installing default libraries on pico

[codeboy66]

hey, I'm very new to programming micropython, especially on the Raspberry Pi Pico
I don't get Libraries working... I know that if I use a Library, I need to copy the library file also to the Pico (e.g. via Thonny).

Currently, I'm trying to get the DHT sensor working... I saw that there is a default DHT Library included in Micropython: https://docs.micropython.org/en/latest/ ... l/dht.html
But how do I use this Library on the Pico?

if I'm using the default code from below, I get this error message

Code: Select all

import dht
import machine

d = dht.DHT11(machine.Pin(4))
d.measure()
d.temperature() # eg. 23 (°C)
d.humidity()    # eg. 41 (% RH)

d = dht.DHT22(machine.Pin(4))
d.measure()
d.temperature() # eg. 23.6 (°C)
d.humidity()    # eg. 41.3 (% RH)

So how to handle these standard Libraries on the Pico?
What about other Libraries e.g. Neopixel etc.

Thank you so mutch
Joe

[cebersp]

Hi,
per rightclick on the library in thonny you can upload the file to the board.
Christof

[codeboy66]

Hi,
per rightclick on the library in thonny you can upload the file to the board.
Christof

What do you mean with "right-click on the library"? in the actual code or were?

[danjperron]

Did you try my version?
viewtopic.php?f=21&t=9808
It's using the state machine. This way timing is always perfect!
Just copy the DHT22.py into the Pico. Check the test script to see how to implement it

[Grumpy_Mike]

Code: Select all

But how do I use this Library on the Pico?

You first have to load in into the Pico. To do this click on the Tools menu in Thonny and choose "Manage Packages ..."
The search for dht in the box. It should come up with at least one option. Choose the one that looks right from the description and select download.
This will then create a folder in the flash memory of your Pico and install the dht file into that.
Then you won't get that error message again.

[codeboy66]

Thanks a lot! This is useful for external libraries!
But I asked how to use the MicroPython Libraries that came with micropython. e.g. the default dht library which I posted a link to.

Is there a way to use these "default" Libraries?

[codeboy66]

I've found these files: https://github.com/micropython/micropyt ... rivers/dht
are they the files I need? (because the .py is too "short")

[scruss]

MicroPython doesn't have quite the same concept of standard libraries. Each board comes with its own set, and sometimes there's no overlap. For the Pico in particular, the WS2812 (NeoPixel) code uses the PIOs, which other boards don't have. This isn't wrapped in a standard library (yet)

The Pico WS2812 code looks like this: https://github.com/raspberrypi/pico-mic ... py#L1-L104