Category Archives: Shell Script

Raspberry Pi as a Hotspot/Access Point using ‘DHCP’

Raspberry Pi as Wireless Access Point

The Raspberry Pi can be used as a wireless access point, running a standalone network. This can be done using the inbuilt wireless features of the Raspberry Pi and even the Raspberry Pi ‘Zero W’, or by using a suitable USB wireless dongle that supports access points.

Note that this documentation was tested on a Raspberry Pi 3, and it is possible that some USB dongles may need slight changes to their settings. If you are having trouble with a USB wireless dongle, please check the forums.

In order to work as an access point, the Raspberry Pi will need to have access point software installed, along with DHCP server software to provide connecting devices with a network address. Ensure that your Raspberry Pi is using an up-to-date version of Raspbian is “Stretch“, or better (e.g. 2018-06-27-raspbian-stretch-lite.img).

Writing Your First Shell Script with Raspberry Pi

First Bash Script with Raspberry Pi

In this tutorial we’ll be writing our first bash script for Raspberry Pi. We’ll create a directory to keep this and future scripts, write the actual script, and set it up as something that can be executed from the shell.

Scripts are an incredibly powerful tool to have in your toolbox. In essence, a script is just a sequence of commands that you could otherwise have entered into the shell. The power of scripts is that they can be used to make decisions, and execute certain commands based off that decision. Scripts can be scheduled to run at certain times, and can execute trigger other scripts.

In this tutorial we’re assuming you’re familiar with how to use the terminal to navigate the file system and create files and directories.

24-bit, 192KHz Audio for the Raspberry Pi Zero with the pHAT

pHAT DAC for Raspberry Pi Zero

The pHAT provides a super affordable high-quality DAC for your Raspberry Pi. It pumps out 24-bits at 192KHz from the Raspberry Pi’s I2S interface on its 2×20 pin GPIO header.

Use pHAT DAC to build a tiny, lush-sounding streaming music device, or use it with Scroll pHAT to make a beautiful spectrum analyser!

Features

  • 24-bit audio at 192KHz
  • Line out stereo jack
  • Optional landing for dual RCA phono connector
  • PCM5102A DAC over the Raspberry Pi’s I2S interface
  • pHAT DAC pinout
  • Compatible with Raspberry Pi 3B+, 3, 2, B+, A+, Zero, and Zero W
  • Female header requires soldering



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