Author Archives: peterneufeld

LD2410 Human presence radar sensor

The reliable detection of human presence is not easy to achieve. But there is an interesting very small sensor HLK-LD2410(B) for this purpose

SDR with HackRF + Opera Cake + OpenWebRX + RasPi4

The open source SDR device HackRF One , developed and produced at Great Scott Gadgets,is a great and universal lab device as a receiver or transmitter between 1 MHz and 6 GHz. However, confronting the dynamic range of the 8bit AD converters with the extreme signal levels at a real receiving antenna site can quickly […]

The Gladly Touchable Electric Wire

My dear wife asked me to provide the kitchen spots with a “non-Alexa” switch in order to be able to turn on the lights even with floury or sticky fingers.

ESP32 Range Extender / Antenna Modification

When experimenting with ESP32 modules, especially the ESP32 CAMs, I wish I had a little more WIFI range reserve.This could be achieved by adding an external antenna – but only a few modules are prepared for the connection of an external antenna. The resulting financial and mechanical outlay is also no longer negligible and may […]


There is not always a necessity for highly accurate and expensive measuring devices to determine indoor air quality. A rough reading and limit monitoring can also be very helpful if you simply want to know when it is appropriate to ventilate an intensively used room. Such a device becomes even more useful when its simple […]

Magnetic Levitation – The VERY Easy Way

A very simple analog circuit for levitating small objects, which is the essence of many enlightening technical discussions and the result of experiments with some analog or digital prototypes. The analog electronics now even fit in the housing of a modified “Finder”-relay! I wrote <here> and at Elektor Labs about my experiments with my magnetic […]

ESP32-Servo-CAM with ANNEX32

A bit of ANNEX32-BASIC-code to control an ESP32 based pan/tilt servo CAM. No ARDUINO-Code, no compiling … just run the interpreter on the ESP32-device and develop, change customize your BASIC-script with your browser in the web interface of the device. My intention for the hardware and software was: “Keep it simple”. So I stacked two […]

Magnetic Levitation – Digitally Reloaded

In the two articles “Magnetic Levitation – The Easy Way” and “Magnetic Levitation – The digital Way” I described how to build a circuit that can keep a small object well in levitation. Only readily available components should be needed for both set-ups and the electromagnet should be as simple as possible to produce. ############# […]

ESP8266 Hour Glas

I created this project some time ago as an example for newbies to ANNEX RDS, a BASIC-interpreter that runs in an ESP8266 or ESP32 . A clock – both analogue and digital …  … consisting of – ESP8266-Wemos-D1-Mini, – TM1637 4digit 7-segment display – SG90 mini-servo and some cheap peripheral components like – a LDR […]

ESP32 Airplane Banner

If someone thinks I like clocks of all kinds … he might be right A project with a dot matrix clock of CiccioCB, the author of ANNEX32, an ESP32 BASIC-Interpreter,  inspired me a little.So I went back to my late childhood, spent a couple of hours gluing a model airplane together … added some soldering […]