2 Itsy Bitsy boards In serial connection.

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K212
 
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Joined: Wed May 18, 2022 11:42 am

2 Itsy Bitsy boards In serial connection.

Post by K212 »

Hi,

I have 2 Itsy Bitsy boards (5V variant), see link
https://learn.adafruit.com/introducting ... u4/pinouts

I want to connect them in serial and have one of the boards polering the other.
Most pins are easy,
GND1 to GND2,
RX1 to TX2,
TX1 to RX2,
But I don't know how to connect the power pins.
Do I connect the 5V on both boards? On the page above it says output, which suggests it shouldn't be used as input... there seems to be no clear Vin pin...

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dastels
 
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Re: 2 Itsy Bitsy boards In serial connection.

Post by dastels »

How far apart are they? They can have their separate/independent power supplies, either battery or USB, as long as ground is connected between boards (which is required anyway for serial to work). There's a protection diode on the USB 5v line so you could connect the 5v pins together. Even so I would want to disconnect the 5v pin on the powered board before connection USB. To be extra cautious you could wire the 5v from one board (the one doing the powering) to the 5v of a micro USB connector https://www.adafruit.com/product/1390 and power the second board through it's USB connector. Everyone is happy and there's no chance of power mishaps.

Dave

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K212
 
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Re: 2 Itsy Bitsy boards In serial connection.

Post by K212 »

Ok, thanks!

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