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…

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…

STM32 T12-Lötstation

Wie bereits im einführenden Artikel beschrieben, handelt es sich bei dieser recht kompakten Lötstation, um eines von zwei verbreiteten Modellen. Dieses hier arbeitet mit einem STM32 Microcontroller und hat etwas mehr Funktionen als das Modell mit STC Microcontroller. Insbesondere besitzt sie ein aufwändigeres Display welches mehr Informationen liefert. Weiterhin kann man verschiedene Lötspitzen kalibrieren und…

STC T12-Lötstation

Wie bereits im einführenden Artikel beschrieben, handelt es sich bei dieser recht kompakten Lötstation um eine von zwei verbreiteteren Modellen. Dieses hier arbeitet mit einem STC Microcontroller und hat etwas weniger Funktionen als das Modell mit STM32 Microcontroller. Dies kann aber ggf. auch ein Vorteil sein.

Calculate LED current limiting resistor

To power an LED, the current that flows through it needs to be limited. For simple LEDs like the ones for signalling purposes, the cheapest and easiest way is to use a resistor in series with the LED, to limit the current. The question that normally remains is: Which value should the resistor have?

T12-Lötstationen aus China

T12-Lötspitzen? Seite einigen Monaten finden sich bei den bekannten chinesischen Online-Handelsplattformen Lötstationen verschiedener Bauart unter dem Stichwort “T12”. Was hat es damit auf sich?

Fan-controller for the APS 3005D bench power supply

Like for the Lavolta power supply, I wanted to build a simple fan-controller circuit. Actually, I built this one first, and unlike the other one, which used the ATtiny85, I decided to build this one with a ATtiny13a. Because of this, the library for the DS18b20 digital sensor was too big to fit into the…

Fan-controller for the Lavolta BPS305 bench power supply

The Lavolta BPS305 is a cheap bench power supply of Chinese origin. The device comes with a 24 V DC fan, but without any means to control it in any way. The fan will just run the whole time, which is pretty annoying. Because of that, I decided very build a fan-controller using a microcontroller…