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Step 3 - IMU and BLE functions
Log from Personal Guardian
IMU functions The Arduino 101 Inertial Measurement Unit is fully documented and works well. For the fall detection, the software detects a short period of freefall followed by a shock. Both events are handled via callbacks: void imuInit(void) {...

Control Board FPGA Pinout
Log from BARCO NX-4 GROUP REVERSING ADVENTURE
I might be missing a few connections yet which I'll correct as I come across them, but here is the pinout of the XC3S250E FPGA on the control board. Note that the SRAM and the Flash share an interface bus. Also note that the JTAG interface...

Interfacing ternary and binary components
Log from Homebrew ternary computer
Ok, now it is kind of proven that binary CPLD (or FPGA) may implement ternary logic, but how we can integrate it with "true" ternary components, especially when CPLD is 3.3V and TRIMUXes are -5V and +5V? Answer is DG403 chips may do the job: Because...

Characterizing the Buck Converter
Log from Solar MPPT Charger for 24/7 "IOT" devices
First up, the latest revision. Small changes from the last version including tightening up various current loops in the buck converter and moving the battery-side transient TVS diode to the anode side of the reverse-polarity protection diode to...

V9958 - Beyond Hello World
Log from rosco_m68k
Development on the V9958 board continues apace, and after a false start due to a silly mistake in the first revision things are back on-track with a revision 1 prototype. The design is now validated and working really well. So far it's baby-steps in...

Extracting and purifying PHAs using mealworms
Log from Plastic-producing personal bioreactor system
In the first log I investigated the methods of growing bacteria, and extracting ,then purifying their PHA granules into usable plastics! A major roadblock is the usage of toxic solvents in the extraction and/or purification process. This means...

Joules to photons. Finally.
Log from Coin Cell Challenge...
Ok, sorry about the clickbait title; who can resist the promise of LEDs? I promise a photo of a lit LED in this log, so you don't go home empty handed. This log is a quick one to introduce an intriguing potential alternative to coin cells. I have...

Please, GCC !
Log from PEAC Pisano with End-Around Carry algorithm
I get tired of fighting GCC's weird code generator that won't get a clue from my source code. I'm (still) using gcc6.4.1 (2017, I know) but I don't know how to make it understand basic things... This is critical at my level because any little performance...

Conquering Clocks and Gremlins
Log from Dreamdrive64
PSRAM Challenges The PSRAM presented numerous challenges throughout development. One issue arose from the SSI clock divider, which could only be set to even integers. When the RP2040s were originally clocked at 266MHz to meet N64 SRAM timings and the...

Scientific papers on tree tomography, Part 2
Log from Exploring the internals of trees with sound
First paper: Elastic wave modes for the assessment of structural timber: Ultrasonic echo for building elements and guided waves for pole and pile structures (DOI: https://doi.org/10.1007/s13349-014-0087-2, though that goes to a paywalled copy) by Martin...

Top 100 Projects by Skulls
Log from Statistics for 2015 Hackaday Prize Entries
Place View Count Followers Comments Skulls Project Author 1 32400 415 56 148 Bench Power Supply The Big One 2 19900 370 38 142 3D Printable Robot Arm Andreas Hoelldorfer 3 48300 273 112 120 Luka EV MW Motors 4 4600 101 20 114 Eye Controlled Wheelchair!...

Top 100 Projects by Followers
Log from Statistics for 2015 Hackaday Prize Entries
Place View Count Followers Comments Skulls Project Author 1 32400 415 56 148 Bench Power Supply The Big One 2 19900 370 38 142 3D Printable Robot Arm Andreas Hoelldorfer 3 31700 333 21 88 Arduino anti-theft alarm shield IngGaro 4 48300 273 112 120 Luka...

Top 100 Projects by View Count
Log from Statistics for 2015 Hackaday Prize Entries
Place View Count Followers Comments Skulls Project Author 1 61900 273 85 98 EM-Drive movax 2 48300 273 112 120 Luka EV MW Motors 3 32400 415 56 148 Bench Power Supply The Big One 4 31700 333 21 88 Arduino anti-theft alarm shield IngGaro 5 29700 149...

FarmBot Genesis V3
Log from FarmBot - Open-Source CNC Farming
FarmBot Genesis V3 exhibits the following changes from Genesis V2: Updated bracket design to minimize the number screws needed, making assembly easier and faster and decreasing the number of partsSimplified cross-slide design combining 3 plates into...

Papers, Please.
Log from Bench Top 5-Axis Mill
I'm in the middle of a literature review in an effort to do two things. One, I'm looking to see what has been done before, and two, I'm attempting to sort out the math involved with designing machine tools well. Below I've the bibliographic entries for...

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