OctoPrint on Ubuntu, using Python 3 and systemd

Most OctoPrint installations out there, will, most likely, run with an ready baked OctoPi image file for the Raspberry Pi. This is obviously the most straight forward approach to get OctoPrint up and running. Still, there are good reasons to run it on a regular machine. You may already run a home server or other…

4WD Steering Using a Servo Reverser (or not)

Some RC cars or model kits allow to add the steering of a second (mostly rear) axis, using a second servo. This is, for example, true for the Tamiya CR-01 or G6-01 chassis. Tamiya recommends using a remote control system and an additional channel to set this up. If you don’t already own such a…

Using High Voltage (HV) Servos on Your RC Car

Regular “low voltage” servos In most(?) or at least many cases, your steering servo is only connected to your receiver, which is powered by the inbuilt BEC of your ESC.These Battery Eliminator Circuits (BECs) are basically voltage regulators that converts your battery voltage to a voltage of about 5 to 6 Volt, although some ESC…

Multiple OctoPrint Instances using systemd

Note, that there is a newer version of this article available. This is a “work in progress”, which I have tested for a few months. It workes fine, but there could be issues not yet found. Especially when installing or removing additional Python packages. This article is based on my other article about setting up…

Pixhawk Clones – Selecting ArduPilot Copter Firmware

Backstory There are different (flight) controllers available that are named “Pixhawk”, but in this article, I want to concentrate on the mostly Chinese “clones”. Although “clone” is the wrong term here, since the whole Pixhawk platform is an open hardware project. So building and selling hardware of this design is perfectly legal (which doesn’t mean…

Simple MOSFET LED Switch for Pixhawk

The Pixhawk flight controller, using the ArduPilot Copter firmware, allows for switching one or more AUX pins as GPIO pins from low to high (or vice versa) using the provided “Relay” function. Unfortunately the STM32 MCU of the Pixhawk uses a 3.3 V logic voltage on the white/yellow signal wire, which means that most regular…

OctoPrint on Ubuntu with systemd

Note, that there is a newer version of this article available. Most OctoPrint installations out there, will, most likely, run with an ready baked OctoPi image file for the Raspberry Pi. This is obviously the most straight forward approach to get OctoPrint up and running. Still, there are good reasons to run it on a…

Sonoff S26 EEPROM Upgrade

The Sonoff S26 WiFi-Plug/Switch uses a ESP8266 micro-controller and 1 MB of memory for its firmware. It is possible to replace the default EEPROM IC with a bigger one. This comes in handy, when using Tasmota and OTA-upgrades, since the upgrade needs to be locally stored, before it can be installed. The 32 Mbit (4…

Building wooden cases for the Ruideng DPS power supplies.

The “DPS” series of power supplies from the Chinese manufacturer Ruideng is popular among hobbyists. It allows to set voltage and current, but still needs a source power supply – so basically it’s a DC buck converter. It also doesn’t come with a case. I built three cases, using some scraps of plywood. Two cases…

1000 oder 1024: (SI-)Präfixe für die Einheit Byte

Warum ist das eigentlich nicht so einfach wie bei Gramm und Kilogramm? Früher oder später wird man mit der Tatsache konfrontiert, dass es bei der Angabe von Bytes nicht so einfach zugeht, wie bei anderen Maßeinheiten. Insbesondere bei großen Datenträgern wundert sich der eine oder andere, warum die Angaben des Betriebssystem auf den ersten Blick…