Arduino changes from 2GB/32GB LattePanda boards?

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Posts: 25
Joined: Tue Sep 12, 2017 3:42 pm

Fri Dec 13, 2019 6:59 pm

We have some boards that are a couple of years old.
We have some brand new boards too.

Both are the 2GB/32GB versions with no pre-installed Windows.

We're noticing differences in how the Arduino is dealing with pinouts. On the older version it's working as expected, where we're using a line as an ignition sense. It goes high, it goes low.

On the newer board however that line stays high all of time .

These are straight out of the box.
They're imaged with Win10 LTSB.
Our software (which hasn't changed) pushes a wake-up at 1200 baud to the Arduino, then passes commands to activate a bank of LEDs.
Pretty straightforward stuff.

Does anyone know if there have been any differences in chipsets or default sketches on the Arduino Leonardo's on the 2GB/32GB versions of the LattePanda in the last couple of years?

Any assistance would be appreciated.


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Site Admin
Posts: 47
Joined: Fri Apr 15, 2016 9:21 am

Mon Dec 16, 2019 9:22 am

The arduino haven't been change in chipset or firmware ever.
It's arduino leonardo firmware with standard firmata sketches.
Can you tell me what problem you met ? can you give a detailed description?
That will help to find the problem

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Posts: 25
Joined: Tue Sep 12, 2017 3:42 pm

Mon Dec 16, 2019 2:45 pm

Here are the details from our electrical engineer:

We received 32 Latte Panda 2GB/32GB from Mouser. The serial number stickers are all dated 2019.04.27.
Every single board we’ve tested so far, Arduino pin D7 has been unable to output a high signal.

We’ve tested a fresh out the box Panda with a very simple Arduino sketch; in setup we set pinMode(7, OUTPUT) and then in main loop toggle between HIGH/LOW holding each value for 2500ms. With nothing but a DC voltmeter between ground and pin D7 the HIGH output only ever reaches ~0.83V.

We've seen this behaviour on 6 boards so far and have spent days investigating how the pins may have been damaged here, but have been unable to. And the problem is with every board.
We've also tried using an old batch of boards as a reference; those do not have the problem.
So we decided to take a fresh Latte Panda from the new batch, which has never been powered on before, but the problem is immediate. This unit was untouched, in the box.

We're using an iPad power supply (as recommended).
We have nothing connected to any other Arduino pins.
We're using an HDMI monitor, USB KB & mouse and they are the only peripherals connected.

We're measuring 4.85V on the Arduino header 5V pins (eg 23 to 24).

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Site Admin
Posts: 47
Joined: Fri Apr 15, 2016 9:21 am

Mon Dec 23, 2019 3:17 am

Hi there
I think it will be better if you can email for this problem also.
According to your description,I think it might cause by the components problem.
But it should be tested before come to conclusion.

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Site Admin
Posts: 2768
Joined: Wed Jan 20, 2016 9:09 am

Mon Dec 23, 2019 3:23 am

Hi Tempest8008
Thanks for your feedback.
Please feel free to contact our tech support ,we will give further support for the question timely.
Enjoy Tinkering with LattePanda ! :lol:

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