Author: max

Enabling Equalizer on Handsfree Sending Audio with ALSA equal plugin

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This post shows steps to enable equalizer on Bluetooth handsfree (HFP) sending audio by using ALSA equal plugin.   Contents – Prerequisites – Steps 1. Equalizer Plugin Installation 2. ALSA Configuration 3. PulseAudio Configuration 4. Connect your phone and make a call 5. Adjust equalizer – Reference   Prerequisites Bluetooth Handsfree profile needs to be… Continue reading “Enabling Equalizer on Handsfree Sending Audio with ALSA equal plugin” →

Accessing SD Card from Linux VirtualBox Guest on Windows Host

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This post shows steps to enable SD card access from Linux VirtualBox guest on Windows host. In this post, I use Windows 10 as the host and Ubuntu 18.04 as the guest.   Steps 1. Check Device ID for SD Card 1-1. Open Command Prompt (or Windows PowerShell) as administrator (e.g. “Windows” key + “x”… Continue reading “Accessing SD Card from Linux VirtualBox Guest on Windows Host” →

Using Your Phone as Touch Screen Display for Raspberry Pi

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Got a Raspberry Pi but don’t have a display, keyboard, or mouse? You can go with headless setup, or use your phone as a touch screen display (with onscreen keyboard). This post shows steps to connect Raspberry Pi with your phone wirelessly and use it as a touch screen display by using Remote Desktop Protocol [1]. Here is… Continue reading “Using Your Phone as Touch Screen Display for Raspberry Pi” →

Mapping Caps-Lock Key to Control Key

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I used to use Happy Hacking Keyboard. Its control key is located where usual keyboard has caps-lock key. (see below picture). So, for me it’s natural that control key is there, below the tab key and above the shift key. This post shows steps to reassign the caps-lock key to control key on ordinary keyboard,… Continue reading “Mapping Caps-Lock Key to Control Key” →

Creating AltBeacon with Raspberry Pi using BlueZ Example Code

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Update (Jul 9, 2019): Step 1 is no longer required since Raspbian Buster (2019-06-20). Please check the updated steps in here.   A previous post showed the steps to make an iBeacon transmitter with Raspberry Pi using BlueZ example code (i.e. “example-advertisement“). This post shows the steps for AltBeacon [1] in the same manner.   Here are… Continue reading “Creating AltBeacon with Raspberry Pi using BlueZ Example Code” →