Andy's Postbag and random ebay links

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ahull
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Re: Andy's Postbag and random ebay links

Post by ahull » Wed Jun 14, 2017 12:52 pm

Image

There are three flat pack chips on the JJRC HC20 board, according to the images I can find of it online, but I'm not sure what they all are. Presumably one is a gyro, perhaps one is flash or more likely the radio and one, the microcontroller.

BTW the board is available as a spare part, for not much... so you might be able to build your own hexacopter with that as the brain, using those little SMT transistor to drive large mosfets and big beefy motors.

http://www.ebay.co.uk/itm/JJRC-H20-Rece ... Swax5YpXAu

Image

https://www.ebay.co.uk/sch/i.html?_from ... 20&_sop=15

EDIT: .. and of course there is no shortage of candidates for the 32 pin mcu, ST has a whole bunch of Arm chips in that form factor, so we could get lucky, it may well be one of those.
- Andy Hull -

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zoomx
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Re: Andy's Postbag and random ebay links

Post by zoomx » Wed Jun 14, 2017 2:30 pm

Andy,
you're right!
https://blog.banggood.com/hexa-flying-w ... 30950.html
The smaller chip is an XN297, it is a radio chip used in wireless mice
http://www.panchip.com/en/products_show ... =70&id=351
datasheet herehttp://opendevices.ru/wp-content/upload ... ceiver.pdf
Then there is a 6050 MPU and a Chomp ZC-4J01 :shock:
The latter chip is a mystery (or an error in the page?) but I found several version of the same board. Mine hasn't the little switch near the battery socket

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ahull
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Re: Andy's Postbag and random ebay links

Post by ahull » Wed Jun 14, 2017 3:05 pm

"Chomp ZC-4J01" will be an in house designator for an off the shelf MCU with their in house developed firmware I suspect. Given the task, and the low cost nature of ARM boards, I suspect an ARM is the most likely... and given that there is already open source software for STM32XXX based quads and hexacopters, I think it is probably an STM32 or GDM32 of some description. I could of course be entirely wrong.
- Andy Hull -

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