This card will be available through our site after the Kickstarter completes.
Like a lot of folks we got excited when the Raspberry Pi was first announced. We couldn't wait to get our hands on our first board. When our chance came to get a Pi we also bought a prototyping board so we could connect up our own devices to the Pi. We anxiously awaited the arrival of our card. It felt like our card would never arrive.
While we were waiting, we dug deeper and found out that Raspberry is limited to 3.3V I/O and we realized that the devices we already have for our Arduinos are 5V parts that would not work with our Raspberry Pi. Sure we could adapt one of the 3.3V to 5V converters out there but that sounded like a lot of work. What we really wanted was a way to allow our 5V parts to connect to the Raspberry Pi without a lot of hand wiring but we couldn't find a card out there that does the 3.3V to 5V voltage conversion that our 5V parts need.
So we designed a card to meet our needs, the RasPi-GVS Card.
We Kickstarted this card once before but it didn't reach the funding goal. We think this is a great card and want to take another shot at offering the board to the Kickstarter community.
We also have a configurable 8 channel version of this card on Kickstarter. If you can get by with eight or less 5V lines and you want a mix of 3.3V and 5V that card may be a good choice. If you need more than 8 lines of 5V then you need this card.
What are we doing differently?
- We are reducing the price for the card by removing the DC Power Supply parts.
- We are reducing the funding goal. After all we did the development on the last time through and don't need as much help this time.
- We are running the campaign longer.
- We are improving our board test methods to help reduce costs.
What are we keeping the same?
- We are keeping the same great voltage translator parts which we used last time around.
- We are keeping the same board outline which works great.
- Daughtercard to the Raspberry Pi (you supply the Raspberry Pi)
- 3.3V to 5V bidirectional voltage translators on 16 GPIO (General Purpose Input/Output) lines as follows-
- (7) 5V GPIO lines on GVS connectors
- (2) 5V SPI interfaces (can be used as 5 GPIO lines)
- (1) 5V UART (serial port) interface (can be used as 2 GPIO lines)
- (1) 5V I2C interface (can be used as 2 GPIO lines)
- GPIO_4 enables/disables the voltage translators
Resettable Fuse protection on the 5V power line - 500 mA limit
- 49x49mm card form factor with notch to clear the audio jack
So what do you think?
Risks and challenges
We have already built up the prototypes for this card. In fact, it's on Revision X3 and is a stable design.
Frankly one of the biggest challenges we face is getting the word out. We are Engineers and Computer Scientists not Marketers. We want to think that if you build a better mousetrap the world will find you.
Some part of this is education. In some cases, people don't realize what the advantages of GVS connections can bring to their design. We've tried to offset that by creating a video about GVS https://www.youtube.com/watch… .Learn about accountability on Kickstarter
- (39 days)