02/22/2017 at 23:19 •
Inspired by #Linear RGB LED Clockby Jan I decided to build my version. Instead of RGB LED addressable strip I'll be using regular LEDs and shift registers.
As I am planning to use the cheap chinese Digispark boards and a minimal of components. Since RESET pin is not available as I/O in most of the cheap boards I have only 5 pins to spare.
Two pins are for I2C communication with the RTC module
One pin will drive the shift registers using Roman Black's 1 bit shift system
The last two pins will be shared by a button and an LED each. Thus I need only three 8 bit shift registers (74HC595) for driving the remaining 24 LEDs
here's the draft for the circuit.
02/14/2017 at 18:38 •
The original project is very cool but it was build upon some ready made modules and a proto-board, so I've decided to route an specific board for the project named ZorkShield.
The board was designed to allow the assembly of both SD or MicroSD card slots and also allow the assembly of either a P2 stereo jack or a dual stacked RCA female for audio and video.
The video output have been slightly modified so the voltage and output impedance follow the RS-170 standard (like #VGA Blinking Lights). As a late time improvement I've added a RESET button.
Despite the board is a double layer It can be etched at home using tone transfer.
The layout was uploaded to OSHPARK but soon I'll upload it to github.
01/18/2017 at 16:07 •
Today I have received a Microchip news with AVRs on it. That's the first time I ever seen Microchip advertising AVR microcontrollers. Despite the acquisition of ATMEL by Microchip is old news now this ad still blows my mind, lol!!!