Comments on: EOPD – How to measure distance

By: Gus

Gus — Tue, 08 Nov 2011 16:49:43 +0000

You can’t use the EOPD sensor to measure distance as easily as the Ultrasonic sensor so I’m not sure if a driver or an NXT-G block will be the solution. If you are programming in NXT-G, then you really only need one math block together with the EOPD block to estimate distance. Put the math block after the EOPD block and pass in the Processed value from the EOPD block to the B input on the math block. Now set the math block to divide and put a constant in the A field. The amount of the constant will depend on the surface you are measure distance to so it will require some experimenting. Start with something like 1000 and see what you get. Write a program that displays this result on the NXT screen so you can easily see what you get for different distances.

By: GSRobo

GSRobo — Tue, 08 Nov 2011 15:01:25 +0000

Hi I’ve got a problem because I dont Understand this programm. Can you make a Library so I can use it like a Ultrasonic Sensor ! Please
Love this sensors, they are better than these other seonsors from LEGO NXT. But what if i cant use them because im a Big idiot!
Thanks if you help me !

LG GSRobo

By: Vladimir

Vladimir — Sat, 12 Mar 2011 15:06:15 +0000

Thanks a lot!

By: Gus

Gus — Sat, 12 Mar 2011 14:51:03 +0000

Your NXT does support the latest LEGO firmware. You can download from here:
Mindstorms.LEGO.com
You can use either the LEGO Mindstorms software or something like BricxCC to download the firmware to your NXT.

Even though this firmware supports floating point math, the LEGO Mindstorms 1.0 software does not. To use floating point math in your program you will either need to upgrade to the 2.0 LEGO Mindstorms software or switch to NXC.

By: Vladimir

Vladimir — Sat, 12 Mar 2011 10:55:45 +0000

Hi! I have NXT with firmware 1.05, how I can use float type in it? The firmware 1.29 isn’t work in my brick..
Thanks!

By: steffan

steffan — Fri, 25 Jun 2010 19:38:25 +0000

ya just figured that out. before i downloaded the sensor block it kept showing up as a my block sorry.

By: Gus

Gus — Fri, 25 Jun 2010 17:50:14 +0000

Steffan, that is not a MyBlock. You need to download and install the EOPD sensor block from the HiTechnic downloads page. The EOPD sensor block gives you the processed as well as the raw output and lets you set the range.

By: steffan

steffan — Fri, 25 Jun 2010 17:24:38 +0000

I think i understand how the sensor works but im not sure how exaclty to program the EOPD sensor block that will allow me to use the sensor. I see in your programs you have the myblock but i would like to learn how to program it myself. it would be great if you could help.

By: Measuring Distance With the EOPD « I'd Rather Be Building Robots

Measuring Distance With the EOPD « I'd Rather Be Building Robots — Fri, 30 Apr 2010 17:52:06 +0000

[...] Filed under: Uncategorized — Xander @ 18:51 Gus Jansson of HiTechnic has written a nice article on how to use the HiTechnic EOPD sensor as a distance measuring [...]