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Circuit Board v4

A project log for bbot

A 2-wheel balancing robot

Josh ColeJosh Cole 06/03/2021 at 06:420 Comments

After what feels like a lifetime, I've finally received the fourth revision of my circuit board!!! Woohoo! The fab that I've been using is called JLCPCB and they are fantastic. Really cheap and super fast delivery.

Why am I on rev 4, you may ask? Well... some mistakes of the past include:

 - Bore sizes for custom footprints are too small

 - Arduino chip facing inwards, so you can't access the USB port

 - Rogue 12v wire connected to 5v input on the L293D

 - Distinct lack of noise filtering capacitors.

After fixing all those issues, we are left with the glorious piece of engineering you see below. If you look closely, you may notice a number of hacks. That's because, as it turns out, 4th time is NOT the charm. The main mistake I made this time...

 - Capacitors are not supposed to be wired like a switch... How did that even happen!?

That being said, I didn't really need those capacitors anyway. So I just added jumpers which are able to complete the circuit. I'm going to be putting this all together and then we'll see what happens!

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