Replies: 2 comments 9 replies
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Please post your complete code between triple back ticks: ```cpp
// your code here
```It might be useful to post the working non-control surface code as well. As far as I can tell, the 4051BE is the same chip as a standard CD4051 multiplexer, the BE simply denotes that it's in a PDIP package. If you think this is not the case, please post a link to the datasheet of the exact chip you're working with. The code and instructions in the Getting Started example should work just fine using your 4051BE. Please double check your wiring. The A, B, C pins should be connected to Arduino pins 3, 4, and 5. The common out/in pin should be connected to Arduino pin A0. The inhibit (enable) pin should be connected to ground. (I'm referring to this schematic: https://www.ti.com/lit/ds/symlink/cd4051b.pdf#page=3.) If you've tried the exact code in the Getting Started example, double checked your wiring and still can't get it to work, please post a clear picture of your wiring. Are you sure the multiplexer is the issue? Maybe there's a problem with how you're receiving the MIDI data. To make sure this isn't the case, replace the line |
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Thanks, Pieter! Super grateful for your input and the library as a whole. I can tell many are grateful too. To answer your direct question: the positive strips are connected to the 3.3v pin - one wire to the right side, and then a second wire from the right side to the left. Same with the GND strips. I know these wires are solid (see below) since I did a bunch of wiring and unwiring and re-wiring with the multiplexer and got consistent results of working and not working. That's good that the code worked for you without an issue. Before I posted my comment yesterday, I stripped and re-wired the breadboard to try and best check/double-check my setup. I also moved the multiplexer to a different spot on the board, just in case a certain part of the board was bad. I will say, wires don't sit as snugly as I would like on this board and I find myself having to push certain wires back down or moving them when they slip out. But those are mostly limited to the sliding pots, I made sure all multiplex wires and teensy wires were put in snugly. I'm wondering if it has something to do with the Teensy LC? I'll have to research. And thank you for the delay heads up. I realized it was likely pointless (as it wasn't in any of the examples of yours I referenced) but that PJRC forum post mentioned some strange quirk about 4051BE's that need extra time to fully charge for accurate readings. Apparently someone commented that that worked for them... Thanks again, Pieter! If you don't mind one last question before closing this: can the AnalogMultiplex class be called as a generic mux class for all other multiplexers or do you have to instantiate the 4067/4051? |
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The delay is required between setting the mux address pins and actually reading the signal pin of the mux. Control Surface already adds this delay on all boards except AVRs (they are too slow to notice the delay of the multiplexer). You can see the code here: Control-Surface/src/AH/Hardware/ExtendedInputOutput/AnalogMultiplex.hpp Lines 238 to 248 in feee931 The full multiplexer code is in that file, it's pretty standard: Control-Surface/src/AH/Hardware/ExtendedInputOutput/AnalogMultiplex.hpp Lines 214 to 221 in feee931 Control-Surface/src/AH/Hardware/ExtendedInputOutput/AnalogMultiplex.hpp Lines 250 to 261 in feee931 One thing that might be different between the Teensy LC and other Teensies is the ADC resolution. Control Surface always sets the ADC resolution to the maximum. I've never actually used a Teensy LC, so this might be incorrect, I simply got the information from the Teensy documentation. You could try setting the resolution to 10 instead of 12 and set Control-Surface/src/AH/Hardware/ADCConfig.hpp Lines 37 to 39 in feee931 Finally, to test the multiplexer class without any of the MIDI stuff, have a look at the AnalogReadSerial example: https://tttapa.github.io/Control-Surface-doc/Doxygen/dc/d1b/1_8AnalogReadSerial_8ino-example.html
Yes, the AnalogMultiplex should work for almost any kind of multiplexer, it simply sets the address lines, enables the multiplexer if necessary and then reads the input pin, I would think that there's not much that could go wrong there, but apparently, that's not the case. Control-Surface/src/AH/Hardware/ExtendedInputOutput/AnalogMultiplex.hpp Lines 173 to 187 in feee931 |
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Got it. Thank you. I am going to be afk for a few days but will go through this and see if I can get this to work. Especially if it has to do with the LC's ADC resolution, it would be good to note for other's making their own devices with the LC. I'll circle back. |
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@tttapa Pieter - just closing the loop here. I picked up a couple 4067 muxes and have had absolutely no issues with your code - it works flawlessly and is easily expandable. It has really helped push the project to the next milestone. I'll have to dig into my 4051s as now I'm suspecting there is something wrong with them... |
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Glad to hear you got it working! |
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Hola, uso el cd4051be y esta funcionando correctamente. Es probable que haya algo mal con teensy, a mi en esp32 tuve que agregar un pequeñobcapacitor para estabilizar la entradas Los cables-jumpers estan perfectos, no estan rotos? La fuente de alimentacion esta bien? Si tienes un arduino a mano prueba con ese haber que tal va el multiplexor, |
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¡Gracias por su respuesto! Por favor desculpame, mi español no es tan bueno y hablo mejor que escribo... ja. Todos los jumpers si están buenos - nuevo y los corte antes de usarlos. Si la fuente de alimentación es bueno - el código funciona sin problema cuando no uso el multiplexer. Tengo teensy's mas grandes y también un Adafruit Feather M4. Tengo que encontrar en mi caja de cosas electrónicas si tengo un arduino. Finalmente, donde has colocado los capaticores? en fronte de los potentiometers o cerca de los pins del multiplexer? (no se esta palabra en español). |
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I am attempting a midi controller that needs quite a few faders and will need some multiplexers to bring them all together. I have some CD4051BE's laying around that I've used for other projects. However, when I call the CD74HC4051 in the code, it doesn't work. It is wired up correctly and works with non-control surface lib code.
I've tried calling the general AnalogMultiplex class and functions, but they also don't seem to work. To start, I was using the code on the main page, substituting certain elements, but now I'm not sure if using AnalogMultiplex requires something else?
Regarding the AnalogMultiplex: the address pins on the CD74HC4051 are S0, S1, S2. On the 4051BE as Channels A, B, C on pins 11, 10, and 9 (respectively, on the 4051BE). The code formatting makes the below look unreadable, so forgive the forgoing of that formatting...
My plan is to then add Bankable element, which is working currently without the multiplex. I'm assuming I can instantiate the IncrementDecrement class and change the mux array to:
{{bank, BankType::CHANGE_ADDRESS}, A9, {MIDI_CC::General_Purpose_Controller_1}},etc etcIf anyone can help with the mux issue and if I need to just pick up a CD74HC4051, that would be helpful!
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