Raspberry pi tone generator

congratulate, very good idea suggest..

Raspberry pi tone generator

In this project you will program a short tune. It could be used as a doorbell chime, a mobile phone ringtone, an alert notification on your computer or included in a web page. If you need to print this project, please use the Printer friendly version.

In this project, children will program a doorbell chime to learn how to play musical notes using numbers and use repetition to repeat notes. This project covers elements from the following strands of the Raspberry Pi Digital Making Curriculum :.

Generating random and pre-recorded Morse code

Save your progress! Sign in to or create a Raspberry Pi account to save your project progress and come back later. Introduction In this project you will program a short tune. Click the play button below to hear how the doorbell chime will sound: Your browser does not support the audio element.

Club leader notes Introduction: In this project, children will program a doorbell chime to learn how to play musical notes using numbers and use repetition to repeat notes.

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Frequently Asked Questions The numbers used are midi numbers, numbers 21 to correspond to the notes on the piano. On the Raspberry Pi you can use aplay from the command line to play. Project materials Club leader resources Downloadable completed Sonic Pi project Downloadable completed project mp3 file.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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I want to play a tone, generated on the fly, every time a button in the GUI is pressed.

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Here's the code:. I searched for few hours now and I tried solutions using subprocesswhich give back the same problem, and solutions related to playing files, while I need to generate tones on the spot because in the future they will be randomly generated. My question boils down to: 1 why the command that works in the terminal does not work within the python script 2 how do I make it work so that I can generate tones directly from the script?

I read somewhere I can't find anymore that one might need to specify the audio driver during the call from the script. But I wouldn't know how. Learn more. Raspberry pi: generate and play tone from python code with sox Ask Question. Asked 2 years, 2 months ago. Active 2 years, 2 months ago. Viewed 2k times. Active Oldest Votes. Found the solution. I needed to specify the sound card to use and I did so by changing the line os. Sign up or log in Sign up using Google.

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My code controlling GPIO output is based on this article.

Compose your own tune

When I run my code, it shows the square wave with the period of 4. It's not a tolerable error since the order of hundreds Hz and MHz. I've googled for this problem and found that usleepnanosleep cannot work properly if the sleep time is too short since some kind of linux system scheduling.

But I have no idea to solve this problem. Some suggest to use delay instead of sleep but I'm not sure it will work or not. My pigpio library will let you generate repeating waveforms with a resolution of microseconds. If you need less than microseconds you'll need to find another solution.

What you are trying to do is impossible using Linux, because it is not a realtime OS. This is not just a problem with the delay routines. Try your code, omitting the usleep calls, which might give you some idea what the maximum frequency might be, but even here you will find quite long and unpredictable delays due to interrupt handling. It is not impossible to set the Pi hardware to generate a square wave, but this requires a totally different approach.

It will not be accurate, because of which you'll NOT get a steady tune, instead the tune will fluctuate in frequency. If you try to do same in microcontroller e. You can use this snippet to get a beep by adjusting the timing parameters. But you cannot make beautiful melodies :. Sign up to join this community.The Raspberry Pi in use as RF generator.

But it was not very difficult to make a simple GUI in Python.

raspberry pi tone generator

You can press buttons with the mouse and the program makes the correct "command lines" and sends it to the nice program of Jan Panteltje. This program was also modified a bit, so that you can make an FM or AM modulated burst of 20 seconds.

Installation Create a new directory and copy the files in the following ZIP file to that directory: 17raspigensource. You will see this file appear in the directory. The Graphical User Interface that makes it easier to give the commands. StartSweep Starts the sweep. After 20 seconds, the signal stops and you have to press the button again.

Measurements of the audio characteristics of receivers Connect the audio output of the receiver with the soundcard of a PC with an audio spectrum analyser program.

Cyclone II Raspberry Pi RS232 FTDI Waveform Generator/Frequency Analyzer

For example: 11sa. Frequency step: 10 Hz Time step: ms Set the trace of the audio spectrum program to Max Hold and start the sweep, the trace will be drawn on the screen as shown below.

If you want to compare two measurements, save the first measurement into the trace memory. Below you can see the wide bandwidth green colored. The orange colored narrow bandwidth has been measured first and is stored in the trace memory. When measuring the unwanted low sideband, the stop frequency is set to zero beat with the receiver 0 Hz audio tone and the start frequency equal to the stop frequency minus the audio range you want to measure.

The desired sideband is the orange trace, the unwanted one is the green trace. The sideband suppression is the difference between both traces. The peak of the desired orange sideband and the unwanted green sideband dip should lie at the position of the red arrow.

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Could be better! Bandwidth of the QRSS receiver Sideband suppression of the QRSS receiver Adjustment of the AM suppression of a direct conversion receiver From the 30 meter QRP transceiver, the ohm potentiometer in the receiving section has to be adjusted to maximum suppression of the detection of strong AM signals in the nearby broadcast band.

The RF generator is AM modulated and tuned to a frequency in the middle of this band. The level is adjusted positioning and adjusting the length of the antenna that a clear signal is heard. Then the potentiometer is adjusted so that this signal is minimally audible. The ohm potentiometer of the direct conversion receiver has to be adjusted to maximum AM suppression.We look at two ways to generate Morse code, then use the code to open and close a telegraph sounder.

My first exposure to Morse code [1] was 15 years ago at an amusement park. I stumbled into a small exhibit, complete with a ticket agent mannequin that, despite his rather stiff appearance, was managing to send Morse code on an authentic telegraph key and sounder. That exhibit always stuck in the back of my mind, and in the years since, I've had the opportunity to recreate it a few times.

Although the Texas Electric Railway never used telegraph equipment for communication, the museum had a small display about it. I thought it'd be great for someone to be able to "talk back" to the telegraph exhibit, so I started figuring out how to do that, with little more than a desired outcome and no idea of the path to take. The development platform available to me at the time was an Atari XL [2]so using my newly learned skills in BASIC, I wrote a program to translate characters to their equivalent dots and dashes.

Next, I dug into the Atari's programming manual and found the codes that control the audio cassette tape recorder, which was used as the storage medium, as well as an audio output. I had the official Atari-branded model that plugged into the peripheral bus, so I didn't have to use an external audio cable. By sending control commands to the tape directly, I was able to record my Morse code messages as data "marks" and omit the "spaces.

Data on the Atari tape was either a "mark," a tone at 5,Hz representing a binary 1, or a "space," a tone at 3,Hz representing a binary 0. In a normal setting, this data was recorded on the tape at the blazing rate of baud. To make the Morse code tape, I told the tape recorder to generate marks only and started and stopped the generator with timing from my original program. The tape that came out of the Atari that Saturday afternoon sounded just like the code tapes I listened to so often when studying to pass my ham radio Morse code test.

Now the challenge was to convert the tone into a form that could open and close a telegraph sounder.

raspberry pi tone generator

Enter the LM The LM [3] is a quad comparator integrated circuit. Each comparator has a positive and a negative input, but this is somewhat deceptive, in that both inputs expect positive voltage. When the positive input is receiving a higher voltage than the negative input, the output of the comparator connects to ground. Otherwise, the output is open.

A signal transistor controlled by the comparator switches the actual load, a small signal relay.

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This in and of itself produces a nice clicking sound very similar to a telegraph sounder. Looking back, the transistor was probably enough to switch the telegraph sounder directly, but I wasn't sure, and I certainly understood the switches of a set of relay contacts.

I also reasoned that the telegraph could then have its own power source, while my circuit remained independent. To get the telegraph to operate, you just had to play the tape! The circuit decoded the tones and clicked the relay, which in turn clicked the sounder in the display.I searched through internet how to command the speed of a fan by a gpio port. Now, I have to adapt your code, calculate how much i have to get for my capacitor sand my pi will run cooler than ever!

My theoric thinking: 1rst step: I create a schematic that allows me to output a gpio port in a transistor, to command the fan. A period isn't alway symetric. Look for "duty cycle" in square signals, you will find about what i'm talking about. Thank you very much for this. A fantastic article that was well wriiten, easy to ready and informative to boot. Added bonus: code worked flawlessly the first time and I got this up and running in no time at all. Thank you! Thank u and waiting your reply, El Amin.

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As the errors tells you - out of range I'm looking for a cheap, MHz frequency generator for a physics experiment. Am I reading it right that the Pi is only capable of MHz? Or am I misunderstanding? If the Pi can't do it, would you have any suggestions? I don't require communications-grade precision, a bit of frequency drift shouldn't hurt anything as long as it's manually correctable.

Sunday, January 26, Raspberry pi as a simple low cost rf signal generator [quick and dirty solutions]. Rspberry Pi RF Signal generator A simple radio frequency signal generator is very useful for testing components, filters, receivers and other test systems in a wide range of applications. After the famous pifm project, which can generate an fm signal from the GPIO pins of raspberry pi, i cam across the following code which convert pi in to a simple portable signal generator.

It works by using the hardware on the raspberry pi that is actually meant to generate spread-spectrum clock signals on the GPIO pins.

raspberry pi tone generator

It should be kept in mind that the signal is a square wave with strong odd harmonics.The program can run in parallel with other applications on a single Raspberry Pi for instance, on an RPi running the Allstar repeater control application or can be installed stand-alone on inexpensive hardware like the Pi Zero. PiTone can generate a continuous tone or a tone output synchronized with an external input signal — typically a detected CTCSS tone at the input of a repeater.

In the synchronized mode, the turn-off of the output can be delayed by a specified amount. PiTone can be used with the Raspian operating system as well as other RPi operating systems.

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PiTone will run on any version of the Raspberry Pi. However, to avoid occasional distorted cycles of the tone output, the faster Raspberry Pi 3 or 4 is recommended. More information about this system is available at www. The first four following figures show the output waveforms from PiTone at The last two figures show Histograms of the output frequency for 32 and steps.

Depending on the point where the tone is injected and the circuitry of the transmitter, additional low pass filtering may not be required. PiTone will run on a Pi Zero, 2, 3 or 4. This is due to a WiringPi library bug in which the internal pull-up cannot be activated by WiringPi. Complete information on this system is available from www.


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