We are developing a product where:
- a child holds an electronic stylus
- she uses it in conjunction with a book that has multiple choice questions
- when she touches the right answer, the stylus will give positive feedback
- when she touches the wrong answer, the stylus will give appropriate feedback
The way that we currently have implemented this is using conductive ink (black) and a conductivity sensor on the tip of the stylus. We already have a line of products based on this system.
The CORRECT answer has a 1/4" black dot next to it (printed with conductive ink). The WRONG answer has a 1/4" black dot next to it (printed with normal ink).
THE CHALLENGE: - we're making a new system for younger kids - questions have PICTURE multiple choice answers (b/c younger kids want to touch the stylus to the PICTURE and not the black dot) - we want the printing technology to not obstruct the picture
Any ideas on a system here? We're aware of the Leapfrog stylus that reads a small pattern of dots on a page. This technology is too expensive for us.
I'm looking for a list of technologies to investigate for on/off, true/false detection.