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There have been 153 items by Stefan W. (Search limited from 28-April 23)

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#14957 Building a small lego robot

Posted by Stefan W. on 03 July 2011 - 12:44 AM in Netduino 2 (and Netduino 1)

Just a question Stefan W...
What kind of motors are you using with the lego? the originals ones?
If so, how do you solved the wiring of them (the plain special connectors I mean)?
Cheers

I did not yet, but I planned on cutting a lego cable open (i have a damaged one anyway) and soldering it to hookup wire. When i'm done, i'll report on how it worked out - and yes, original lego motors (the ones that i have now are the old ungeared ones, i ordered some newer ones from ebay).

#14862 Building a small lego robot

Posted by Stefan W. on 28 June 2011 - 10:14 PM in Netduino 2 (and Netduino 1)

Hi Stefan,

You can supply 7.5V-12VDC to the VIN pin, unregulated. A 9V battery will work fine. In fact, we do that frequently with the Netduino Minis.

As for startup--the pins are set as inputs with pull-ups enabled by the micro at boot. This may cause attached devices to see a bit of a "logic high" during boot, but you should haven't to worry about damaging the Netduino itself during boot unless you're trying to draw/supply large amounts of current.

For your motors and such, your best bet is to use a separate power supply.

Chris

Yes, I planned to use a seperate block of batteries for the motors, using an H-Bridge, i got as much from the web. Thanks to you and Stefan for the information!

#14858 Building a small lego robot

Posted by Stefan W. on 28 June 2011 - 09:16 PM in Netduino 2 (and Netduino 1)

Hi,

I'm pretty new to electronics and microcontrollers, and I've gotten a netduino because I wanted to get into this topic, and so after a few starting excercises (like blinking leds, using shift registers with SPI, using LDRs as sensors and so on) I think about setting off to my first "real" project: a small lego robot (built with old parts that I used to play with a long time ago

). There are, at this moment, two things unclear to me yet though, so if anybody could clear those up for me that would be great:

I'm going to run this robot on batteries, and i'm wondering if directly plugging in a 9v battery to Vin/Ground (maybe with a rectifying diode to prevent wrong polarization) will be fine, or if i need a supply with a regulated voltage (which would probably need a bigger voltage on the battery, which i'd like to avoid - i'm already going to have to use 8 AA batteries to power the motors).
In which state are the netduino pins when the netduino turns on? Or, to be more direct: Can I damage the netduino when I connect a pin to the netduinos 3.3V on startup? (If it's going to be used as an input with ResistorMode.PullUp later).

Thanks for your help, and for a great product