Luke, the Raspberry Pi wiki states that "there are approximately 16 spare GPIOs, which are brought out to 1.27mm pin-strip." There are also 3.3v I2C, I2S and SPI pins available. I'm sure many things can be done with those.
That's why Konstantin is busy with his canBLC: it is using the industrial can bus system, which is a lot more reliable. It's still in development, but I think his quad will fly in the next weeks with it.
I2C is a toy. If you want reliability take a bus designed with industrial strenght in mind.
I2c has not been designed with reliability and robustness in mind. it is primarily a simple protocol and basic hardware interface without galvanic isolation for interfacing Integrated Circuits on PCBs, not more.
I see a lot of talk about I2C esc's and I must say, I think PWM is much better. Take a look at the MK forums, i2c is a delicate interface, there are lots of lockups and having an i2c>pwm converter is pretty much mandatory for any expensive payload, heavy lift systems.
I am also keeping an eye on the Raspberry Pi, a $25 computer based on a Broadcom BCM2835 SoC that could be used for quite a few purposes. It should be on the market next month!
Your latest shipment had left 5 hours ago, sure we could come to some sort of postal agreement :)
Not Looked at the price just yet, the DZ2 stopped it from being stocked in store as I was doing a lot of running about, I will mail you in the morning with some costings.
Comments
Luke, the Raspberry Pi wiki states that "there are approximately 16 spare GPIOs, which are brought out to 1.27mm pin-strip." There are also 3.3v I2C, I2S and SPI pins available. I'm sure many things can be done with those.
That's why Konstantin is busy with his canBLC: it is using the industrial can bus system, which is a lot more reliable. It's still in development, but I think his quad will fly in the next weeks with it.
http://www.xkopter.de/en-us/entwicklung/canblc.aspx
Blog (only german,sorry): http://www.xkopter.de/en-us/entwicklung/canblc/canblcprojectblog.aspx
I2C is a toy. If you want reliability take a bus designed with industrial strenght in mind.
I2c has not been designed with reliability and robustness in mind. it is primarily a simple protocol and basic hardware interface without galvanic isolation for interfacing Integrated Circuits on PCBs, not more.
I would never use that on my frame for ESCs.
@basshead
PWM is unidirectional
with I2C you can get Informations from thes ESC's like powerconsumption or temperature.
You're right that I2C can produce some problem, but with a short busrecovery the communication will be reastablished.
I never had an I2C problem with my MK.
An other point is I2C and STM32F1xx . I think these guys will never bcome friends ;)
I see a lot of talk about I2C esc's and I must say, I think PWM is much better. Take a look at the MK forums, i2c is a delicate interface, there are lots of lockups and having an i2c>pwm converter is pretty much mandatory for any expensive payload, heavy lift systems.
Helldesk, that's an excellent project. Though not really the same purpose since there are no universal I/O pins on the Raspberry Pi board.
I am also keeping an eye on the Raspberry Pi, a $25 computer based on a Broadcom BCM2835 SoC that could be used for quite a few purposes. It should be on the market next month!
Great thing for a reasonable price.
I wonder what's the power consumption (idle, avg, max) with no IO devices attached?
What's the exact weight?
ps: just curious, why not Cortex A9?
Your latest shipment had left 5 hours ago, sure we could come to some sort of postal agreement :)
Not Looked at the price just yet, the DZ2 stopped it from being stocked in store as I was doing a lot of running about, I will mail you in the morning with some costings.
Martin.
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