About this project
Thank you everyone for your kindness! The original goal of £1000 has been reached. You have made it possible and it only took 4 days!
I have been working hard on the project and the project is coming closer to the end. I really feel that we can get to the First Stretch Goal of 1500, so I have stared designing in some analog in ports. I also added extra couple holes for SDA and SCL and for A4 and A5 thus if you are using R2 or home made boards or some other arduino clone, you can easy wire up to support those boards instead.
Digital Pins are run just using two pins SDA and SCL Analog Pins are run by multiplexing A0 pin and giving commands using Pins 60-63 on IO shield.LM317 was moved to allow some room to bend it down so that you can stack other shields on top of it. External Power was moved as the previous position was little bin in way of DC plug on arduino
IO expander with Analog IO expander with Analog
Wow amazing! 60% of the goal reached in 24H Thank you thank you thank you. Biggest thanks to Craig Dunn for amazing pledge. I couldn't sleep most of the night and came up with some stretchgoals.
My name is Mantas and I live in UK. I love electronics making hacking modding and i love open source especially arduino.
As the projects become more complex the need for more pins or memory arises. Especially if you decide to add an LCD touch screen or attach multiple sensors or led's. That's why i would like to make and arduino I/O expansion shield. Using i²c protocol and 4 chips which will give 64 extra pins.
And the address changer will enable two boars to work together giving in total extra 128 pins The PCB will be shaped as arduino shield and made to be used on arduino uno r3 and Leonardo but without soldered headers can be easily added to work with other arduino boards, raspberry py or any other micro-controller that supports i²c. There will also be a feature to allow external power supply to the pins. And an easy to use library. Best of all its an open source project so the designing will be published on-line for others to improve.
Production Schedule and Method
All of the PCB will be made by great Chinese company who produced PCB for some of my other projects.
Finalising PCB layout 1 week. Then it will be sent to Chinese manufacturer to double check against the schematics. Any changes needed will be made during the second week.
First Batch Production and Testing
The production of the first batch ( for 15 early bird pledger's) will begin as soon as the 1000 goal is reached, but not earlier that two weeks.
Manufacturing and testing of the initial production will be done in early or late January 2014 (depending on when the goal of 1000 is reached). If all the test are successful 15 early pledger will get their Shields February. If there are any problems with the PCB the early birds will get the first boards of the final manufacturing run in early March.
After the initial PCB testing is done. In early February the manufacturing of the Final design will start. And depending on the success of the campaign and all of the other steps. The rest of the Pledger's will receive their shield
Risks and challenges
The biggest challenge for me is the library, there is one written that works well with this board, but it doesn't have all the features (like external interrupts). The good news it published on github and can be improved by you after the production is done.
All thou the library does not support interrupts the PCB will still have access to INTa an INTB as per documentation in order to future proof.
There are no foreseeable problems with design or manufacturing PCB,Learn about accountability on Kickstarter
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