This project has so much potential.

As long as the leakage currents aren't too great, you can connect the 4 COM outputs together and to a single analog pin on the Nano. And then use the Enable inputs of the four multiplexers to enable a single multiplexer at a time. Then you can have the 64 pots on a single analog pin. With 8 pins (and 8 of the lots-o-pots boards) you could have 512 pots!

😮 Omg thats the project i am on to right now. Just finished the design of the pcb yesterday. You just made my day watching this work. Keep up the good work. Really good videos.

Really information rich, great video!

You should check the linearity of the cc outputs. The analog mux does not cut the line completely but its disconnected pins become "Hi Z", making its connection to the COM ın the order of Megaohms. On the other hand adc input is low impedance, loading the source. If you use high resistance pots, it is possible that combination of pot positions may affech each other. Solution 1: use 10k or lower potentiometer, add a 4 to 16 decoder and connect same select signals to decoder input. Feed each output to the corresponding pot and energize only the pot that is being read. Solution 2: add buffer amplifier to mux output so that it can drive the adc without impedance effect.

Love this channel, very inspiring :)

you are amazing. i learnt so much in this video

Nice video! Personally I struggled with unstable pots readings, but finally I was able to write class for handling potentiometer, which used hysteresis to get rid of bad readings. Moreover, I added callbacks to be able to react to a certain events (e.g. value change, going up, going down etc.)

Great video thanks Dave!

Nice work pal Dave. Like that multiplexer chip.

Good stuff! Thanks!

the resistor part of this video blow my mind , thanks

That traffic flow analogy is maybe the best one I've heard lol

You're a legend, Dave!

Did a double take on the intro. It's your pal Dave somehow became it's Chappelle Dave.🤣🤣 Nice channel, good job.

Thanks for the awesome videos, which Arduino is capable of handling MIDI usb also with LCD and sd card? I am doing a midi controller project that open MIDI file from SD, play it back on MIDI usb out, while receiving some controls from MIDI in and shows some info on LCD, what do you suggest for hardware/software?

I do like an overkill project. Now to map all the pots to different things in your rig!

all depends on what refresh rate you want, the ATmega328p datasheet specifies the adc max rate to 15000 reads/sec, so if u only need a refresh rate of for example 30 you just divide 15000/30=500 so the number of pots you can connect in that case is 500, to do this you can cascade the 16to1 analog mux with 16 others witch would give 16x16 = 256 and then use two analog inputs of the nano for a max number of inputs to 512

Super job, however @thepcman is correct 10k pots @ 30mA is a better choice, the lower the source impedance the better, I think100k might be a bit high depending on the difference between 2 successive ADC samples. The ADC in the Atmel 328P uses an 8 channel multiplexer with a sample and hold capacitor so, with a high impedance source (100K worst case ) there might not be enough time to charge/discharge the the S/H capacitor properly, possibly leading to some strange readings. Below is a extract from the 328P datasheet page 212: "The ADC is optimized for analog signals with an output impedance of approximately 10k or less. If such a source is used, the sampling time will be negligible. If a source with higher impedance is used, the sampling time will depend on how long time the source needs to charge the S/H capacitor, with can vary widely. The user is recommended to only use low impedance sources with slowly varying signals, since this minimizes the required charge transfer to the S/H capacitor"

Shortcut calc for identical parallel resistors is value divided by number of resistors. 👍

Would you ve able to provide a list of what footprints you used for each component? Noob to KiCad and could use some direction on selecting the right components.

To find the resistance in a situation like this where you have the same resistor in parallel, you just need to take the resistance of the resistor (100K) and divide it by the number of resistors (64). The answer would be 1.5, but that would be 1.5K, so if you times that by 1000 you get just the ohm amount.

You are a prince amongst men.

how about reliability handle analog input with multiplexer, is there any problem or is as good as using direct analog pin (A0,A1...etc)

Can you make customize sound on this?

The code you linked goes to an older blog post that contains V1.2 of the controller - in this video you're using V1.4. Is there a difference when using the Nano? The code in V1.2 says it is for the UNO only. Thanks.

Hello! Where can I download - gerber files - for this wonderful project of yours, so that I can collect it from your Video?

Thank You for 'doing the math' on this territory.

The nano actually has 8 analog inputs :) A6 and A7 are analog only pins, as where A0-A5 are multi use. Most tutorials ignore these pins because they have extra rules if it where. Anyway. I would say not 96, but 128 pots without resorting to other tricks like multiplexing the multiplexers with chip select pins.

Thank you for this awesome video! I am trying to build an interface for the BP synth and thought I use the code from this for a midi controller to the BP synth. I notice there is a difference between the code you supply in the notes and on the video. Would it be possible to get version 1.4? Thanks again for the great videos.

Would all this muxing work with FSRs? and what about latency? Is it possible to avoid it and have real time readings and conversion to midi? I am planning on building fsr matrix with around 64 inputs, converting it to midi. So far i've bought arduino and make 5 of fsr work on analog inputs. Struggled as it is my first project ever, but it was a good day!

Great Midi controller for Ableton Live!

Hello. The link to the code shows a file with description to be V1.2 only arduino uno. Is it still OK with Pro micro ?

Just made one with 32 pots. One of the 2 mux circuits behaves as it should. The other its very strange and unstable. When you turn a pot the pots next to it get voltage change whith result erratic midi signals...cant find solution yet. Maybe bad pcb design? 😢

6:45 64x 10k pots have common resistance of 156.25 Ohms, at 5 volts current will be 32 mA; total power = 0.16W. Plus consumption of 4 multiplexers of course.

I am under the impression you can only read one pot at a time with a mux. This means you can't turn two pots at the same time and get them to send data. Is this correct?

Very very cool

There are so many Nano versions so I don't understand which one to get? Live in Sweden.

Or, you can just use 5 / 100000 * 64 to find the current directly.

how many knobs can you use at the same time?

One really needs to get about 31 friends so everyone can grab two pots and twist at the same time ...

Thanks man, some folks want to charge big bucks for this info

I think you should add a 1K bleed resistor from each pot ground pin to ground to prevent excessive current from being drawn through the pot when turned to it's minimum position, fails or shorts etc.. I = V/R so if one of those pots is turned low and the resistance is 1 ohm....that's 5V pushing 5A and smokey smokey time :) Tying the middle wiper to the outer wiper pin at ground will prevent this but the pots resistance will be affected.

how do i convert serial to midi .Hairless midi isn't available for windows 10 anymore does anyone know how to make a midi controller using a nano ,uno or a mega. (i have these lying around . too broke to buy zero, due or leonardo🥺)

Im still curious how many knobs can you use at the same time? Amazing project thanks for sharing!

I get this error: Compilation error: 'POTS' was not declared in this scope Any help?

How many pots (message) of them can you use at the same time?

And I thought he'd be extra smart about it and just setup a key matrix. 8 analog inputs, 8 strobed outputs.

just curious. What is the overhead time in case I grow 64 pairs of fingers and twiddle all of them at once? ;-) also, how difficult would it be to have some sort of 'learning patterns of behaviour' algorithms built-on in order to match certain POB so the individual pot has the appearance of being there all the time by the controlee? Thanks!

Is everything the same wire and code when using faders instead of pot meters. Thank you

Interesting 🤔What happens when 2 or more pots are adjusted at the same time? Which gets preference? Does it work as a polyphonic input?

Do you have the code for that? I am using an Arduino Micro with four 74HC40512 Multiplexers. It's USB MIDI compliant. So I don't have to use the MIDI Din adapter. I have followed you since the first controller video. I appreciate all you do!

When parallel resistors are the same size, you can simply divide a single resistor value by the number of parallel resistors. Again, this only works when all resistors are the same size.

13:16 wrong. if you not powers Lots-o-Pots 5V from output pins of µC you will not exceed 200mA limitation. You project is powered from USB or from AC/DC adapter, so Atmega chip limitation is not involved at all.

Can arduino read multiple pots at the same time? i.e. if you turn 2 at the same time will the DAW get signal from all at the same time or one after the other?

you can add another 64 pots because there is 8 anolog inputs on the nano. Mind blows.

I came for a midi controller and I'm leaving with a time machine

Does anyone know how this is possible without using MUX? Wanting to be able to turn multiple pots at once

can you make this with a pro micro atmega 32u4

I've done the math as you taught it (but for 50K pots), and I ended with a total of 781.2 Ohm of resistance (for 64x 50K pots) , which would result in a total current draw of 0.0064A. But... did I do the calculations right? I got no one around me to ask. (I couldn't find the 100K faders I liked. But there's nice 50K faders on Alie-express)

Godd! Thanks! (But the I= U/R )😉

Thank goodness, the nano didn't create a local black hole and suck in the universe!

But.... did any of the chickens get hurt?

64 pots 1 cup

2:12 WRONG! Arduino Nano has 8 analog input pins.

Are any of the "dual axis rotary encoders" my search patterns have managed to generate for me on some of the sales sites actually real? 64 of these from Alpine Alps is going to run me almo0st a thousand bucks from Digikey or Mouser, but maybe that is just the reality I dove into. 64 pots is not far behind for long-lasting ones. it is for a matrix mixer project, thanks I am thinking 1/10th of that budget into a redesign using touch screen may be the ticket out, but (conjuring the "I Like Turtles" kid. "I LIKE FONDLING KNOBS" ;0

Problem - if all pots are set to minimum you get almost a short and will likely blow the Arduino. Solution - 1 x 270ohm Resistor in series to ensure no more than 20mA flows regardless of pot settings.

17:50 there is a better way to create 64 potentiometer array...

I could use your help! I entered this code into the IDE and keep getting an error message. Any Idea? ERROR: error: 'MP01' was not declared in this scope Pot *MUXPOTS[] {&MP01, &MP02, &MP03, &MP04, &MP05, &MP06, &MP07, &MP08, &MP09, &MP010, &MP011, &MP012, &MP013, &MP014, &MP015, &MP016, &MP017, &MP018, &MP019, &MP020, &MP021, &MP022, &MP023,&MP024, &MP025, &MP026, &MP027, &MP028, &MP029, &MP030, &MP031, &MP032, &MP033, &MP034, &MP035, &MP036, &MP037, &MP038, &MP039, &MP040, &MP041, &MP042, &MP043, &MP044, &MP045, &MP046, &MP047, &MP048, &MP049, &MP050, &MP051, &MP052, &MP053, &MP054, &MP055, &MP056, &MP057, &MP058, &MP059, &MP060, &MP061, &MP062, &MP063, &MP064 ^~~~ This something about a suggested alternative. Any help would be appreciated greatly!