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Nixie drive voltage supply
Log from State-Based Nixie Digital Voltmeter
Tail-end of last year we were working on a nixie tube clock project. It ended up getting stalled by some other stuff, but while Novak was working on the microcontroller code I was grinding out a power supply and drive circuits. For drive circuitry we...

What's implemented
Log from AVR spectrum analyzer
You can see the progress in the quarterfinal video:Works:1st button - backlight control2nd button - 16 modes of spectrum and VU meter: https://cdn.hackaday.io/images/8052571408534158067.png3rd button - 8 different symbols to draw spectrum bars4th...

Final Assembly
Log from ROSCOE - A Scalable, Platform Independent Robot
Replaced Max232 chip with multi-drop mux board to perform TTL to RS232 to talk to motor controller. Board also provides RS485 and USB for the addition of those devices if necessary. Cleaned up sound by adding mass and damping to speaker box, as much...

It works!
Log from Smart Battery Tester
I'm getting close to finishing this project. I decided not to add a charger IC, as it would be very difficult to be able to charge all the different types of batteries I want to support. Right now I can test LiPo/LiIon, LiFe and Lead Acid batteries....

Wifi Module chosen
Log from Data Collection Terminal
I hooked up the USR WIFI232-S serial to wifi module to my laptop and spend a while seeing how well it connected to my access point from different locations. Only 4 wires were needed +3.3V, 0V, TXD and RXD so I was able to use a small USB to TTL converter...

Thoughts
Log from PC general purpose interface
Maybe I should ditch the CPLD and use a PSoC4 instead...With the CPLD I would have to use a dedicated USB interface IC.When using the PSoC4 I can use any kind of serial interface, and also the dedicated usb chip. Along with the extra features that can...

Making the Circuit more Permanent
Log from OpenIR - Infrared Remote Control
The tests so far have proven that the theory can be realised and so it is time to make the circuit more permanent. First task, move the circuit from breadboard to proto/perf board.The layout is nothing too complex and can be constructed out on...

IR Commands
Log from OpenIR - Infrared Remote Control
Revision A of the board is now working and can send a single IR sequence out to a device in the real world when the on board switch is pressed. If OpenIR is to be truly universal the system needs to be able to send a multitude of commands not just...

OpenIR Software Design Update
Log from OpenIR - Infrared Remote Control
Revision A of the board is now working and can send a single IR sequence out to a device in the real world when the on board switch is pressed. If OpenIR is to be truly universal the system needs to be able to send a multitude of commands not just a...

Driving the IN-12A
Log from Modular Nixie Display
The IN-12A nixie tubes are operated at very high voltages, and microcontrollers can't handle voltages much higher then their VCC voltage. So that the IN-12A's can be controlled by digital logic circuitry, it is required that we have some sort of device...

The Loose Threads in 2015
Log from VGAtonic
Hey folks, lots of new stuff posted over at the 2015 log of VGATonic.I recently pushed a couple alternate firmwares:One for 848x480 (and 424x240) VESA compatible 16:9 outputOne for 320x240 in 16 color NTSCGo check it out if you're still following along;...

The Mighty Power Reduction Register
Log from Snail Mail Notifier
The ATtiny85 is a really wonderful chip, it presents an array of features (timers, interrupts, watchdog, ADC, PWM...), but makes it challenging to use with a relatively low pin count, flash and SRAM. The fun doesn't have to end there though, once the...

Going Wireless!
Log from Voice Activated Power Sockets (Home Automation)
The main idea is to make the interfacing between the computer and the micro-controller board wireless. It is important to know that there are quite a lot of very cheap different types of off-the-shelf wireless modules available. Many of these modules...

Keyboard Interrupt Issues
Log from Cat-644
The keyboard caused me a lot of trouble throughout this project. It ended up being re-done twice!Reading a PS/2 keyboard is fairly straightforward. Here is a snip from my Project Details page:The PS/2 protocol consists of 2 signals: CLK and...

Another real-time update
Log from Cat-644
Another real-time update: The Cat-644 is no longer a naked circuit board. The two boards fit side by side inside a compact wooden case. I could have just put the circuit board in a box, and connect it through a KVM to my existing keyboard...

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