Wiring encoders

[Ernisius]

I already have a display, soundcard RPI4, and have Zynthian working great, so I don’t need the kit
I would like to add the 4 encoders but I don’t know how they are wired to the RPI. Is there any wiring diagrams so I can connect the encoders and switches without modifying the software.
Thanks

[wyleu]

I’ve done a few encoder to Pi implementations and there is a fairly detailed thread here…

A Build with Variations variation: HiFiBerry Amp+

A variation on a variation! I have a Hifiberry Amp+ in the hifi berry generic case and have decided to see if I can implement a fair bit of zynthian on it using bits that I have lying around… Here is the topless hifiberry peaking out from under the desk . . . [image] Here is the top of the case with the four encoders mounted on stripboard [image] The cuts have been made in the stripboard and links has been added to take the centre track (0V) at the extreme ends to connect 0V to one o…

The configuration is performed within the zynthian webconf and there is a mapping ( documented in the thread I believe

A Build with Variations

This is a build report, including as-built schematics and a small patch file. [image] Here is a picture of my just completed zynthian build (calipers for scale.) On the small protoboard are the connections to the GPIO pins. On the larger protoboard is the MIDI RxD interface hacked together from available parts. Note the absence of the GPIO-ext (MCP23008 and related.) I found two unused GPIO signals on the rPi connector and referenced those in /zynthian/zynthian-ui/zynthian_gui.py rather th…

) that implements the choice of pins, but having said it’s all possible, I would consider using an allinone card as it avoids the wiring hell of a ribbon connector and all the soldering and plugs and sockets you inevitably end up with to make construction and testing viable.

I’ve never yet done one with the S1-S4 switches implemented and since, in my world, those are fairly important interface devices I tend to shy away from the GPIO approach. It can be a bit of a beast to maintain and I have moved at least one pin that seemed to fall foul of some upstream use as Pi’s evolved.

It is quite staggering what one can stick in a raspberry Pi 60W amp case!

For true zynthian historians on the linked thread there is the first semi acknowledgement that the audio out’s are reversed . . .

[Ernisius]

Thanks. That is useful, though I agree that GPIO solution is messy, and difficult to maintain. I prefer the Zynaptic module mux solution but it is sold out.
I assume there is no open source wiring information for the Zynaptic module.

[wyleu]

It’s all in the git repository.

zynthian

[tunagenes]

And here’s where you’ll find the schematic for the Zynaptik module:

zynthian/zynthian-hw/blob/master/Zynaptik_v3/zynthian_zynaptik.sch

But you’ll need to install KiCad to read it.

[Ernisius]

Thanks. Installed KiCad and have all the information I need now.
I can definitely build this . I ordered 23017 mux from Amazon for £7. Already have the rotary encoders. I’ll try to wire it up tomorrow and upload a photo.

[le51]

@Ernisius

I ordered 23017 mux from Amazon for £7

Ouch !! That was the price for ten of them a couple of years ago

[riban]

At that price I would be tempted to use the STM32 solution!

[Ernisius]

Thanks for all the help. My Zynthian is now working great. The only things I needed to buy was a Waveshare 5" display and the 23017 mux. I already have have the RPI, encoder switches and a behringer usb sound card.
The mux came pre soldered on a pcb with connection strip pins that needed to be soldered to the board. I wired it all up using wirewrap wire.( I still have the wirewrap tool from when I was a computer engineer in the 70’s) all worked first time.
I know the basic kit with the Zynaptic module is a neater solution, but it’s not available at this time. also I don’t think I currently need the extra functionality it offers.