WiFi plug with Tasmota – Delock 11827

With the Fritz!Box 7390 I have already used a number of switching plugs from AVM, specifically the Fritz!DECT 200 and later also the Fritz!DECT 210. In addition to the switching function, these devices also offer measuring power consumption and temperature and can also be switched by sound if desired, e.g. when you clap your hands. However, this also has its price: currently you can get these devices, if at all, for no less than 60-70 EUR. In the past, you had to budget at least EUR 50 for it.

Delock 11827 WiFi plugBut since I’ve been using Home Assistant, there are also alternatives.

The Delock 11827 is a device with energy measurement in which Tasmota is already pre-installed. An ESP8266 with 1 MB memory is used as the controller.

With a sales price of around EUR 20, the device is also significantly cheaper than the solution from AVM. However, there is no temperature measurement or noise detection. On the other hand Tasmota offers a very extensive programming option with timers and you can also correct the measured values via console commands if necessary and change the switching function of the relay to permanently “on” if you want to use the devices for energy measurement only. An HTTP API to control the device is also available.

Continue reading

Pinecil V2

Disclaimer: the experiences described here are my personal opinion. I bought the product privately and paid for it myself.

So far I have used “traditional” soldering stations consisting of a base for power supply and temperature control and a handle with heating and replaceable soldering tips, like the Hakko FX-888D.

The crucial thing is the way the soldering tips are heated: the heating element is part of the handle and the soldering tips are only made of metal and are heated by the heating element. As a result, it takes a relatively long time for the soldering tip to reach the temperature of 350 °C required for lead-free solder after switching on. With the Hakko FX-888D this takes about 30-40 seconds. Since the temperature is also not measured directly in the soldering tip itself, the control can react to changes only with a delay.

Due to the long heating-up time, devices of this type also lack an automatic “sleep mode” to reduce heating power if the soldering iron is not used for a few minutes. This can lead to residues on the soldering tip oxidizing heavily and the soldering tip then having to be laboriously cleaned so that it accepts solder again.

Continue reading

LED display HDSP-2000

The designation “HDSP-2000” refers to different variants of LED matrix displays that were developed by Hewlett Hackard and later also offered in a variant by Siemens. What they all have in common is that they display four characters with a matrix of 5×7 characters each with a height of 3.7 mm and use a DIL-12 housing. Multiple displays can also be placed side by side to form longer lines of text.

HDSP 2000, variants with ceramic carrier

The first displays with red LEDs were used in devices such as the HP 9825A in 1976. Later there were also other variants with yellow and green LEDs. A special feature is the elaborate construction with ceramic carrier and glass cover, which was colored in the red version to achieve a higher contrast.

Continue reading

Hantek DSO2D15 digital storage oscilloscope

In the summer of 2021 I bought a digital storage oscilloscope (DSO) for my electronics workshop – a Hantek DSO2D15. This model is from the DSO2000 series and offers two channels with 150 MHz and an integrated signal generator with up to 25 MHz. There are also variants with 100 MHz (DSO2D10) and without a signal generator (DSO2C10 and DSO2C15). Now that I’ve been using it for over a year, it’s time for a review.

Continue reading

Better code blocks with EnlighterJS

In many posts I show examples of source code. Previously, these examples were only included in simple <pre> blocks. I’ve been looking for a better solution for a long time that should meet the following requirements:

  • Use of <pre> is still possible so that I don’t have to laboriously rebuild existing articles.
  • Line numbers and syntax highlighting for all required languages and formats.
  • Easy way to copy the texts with one click.

Continue reading

Nextcloud Office

In the meantime I have been using Nextcloud on my own servers for several years and also an Office integration in order to be able to edit documents together with others directly in the browser. Originally, I chose OnlyOffice because it was much more mature than Collabora in 2018.

Continue reading

TESmart KVM-Switch HKS0401B2U-EUBK (4× HDMI 4K @60Hz)

Disclaimer: the experiences described here are my personal opinion. I bought the product privately directly from the manufacturer and paid for it myself.

In the meantime, I often have the situation of having to switch between different computers, e.g. laptop and PC or PC and Raspberry Pi. Monitors usually offer several inputs, so switching here is usually not a problem. However, there is still the problem of having to move the keyboard and mouse around as well, which can be very cumbersome in the case of stationary PCs under the desk.

KVM switch TESmart HKS0401B2U-EUBK

The solution: a KVM switch. KVM stands for “Keyboard Video Mouse”. Such a switch is connected to a monitor, keyboard and mouse and forwards the connection to one of several connected computers. I chose a model from TESmart, which allows it to be mounted on a wall or under the desk. Furthermore, it also offers practical functions such as “USB passthrough”, which are often missing in simpler models. There are also models that are intended as a desktop device, but otherwise work in the same way.

Continue reading