The DigiRule is a 15cm (6") interactive binary ruler. Not only does it allow you to draw straight lines - it also has the following built in digital functions:
Seven Logic Gates
- NOT Gate (Inverter)
- OR Gate
- AND Gate
- XOR Gate
- NOR Gate
- NAND Gate
- XNOR Gate
Four Flip Flops
- SR Flip Flop
- JK Flip Flop
- Data Flip Flop
- Toggle Flip Flop
Plus - a four bit binary up/down counter.
The ruler divisions are given in binary format with imperial units at the top and metric at the bottom.
The rear of the ruler shows the truth tables for the logic gates and flip flops and also includes a binary conversion chart, some surface mount component footprints and some PCB drill hole sizes.
So how does it all work?
The digital functions are all controlled by a single PIC microcontroller. You press the gate select button to cycle through the seven logic gates or the flip flop select button to cycle through the flip flops.You can then toggle the input bits to get a result at the output of the selected gate / flip flop. The up / down counter has a button to count up and a button to count down. An on/off switch is provided to save battery power when not in use.
This is my fourth Kickstarter campaign with the last three being successful. I am confident that this campaign will run smoothly and in fact, I am doing all that I can to get delivery to all of you backers by Christmas this year!
What has been completed?
Well, everything about the product is done! I have designed the circuit board, setup a bill of materials, programmed, tested and debugged the code and have a working prototype (as seen in the video and photo's). All that's left to do now is to get backers so that I can get them massed produced - then sent out to backers!
PCB Design - Done!
Microcontroller Code - Done!
- 16 October 15 to 26 October 15 - The Kickstarter campaign will be in progress.
- 26 October 15 to 09 November 15 - Kickstarter will be processing payments from backers.
- 09 November - production will begin.
- Late November / Early December - Packages will be sent out to backers and with all going well, you should get them by Christmas.
Shipping will be through Singapore post via the cheapest airmail option. This is to keep costs down as much as possible for backers. I have used this method for all of my successful Kickstarter campaigns and it has been a reliable service. However it can be a slow service depending on your location. I have had people from previous Kickstarter campaigns receive their backer reward in a about a week from shipment and I have others take up to a month from shipment even though they were sent on the same day, by the same shipping method.
Thanks for taking the time to check out the Kickstarter campaign, if you'd like a DigiRule of your very own, then be sure to put in a pledge and I'll be getting them out to you ASAP!
Please note: Due to postage restrictions on lithium batteries, the CR1220 battery will not be included with each DigiRule. I apologise for this however it is not something that I can change. As such, you will need to purchase a battery locally.
Risks and challenges
I have run numerous successful Kickstarter campaigns over the past couple of years and have been able to fulfil the backer rewards with quite a minimum of fuss. The DigiRule project is very similar to my previous campaigns and since I will be using essentially the same suppliers and manufacturers, I am very confident that this campaign will run smoothly as well.
However challenges do arise such as delays with components and / or pcb manufacture etc... However since I have been working on projects like this since 2007 and have dealt extensively with component and pcb manufacturing companies, along with running numerous successful Kickstarter campaigns, I am confident that if any challenges do arise, I will certainly be able to overcome them to again make this a successful campaign.
Here are my previous campaigns:Learn about accountability on Kickstarter
- (10 days)