2009:Mouse details: Difference between revisions
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<u>USB Ball Mouse</u> - | <u>USB Ball Mouse</u> - | ||
power from PC to mouse is +5vdc. | |||
Pulse Rate = 5 micro second (top two lines) | Pulse Rate = 5 micro second (top two lines) | ||
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1/200uS = 5000cycles/sec - - - this is the maximum detectable rate | 1/200uS = 5000cycles/sec - - - this is the maximum detectable rate | ||
sensor wheel = 60 counts per revolution (CPR) | sensor wheel = 60 counts per revolution (CPR) | ||
Calculate maximum detectable ground speed: | Calculate maximum detectable ground speed: | ||
5000cps/60CPR = 83.3 max revolutions per second (rps) | |||
<span style="color: rgb(255, 0, 0);">diameter</span> of mouse ball = 0.875" | |||
circumference of mouse ball = Pi * d = 2.7489" circumference | |||
| <span style="color: rgb(255, 0, 0);">measured counts per foot on current mouse on robot - 1210, or ~100 counts per inch</span> | ||
| 83.3rps X 0.875" = 72.9 inches per second (ips) | ||
| 72.9ips/12 = 6.07 feet per second (fps) = maximum detectable linear ground speed | ||
| 6.07fps = 4.1 miles per hour (just in case you were curious) | ||
<br> | |||
It appears the phototransistor may be an "EverLight" Device... Check out something "[http://www.everlight.com/upload/product_pdf/PT2559B-L2-F_1789.pdf similar]". | |||
<br> | |||
<u>PS/2 Ball Mouse -</u> | <u>PS/2 Ball Mouse -</u> | ||
<u>USB Optical Mouse -</u> | <u>USB Optical Mouse -</u> | ||
Latest revision as of 20:32, 30 December 2009
USB Ball Mouse -
power from PC to mouse is +5vdc.
Pulse Rate = 5 micro second (top two lines)
Long Pulse--->Long Pulse = 200 micro seconds (bottom length)
Image:Pulse lengths
1/200uS = 5000cycles/sec - - - this is the maximum detectable rate
sensor wheel = 60 counts per revolution (CPR)
Calculate maximum detectable ground speed:
5000cps/60CPR = 83.3 max revolutions per second (rps)
diameter of mouse ball = 0.875"
circumference of mouse ball = Pi * d = 2.7489" circumference
measured counts per foot on current mouse on robot - 1210, or ~100 counts per inch
83.3rps X 0.875" = 72.9 inches per second (ips)
72.9ips/12 = 6.07 feet per second (fps) = maximum detectable linear ground speed
6.07fps = 4.1 miles per hour (just in case you were curious)
It appears the phototransistor may be an "EverLight" Device... Check out something "similar".
PS/2 Ball Mouse -
USB Optical Mouse -
