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You have not provided your programming language of choice, so I'll answer in pseudocode which can then be adapted to the specific environment. It should be possible with the following construction: …

If I were you I'd use a loop inside the program. In this loop the prompt for entering the code would be displayed, then the user input would be read. Finally, the code would be checked and if correct, …

Please note that I already have a loop encompassing the entire program if the colours are detected in the correct order. How about creating another loop for the failure case? Start loop 1 (corre …

When we did NXT programming in university we used NXC (http://bricxcc.sourceforge.net/nbc/) as our primary language. This is a C-stlye language, not exactly object-oriented, but seeing that NXT progr …

A basic EV3 seems to be enough for most of the basic projects, but you might find yourself in need of a handful of extra parts (gears, beams, etc). The basic kit does not include a gyroscope, but you …

Disclaimer: I have never used the EV3 interface, only the text based programming languages for the NXT. Therefore I might be proven wrong. I need a reliable way to read the gyro sensor readings …

There are a few different but related problems here. Position Your robot should be able to know where it is in the room. This can be achieved in a few ways: Using the ultrasonic sensor as a sonar, …

For a comprehensive enumeration and measurements on all motors, refer to Philo's excellent page on this topic: http://www.philohome.com/motors/motorcomp.htm There are some LEGO motors that are missin …

Could it be that there're parts missing in a LEGO box? Rin Rio-Oki has pointed you to the place where you can definitely get replacement parts, but to answer your first question, yes, it is indee …

The amperage drawn by any motor depends on the voltage supplied and the resistance (load) on the axle. Even if you provide the motor with more ampers than it could safely take, it will only consume as …

Is the documentation (either official or unofficial) of the programming "language" for the LEGO Mindstorms Robot Inventor software available somewhere? … (I have looked at the official LEGO site for the Mindstorms product line, but found nothing there) To elaborate, I'm looking for a resource detailing the available commands, their possible parameters, …

According to this article, the turning is supposed to function via a wheel on the bottom that while the car moves forward stays straight but that once the car moves backward moves a little to the …

This seems pretty much bordering on the impossible, given the current state of (LEGO) engineering capabilities. What you are describing is a Von Neumann Machine and as far as I know nobody succeeded i …

Are you programming your robot to move? If so, then you could just keep a running log in your code of how far did each of the motors turn. Based on this log you could replay the whole log backwards to …

The "forward" and "backward" expressions are only interpreted in the reference frames of the motors themselves and translate to clockwise and counter-clockwise. In your case you must have mounted the …