Blog Archives

Logic Friday

Today I wanted to quickly calculate a truth table for a simple boolean equation. Whilst this can be done very simply on paper it becomes tedious with lots of inputs. A quick Google search found "Logic Friday", available at

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New PCBs

Today two sets of PCBs arrived from OSH Park. Firstly a breakout board for Kingbright 14 segment LEDs. These are great for very high brightness text display. Secondly a small breakout board for the Maestro A2035-H GPS receiver. This is

Posted in Electronics

dogm ST7565 display modules

I wrote previously that I would review a graphic LCD made by dogm, which was provided by the company so I could update my ST7565 library. These can be bought from Mouser for reasonable prices. There are a variety of

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Measuring PIC Vdd with no external components using the FVR

I have written a simple tutorial explaining how to use the PIC fixed voltage reference (FVR) in order to calculate Vdd, using no external components. It got a bit long for a blog post so can be found here: Measuring

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Video 1 - Hand SMD assembly and frying pan reflow

People often ask how I assemble SMD boards, the video below is sped up to 20x and demonstrates the process. It takes a few minutes to dab some solder paste on each pad, then parts are placed using anti-magnetic tweezers.

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Morse code spooks

After some recent discussions with two friends Rich & Dave I have been playing with WebSDR, decoding all sorts of transmissions using MultiPSK. I have never been particularly interested in amateur or "ham" radio but receiving and decoding signals from

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Neat prototyping boards

Today I received some prototyping boards from Mike at White Wing Logic.  These are a little like stripboard/veroboard on steroids, they have footprints for a number of different surface mount parts and connectors with breakout pads.  I have used breadboard

Posted in Electronics

Updated ST7565 library

I have made a few changes to my ST7565 library, available from github. Firstly the configuration is now broken out into a new file, so that st7565.h and st7565.c can be overwritten when the library updates without interfering with port

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Generating a simple sine wave

I needed a sine wave carrier for a magnetic transponder system I am working on. Various types of crystal based oscillator are available such as the Pierce, but these can be tricky to design and ensure they work correctly. Rich

Posted in Electronics

Breadboard power supply

I am currently trying to document the various electronics I have done previously. A brief page about my breadboard power supply is now available.

Posted in Electronics