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Richard

Member Since 04 Oct 2010
Offline Last Active Jul 13 2014 06:43 AM
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Posts I've Made

In Topic: Driving more RC servos than you have PWM outputs

14 October 2010 - 05:25 AM

Would this depend on whether you were doing full phase accurate PWM? For servos though, we don't actually really care about that sort of thing. All we care about is 1uS accuracy on the pulse width, delay between pulses could be pretty random and from 2.5ms to 20ms. Is there any chance of getting some advance look at the code you are putting together for this?

In Topic: Driving more RC servos than you have PWM outputs

14 October 2010 - 04:50 AM

Hari,

We have a "software PWM" feature planned for a future firmware update. It would basically use a timer interrupt in the background to allow you to run one or two additional PWM channels. This would also give Netduino 100% pinout compatibility with Arduino shields.

Chris


Will this be limited to 1 or 2 extras or will it allow you to run pulse accurate PWM for every digital pin?

In Topic: Driving more RC servos than you have PWM outputs

12 October 2010 - 10:19 PM

The servo shield is basically a variation on option 2 I guess. The AVRs that are being used in those shields do not have 16 PWM outputs so they must be generating the appropriate waveforms on-chip, unless those little SMDs are SPI PWM generators or something. There are a bunch of PIC based boards that generate their own waveforms as well. I guess I was interested in pushing the existing hardware as far as it can be pushed rather than adding peripherals.

In Topic: Compatible Shields and Accessories

09 October 2010 - 12:26 AM

While I have not tried the PoE functions, I have the Freetronics ethernet shield (http://www.freetroni...shield-with-poe) and it works perfectly with the SecretLabs experimental drivers. Not a bad bit of hardware at all :-)

PoE?!? That's pretty cool. It will probably work (although it never hurts to double-check with the vendor to make sure they support incoming 3.3V signals).

Chris


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