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Adding inputs
Log from Pro Trinket USB Keyboard
Now that sending of keystrokes over USB works as desired it's time to add the inputs. As mentioned before, the aim is to have 12 buttons (in a 4x3 keypad) and 4 rotary encoders.Keypad I'll be using encoders that also have a push button integrated. Those...

FLASH Chip Programmer
Log from Z80 Retro Computer (With Graphics)
I decided that at some stage I need to get some code into this project. I was previously thinking of using an atmega to load boot code to the CPU and then have the CPU boot to SD card. I am not so sure about using an atmega as a co-processor now that...

The Completed Arduino Due Shield
Log from CHIME RED
The Populated Arduino Due Shield, mounted on a Due. AND gate to prevent outputs from being triggered when the interlock isn't engaged as well as driving the TTL outputsInterlocked based on Keyswitch Input and RC + Schmitt Trigger Oneshot (Due outputs...

cymk, and poor temp resolution
Log from Arcus-3D-M1 - Full Color Filament Printer
I did some tests of the 555 timer based temp feedback. The resolution at operating temperature was poor ~7 degrees. The resolution at room temperature was a lot worse ~30 degrees. The refresh rate was also poor. Seems the sensor chip was outputting at...

Not your typical 'small' I2C module/Mt9D111 register crib-notes.
Log from Digital Holga
An important note to keep in mind from the Micron User Guide/Datasheet. In addition to having registers that run up to the range of 0xFF (255) instead of your more common 0x7F (127), the registers for various functions are divided into three pages (0,...

Thermal Printer adventure
Log from Pi-Print
The thermal Printer: I was first fascinated by the cheap thermal printer made by Cashinotech. Their model CSN-A2 can be found quite easily. By seeing the datasheet link, the printer might be compatible with ESC/POS protocol. It use a serial port at 115200...

Version 2 in the works
Log from Arduino openHAB Garage Door Control
I have been working on a version 2 of this system that uses a low cost esp8266 wifi module - http://kayakpete.tumblr.com/post/110860425884/garage-door-controller-with-esp8266-runningYou can see the garage door sensor simulated as a push button in this...

Project update without content
Log from Psioπ
tl;dr - No progress as of last time. I'm considering another display model, and I'm hoping to assemble the final USB keyboard driver soon.No, neither me or my project are dead, but there hasn't been much happening for a while, mainly because of work.One...

Pump, sequences and LCD display
Log from Budget BarBot
Pump arrived, a doddle to hook up, seems to work well, will check the flow rates this evening. Its louder than I had hoped but hey ho.LCD display found in parts box (and I2C backpack), basic feedback given. will form the core of the HUI (with buttons).Sequences...

One-Shots Soldered... now for the "fun"-part... & 5V TTL at 3.6V
Log from sdramThing4.5 "Logic Analyzer"
Soldered up the one-shot circuitry. I'm now calling this sdramThing3.5, as it is no longer backwards-compatible with the old code without removing the chips from their sockets and jumpering some pins...There are two types of one-shots necessary:The Chip-Select...

Oy!
Log from sdramThing4.5 "Logic Analyzer"
Been hacking at this thing for seems like ages...I've revised nearly all the code, just to try to get it working in a way it *should've* worked from the start...Seriously, logic-wise, the only change that should've been necessary to the code would've...

This Dang Thing...
Log from sdramThing4.5 "Logic Analyzer"
...worked surprisingly well, considering how convoluted the concept and the code.I've been hacking at this thing for what seems like ages... I think I said that once before, and *that* seems like ages-ago.This thing is *huge*. I can't believe I wrote...

potential game changer found on old motherboard
Log from sdramThing4.5 "Logic Analyzer"
I've seen bidirectional "bus switch" type chips, before... but in my experience they've generally been found to be quite slow... Plausibly, I was somehow stuck on something like the 4066, which wasn't really designed to switch data, but analog/audio?Needed...

74HC = functional
Log from sdramThing4.5 "Logic Analyzer"
mmmm kay...So, my logic-reasoning seems, at least, 1/3rd correct... Switching to the 74HC series has made it functional in "one-shot-bypass" mode. Which, it shoulda done *ages* ago. I still don't understand how it could've *not* worked, previously......

IT'S ALIVE!
Log from sdramThing4.5 "Logic Analyzer"
The ONE-SHOTS WORK!The pseudo-vernier-scale idea worked, with a little tweaking... Automation of determining the offset (between the column *requested* to be written and the column *actually* written) is now possible.And, a good thing. Because....I replaced...

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