(v1.2)

An adapter board for hooking up joysticks to a JVS I/O Board that uses JAMMA, specifically designed with the Sega 838-13683-93 REV. B in mind. This board is not designed to power the I/O, the I/O should be receiving power from another source (such as the CN6 header on the REV B). This design also assumes that your I/O board will provide +5v/+12v on the JAMMA connector (but it will be mostly functional without it).

Buttons 1-5 are on the JAMMA edge, button 6 is connected up to the 14 pin connector which is meant to be hooked up to CN3 on the REV B. Technically only pins 4 (P1 Button 6) and 8 (P2 Button 6) need to be hooked up on the 14 pin connector. All pins besides those 2 on the connector are NC. So, again, the only pins you would need to wire are 4 and 8 (which aren’t even needed if you don’t care about 6 button support).

The board has plugs for a +5v and +12v monitor, they are not required. There is also a 2nd plug for a +5v out, intended for use with a modified USB cable to power a Pi. These outputs will only work if the board is receiving power from the I/O board over the JAMMA edge (which is the case of the REV B is powered via CN6). On the 2 pin connectors Pin 1 is output and Pin 2 is ground. Theoretically you could possibly use these plugs as power input (as they connect to the JAMMA edge) to power the I/O, but the board was not designed for this.

The two resistors are connected between +5v and the coin meter pins on the JAMMA edge to spoof the existence of coin meters for games that require it. This will not work if the board is not receiving +5v from the JAMMA edge. The push buttons on the board are provided for ease of access to test/service/coin inputs, they do not need to be populated.

The board was designed to fit the following parts:

1. All plugs are 2.5mm pitch, designed for JST XH plugs.
2. The DB-15 connectors were designed for Amphenol’s L717SDA15PA4CH4F
3. The push buttons were designed for TE Connectivity’s ALCOSWITCH Switches (1825910-6)
4. The JAMMA edge was designed for a Suzo Happ female edge connector (with solder terminals), but should fit pretty much any JAMMA female connector. (Note: This board was designed for soldering a female connector onto the board, not for a female-female connector, the pins on the JAMMA edge on this board might be a bit too short to use a female-female connector, but it might work. It will for sure not work if your connector requires a slot for the Key, as this board has a pin (unused) in its place).

The DB-15 plugs use the wiring that should be found on most Superguns: http://www.thesupergun.com/electrical/standard-supergun-controller-wiring-diagram/

In case the site cannot be reached the wiring is as follows:

1. GND
2. Button 6
3. Coin
4. Button 4
5. Button 2
6. Right
7. Down
8. +5v*
9. NC
10. Button 5
11. Start
12. Button 3
13. Button 1
14. Left
15. Up

*As with the other outputs on the board, pin 8 will only be outputting +5v if this board is receiving power from the I/O board over JAMMA. The board will still function if it is not receiving power, but none of the outputs will work (whether or not your controller will work without the +5v on pin 8 depends on how it’s wired. Standard Neo Geo/Supergun controllers should function without it).

CO2 Simple Doser Controller

Companion board for PET2+ timer with DIP switch. Uses an Arduino Pro Mini and a MPU6050 (GY-521) 6-axis accel/gyro breakout board.

Home automation IR/RF hub connecting and ATMega(32/8)8 to and esp8266, an NRF24L01+, a 433Mhz transmitter and an IR transmitter/receiver pair.

I2C level shifter and Maxim RTC

Repository

https://github.com/wsender/rtc_devboard

DDm driver for Solarstorm/Fandyfire K2 lights.

Revision changes

• Full size SOT-89 pads for the 7135
• Unmasked L+ vias, to be solder-filled

Needs the DDm-K2-SW daughter board for the tactile switch and indicator LEDs:

https://oshpark.com/shared_projects/E7YKjPjG

‘Standard’ DDm parts list, except for:

• R1 and R2 are populated if MCU pin 7 is used for cell voltage monitoring. This could, however, be done using the software-only method of Vcc vs. the internal 1.1 V reference.
• R7 is populated when re-purposing pin 7 to drive a second indicator LED, as per the stock driver.
• There is an R1 on the back of the switch board. A jumper here rewires the two indicator LEDs in parallel, both to be driven from MCU pin 3.

Serial interface for KX2 and KX3

20 Button MIDI controller using shift registers.

USBDM BDM for
- Kinetis (SWD)
- HCS08
- HCS12
- CFV1
Documentation available at Sourceforge.
Software information available at Sourceforge.
Design files available at GitHub.

USB isolator

R9 and D1 are only needed if indicator required

Bridge both FS or both LS pads with solder / 0R 0402 to set full or low speed modes

Kicad files

https://github.com/djdt/kicad_usb_isolator

Probe V2

Door strike/magnet controller for BeagleBone; see project at https://github.com/bubbapizza/BBBdc

An interlocking digit for 7 segment displays. Uses 3mm flangeless LEDs. Common Anode.

sample holder bottom board

bias board

Sample Holder 4K MScope

Simple momentary tactile with FET relay for Yezl Y3.