Systemd unit for managing USB gadgets

Fri 19 October 2018 by Lars Kellogg-Stedman Tags raspberrypi usb

The Pi Zero (and Zero W) have support for acting as a USB gadget: that means that they can be configured to act as a USB device -- like a serial port, an ethernet interface, a mass storage device, etc.

There are two different ways of configuring this support. The first …

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Configuring a static address for wlan0 on Raspbian Stretch

Thu 14 June 2018 by Lars Kellogg-Stedman Tags networking raspberrypi

Recent releases of Raspbian have adopted the use of dhcpcd to manage both dynamic and static interface configuration. If you would prefer to use the traditional /etc/network/interfaces mechanism instead, follow these steps.

  1. First, disable dhcpcd and wpa_supplicant.

    systemctl disable --now dhdpcd wpa_supplicant
  2. You will need a wpa_supplicant configuration …

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Using a TM1637 LED module with CircuitPython

CircuitPython is "an education friendly open source derivative of MicroPython". MicroPython is a port of Python to microcontroller environments; it can run on boards with very few resources such as the ESP8266. I've recently started experimenting with CircuitPython on a Wemos D1 mini, which is a small form-factor ESP8266 board …

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Multiple 1-Wire Buses on the Raspberry Pi

Tue 27 March 2018 by Lars Kellogg-Stedman Tags hardware raspiberrypi iot

The DS18B20 is a popular temperature sensor that uses the 1-Wire protocol for communication. Recent versions of the Linux kernel include a kernel driver for this protocol, making it relatively convenient to connect one or more of these devices to a Raspberry Pi or similar device. 1-Wire devices can be …

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Using Docker macvlan networks

Mon 12 March 2018 by Lars Kellogg-Stedman Tags networking docker

A question that crops up regularly on #docker is "How do I attach a container directly to my local network?" One possible answer to that question is the macvlan network type, which lets you create "clones" of a physical interface on your host and use that to attach containers directly …

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