Shared Projects

12 digit bubble display Using 3 4 digit HP displays. For use with Clock2 board

https://www.dropbox.com/s/0xb0stdouhya9ia/Rissole.pdf Lovetone Meatball, see build doc

Babies First PCB

Remote LED Strip Controller for making 4 digit 7segment ledstrip display Needed : 1 Wireless Module : NRF24 8 * Solid State Relays LCA710 1 Shift Register 74HC595 2 capacitors (10uF) 1 3.3V voltage regulator 1* Arduino Nano Terminal Blocks

An arduino-based voltage display / fuel gauge for a Crazy Cart or pretty much anything

MS2TBI Adapter

For the Elektroboj’s workshop

SA612 experiment board

AVR MCU with RS-485 driver - the mini version

http://www.diyaudioprojects.com/Tubes/6DJ8-Tube-Headphone-Amp/

This board is for a RedBear Blend Micro and a L293D Motor IC for a robot controlled by an iOS device. I’m making it public since I’m creating a blog post about it. You can see video of a robot created with this at https://www.youtube.com/watch?v=7EnJnTnK5mI (skip to 0:27)

This board is intended to stack on top of a Mojo FPGA development board (v2 or v3) and connect to it a 68SEC000 CPU.

This is the first part part of a multi-part project to slowly build a DIY computer based on the 68SEC000 CPU, using an FPGA to implement an MMU and graphics adapter.

Breakout board for QFP ICs.

This design allows QFP packages of up to 48 pins to be broken out to 0.1" header. The specially-designed chip footprint supports smaller pin counts via elongated pads that extend through the underside of the chip.

The board is two-sided; one side accepts 0.8mm pitch and the other side accepts 0.5mm pitch.

A pipelined ADC designed with discrete components.

2 Light Chip

Simple 8 LED board for quick Arduino breadboard experiments.

• 8 resistors 0805
• 8 LEDs 0805
• and 9 pins

For example blue LED + 1k resistor consumes 2.2 mA.

• Images of final board.
• Video of final board.

A 9X RC transmitter controller based on the Gruvin9X 4.2 design using an ATMEGA2560 MCU. This is a 4 layer ultra compact design to be retrofitted into almost any reasonably sized non-Turnigy/FlySky case. All 4 layers have copper planes for voltages and ground including a portion for Analog Ground. Extensive 0805 SMD components are used on both sides along with other SMD transistors and ICs. The slightly larger 0805 parts are easier to solder for most people than the 0603 parts on the original Gruvin board, but since parts are installed on both sides this will be a tedious board to build.

It is designed to use the 26 pin East Rising 2.9" 128x64 back lighted LCD display as is common on ebay and is set up to use a cheap, simple ebay sourced Micro SD card with built in LDO and level shifter to interface between the MCU and the SD card. An original Turnigy 30 pin LCD should be able to be used if several unused pins are trimmed off the connector end of the flat cable. You can figure out which to trim if you are willing to undertake this project.

Some liberty is taken from the original Gruvin9X design since there is no support for a charger, a trainer port, or EL Back Light. The power on soft high side switch is simplified by using an integrated switch device. Control signals from the MCU that supported some of these eliminated functions are taken to test points and can be rewired easily if these functions are needed or can be used for other controls. There are stouter LDOs for 5V Vcc and the Haptic Motor and the 3.3V supply that is on an externally available AUX connector is capable of at least two hundred mA. The 5V Vcc LDO is also capable of several hundred mA for external use as well. All connectors are numbered the same as the Gruvin design (also the Turnigy numbered-I think).

Mounting holes are provided but are not matched to any particular TX case–a perf board mounting the front panel switches would be used as the mounting board for this controller and would need to be matched to the case.

This board has not yet been tested but has been thoroughly checked against the public domain Gruvin9X schematics. Given that it has extensive copper planes, signal integrity, especially in the analog portion, should be excellent, with little crosstalk.

If interested in building this I will update the silkscreen for added detail on the board, and I can supply .pdf schematics, excel BOM information and gerber files. Please contact me at larry dot shorthill at gmail for added info.

This is a rendition of the Dragon Lair board by Nard at: http://www.aplomb.nl/TechStuff/Dragon/Dragon.html

The POD-JTAG connector, J1, is not pinned out for standard JTAG pin sequence but is based on the improved signal integrity pin out as described by Kasper (KKP) in this document: http://n1.taur.dk/permanent/dragonhide.pdf

A small descrambler board at the end of the JTAG cable in the vicinity of the target IS REQUIRED to rearrange the signal sequencing for standard pin-out JTAG connectors. This descrambler is a very simple board and can be implemented with a small vector/vero board type circuit as a POD at the end of the ribbon cable. See Kasper’s .pdf document for information. An example of this board is available from my projects and is called DRAGON LAIR JTAG CABLE POD.

This is a protection/buffer board for the Atmel AVR Dragon programmer board that has some weaknesses due to cost constraints in Atmel’s design of the AVR Dragon. As in the designs by Kasper and Nard, there is no provision on this board for high voltage programming, which is possible on the Dragon. Be careful if you use the high voltage programming for resetting fuses and refer to the Atmel documentation. DO NOT USE this board for that application.

This is for the second version of the Dragon that has the mounting holes for mechanical purposes but it should be able to be used by the earlier version if mounting is done with some sort of sticky foam tape, etc.. This board piggy-backs over the Dragon and has a USB2.0 type B connector for power only oriented just above the USB2.0 type B of the Dragon. The Dragon needs to be powered by a powered USB HUB anyway, and this board optionally can be powered by another port of the same HUB if the target board is not to be self powered. Three selectable hub powered voltage regimes are allowed: +3.3V, +5V, and default target self-powered and these are pin strap selectable with the left 2 pins (+3.3V) or right 2 pins (+5V). The self powered default operation entails putting a 2 pin strap in the middle of 4 pins on the connector above the USB connector (for storage only–the pin strap can be left off for Default, I just like to keep it handy). The voltage of the target in any case is present for the Dragon to sense on its JTAG connector, J6 or D-JTAG to set the correct I/O level on the Dragon’s output structure. There is no provision to power the Target from the Dragon–this is a condition that is not recommended, so the USB HUB is there to do this function.

Please refer to Nard’s website and Kasper’s document for additional information on operation and usage.

All SOT-23 devices are BAT-54C dual Schottky diodes or equivalent (common cathode) and are optional for improved signal clamping to ground and power. The 2 pin header next to the RED LED is the +5V power for that LED and it can be supplied by the AVR-Dragon board. +5V is not used elsewhere. Square pad is the + side. All other components are pretty much annotated on the silkscreen. Caps that are polarized should be installed with + terminal on the square pad and in a few cases, non-polarized caps can be used instead. All of the ribbon cable headers are IDC type and are polarized so pay attention to the notch notation on the silk screen and install with the connector housing notch oriented correctly to the silk screen. The t-DW 4 pin connector is a right angled 4 pin header. A polarized connector style can be used in that location if desired.