A short while ago I ordered some stuff from China. The site offered free delivery via DHL. Cool! I was later contacted by the seller to say that I lived in a ‘remote area’ – the DHL delivery cost would be double. What. The. Heck? I live within the municipal boundaries of a mainland city… Read More »
Let’s start with the disclaimer. What follows is a Bad Idea, you could get blinded, burned, electrocuted or have your house burn down. This is not an exhaustive list. Really, I can’t recommend you try this yourself. The upside is a potential big saving in rechargeable batteries that you’d normally toss in the recycling.
I’m building a cluster using Raspberry Pi derivative boards (Banana Pi). Jeff Geerling gave me the idea to make a little PCB with RGB LED and also a 5.5mm DC barrel-style power connector.
Here are a few notes on working with the uber-cheap ESP-01 WiFi microcontroller module with Ubuntu.
This gadget steps up the game from leaving a light on at home when you’re out. Place it near a window to make it look like somebody’s at home watching TV.
For fun I made a dedicated geocache toy from an Arduino, GPS receiver and electronic compass modules and neopixels (RGB LEDs).
DigiSpark is one of the cutest Arduino-related widgets around. It’s about the size of a postage stamp, plugs straight into your USB port and will probably cover most of your microcontroller project needs. The problem is that it doesn’t seem to play nice, out-of-the-box with 64-bit Ubuntu Linux.
This is just a quick note to help those who might have trouble interpreting the instructions from Rigol for their awesome DP832 Programmable Power Supply Unit in order to get a ramp voltage.
I bought a €40 “Anbere” brand IP camera from eBay to find that it can only be used to feed the supplied Microsoft Windows application. I need it to perform the simple task of serving a JPG through its web interface. This left me with two options: bin it or reverse engineer this shonky POS.… Read More »
10 years ago I bought a radio for my workshop. The criteria were: FM, cheap and mains-powered. I forgot to add the criterion: works. The radio was really bad at tuning – be that finding a station or keeping tuned to it. So I decided to gut it and put my own circuit inside.
In building QRP HF radios, having an RF signal level amplifier building block is handy. You want 50 Ohm output impedance, some reasonable gain, supply voltage of the usual 10-14V and ease of building using standard parts from your parts bin. Some searching around the interwebs came up with a good idea for circuit from… Read More »
I don’t do Microsoft Windows. Android and Linux are My Things. I subscribe to ARRL to get the digital version of their excellent QST magazine. Unfortunately, their support for offline reading in Linux is zero and their Android app is so poor as to be unusable. So I want to download QST in PDF so… Read More »