How to build your Energy Load manager

A detailed instructions of how to build an Energy Load manager from Open Electronics: When the instantaneous power consumption exceeds the set values, it selectively disconnects the users, in order to prevent the electric meter to cut the power to disconnect. The management of the electricity users at home, intended as the possibility to define […]

Build a Multisensor Shield for ESP8266

Rui Santos has a great write-up on building a Multisensor Shield for ESP8266, that is available on GitHub: In this project you’ll discover how to design and create a Multisensor Shield for the ESP8266 Wemos D1 Mini board. The shield has temperature sensor (DS18B20), a PIR motion sensor, an LDR, and a terminal to connect […]

3D printed stirling engine gas burner and flywheel

The 3D printed Stirling Engine with its new gas burner and heavier flywheel from Do It Yourself Gadgets: Take a look at my upgraded Stirling Engine with its new gas burner and flywheel! If you take a look at my previous post you’ll see how I built a 3D printed holder for my Stirling Engine […]

A software only solution to the vexing Beagle Bone Black PHY issue

Josh Levine has a nice write-up about a software only workaround for the Beagle Bone Black PHY issue: Sometimes the Ethernet port on a Beagle Bone Black does not work on power up. It takes either a physical reset button press or a power cycle to fix it. This problem affects all BBB’s and until […]

Tutorial: Setting up a low cost QRP (FT8, JT9, WSPR etc) monitoring station with an RTL-SDR v3 and Raspberry pi 3

A detailed tutorial on how to set up a cheap QRP monitoring station using an RTL-SDR V3 and a Raspberry Pi 3 from rtl-sdr.com This tutorial is inspired by dg0opk’s videos and blog post on monitoring QRP with single board computers. We’ll show you how to set up a super cheap QRP monitoring station using an […]

Arduino time attendance system with RFID

A how-to on building a time attendance system with MFRC522 RFID Reader and Arduino from Random Nerd Tutorials: Before getting started it’s important to layout the project main features: *It contains an RFID reader that reads RFID tags; *Our setup has a real time clock module to keep track of time; *When the RFID reader reads an […]

Why electrolytic capacitors are actually kinda shitty

Afroman writes, “Electrolytic capacitors are common, but knowledge of their limitations is uncommon. A demonstration is shown highlighting the difference in performance between electrolytic and ceramic capacitors in power supplies. Other topics discussed in the video: Electrolytic capacitor construction, ceramic capacitors, ESR, ESL, impedance curves, why “0.1uF”, and more.” Via Afrotechmods. Check out the video after […]

DIY through hole plating of PCBs

Jan Mrázek documented his experience experimenting with DIY through-hole plating of PCBs: I’ve been thinking about though hole plating for several years. The general procedure is simple – you have to activate non-copper surfaces (make them conductive) and then you apply standard electroplating procedure. You can find many tutorials on the internet, however, most of […]

Extend Eagle CAD tool with ULPs: Writing your first User language program

Yahya Tawil posted a detailed how-to on writing ULP’s for Eagle CAD: In this tutorial, you will learn how to write your first ULP in Eagle CAD to add a new capability to your CAD tool. User Language Program (ULP) is a set of extensions for Eagle CAD users to either facilitate a routine job […]

Panelization – using GerberPanelizer on Windows (Linux possible)

Arsenijs over at Hackaday.io writes: This tutorial was done on Windows. Authors claim it could also be used on Linux by using Mono, but I haven’t tried and don’t understand a lot about Mono to see what could be done. I am switching to Linux nowadays, so I’d be very grateful to anybody that’d make instructions […]