Shared Projects

AVR USB LCD Interfac

Brain for mouse junkbot

TRS-80 Model 4 (Gate Array Version) ROM B/C EPROM Adapter

This board allows a 2764 EPROM to be plugged into the ROM B/C socket (U4) of a TRS-80 Model 4 computer. It is applicable to the gate array version only, which is easily identified by noting the orientation of the RS-232 serial port connector. That connector will face towards the rear of the gate array version computer, or downwards on a non-gate-array version computer.

ROM B/C is an MCM68A364 mask-programmed ROM, and it is not pin-compatible with common 2764 EPROMs. This board adapts the pinout, and also allows the original mask-programmed ROM to be reinstalled and selected with a jumper or remote switch.

The primary motivation of this project is to support the new auto-boot menu feature of the FreHD hard disk emulator without requiring soldered modifications of the computer itself, and also allowing the original ROM to be selected when desired.

Design files for this project may be found at:

https://github.com/NF6X/M4-GA-ROM-BC

Additional information may be found at:

http://www.nf6x.net/tag/M4-GA-ROM-BC

M4-GA-ROM-BC is a free hardware design: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

M4-GA-ROM-BC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with M4-GA-ROM-BC. If not, see http://www.gnu.org/licenses/.

cape v0.2

AD75019 Breakout Rev1

arduino board

simple arduino clone

0.1

Breakout board for WIZnet’s W5500 with a MagJack

Adapt 6 and/or 10 pin AVR ISP to breadboard. This is essentially the same as SparkFun’s #8508, but it’s 93.3 cents instead of 95 cents a piece and free shipping! But, of course, you need to buy them 3 at a time…

Halogen LED replacement light

16F628 Display Bluetooth Serie V2

bruce receiver

Arduino shield for programming multiple ATtiny microcontrollers: ATtiny13, ATtiny15, ATtiny24, ATtiny25, ATtiny44, ATtiny45, ATtiny84, ATtiny85, ATtiny2313, ATtiny4313. shared by Kai Bader

A breakout board specifically designed for xmega 100-pin TQFP microprocessors

modularLED Matrix

Bluetooth Low Energy Serial Interface using the BLE112 by Bluegiga. Firmware is based on their serial cable replacement example BG Script and the work done by Dr. Michael Kroll. Board is designed to interface like FTDI-based boards/cables. Solder jumpers on the back allow you to choose to use hardware flow control or support low-power host/BLE wakeup such as that used by Jeff Rowberg’s BGLib. BLE112 programming is accomplished with a TC2030-IDC-NL cable from Tag Connect. I have also made an adapter board for this cable so it can be easily used with a CC-Debugger.

C1, C2, C3 = 1uF

C4, C6 = 2.2uF

C5 = 0.47uF

R1 = 1kohm

R2 = 10kohm

U1 = MCP1700T-3302E/TT

Connection LED = Blue, 0805

Bluetooth Module = BLE112-A-V1

All passive components are 0805 size.

Design files are on GitHub