vbat connection solution ?

The official pyboard running MicroPython.
This is the reference design and main target board for MicroPython.
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Target audience: Users with a pyboard.
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IHOXOHI
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vbat connection solution ?

Post by IHOXOHI » Thu Jun 11, 2020 10:53 am

Hi,

I use my pretty pyboard with her housing and lcd160. The result is clean. I can connect properly serverals sensors on Y part without ugly wire. It's perfect. Beautiful and convenient.
But, I need to use vbat for saving time, and I have found a big problem for connect a coin cell properly.

I have tried to solder 2 connections under the board for connect a coin cell althoug the result will produce 2 ugly wires... and a "flying coin cell" like a flying sheet... But I did not succeed. The solder does not take on this points!

If somebody has a solution for a clean connection between a coin cell and the pyboard with a housing, or an other way for save time?

Thanks.

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pythoncoder
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Re: vbat connection solution ?

Post by pythoncoder » Sat Jun 13, 2020 12:58 pm

Why not run the LCD160CR on the X side? This exposes the socket contacts for the battery so it can plug in normally.
Peter Hinch

IHOXOHI
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Re: vbat connection solution ?

Post by IHOXOHI » Sun Jun 14, 2020 10:07 pm

Hi Pyth,

I use the pyboard with her housing... So, X or Y position produce same result.

I can pass 2 littles wires by bottom of housing. But result isn't convenient... with a "flying" coin cell.

I will try to solder directly a coin cell "breakout" under the board, ... space could accept a coin cell...

I will post the result...

IHOXOHI
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Re: vbat connection solution ?

Post by IHOXOHI » Sat Jun 20, 2020 5:55 pm

Hi,

I have done it.
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Nothing outside the housing! Just on top, the lcd160 and one of my different "half protoskin"... Perfect.

IHOXOHI
Posts: 106
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Re: vbat connection solution ?

Post by IHOXOHI » Wed Jun 24, 2020 7:26 am

Hi,

Big problem!

The coin cell is out in less than 24 hours...

Is it the vback pinout that I have to use?
Otherwise, no way for save time!

Thanks.

chuckbook
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Re: vbat connection solution ?

Post by chuckbook » Wed Jun 24, 2020 10:23 am

The VBACK pin has to be used for RTC backup.

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Re: vbat connection solution ?

Post by pythoncoder » Wed Jun 24, 2020 10:49 am

Yes. On Pyboard 1.1 VBAT powers the entire Pyboard and is intended for lithium batteries. See this diagram.
Peter Hinch

IHOXOHI
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Re: vbat connection solution ?

Post by IHOXOHI » Thu Jun 25, 2020 12:08 am

Ok, thanks.

I have found a solution there : https://elfnor.com/pyboard-datalogger.html
So, coincell-gnd on the pin upper X24, and coincell-V+ on the pin upper X22.
I have tested, and for moment it's all right.

Enjoy.

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