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#46
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Re: Best gyro for frc.
We'll be providing Java, C++ and Labview on the Roborio, and we also will provide sources for apps in Java (Processing) and C# on a PC.
If you would like to discuss Python development, please contact me at scott@kauailabs.com. You'll need to decide if you want to interface serially (UART/USB), I2C or SPI. |
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#47
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Re: Best gyro for frc.
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Available kickoff? Through andymark? |
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#48
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Re: Best gyro for frc.
Available soon after kickoff. At Andymark. Pricing details to be announced on Jan. 3.
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#49
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Cool, thanks. Out of interest what arm platform are you using (Si Labs, ST etc)? |
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#50
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Re: Best gyro for frc.
STM32F411 @100 MHz; firmware developed in Eclipse C++, debuggable over SWD port with a ST/Link V2 adapter.
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#51
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Re: Best gyro for frc.
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#52
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Re: Best gyro for frc.
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The best way to solve the interference problem is to twist the gyros signal and return cable. The two conductors act like a loop which pick up the magnetic field from your motors. Twisting these two conductors will decrease the effective loop area and greatly reduce the interference. You can prevent common mode interference with a grounded shield on the conductors. Increasing our switching frequency to 15khz makes interferences problems 15 times worse than the 1khz. |
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#53
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Re: Best gyro for frc.
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Not sure I agree there, but that's off-topic. |
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#54
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Re: Best gyro for frc.
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For higher RF frequency, you don't need to have a high permeability to block magnetic fields. I think the 15kHz frequency is in this higher range where it's easy to shield with conductive metals. Quote:
The noise that's induced to the gyro's signal through differential mode interference (meaning your gyro's cable is acting like a loop, picking up the magnetic field) is proportional to the effective loop area, the strength of the magnetic field, and the frequency of the field. Each time the motor's power switches from on to off, faraday's law says that some voltage induced in your gyro's signal. If the event happens 15 times more often per unit of time, you get 15 times more noise. For common mode interference, which is when both your return and signal are affected in the same way, a higher frequency magnetic field will provide more opportunity for parasitic capacitive coupling to ground. However, the higher frequency may be easier to shield from, but I don't think I've ever seen an FRC team use shielded cables for anything before. |
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#55
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Re: Best gyro for frc.
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Thanks in advance. |
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#56
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Re: Best gyro for frc.
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digikey product page Last edited by RyanCahoon : 03-01-2015 at 00:25. |
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#57
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Re: Best gyro for frc.
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#58
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Re: Best gyro for frc.
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The NavX is on Andymark website for $99.00. http://www.andymark.com/product-p/am-3060.htm |
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#59
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Re: Best gyro for frc.
They are currently showing "out of stock". Do you believe that is incorrect, or is it possible that they've sold out already? Will you be able to resupply them "quickly" if that's the case? To me, "quickly" (given that we're at the start of build season) would be within two weeks.
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#60
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Re: Best gyro for frc.
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