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FAT32 File Format
Log from OSI SD Card Operating System (OSISDOS)
When you search google for FAT file format you get tons of pages on formatting disks. It's harder to pull out the detailed format of the SD card. Wikipedia to the rescue (Design of the FAT file system). A less technical FAT32 Wikipedia page is File...

Hacklet 39 - Battery Power
Log from Hackaday.io Project
[robin] has a Red Camera (lucky!), an absurdly expensive digital video camera. As you would expect the batteries are also absurdly expensive. What's the solution? Battery packs from cordless drills.Cordless drills are interesting pieces of tech that...

Initialize Log
Log from Bendulum Clock
2/27/14 Finished first round of postings here. Still to go, Eagle files for two versions of Arduino shield -- with and without battery backup.

Add Escapement PCB
Log from Bendulum Clock
3/1/14 Add information for escapement pcb. Still to go, bendulum clock pcb. This has the same functionality as the escapement pcb but also has NIMH battery backup to keep the clock going if the power fails.

E-Beam Power Supply Repair
Log from Vacuum System for Deposition
With the generator running well and the interconnects made for the power supply and control box I decided to power the thing up and see if it worked. I fired up the generator and flipped the breakers on the front panel. Filament voltage was good. After...

Tricorder case finished
Log from JJ Tricoder
Doh!0,35mm nozzle print head on my 3D printer fell apart, from unknown reasons, just before I wanted to print parts for JJ Tricorder case. You know, Murphy's laws. I had one spare, however with higher diameter, something like 0,6mm or so, but I had no...

Gateway 1.7. pre-order
Log from Home security
Gateway PCB is in fabrication, and I'm hoping for the best that there will be no errors on PCB. It will have following parameters:MCU ATmega1284P, 16KB RAM, 128KB Flash.8 analogue inputs for balanced PIR sensors.4 digital inputs for simple sensors, like...

[27-05-2014] New remote web interface
Log from Raspberry Home Automation Cluster
Made a new php based remote 'webapp' for my phone. It allows me to control the lights, and the central ventilation system. See the project pictures for a screenshot. The ventilation system is also triggered by a cronjob. It will shut off at 23.00, and...

chaos everywhere
Log from Towani Lifesign Wristdevice - Star Wars Ewoks
Today my printrbot simple broke down on me, the hotend won't heat anymore - so there will be only one wristband. Meh. And I don"t have the arduino pro minis yet nor the leds so I had to improvise on the wristband. So backup strategy now will be round...

Adding the brains and... a problem
Log from 3D Printer
Step 2: Motion. Time for a RAMPS board! After a lot of hunting around I decided on the "Ramps 1.4 Mini Set" from gadgets3d.com. For only $90 it came with RAMPS 1.4 board, 5x G3D stepper drivers, cooling fan, SD card reader, 2x thermistors, and wiring...

Ouroboros, God of design
Log from 5+ Axis Robot Arm
Solutions create problems create solutions create problems....Added the rotation sensors. The caps over both sensors do two jobs. The first is to keep grit out - I'm thinking ahead about the Ingress Protection rating. The second is to hold the sensor...

$150 chips, fried
Log from 5+ Axis Robot Arm
Talk about an expensive meal. In building the prototype PCB to drive the system today I managed to put 12v through a 5v rail and fried three polulu stepper drivers ($15ea) and five rotation sensors ($20ea). I have backup polulus, so at least I can make...

Ignitor
Log from Unity Candle
Ignition is handled using a Hot Surface Ignitor. These are frequently used in modern gas driven furnace's and hot water heaters, and are available on the parts market, around 30-50 USD. Simply power them to rated voltage(some are 120VAC,...

Success!
Log from Unity Candle
The wedding was this past weekend, and was a great success! I'll have a video, a summary and maybe some more pictures up soon, but wanted to get this out there. I setup bright and early in the morning, getting everything installed and ready before returning...

Trackball Install
Log from Mouse Controller Project
This would not fit inside my trackball.Chopped it, soldered it, hacked it.Dead bug style. I soldered the wires long through the holes to keep air space underneath.The black 20 gauge wires soldered on top work with the female jumpers. These are for backup...

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