April 27, 2007
about 3 years ago
We produce a similar board - although we include a memory card as well.
However we use an 809 for the reset interface. I’m happy to be proven wrong, but I’m reasonably sure that the WTV020 requires a reset circuit separately (which is what the 809 provides), rather than just a transistor. Despite the fact that Waytronic’s dodgy schematics use a transistor symbol, in fact it’s an 809 that’s used on their boards, not a MMBT2222A or equivalent. The schematics in the datasheet Sparkfun have attached specify an AME8500, another “reset” or supervisory chip, whose purpose is to make sure the main device stays in reset until the power supply is stable.
Yes, it’s mono, powers a speaker directly and while the commands a slightly sluggish, you can get a fair amount of stuff on a 1Gb card.
about 4 years ago
If you have any information you can share on the touch screen protocol, I would be very appreciative.
imharris [at] gmail.com
No public wish lists :(
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