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WildDrone Locator
Project by MihaiVDR
"Safety First!", we often hear. Mounted on a drone, this beacon says "I'm here!" in LoRa language.
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Thomas Atmospheric Dryer
Project by David Thomas
15% of the population or 21 million in the US could save $100 a year
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TMD-1: A Turing Machine Demonstrator
Details from TMD-1: A Turing Machine Demonstrator
Turing Machines 101 The Turing machine was invented in 1936 by Alan Turing. By providing a mathematical description of a very simple device capable of arbitrary computations, he was able to prove the properties of computation in general. A...

Peak Performance Revisited
Log from SpiroBoard Aeroponics pH / EC / Motor Controller
I recently revisited the peak detect issues after a long break working on other projects. I was still dissatisfied with the accuracy of the peak detect circuit. I spent an evening playing around with LTSpice trying various tweaks...

Fourier Fit to a Plane Curve for animal tracking
Details from Fourier Fit to a Plane Curve for animal tracking
Ghosh and Jain (1) showed how to charactize a simple, closed, piece-wise linear curve as a Fourier series in a single parametric variable. Such a formulation allows (see Tsow and Land below): interpolation of curves by sampling the parameter more densely.morphing...

Logic board interface
Log from MS6205 graphical mode
Edit: I had KSI1 and KSI2 mixed up. I fixed the pin and graph descriptions. After connecting an oscilloscope to the different pins of the logic PCB-anode PCB interface I think I've got enough info to work on driving every connected pixel. The pins are...

Bat Sonar
Details from Bat Sonar
Video showing the bat sonar in actionThis video shows the sensor in action. The left graph shows the identified targets. The size of the circles indicates the strength, and the location on the graph is their measured location. The graph...

PC style RTC (DS12885) for RC2014
Details from PC style RTC (DS12885) for RC2014
Although the hardware supports both a Motorola and an Intel style bus we actually use the Motorola interface. This is because the RTC expects a multiplexed Intel style bus as used by the 8085 and some microcontrollers. It's actually easier to abuse the...

Logic probe
Details from Logic probe
There are three LEDs, the blue one for Low level, red one for High and yellow one for pulses, which are displayed as 200 ms flashes.The open input is detected in an unusual way. Output A0 generates square wave output, which is fed to the probe tip via...

Basic Oneway Code Complete
Log from An Old Fashion Acoustic Modem for the iPhone
An Integer Version of the DemodulatorAs the code will be ported to a lowly Arduino using C code, I first looked at if I could use 16 bit signed integers. The answer is strictly yes. Strictly in that the 32 bit result of a 16 bit multiplication is not...

My own try at a RingO9 with 2N2369A
Log from Hackaday TTLers
Edit: See also More 2369, with more caps !With a sporadic and limited access to the workshop (at last !) I can finally try new ideas ! I have meanwhile received 9K PMBT2369 in SMD but I decided to use the old stock of 50pc 2N2369A in metal can, that...

RPN + BASIC on SmartResponse-XE
Details from RPN + BASIC on SmartResponse-XE
I have found the SmartResponse-XE an interesting "Arduino-compatible" device. With BASIC installed and the added "Q" token (alias for PRINT) to allow realtime evaluation of simple math. However, the math functions of "+", "-", "/", "*" all...

Sound
Log from Dodo: 6502 Game System
All along I knew I wanted to figure out sound for Dodo because a game system just wouldn't be right without it. I have been going back and forth with lots of different approaches in my mind. Dedicated sound generation chips that mixed both digital and...

3. Fundamentals of Hexapod Robot
Log from Hexapod Modelling, Path Planning and Control
In this chapter, the fundamental concepts of hexapod robots such as walking gaits, stability, kinematics and dynamics are covered which are essential to obtain a better understanding of the control architecture that is delivered in the next chapter....

Everybody loves benchmarks! The numbers are in!
Log from Bit-serial CPU based on crossbar switch
When calculations are done 1 bit at a time, one should probably not expect blazing speed. To measure the clock cycles per operations, I simply baked a 8-digit BCD counter into the system and increment it at each cycle, and reset to 0 at each...

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