CrossRoads "Arduino" inspired designs. Need something custom? Contact

Mega Screw Shield. 86 screw terminals to let you securely connect your signals and your shields. Fits all Mega board variants: Mega, MegaADK, Due, Ethermega, Etherdue.

New August 2014: Expanded power & ground terminals added for 3.3V and 5V. Board lengthened at the power connector end for additional screw down  holes.

$37 each kit. $52 for assembled boards.  US flat rate shipping $5.35. International: please ask for your country. Paypal fee added to the total, 4% for US, 5% international.

$35 each kit. $50 for assembled boards.  US flat rate shipping $5.35. International: please ask for your country. Paypal fee added to the total.

Limited quantities left, about 10:

Here's a shot of a screw shield on an EtherMega with an addiutional shield added on top, all mounted in a enclosure

Bubblelicious: a nice little 8-digit display controlled by a MAX7219. $12.85 each plus shipping & paypal fee.
If there's interest, I can get more until Sparkrun runs out of displays.
The 10uF can be mounted flatter, or on the back. In & Out connectors for daisychaining.
The holes for the display have double rows to accommodate a right angle socket, 2 of mouser 575-2994331211. More application pics & an SPI code example here:

New Board - the Cube Driver! Designed for driving up to 9x9x9 single color LED cubes, with cd74AC164, 24mA current drivers, and AOI518 or AOI516 open drain current sinks. Using direct port manipulation for slave selects and fast 8 MHz SPI interface for shift register data, needs just 20uS to send out a layer of data. Can be driven by any Arduino board. Cascadable too!   

$41.50 for a kit, $56.50 for an assembled board. USPS flat rate shipping and paypal to be added, contact us for details. Schematic    PL

Connected with 12 inch male-terminated wires and crimp housings. Our cube is coming along, 2 more layers to go!

Modeled after the Solarbotics Ardweeny, but adapted to have the 1284P on wirewrap socket headers instead of sitting under a board and having to solder all the legs to something.  Killed your chip? Pop in a new one!
Header for offboard FTDI Module (can be right angle or vertical), "L LED at the edge of the board. Cuttable traces for Vcc from FTDI, DTR from FTDI, and for the L LED if you don't want a light.
$21.25 plus $5.25 USPS shipping to US addresses; international shipping is usually more.
$7.50 extra for an FTDI module - the one I use has a micro USB connector.
paypal to cardinalflyer at comcast dot net.

Schematic & Layout

Bobuino2, builds on the original Bobuino, makes USB/Serial easier to assemble, adds lots of connection options besides just shields - signal/power/ground available at each pin location. Here it is fully decked with screw terminals and onboard FTDI Module, and with no screw terminals and an offboarrd FTDI module. SD card with 74HC4050 SPI buffering, MAX3232 for RS232 on Serial 2, battery bacled DS1307 with 32.786 KHz crystal.


Assembled board with no FTDI components, no screw terminals:  $69.50
Assembled board with right angle header & FTDI Basic with micro-USB connector, no screw terminals: $76.50
Assembled board with MIKROE483 FTDI module mounted on board with mini-USB connector, no screw terminals: $78
Set of 3.5 pitch screw terminals: Add $5.35
Shipping via USPS for up to 4 boards: $5.35.  International: please contact as rates vary by country. Generally ~$20-24 for tracked, insured USPS shipping for up to 4 boards.
Paypal fee: add 4% US, 5% International to the total.

(5V regulator is missing in these pic's - they are on order and will be installed)

Schematic in PDF

Schematic in PNG

Core Files for Bobuino '1284P Boards

   replacement Pins_arduino.h to put in Bobuino variant folder
Exciting updates for the Atmega1284P & Arduino - read here.

Newest card - 32 transistor board with screw terminals, designed for  1A loads. Arduino Uno can be mounted above the card with standoffs to drive shift registers which control the AOI518 N-Channel MOSFET gates.

Available in kit or assembled form.  Short clip driving 8 segments of LED strips
and a longer clip on youtube fading up & down the channels by my son:
Kits available for $38, plus shipping (US: $5.35) and 4% paypal fee. International, ask for your country.

MAX7219 daisychainable breakout board for up to 64 LEDs. Breaks out 2-pins for each LED, connect them up & spread out however you'd like - big display, a globe, etc.

Kits for board as pictured with all headers, $12 to US addresses, includes padded envelope shipping via USPS & paypal fee. Assembled boards available for $25. Larger quantities will ship in a flat rate box.  International shipping - contact us for prices.

I used male-female terminated wires & crimp housings to make this little jumper cable to drive the board with SPI transfers.  shiftOut and other MAX7219 libraries will also work.

Demo of 8 LEDs blinking

I was asked a couple of times if there was an Uno version of the Mega Screw Shield. So I finally made one up. It looked kind of empty, so I added a prototyping area.
Here are some pics of the shield on an Uno and on a Mega.
The board is 67mmx77mm, has each header pins brought out to a 3.5mm pitch screw terminal, and to a pin in the 12x20 protoboard area, and the ICSP header will support ICSP connectors from other shields.
I bought 10 PCBs to try them out - I can send them out as kits for $14.50 each, in a padded envelope will be maybe $3 for shipping, or flat rate boxes for $5.35. Foreign shipping in padded envelope around $8. Assembled boards, add $5, will be shipped in flat rate boxes only.


ATMega1284P Duemilanova-style board with mostly thru-hole components (USB PTC fuse, 2 voltage regulators). Designed for easy assembly.
Kits less the MIKROE-483 USB module $27. Assembled boards $42.  MIKROE-483 onboard USB Module with USB-B Mini, add $9.  Offboard FTDI Module with USB-B Micro, add $8.  
$5.35 for USPS mailing to US address.  Paypal fee added to the total. Bootloaded Atmega1284P with Blink downloaded: no charge.
 Schematic Layout Assembly  PL for the ATMega1284P Thru PCB 

Exciting updates for the Atmega1284P & Arduino - read here.

12-digit, or 96 Bit, LED driver, using TPIC6B595. Kits $50.  Assembled boards $100. USPS flat rate shipping to US address, $5.35. International, rates vary by  country. Paypal fee added to the total.

Uses SPI to very quickly send 12 bytes to the Open Drain shift registers, rated for 150mA continuous, up to 50V. Tested with LED strings powered from 5V, string anodes connected to +12V.

Video of two cards with 10 driver chips each controlling a Nike Fuel Band display courtesy of ACSComposites

Schematic  Parts List (eagle export)

Dual ATMega328P Board! 40 IO pins. Headers to connect USB/Serial adapter, ICSP, jumpers to connect MAX232 for Serial.  

Add some jumper wires for chip-to-chip SPI, I2C, or UART-UART comm's. Bare boards $5 mailed to US locations. Kits, assembled boards, available upon request.


1284Mini. ATMega1284P-AU with 32 IO, Dual Hardware UART, 128K FLASH, 16K SRAM.  Schematic, Layout, PL

Bare Boards $3, Kits available upon request.

Core Files for Bobuino '1284P Boards
   replacement Pins_arduino.h to put in Bobuino variant folder
Exciting updates for the Atmega1284P & Arduino - read here.

The Bobuino!  List of Bobuino Rev17 features.pdf  (opens in new window) Not available except by special arrangement. See Bobuino2 above instead.

'1284 with LiPo charger, Arduino style headers, Xbee socket

Leonardino ("Little Leonardo") ATMega32U4 providing USB interface, with uSD socket on the bottom.  Bare boards $3.
Schematic  Parts List

12x8 LED Multiplexed Matrix Driver With USB/Serial Adapter

ATMega1284 Test  Board, ICSP & FTDI Headers

Relay Board with '1284, RS232, USB, directly driven relays.

OnTargetMarine, RPN4

Similar to Bobuino; ATMega1284, RS232 port, FTDI FT232RL USB, SD Card Socket, Screw terminals for 4 serial ports, power, 2 input buttons, 3 switch closures, additional SPI-Dual UART with RS485 interface drivers, 3 additional Status LEDs, Arduino shield compatible.

Fencing Scoring Machine and RF Remote Control

Smaller Fencing Scoring Machine

"Mini-uino", ATMega328P for very small Arduino clones, 1.3" x 1.3". Bare board $3. Kits, assembled board available upon request.  Mini-uino parts

"Digituino", designed to Drive higher voltage (12V) Common Anode 7-Segment Displays, using TPIC6B595, with RS232, SD card socket, ATMega328P

Swim Pace Display Driver

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