- 1 GVSDuino Features
- 2 Headers/Connectors
- 3 Board Dimensions
- 4 3D Printed Open Frame
- 5 Assembly Sheet
- 6 Factory Test
- 7 Past Revisions
We love the Arduino but have always found several aspects of deploying Arduinos into real-world applications to be particularly troubling. Our frustrations center around:
- Lack of decent mounting holes
- Limited number of power and ground pins
- Size of the card
- Jumper wires don't hold in female sockets very well
Not long into our time with the Arduino we discovered Sensor Shields. They solve the limitation for power and ground pins by providing a matching power and ground pin for every signal line. They also have male pins which tend to hold female cable pins better.
Sensor shields don't solve the size issue. In fact, they make the volume larger than it needs to be. They also don't change the fact that the mounting holes on the Arduino are difficult to use. The pins are either too close to connectors or power and we are always afraid of shorting them out in metal cases.
We wanted something that would address all of these limitations so we came up with our own card, the GVSDuino:
- GVSDuino takes two awesome boards and puts them together on one board taking the best of each and improving on both.
- The board is a minimalist Arduino design without a USB interface so it requires an FTDI board such as the USB-to-TTL Converter board to connect up to a Host Computer.
- The board has GVS connectors for all of the Processor I/O pins.
Digital D0-D13 GVS Headers
The Digital GVS D0-D13 headers surround the Microprocessor. The square pins are pin 1. The Microprocessor I/O connections on the headers are:
Analog AD0-AD5 GVS Headers
The Analog GVS AD0-AD5 headers surround the Microprocessor. The square pins are pin 1. The Microprocessor I/O connections on the headers are:
|2||APS Jumper selection|
- A4 (SDA)
- A5 (SCL)
J2 - DC Power Connector
2.1mm connector. Center connection is Plus (+) and outside is Ground (-).
J3 - In System Programming (ISP)/ATProgHead Connector
This connector allows an ATProgHead to be used with the GVSDuino. The ATProgHead is used to program Arduino Chips and Arduino cards which have ISP Connectors.
|Pin||Function||Arduino ISP Function|
J4 - FTDI Connector/Header
Analog Power Selection Header
|1-2||Power Analog pins from +5V|
|2-3||Power Analog header pins from Processor AREF|
Board Power Selection Header
|1-2||Power board from J2 connector|
|2-3||Power board from FTDI|
The board size is 49mm x 49mm.
The mounting holes are sized to support 4-40 or M3 screws.
3D Printed Open Frame
- (2) LED-Test or LED-TEST-2 cards
- Cable set
- Wires D2-D13 and A0-A5 to LEDs
- Screwduino Test software
- Unit Under Test (UUT)
- Install PWR jumper onto REG DC (J2) pins
- Install APS jumper onto VREF=5V pins
- Power card at DC jack J2 at 9V
- Check DC power at D0 (pin 1 = GND, pin 2 = VCC) using Voltmeter
- Result should be 4.90 to 5.10 V.
- Unplug power jack
- Move PWR jumper onto FTDI pins
- Attach FTDI cable at FTDI connector noting Ground position
- Attach LED test cards
- Plug in FTDI to/ USB from computer in
- Download Screwduino_test.ino to the UUT and run
- LEDs should all blink in order
- Download Blink sketch and run
- D13 LED should blink
- Disconnect USB host
- Mark test block on board rear
GVSDuino Rev X4
- ISP connector didn't work
- Suspect that the RESET line on the ISP connector goes to the wrong side of the reset capacitor
- Cut trace ARDRES U1-5 and U1-6 on rear of board
- Add wire U1-1 to J3-5 (signal is new RESET line)
- Rework worked
GVSDuino Rev X3
GVSDuino Rev X3 is a fantastic card but we wanted to change a couple of things.
- We wanted to be able to use an ISP cable to directly program the card.
- The pinout of the ISP connector was intended for the ATProgHead design which had a difference on the reset/D10 pin.
- We also wanted to connect up the extra pins on the extended header.
- We wanted to add the land-boards.com web address onto the card.