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Topic: Picaxe 08M2 development board (Read 390 times) previous topic - next topic

Isaac100

I have been working on designing a development board based on the Picaxe 08M2 (A relatively basic mcu).  I am pretty new to designing the types of circuits for a board like this(so I probably made some mistakes), and was wondering if someone could go over my schematic for mistakes which is here: https://easyeda.com/1508543/picaxe

Thanks in advance!

spycatcher2k

Quote
I have been working on designing a development board based on the Picaxe 08M2
But you decide to ask in the ARDUINO forum for help?  :(

Mrs Drew
-=-
http://www.uk-pcb.co.uk - UK PCB Fab Company
I will design & code for you, but I will also charge you (PM me)
If you don't like my answers, realize : I'm not being cheeky, I'm Just trying to prompt you to use your own brain/google etc.

Isaac100

But you decide to ask in the ARDUINO forum for help?  :(


Well, I mean, this is "other" hardware development, isn't it?

westfw

IMO, your power traces should be thicker and the traces "further apart" (especially near P2)
You are missing bypass caps for each chip that are "recommended" (one or more per chip.)  You can probably get away with this on the PICAXE itself, since it's a very small board that has the voltage regulator caps "nearby", but I think that FT232 chip NEEDS a cap on the 3V3OUT pin.
You don't have the usual ferrite bead and 10nf cap recommended for USB bypass (it'll probably work fine anyway), and the 100uF cap on Vcc probably violates USB spec when the jumper is set for power from the USB connector.


spycatcher2k

Quote
Well, I mean, this is "other" hardware development, isn't it?
Other Arduino based hardware. You don't see any other 'PIC' posts here! do you?

I also give support on various PIC forums, and don't see a similar post their.!
Mrs Drew
-=-
http://www.uk-pcb.co.uk - UK PCB Fab Company
I will design & code for you, but I will also charge you (PM me)
If you don't like my answers, realize : I'm not being cheeky, I'm Just trying to prompt you to use your own brain/google etc.

Isaac100

IMO, your power traces should be thicker and the traces "further apart" (especially near P2)
You are missing bypass caps for each chip that are "recommended" (one or more per chip.)  You can probably get away with this on the PICAXE itself, since it's a very small board that has the voltage regulator caps "nearby", but I think that FT232 chip NEEDS a cap on the 3V3OUT pin.
You don't have the usual ferrite bead and 10nf cap recommended for USB bypass (it'll probably work fine anyway), and the 100uF cap on Vcc probably violates USB spec when the jumper is set for power from the USB connector.


Thanks! I added most of what you said, and the board looks pretty good.  And I'll make sure to post anything else about this on the Picaxe forums @spycatcher2k !

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