External LED

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Cairoli
Posts: 8
Joined: Fri Jan 18, 2019 8:29 am

Wed Aug 21, 2019 1:57 pm

Hello Everyone,

Did anyone understand how to replicate the blinking of the PWR Led with an external Led exploiting the LattePanda Pins? I saw something with the S0 Pin, but it is always 5V.

Thank you very much,

Regards,

Giovanni

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ccs_hello
Posts: 439
Joined: Sat Oct 13, 2018 9:16 pm

Wed Aug 21, 2019 2:41 pm

re: showing LP Alpha's power state (actually CPU state)

S5 state is more useful.

See my S5 state write-up:
https://www.lattepanda.com/topic-f23t18595.html

P.S. I recommend using a driver to drive the LED, S5 pin is just a status signal.

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Cairoli
Posts: 8
Joined: Fri Jan 18, 2019 8:29 am

Thu Aug 22, 2019 3:08 pm

Hi,

Thank you very much for your answer.

Could you please suggest me the best way to drive the LED?

Thank you,

Regards,

Giovanni

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ccs_hello
Posts: 439
Joined: Sat Oct 13, 2018 9:16 pm

Fri Aug 23, 2019 5:59 am

Since S5 lead will be 5V (operational) and 0V (not in S5 state), this probably is a buffered signal, not directly from Intel CPU (which will be 1.8V or 3.3V.)
I think it is worthwhile asking LattePanda engineers to clarify (its LED driving capability, say if 10mA is doable or not?)

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Cairoli
Posts: 8
Joined: Fri Jan 18, 2019 8:29 am

Mon Sep 02, 2019 1:24 pm

Thank you very much

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