Bluetooth Watch. Options

[Ferret-Simpson]

if it can use palmorb then i am intrested, bluetooth would be a killer app for this thing as then i could hook it into my sysetm and see if i can make my Z pull the phone number from the phone and disploy on the watch then route the audio to my bluetooth headset smile.gif, all we need is a serial port i guess wink.gif

now where can i ind one of these in Australia?

Hmmm. . . Dismantled mine today, just to prod, and discovered something. The IRDA chip (2mmx10mmx2mm) has 8 pins on the back, and a larger pin holding it down. So looks like you could steal a serial port from the IRDA. However, you have a total of 1cmx0.5cmx0.2cm space internally to fit a bluetooth module, although you could hang it of the hole (full of translucent plastic) for the IRDA beam, which is about 2mmx12mm square.

http://www.ratesaver.com.au/products/B0007...OS___Black.html

Don't know if that link's any good?

Even just as it is, it's a cool, and useful device. (Just a shame about the 1 to 2 day battery life. Ah hell, who cares, you can charge it from a USB port!)

[Da_Blitz]

Why do we need a sound chip when we can use one IO pin and do a BTC thingy (http://www.romanblack.com/picsound.htm) it uses over sampling to get better sound quality or bump it up to 2 io pins, of course we will need a darlington array to protect the IO pins but thats easy to do and means a SMD chip can be replaced with 2 transistors and a cap/resitor

i dont think it could boot from SD however it would be posible to boot strap the thing from flash onto NFS over bluetooth or mini SD. good point about the power, at this size every chip i can iump will be required, that said prhaps we should get one with on board flash as this would give us a bit in the way of power saving

if we are willing to drop usb host and only have usb client (firmware updating and charging) then the iMX chip looks better, it only goes up to 100Mhz but it has everything we need including SPI which we can use to talk to the miniSD card (one bit @ 25Mhz max = 25Mbit)

i assume the "APU" is an 8 bit micro to control everything, if it is i would rather drop it and spend the extra 1ma somewhere else. the camera for expmle will be the highest on my list of things to drop as they are more power hungry than most people relise, but thats only if we run out of room

we need to work out case size and what type of battery will power this thing, that gives me a rough power budget to work with and means i should be able to tell you how long it will run under full load and how long when its idle

the accelerometer or a tilt senseor can be used to save power by turning everything off except when you are looking at it