Docs: Sound (DFPlayer)

Mon, 01 Jan 0001 00:00:00 +0000

DFPlayer Module

If your mainboard got delivered with an already equipped DFPlayer, you most likely got the original DFRobot-DFPlayer with a ‘DFRobot LISP3’ chip.

If you need to attach one, and your’re not located in the US, you might also use a DFPlayer-Clone with a ‘MH2024K-24SS’, ‘JL AB23A799755’ or ‘GD3200B’ chip, as sold by Amazon, AliExpress or the like.

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When using a DFPlayer-Clone,
in an open-mower-mainboard up to version 0.13.x,
you should cut-off Pin-11 from the DFPlayer-Clone:

If not, volume control will not work and always play at 100%!

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You also need to take attention that your motherboard has the required R7 and R13 (1k) resistors assembled:

Change DFPlayer’s V_CC to 5V

All mainboard version ≤ 0.13.x supply the DFPlayer with 3.3V by default. But for full sound support, it’s highly advised to change this to 5V, otherwise you might risk your Pico’s PMIC 💣. More technical details here: Sound-Readme

Don’t forget to cut the trace between middle and 3.3v! It’s there, even if it’s barely visible! (if you forgot, you’ll bridge the 3v3 with 5V resulting in incorrect battery voltage reporting)

Once changed, you’re save to enable full sound support via OM_DFP_IS_5V=True mower_config switch.

Sound SD-Card

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SDCard (128Mb) and DFPlayer Mini are included in the kit.

Take an SD card (different from the one you are using for RPi), format as FAT32, copy all MP3 files and folder to the root folder. Insert SD card to DFPlayer. Insert DFPlayer into motherboard SD card facing right (towards RPi)

☝️ Updated 11/2024

The soundfile structure completely changed in November 2024. If you already prepared your SD-Card before, it still works, but for full sound support you need to replace all files with the new structure (and take care that no old origin files remain on the SD-Card).

Speaker mount

There’re a couple of 3D-Printable speaker mounts available for different models. Worth to check OpenMower @ Printables

OpenMower v1 Documentation – speaker