Arduino Due. It is mainly for driving all kind of motors and reading sensor signals. Therefore I added a custom SAM ...
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0answers
16 views

Deceleration time logger between frequencies

i need to measure the air resistance and roll resistance of a vehicle. I plan on using a toothed disc with a proximity sensor which will output a square wave signal in to an arduino. Then I will drive ...
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2answers
812 views

Can I read two PWM signals and output two square waves on an UNO?

My system requires that I read two independent PWM signals (60hz) and output two corresponding square waves. These output square waves vary in frequency according to their corresponding input duty ...
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0answers
225 views

How can I configure the RFM95 LoRa module to emit packets at only 'one' particular frequency?

I have created a LoRa gateway using a Pi3; I have used a RFM95 module for it. So, it is a single channel gateway, and I'm operating it at 868.1Mhz. But my LoRa node(also a RFM95, on an Arduino Uno), ...
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2answers
1k views

Read Audio Data in Real-time over 3.5mm Stereo Cable

My Goal Have Arduino read audio output from a TRS stereo audio cable (coming from a computer, smartphone, etc.). As motivation for this use-case, once some audio data (depending on the sample rate) ...
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4answers
654 views

Problem with the Frequency meter code

I am trying to build a frequency meter using Interrupts and Timer1, which works as if the system receives an Interrupt it would get the timer's data and would calculate Signal's Frequency = 1 / (...
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4answers
5k views

Listen for specific frequency

I’m trying to build a custom baby monitor for my wife who is deaf. It needs to detect loud noises and listen for a specific series of tones from a feeding pump our daughter uses. It will then send a ...
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2answers
226 views

Arduino-based mains frequency monitor follow-up

Following my previous question, I'm getting closer to thinking about putting together this mains frequency monitor. I would just like to do a sanity check on my electronics before I order the ...
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2answers
5k views

How do i generate exact number of PWM pulses in arduino?

So my code here generates a PWM wave of 38Khz on Port B pin 7 of arduino Mega 2560 . For that I have used a prescaler of 8 and then set the ICR1 register value to 51 . I have also set the WGM10 ,WGM11,...
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2answers
1k views

How to get 38 Khz clock from Timer 0/2 in Arduino Mega 2560?

I have been trying to generate a PWM wave of 38 Khz (13 microsec= ON period , 13 microsec= OFF period). Currently I am using Timer 0 to generate the PWM wave , however i am confused as to how to ...
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5answers
643 views

Arduino-based mains frequency monitor

I'm looking to put together a simple mains frequency monitor based on the Arduino platform. The mains here are 250 V @ 50 Hz, but obviously these fluctuate slightly, which is the whole point of the ...
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1answer
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ATmega AVR frequency measurement with timer/counter

I've been rehashing some existing libraries I found on some obscure forums to measure a frequency on digital pin 5, using the ATmega328P/ATmega2560 Timer/Counter modules and an interrupt based ...
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2answers
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Generate 1.7 Mhz with PWM in Uno?

I have this code: void setup() { pinMode(11, OUTPUT); TCCR2B = 0; TCNT2 = 0; TCCR2A = _BV(WGM21); TCCR2A |= _BV(COM2A0); OCR2A = 249; } void loop() { soundBuzzer(); } void soundBuzzer(...
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0answers
486 views

Arduino Audio Recorder - Speed Correct but Wrong Pitch

I'm working on an audio recorder project on an Adafruit Adalogger with SAMD21 ARM-based processor using the Arduino IDE. The desired sampling frequency is 10 kHz, 12-bit resolution with an analog ...
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4answers
689 views

Programming standalone Atmega328p-PU with NE555N timer IC

I know I may sound a little idiotic to ask, but as I have seen in the internet that to program a standalone Atmel chip like that from of the Arduino's, you need 2 22pF ceramic capacitors and a 16mhz ...
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1answer
2k views

Playing a pcm file through a speaker with arduino

I'm trying to play an audio file through a speaker with arduino. However, I do not want to use pre-constructed libraries such as the tmrpcm library. I was instructed to perhaps even recreate the ...
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3answers
2k views

Contoller for a stepper motor

I am currently implementing the following setup: Arduino Mega 2650 -- DRV8834 -- Stepper motor Everything works fine, however since it can provide a higher torque I want to run the stepper in half ...
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1answer
776 views

Making the speaker play a certain frequency of sound

I'm trying to make the piezo speaker play a sound of certain frequency. However, although I think the code is fine, the sound plays with a frequency between 130 ~160 only, and the frequency actually ...