ceptimus

Mostly about programming

  • Decoding FrSKY telemetry data with an Arduino – Part four

    Now let’s look at the necessary code to transmit telemetry data from our aircraft. We have an Arduino on board the plane, connected to the telemetry port of our FrSky receiver. I used a D4R-II. The harness that plugs into the side of the receiver (at least the one supplied with mine) has red wire…

  • Decoding FrSKY telemetry data with an Arduino – Part three

    So now we want to add our own types of data. We’ll still keep the standard FrSky telemetry data for all the standard sensors, but perhaps we want to send additional messages – these might be strings of characters, floating point values, integers, even possibly an image from a camera (though an image would take…

  • Solids of constant width – the Meissner Tetrahedron – in OpenSCAD

    Lots of people know about curves of constant width – for example the UK 50p and 20p coins: despite their apparent non-roundness they have constant width when measured by parallel jawed calipers or the mechanisms inside vending machines.  If the shapes of these coins are extruded as prisms they can be used as rollers for…

  • E-paper display module driven by Arduino

    These E-paper displays work well and look nice.  At the time of writing you can get the 1.54 – inch size (200 x 200 pixels) from Banggood, but there are other sizes in the same range and my code should work with the bigger ones too.  I have one on order to test.  Search on…

  • Revisiting the MinAttak chess problem

    I blogged about my old Java Applet for the chess minimum attack (dominance) puzzle previously here. But of course Java Applets are now deader than a very dead thing that’s also been poisoned, burnt, and crushed.  I’ve been playing around trying to learn a bit more JavaScript, and as a learning exercise, I coded up…

  • Decoding FrSKY telemetry data with an Arduino – Part two

    In part one, we looked at the standard FrSky ‘D series’ data packets that provide voltage and RSSI information.  In this part two post we’ll consider the data format used by standard FrSky telemetry add-ons and how to decode the data from those without using a Taranis transmitter or a commercial display unit.  In part…

  • Decoding FrSKY telemetry data with an Arduino

    I used a FrSKY D4R-II receiver and a DHT DIY Tx module with an Arduino Pro Mini for the purpose of this post.  These FrSKY products use the older “D mode” telemetry and the DHT module is now discontinued, but I’ll be updating this post to deal with the newer S.Port Telemetry soon.   There…

  • An Arduino-based programmer for the AT89C2051 chip – part 2

    Part 1 Here’s the software necessary to work the programmer board: Arduino sketch (for Arduino Mega 2560) PC program See also part 3 with a Python program that runs under Linux Here’s a screenshot of the program in operation.  It should all be fairly self-explanatory.  Please send me a comment if you have any problems…

  • An Arduino-based programmer for the AT89C2051 chip

    The Atmel AT89C2051 is a low cost microcontroller in a 20-pin DIL package.  It runs MCS-51 (commonly termed ‘8051’) code.  It works from 2.7V to 6V at anything from 0 Hz up to 24 MHz.  It has 2K bytes of Flash memory to hold the program and 128 bytes of RAM.  It has 15 I/O…

  • POV source code – part 3

    If you’re trying to compile the source code with the Keil compiler, you’re probably getting error messages about ‘undefined identifier’ or similar.  This is because the standard Keil reg52.h header file doesn’t define all the necessary identifiers for the STC89C5x chips. We need to define the special function register (sfr) P4 = 0xE8; so the…

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