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Please use this tag only for general Mindstorms questions and compatibility. If the question refers specifically to the EV3, NXT, or RCX, then use those tags instead.

1 vote

Robot that searches for lights

In pseudocode: LoopBlock (forever) MoveBlock (B and C motors, 75% power, forward, forever) -- unclear here, probably want to head for brighter light -- instead, just wait for 80% If L …
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2 votes

System.ArgumentException: Only Sequence Wires can be snapped

*.ev3 project files are zip files that contain a bunch of files. Using a copy of the original project file you might be able to edit the zip file and throw out a file at a time to see if the project …
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2 votes
2 answers
5k views

Is there a fix for an NXT reporting "File error!" when running an EV3 program?

I downloaded the new EV3 software from Lego and installed it on Windows 7. The EV3 software runs. I plugged in an NXT using a USB cable. EV3 can edit the memory on the NXT and remove programs/sound …
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4 votes
Accepted

Is there a fix for an NXT reporting "File error!" when running an EV3 program?

I needed to update the firmware. 1.05 was too old. 1.31 works. Download from: http://mindstorms.lego.com/en-us/support/files/default.aspx#Firmware I did need to run the old NXT-G software to downloa …
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3 votes

How do I update my NXT firmware using EV3 software

EV3 software will not download firmware to the NXT brick. For that you need the NXT-G software and a downloaded firmware file from Lego. 1.31 is the latest version. So if you're running EV3 on NXT, …
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5 votes

Compatibility EV3 software with NXT brick - known limits?

EV3 has no support for the Light Sensor, just the Color sensor. There is a Raw Sensor that can be used to create a Light Sensor MyBlock. That MyBlock can then be used to create the various WaitFor, …
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0 votes
Accepted

Good EV3 iBook for programming or building

First answer is google: FLL EV3 PDF EV3 and PDF are obvious. FLL is short for FIRST Lego League, which may or may not be for "playing field style robots". Clinics for coaches and kids at HighTechKids. …
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5 votes

Are NXT Light sensors compatible with EV3?

NXT Color Sensors are supported directly by EV3-G, the EV3 software running on the PC or MAC. NXT Light Sensors are not. To use Light sensors requires a bit of trickery. EV3-G has a Raw Sensor block …
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1 vote

LEGO Mindstorms Motor Power

The motor speed is controlled by time modulating the available voltage (approximately 9 volts). So at 100% it looks like a continuous 9 volts. At 50% it is periods of 9 volts and 0 volts in equal am …
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1 vote

Multiple Programming Blocks Running at Same Time

The final block in the sequence is telling motor D to rotate 1 revolution at 75% power. In the description of the problem, it says "and Large Motor was plugged into A." Any chance that is the bug? Put …
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3 votes

Code for PID for EV3-g

This is EV3-G code for a PID based on PID Controller for Lego Mindstorms Robots by J Sluka. It uses the steering parameter of the Move block instead of power levels of the Motor block. …
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1 vote

How can I use multiple switch options in Lego Mindstorms EV3 software?

Yes, multiple switch statements can be nested inside each other. However, given the problem of a measuring a motor's rotation and converting that into a user choice doing the math first and using tha …
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0 votes

Is it possible to retrive a text file from an NXT?

This is not an answer, just an answer to the @laurentien comment posted in the existing answer. The "NXT window" icon is the orange L-shaped button (see red arrow). The "memory" tab is the other r …
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4 votes
3 answers
3k views

What is a normal range of reading of the Light Sensor using EV3 Raw Sensor block?

EV3 software does not support the Light Sensor. It does support the Color Sensor. The solution is to use the Raw Sensor Block. What is "normal" for raw sensor block readings? I'm getting readings b …
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2 votes

How to program two NXT motors to run at the same time?

It depends on the programming language, but assuming you're using NXT-G then the Move block may be sufficient. The Move block is designed to coordinate 2 motors so that they both rotate at the same s …
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