HiTechnic IR RC Kart Sample Model

The HiTechnic IR RC Kart features the HiTechnic IR Receiver sensor. This sensor allows you to create NXT models that are controlled with a LEGO Power Functions Remote.

This model is buildable with either a LEGO Mindstorms 1.0 or 2.0 set. The building instructions show 2.0 part colors and wheels but otherwise uses only parts available in both sets.

This model also features the new HiTechnic Motor PID Block. The block makes it easy to have an NXT motor drive to a specific angle position. In this model the HT Motor PID block is used to control the steering motor. The block is used twice in the program, first it is used to initialize the steering motor by having it drive to both the left and right mechanical limits and then setting the zero position is the point in between these limits. Then inside the loop the desired steering angle is determined by the IRReceiver and then value is passed to the Set Point of the Motor PID Block.

Building Instructions and Programs can be downloaded from www.hitechnic.com/models. The IRReceiver and the Motor PID blocks can be downloaded from www.hitechnic.com/downloads.

Category:

Howto & Style

Tags:

• HiTechnic
• IRReceiver
• IR
• RC
• Car
• Kart

[Dolmori]

i have the mindstorms nxt 1.0 program and the ir reciever block doesn't work; the motors work for a split second and don't work again until 3 seconds later, like

-_ _ _-_ _ _-_ _ _-_ _ _-

(-) =working, (_) =dead time.

[hitechnic]

@Dolmori First of all, the best way to contact us is via the online support form on our website.

This may be caused by IR interference or it may be something wrong with either the HiTechnic IR Receiver or the LEGO PF Remote. I suggest you test this in different locations to see if you can reduce possible IR interference. You may also try replacing the batteries in the LEGO PF remote. If nothing helps, please contact us via the online form se we can get this resolved.

[Dolmori]

@hitechnic thank you! i tried everywhere but the signal is still the same. so i think theres something wrong with the remote or reciever and ill be visiting your website too.

[hitechnic]

@Dolmori The problem is that the old LEGO firmware does not handle digital I2C sensors correctly. The solution is to upgrade to the latest LEGO firmware. - Thank you @Dolmori for discovering this.

[HaydenStudios]

@hitechnic Thank you for replying, I have now been able to synthesize my own wires thanks to your guidance!

[hitechnic]

@hitechnic The problem is almost certainly caused by the old LEGO firmware. The program and block will work with the 1.0 software but you do need to have at least version 1.05 of the firmware. Google LEGO NXT Firmware to find the latest firmware from LEGO.

[hitechnic]

@LinkShack The HiTechnic IR Receiver block and the Motor PID block work wiith NXT 1.0 as well as 2.0. Please contact HiTechnic support using the HiTechnic website.

[LinkShack]

I lost my NXT 2.0 disc so I'm stuck with my NXT 1.0 disc and the IR Block worked on 2.0 but not on 1.0

[LinkShack]

no need for a differential gear.