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Re: NXT: How to use external power supply for non-LEGO-sensors?

Yes. Connect battery GND, sensor GND, and NXT GND (pins 2 and 3), just like in that last picture.
by mattallen37
25 Mar 2014, 04:19
 
Forum: Robot Building
Topic: NXT: How to use external power supply for non-LEGO-sensors?
Replies: 5
Views: 3619

Re: NXT: How to use external power supply for non-LEGO-sensors?

Make sure the NXT, sensors, and battery all have a common Gnd (very important!). Make sure the lipo output voltage is correct. Is the lipo a single 3.7v cell? two cells in series? is it regulated at 5v? I'm not sure about those sensors, but the NXT I2C bus would be fine with 3.3 - 5v (probably 2.5v ...
by mattallen37
23 Mar 2014, 12:11
 
Forum: Robot Building
Topic: NXT: How to use external power supply for non-LEGO-sensors?
Replies: 5
Views: 3619

Re: Controlling RCX with Windows 7 PC

It would be my guess that Robolab installed whatever drivers are necessary. I can't guarantee anything about those drivers I uploaded. I just had them sitting in a folder on my computer from my days of trying to get the RCX to work using the Lego USB IR Tower (which I gave up on, and then designed m...
by mattallen37
07 Mar 2014, 00:07
 
Forum: Mindstorms Software
Topic: Controlling RCX with Windows 7 PC
Replies: 18
Views: 8211

Re: Controlling RCX with Windows 7 PC

Were you talking to me? What I uploaded was just some drivers that I had previously found on the internet. Like Xander was saying, the RCX is a very old system that hasn't been supported by Lego for quite a number of years. I'm also fairly certain that Lego won't mind if the community shares the ISOs.
by mattallen37
06 Mar 2014, 20:59
 
Forum: Mindstorms Software
Topic: Controlling RCX with Windows 7 PC
Replies: 18
Views: 8211

Re: Controlling RCX with Windows 7 PC

If you are running 32 bit Windows 7, then the USB tower should work fine. You will need the drivers though. I was looking on my computer, and I found two things that look like the Lego RCX USB IR Tower drivers. I've uploaded them both to this post. You could try either (or both) to see if it makes a...
by mattallen37
06 Mar 2014, 17:23
 
Forum: Mindstorms Software
Topic: Controlling RCX with Windows 7 PC
Replies: 18
Views: 8211

Re: Raspberry Pi Camera with Replacable Lens

The camera board itself doesn't support image processing, but you can use the RPi to process the information. For movement detection, there's a program called "motion" (I think it's specifically for the RPi) that you could look into using. You could probably find more specific helpful info...
by mattallen37
07 Jan 2014, 22:43
 
Forum: BrickPi
Topic: Raspberry Pi Camera with Replacable Lens
Replies: 8
Views: 4633

Re: Recharging BrickPi batteries through RPi?

The BrickPi doesn't really have a 5V plug, and the RPi doesn't have a 9V plug. The BrickPi has 9V input, and the 5V output goes to the RPi through the 2x13 header. The RPi can be powered through the 2x13 header, or through the uUSB jack. If you have the BrickPi connected to the RPi, and you power th...
by mattallen37
29 Oct 2013, 05:27
 
Forum: BrickPi
Topic: Recharging BrickPi batteries through RPi?
Replies: 1
Views: 1909

BrickPi Information

This is a list of information about the BrickPi, and how to use it. It will likely be modified and added to in the future. Terms Explained "RPi" means "Raspberry Pi" "RPi A" means "Raspberry Pi Model A" "RPi B" means "Raspberry Pi Model B"...
by mattallen37
20 Oct 2013, 00:35
 
Forum: BrickPi
Topic: BrickPi Information
Replies: 0
Views: 2167

Re: Lego vs Microinfinity Gyro Comparison

I was just using commercial products to point out that you can't expect a $30 toy to be perfectly accurate. The HT gyro is completely analog. The bias is susceptible to power supply voltage changes (like when you run a motor). Being analog, it is limited to the 10-bit ADC of the AtMega48 co-processo...
by mattallen37
18 Oct 2013, 15:55
 
Forum: Mindstorms Hardware
Topic: Lego vs Microinfinity Gyro Comparison
Replies: 13
Views: 5166

Re: Lego vs Microinfinity Gyro Comparison

In the USA, the Gyro sensor costs $29.95 (equivalent to 21.90 EUR according to Google). Compared to several hundred to several thousand dollars (or more) for a "real" gyro (e.g. the ones used in aircraft), $30 is a cheap toy that I wouldn't expect a whole lot from. We are all entitled to o...
by mattallen37
18 Oct 2013, 15:20
 
Forum: Mindstorms Hardware
Topic: Lego vs Microinfinity Gyro Comparison
Replies: 13
Views: 5166
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