Force discharge circuit output high at low current consumption.

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Seif_1999
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Posted by Seif_1999: Mon. Feb 22, 2021 - 04:20 PM
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Hi all,
I made an ATmega16 based stop watch and I want it to be power by a battery connected on of those charging, protection and boost modules.
The problem is the circuit draws only about 25mA, however the charging module switches the output off automatically if the output current is less than 50mA.
Maybe I can add a resistor in series with the circuit? But I think this would be a terrible solution.
Thanks

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jgmdesign
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Posted by jgmdesign: Mon. Feb 22, 2021 - 04:30 PM
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You would add the resistor in Parallel.  Not series.

 

What voltage are we talking about?

 

JIm

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Seif_1999
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Posted by Seif_1999: Mon. Feb 22, 2021 - 04:37 PM (Reply to #2)
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The output of the charging module is 5V

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ka7ehk
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Posted by ka7ehk: Mon. Feb 22, 2021 - 04:39 PM
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Can you provide a link for the module? Adding load current will use up the battery faster.

 

Jim

 

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ki0bk
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Posted by ki0bk: Mon. Feb 22, 2021 - 04:42 PM
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Seif_1999 wrote:
ATmega16 based stop watch and I want it to be power by a battery connected

Well a M16 would not be an AVR I would choose for a battery powered device, one of the Pico powered AVR's would be better, such as a Atmega168PA (P = pico power)!

Seif_1999 wrote:
on of those charging, protection and boost modules.

Seif_1999 wrote:
The problem is the circuit draws only about 25mA, however the charging module switches the output off automatically if the output current is less than 50mA.

Your not using an LED display are you?

Post a link to the power module you are using, then a freak can recommend a better alternative or how to modify it for your use.

 

Jim

 

 

 

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Seif_1999
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Posted by Seif_1999: Mon. Feb 22, 2021 - 04:42 PM (Reply to #4)
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https://www.amazon.com/gp/aw/d/B07TKLL42P/ref=sspa_mw_detail_1?ie=UTF8&psc=1&pd_rd_i=B07TKLL42Pp13NParams

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Seif_1999
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Posted by Seif_1999: Mon. Feb 22, 2021 - 04:45 PM (Reply to #5)
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Yup no LED I am using LCD that's why the current consumption is too low.

Maybe use other controller but for now I am settled on the ATmega16

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avrcandies
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Posted by avrcandies: Mon. Feb 22, 2021 - 04:49 PM
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You are trying to use the wrong module....put it aside and get one (there are many) that does not have the auto shutoff for light loads.

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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Seif_1999
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Posted by Seif_1999: Mon. Feb 22, 2021 - 04:58 PM (Reply to #8)
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I tried but I couldn't find any, and I though that all of these modules have this feature
Any way I will try again,thnak you

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