I am having difficulty making an KY-040 work for volume control and play/stop on my Volumio system. Here is the data on my system:
Platform: Raspberry Pi 4B 8Gig
Volumio System Version: 4.119
Active Plugin Version I have Tried: Rotary Encoder II (V2.2.0, V2.2.1)
Other Active Plug Ins: Now Playing (v1.0.6), Touch Display (3.6.0)
Inactive Plugins: FusionDSP (v2.0.79)
Encoder Type: KY-040
HAT: Innomaker Amp Pro HAT
Plugin Driver: Innomaker Amp Pro
Pins Used to Interface: I have used multiple combinations of pins. There was only one instance when I was able to get the Play/Pause to work. The volume has never worked
Error Statements Received: Error in parameters - Failed to add Overlay,…
I am using the BCM designations when I configure the plugin, not the pin numbers that the wires are attached to. Every time I go down to save the config, it will briefly flash a long error statement beginning with what I show above. Then, it will give me a gray box that said the config was saved.
ROTARY ENCODER II Settings:
Rotary Encoder 1: On
Periods Per Tick: 1/2
Pin A GPIO: 22
Pin B GPIO: 17
Dial Action: Volume
Pushbutton GPIO: 27
Debounce-Time(Ms): 100
Button Logic-Level Active Low: On
Short Press Action: Play
Long Press Action: Stop
Delay for A Long Button Press(MS): 1500
Double Press Action: Repeat
Maximum Interval for Double Press(Ms): 700
In the Playback Options, I have it set up as follows:
AUDIO OUTPUT:
-I2S DAC: On
-DAC Model: Innomaker Amp Pro
GENERAL PLAYBACK OPTIONS:
-DSD Playback Mode: DSD Direct
-DSD Auto Volume Level: On
-Volume Normalization: On
-Audio Buffer: 2MB
-Persistent Queue: On
-Playback Mode: Continuous
THANK YOU!!! I spent several hours switching the wires around and trying different pins/GPIOs with not luck. But, the combo you used above worked on the first try!
Do you know if the Volume Control set to Hardware or Software makes a difference? I have not switched that one.
HW control doesn’t impact audio quality. (this happens after the DAC)
SW Control does impact audio quality, but if you can distinguish it that’s for you to decide by listening to it. (Happens before the DAC)
To avoid a complex study on this matter. Some basic info. SW control of sounds results in lost of bit depth, Rule of thumb:
‑6 dB ≈ lose 1 bit
‑12 dB ≈ lose 2 bits
‑18 dB ≈ lose 3 bits
A 2nd unwanted side effect of SW control.
Every system has a noise floor, Noise can’t be controlled by volume.
So let’s say your system has a base noise of 1%.
At 100% Volume the S/N ratio is 1% ((100 / 100) * 1)
At 50% Volume the S/N ratio is 2% ((100 / 50) * 1)
I actually did a little more work and went through every GPIO port to see which ones I could map the KY-040 to while using the Innomaker Amp Pro. Here are the results (this may help others in the future):
GPIO Port - (Yes/No)
1 - Yes
2 - No
3 - No
4 - Yes
5 - Yes
6 - Yes
7 - No
8 - No
9 - Yes
10 - Yes
11 - Yes
12 - Yes
13 - No
14 - No
15 - No
16 - No
17 - No
18 - No
19 - No
20 - No
21 - No
22 - Yes
23 - No
24 - No
25 - Yes
26 - Yes
27 - Yes
Hope that helps others that are using this Amp / Raspberry Pi combo to get the KY-040 working.
I am having endless problems with the encoder plug-in. I’ve tried numerous GPIO pin configurations and run my log through Googles AI - it claims that ‘everything is working correctly’ but I can not get any function to work, nothing at all. I’ve tried the various pin configurations suggested in the various posts and nothing works at all - where do I begin with fault finding?
