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Now you can play any audio with a tiny device and a USB battery pack. The Speaker pHAT is a Raspberry Pi Zero-sized HAT that not only adds audio capability to the smallest of the Raspberry Pi family, but also sports a 3 W speaker. Luckily, the clever people at Pimoroni have you covered. After all, your cool wearable project is going to be problematic if you’re trailing an amplifier on a cart with a 50-metre extension lead powering everything. If space is an issue, a Raspberry Pi 4, amplifier, and speaker may not be what you have in mind. The first parameter sets the sound to be a voice, and the -c tests stereo channels only: front left and front right. It’s as simple as this: speaker-test -t wav -c 2 This can produce white noise or vocal confirmation so you can check your speakers are working properly. OMXPlayer is a great choice for Raspbian, but other players such as mpg321 are available, so find the tool that’s best for you.Īnother useful utility is speaker-test. Here, -no-keys removes the interface, and the ampersand (&) tells the operating system to run the job ‘in the background’ so that it won’t block anything else you want to do. If you’d just like it to run in the background without user input, run the command like this: omxplayer -no-keys example.wav & You’ll notice that when it’s running, OMXPlayer provides a user interface of sorts, allowing you to control playback from within the terminal. Want the audio to loop forever? Just add -loop to the command. There are many command-line options that allow you to control how the audio is played. It sends audio to the analogue audio jack by default, so playing back an MP3 file is as simple as running: omxplayer /path/to/audio/file.wav
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This is a dedicated hardware-accelerated command-line tool that takes full advantage of Raspberry Pi’s capabilities. The simplest way to play audio on Raspbian is to use OMXPlayer. As they are low-power, USB devices do not tend to feature amplification, unless they have a separate power source.
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Unsurprisingly, when choosing your USB sound device, you can start at a few pounds and go right up to professional equipment costing hundreds. Many DACs also come with on-board amplifiers. To fix this, run alsamixer from the command line, press F6 to select the new sound device, and if you see ‘MM’ at the bottom of the volume indicator, press M to unmute and adjust the volume with the cursor keys. You may need to select the new output, as the underlying audio system, ALSA (see the ALSA and PulseAudio section for more), may mute it by default.
Installation tends to be no more complicated than plugging the device into the USB port. Literally hundreds are available, and a basic input/output device with better audio quality than the on-board system can be purchased for a few pounds online. Plug and playbackĪ USB sound device is another simple choice for audio playback on Raspberry Pi. You may need to reboot Raspbian for all changes to take effect. When the menu appears, go to Advanced Options and select Audio, then select the option to force the output through the audio jack. To fix this, open up a terminal window and run sudo raspi-config. an HDMI TV), sound will not come out of the correct device. Sometimes, especially if you’ve connected an HDMI monitor with sound capability (e.g. Normally, the Raspbian operating system will recognise that an audio device has been connected and route audio through it. Need a simple solution? USB audio devices come in all shapes and sizes but are mostly plug-and-play
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This is the most direct way of adding sound to your project, but how to get the sound out? Of course, add an amplifier or active speaker and you have sound as loud as you like. This provides your cheapest route to getting audio from your Raspberry Pi computer.Ī low-cost passive speaker can be directly plugged in to provide sound, albeit probably quieter than you’d like. The original Raspberry Pi featured a stereo 3.5mm socket, and all A and B models since feature a four-pole socket that also includes composite video. Raspberry Pi computers, with the exception of the Zero range, all have audio output on board.
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See if you can make Morse code sounds by changing the duration of the sleep statement. Run it at the command line: python3 buzz.py
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Now, install the GPIO Zero Python library by typing this at the command line: sudo apt install python3-gpiozeroĬreate a file called buzz.py in your favourite editor and enter the following: import time Try connecting a buzzer’s red wire (positive) to GPIO pin 22 (Broadcom numbering) and the black wire (ground) to any GND pin. A cheap active buzzer can be quickly added to Raspberry Pi’s GPIO. The simplest place to start is with the humble buzzer. Need to keep it simple and under a pound?
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