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The New Model
Log from Open Indirect Ophthalmoscope
The design models have been 3D printed and assembled. We made two devices, only the outer casings are different in the two models. One is printed on a SLS 3d printer (Nylon PA-12) and another one with an FDM 3D printer (PLA Black).Both the models are...

New V1.2 boards arrived incl. footprint fail
Log from µPower (beehive) SD logger
Update 12.06.18 - pics of the new board Not much cleaning done so far. They'll get their proper isopropanol cleaning when fully populated! top side with 18650 cell (LG-2) bottom side ---------- more ---------- Just soldered one of the new boards and...

SD Cards - PSoC to Z80
Log from 3-Chip Z80 Design
Now that we can read SD cards and have an I/O interface in place from the Z80 to do I/O mapped access to the SD card it's time to hook the two pieces together. To do this we will need to look closer at how Grant's code request blocks. The loader...

Tinymovr
Log from Ø32 BLDC Controller
Found out about the Tinymovr motor controller. Basically what I'm trying to do! Very cool, and my version 2 will use it as reference. I hope to make mine even smaller (27x27mm vs 40x36mm) and cheaper ($40 vs €89). I only need up to 13V (3S lipo),...

Frequencies
Log from Voyage 200 Upgrades
For some reason the 47 pF value for the caps is sitting in my mind. Either after 'calibration' the LC meter is so far off that it read both my TI-89's and my V200's caps 51 pf, both ~8% high, or both of them are within their 10% tolerance and reading...

Gathering information
Log from WD2002SJ Bench Power Supply
Tonight I gathered some reference/research material for this project. Fortunately, several others have done some really great work with this module, so here's credit to them: LTC3780 DatasheetBeyond Logic blog postTemplaro blog postGreat Scott videoJulien...

Next generation Kubelik - Abbado
Log from Audiophile-sounding DAC for almost no money
Here's the evolution of Kubelik based on my investigations into why Kubelik lost out in dynamics in comparison with Deca DAC.The filter now uses two inductors per channel, beyond the filter there's now passive I/V with a unity gain buffer following....

Filling cartridges Epson 702xl
Log from Invisible QR Code Navigation for Robots 2020
I filled cartridges will all the inks I have. I am likely to use noodlers and the UV absorbing ink , but I will start testing different labels soon. I picked up a Epson Workforce printer that uses these cartridges for 89 dollars from Office Depot. I...

MiCS-VZ-89T a low power air quality sensor
Log from Portable environmental monitor
Putting everything together also requires checking everything separately first. So I did with the MiCS-VZ-89T sensor, and here is the story, also presented on my blog: MiCS-VZ-89 Air Quality SensorA low power sensor that can measure at the same time...

Breaking AES using a $90 Development Board + OpenADC
Log from ChipWhisperer®: Security Research
Long ago when I started prototyping ideas, I was using a $89 FPGA Board (Avnet LX9 board). The ChipWhisperer system has always supported this board, but it's not as well documented as my newer, fancier hardware. I wanted to make a log post to demonstrate...

We get signal
Log from Reverse-Engineering a low-cost USB CO₂ monitor
Indeed, immediately after running the Windows software in a VM with the device connected I was getting a live data log of the CO₂ concentration! This screenshot shows me breathing into the vicinity of the sensor:Ok, time to disconnect the device from...

MORE RADII!!
Log from Hubsan X4 Replacement Frame
I haven't putzed about with the v0.1 base at all, but I think I've got a motor mount design that I like. It's got the split bolt setup for securing the motor (including a cutout for holding a 2-56 nut), and the legs are cool lofted dealies. Lots of radii...

Updated Playground!
Log from Dodo: 6502 Game System
It's been a minute but there is an exciting new update on Dodo! The original Dodo Playground is a bit long in the tooth and sadly Chrome Applications had been deprecated so there was no longer a good way to flash Dodo games directly from the browser. ...

Bug fix: the "ghost RTC"
Log from A 4$, 4ICs, Z80 homemade computer on breadboard
Reading this Japanese article on a kit sold in Japan to build a Z80-MCB, I realized the presence of a possible bug seeing this two images: As you can see, there is a Z80-MCB without any Virtual Disk or RTC attached and in the resulting screenshot the...

Fibonacci
Log from Gigatron TTL microcomputer
With the ALU verified and the RAM connected, today the breadboard determined that the first 8-bit Fibonacci number is 144. 0000 0000 ld $00 ; outer loop 0001 c200 st [$00] ; a=0 0002 0001 ld $01 ; b=1 0003 fc0a bra $0a 0004 0200 nop ; (pipelining) 0005...

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