FreQshifter Posted November 20, 2009 Report Share Posted November 20, 2009 (edited) This sensor trackball looks pretty cool. similar to a xy pad (which i can't seem to find on the internet) http://www.sparkfun.com/commerce/product_info.php?products_id=9320 What board do i connect this too, ain, din? if it works, can i multiplex these? and also i looked at the Schematics and I dont know what is BTN on the pcb board?? any help would be great... Edited November 20, 2009 by FreQshifter Quote Link to comment Share on other sites More sharing options...
Screaming_Rabbit Posted November 21, 2009 Report Share Posted November 21, 2009 and also i looked at the Schematics and I dont know what is BTN on the pcb board?? Read! :blink: ... From the link you posted: "...An SMD momentary switch is placed under the trackball to give you a select switch. The BTN line will be pulled low when the switch is pressed..." How it works...? From the Hall-Sensor datasheet: "...AN48841B Low current consumption, high sensitivity CMOS Hall IC Operates on Alternating Magnetic Field (low-speed rotation for lock detection)..." -> it seems to switch high/low on change of the sensed polarity. But I don't understand how it can tell you about the direction. - Assumed, the paired magnets have exactly the same polarity position (can be, since they can "freely spin", they are not "locked" to each other), how could you find out the direction? I think you have to buy one, connect it to an oscilloscope and try to find out more. Greets, Roger PS: Connect to DIN Quote Link to comment Share on other sites More sharing options...
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