Hall Effect Sensor.

[jimsmith2354]

Originally Posted by Leav

Has anyone had any luck with mounting the hall effect sensors?

i haven't found anything that fits them.......

also, if you haven't read the manual it states that you must connect pin 4 to pin 3 externally.

-Leav

Mounting of the Hall Effect sensors - We have drilled out the inside of two small connector housings, sanded off the middle ring on the outside, and will use jam nuts to hold them onto brackets placed near either the output gear or a tone wheel.

From another post, connect to controller using a PWM cable - RED to Pin1 - WHT to Pin2 - BLK to Pins 3 & 4

We will wire, test, then epoxy them into these homemade housings.

Mouser PNs 571-14454211 (x2) and 571-16041961 (x4)

Good Luck,
Jim

[MyFeetHurt]

Hey, Stu, it's Christine. I did some calculations.

Wheel radius = 4", Robot speed = 10 ft/sec, gear by sensor has 45 teeth

2 * pi * 4" / revolution

* 1 revolution / 45 teeth

* 1 sec / 120 "

* 1000 mSec / sec

= 4.65 mSec / tooth

In other words, you can't do this by polling the sensors in a 26 mSec cycle, and you probably can't do it in the fast cycle either.

I think the right way to do this is to hook the sensors to a digital counter and poll the counter. I could be wrong. I don't know squat about counters, it's after midnight, and I can't remember how quickly the fast code cycles.

I won't be there this weekend. See you all Monday.

[Joe Ross]

You can get very similar Hall effect sensors from Newark (they are actually just the next version newer, ATS665LSGTN) for $5. So, teams shouldn't limit themselves to just the two in the kit if they want more. There were 762 in stock when I posted this.