DIY Chewie Monsta (Ed Sheeran) Loop Pedal

Mobius Pedal for under £150

If you read through this and think its a bit too much work leave me a comment, I'm going to make some of the bits/complete pedals up (with a revised design and some proper PCBs etc) and putting a few on ebay if enough people want them.

This is not a full guide but more of a 'what I did'. I think it will take a bit more research to build it if you have o experience in electronics or scripting but the Arduino and Mobius forums are full of answers if you need them, or just leave me a comment.

Being a massive Ed Sheeran fan and a live performer in an acoustic duo I have been into loop stations and live looping for quite a while. After watching Ed performing his plus album live I decided that I needed to get a loop pedal for my own live performances. At the time he was still using the RC-20 but I decided that having 2 separate tracks would be better for what I wanted so I went out and bought an RC-30. I have used the RC-30 with the FS-5U for quite a while now both for recording and live performances and I have to say it is great. It really helps to add in extra dynamics to our performances and helps to liven things up in a pub gig.

After a while I decided that 2 tracks wasn’t enough and changing between each track can be a bit distracting as no matter how confident I got I still had to look and check I was on the right track before I stopped or played it. I spend a fair amount of time designing and building things anyway (it’s also part of my job) so my obvious next thought was ‘can I make one…’

I spent a lot of time researching and decided that to get decent latency and a good enough sound quality for recording and gigging probably wasn’t going to be possible without a massive time and money
investment. I had a look at the RC-300 but it’s a bit too expensive for me considering I would only use a few of its
features. So I decided to leave the idea and just carry on with my RC-30.

Then Ed release the multiply album and along with it came the Chewie Monsta. As soon as I saw it I wanted one so I started doing some research. It turns out that it is basically a MIDI controller that controls a software called Mobius running as a VSTwith Ableton as the host. This allows multiple inputs and outputs but best of all Mobius is totally customisable. WOW I could make one of these!! After a load of searching it turns out nobody had really come up with a way to make something like this. A few people have made similar things but they all wanted to include other bits in that I didn’t need. I also wanted to space out the pedals more like Eds.

So I spent A LOT of time watching as many videos of him using the pedal to try and work out what it was doing. This is what I came up with.

The board has 9 buttons:










Fairly simple I thought but watching him use it didn’t seem to make sense. I assumed the arm track buttons where just arming the track and then you would have to press Record/Play to start them but this wasn’t
happening. So I guessed that the Mode button switches from Record to Play. When you press the Track1, Track2
etc this is Record/Overdub/Play in record mode and Play/Stop in play mode. Watching a load of videos again
this seemed to make sense to what Ed was doing and seemed to make the whole loop pedal a lot easier to use. So I decided to go with that and got to work and here’s how I did my version of this pedal. See a video of it in action here:

One thing to mention is that this is not an exact copy there are a couple of things that I have noticed are different in the working of the pedal. These are:

When Ed starts the first recording I think he records onto all channels but with the input level on all but the first channel turned down (I think this is done a lot which ever tracks are not being used to record have
the input level at 0). This will automatically give him 4 loops of exactly the same length synced up in one go.
I haven’t done this as I didn’t see the need. I like to see that if I haven’t recorded to a track it is still empty.

When all tracks are stopped the Track1, Track2 buttons become arm buttons so he can stop all and then select say 3 tracks and bring them all back in together. Again I only wanted 3 tracks so I didn’t see the need for this for me.

NEXT: What you’ll need (leave out anything you don’t want. This is what I used for mine):

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Step 1: Gather the Bits...


Arduino IDE Software (

Mobius 2.5 ( - FREE Nice to give them a donation though because this is the key to the whole thing).

DAW (if you want to host Mobius as a VST)


Audio Interface (I use
not around anymore but as long as it has enough inputs and a MIDI In it will

MIDI Cable 3m (£3.99)

VGA Cable 3m (£5.28)


For the Pedal

(You could use an off the shelf MIDI controller like Behringer FCB1010)

Buttons (I used M-AUDIO SP-1 sustain pedals
£10 each)

Screen (
- £24.19)


MDF Sealer £5

MDF Primer £5

Spray Paint £7.50

ATmega328 (with UNO bootloader & Arduino if you don’t already have one) -

PerfBoard £0.78

1kOhm Resistor £0.63 (for 100!!)

LED £0.14

LED Bezel £0.37

7805 Voltage Regulator £0.37

100uF Capacitor £0.08

16mHz Crystal £0.21

22pF Capacitor £0.02

2.1mm DC Jack socket £0.62

9V 2A Power Supply with 2.1mm DC jack plug £9.85

VGA Socket ( - £3.83)

180 Degree 5 Pin Din Socket - £0.35

Total Cost of Mine was: £142

Step 2: Make the Enclosure

Obviously do what you want here. Make it work for you, how you want your buttons to be. This is the point of building your own, you can have it just how you want it. Here's some info on what I did.

Here is the plan I drew up for the controller enclosure. I’m not going to go into too much detail there are plenty of good woodworking/finishing tutorials out there.

I painted mine in black and made up some labels. I wanted something custom so I added a bit of decoupage for fun!!

To fix in the pedals I used self adhesive Velcro so I can replace them in future if needed.

Step 3: Making the Electronics

Here’s a schematic of my pedal electrics. If you want to build this yourself I suggest
you look at
which shows how to setup an Arduino on a bread board. If there is enough interest I will make a
load of these up on a PCB with ¼” Jack connectors (or screw terminals) so the
pedals can be connected without any soldering, and stick them on ebay.

You could do this in many ways and if you want to use an Arduino but don't want to do the soldering you could get an Arduino Nano, Arduino micro, Arduino Uno, teensy or any other Arduino IDE compatible device. Download the pde and upload it to your board/chip (lots of guides on this depending what you use) and wire up each pedal, the LED, the MIDI Socket, a VGA connector and a power socket.

Step 4: Mobius

Mobius is a really great VST and makes this whole thing possible. All the scripts are here to download (some of these still have in some bits that aren't needed as I've been through a few revisions but they work fine). Just attach each script to each pedal. To do this have a look at the pics. Put the pedal into Record Mode (LED on) press Global Capture in Mobius, select the script and press the button followed by New. Repeat that for each button in Record mode. Then press Mode to change to play mode (LED off) and repeat.

Onto Mobius

I suggest you start with stand alone Mobius just to test your pedal all works. Have a look through the documentation (
as it is much more detailed and very interesting to see the capabilities of Mobius. They also have a great forum
here The scripts are in the download folder. Unzip it and put it somewhere
you will remember.

To select the scripts and get them working with the pedal have a look through the images.

Have a play and see how it all works for you.

If you want to setup Mobius as a VST have a look at the forums or do some searching as it’s different for every DAW.

Any questions leave a comment and I’ll get back to you.

Have fun!!

Step 5: And Some Final Pictures.

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    22 Discussions


    Question 2 months ago

    This is an awesome design! In the process of building (I have no experience with electronics or coding, but I'm learning a lot as a result) and am having trouble getting the screen connected to my laptop. It appears to be RCA connector and my laptop only has mini hidmi. How did you get your screen connected to your computer?


    5 months ago

    Great job dude!!! If you're willing to help I have a question for you. I have a diy footswitch midi controller with 8 buttons based on Chinese Arduino NANO, not on UNO :( so I needed to change the RX TX pin numbers. I downloaded Sonnit Looper software to test it but after a short period of looping and playing, the software is crashing on a button press. Any idea?


    1 year ago on Step 5

    can you send me the PDF i dont have access to the site. I will be using the




    2 years ago

    how did you connect the sustain pedals to the arduino, in other words. How do you connect a 1/4 inch cable to an arduino to send signal?


    2 years ago


    I'm really interested in buying one of these!

    I'm an acoustic performer specialising in live loop music and I'm moving up to stages like carfest south 2017 and I currently work with the Boss Rc-300 which is great but as you say, it's destracting trying to figure out what button to push while playing on stage so I've been looking for 'the next one better' and I've found nothing until this pedal so my email is...

    ...Please give me a shout so we can talk about the pedal and maybe purchasing one for myself!

    Riley K


    2 years ago


    Is it still possible to buy one of these???

    my email is if you have info on purchasing this beautiful invention!


    2 years ago

    Hello great post

    I'm new to all of this, but I understand some things electronically. Been a long time since I've done circuits. But I'm wanting to try and have a good go at replicating Ed Sheerans Chewie II. Just received my uno. been looking at your coding, I'm trying to sus out where everything goes on the circuit. But I'm having a hard time understanding it. Would you be able to send me the fritzing file of the circuit and maybe assist me?

    thank you, would really appreciate it!

    1 reply

    Reply 2 years ago

    Hi. I don't have the fritzing files any more after my computer decided to stop working!! If you email me some more specific questions on what your struggling with I'll answer what I can. Email


    2 years ago

    hi and thanks for sharing !

    Where can we buy this ? i know you're making some ... and i havent see the link to a shop ! thanks for your answer Edsutcliffe ... :)

    u can mail me :


    2 years ago

    man! you are so genius! i'm korean musician. i will try it! anyway you don't make or sells finished goods?

    1 reply

    Reply 2 years ago


    Yes I'm making them, well updated versions. Checkout my website at for more info. Thanks


    2 years ago

    Are you running mobius on a PC? What are you using for midi interface? Can't mobius be controlled from a keyboard? Could you take the guts of a mini usb keyboard, connect the switches to keys and modify your mobius script to use keys instead of midi inputs? That way you don't need a midi interface, arduino or any of the other components related to the connection to the PC. Could use this with the numlock as the mode button and use the numlock light for the record light:

    Also I'm looking to make an all-in-one unit that runs off a raspberry pi running mobius via Wine which apparently is now pretty doable. No schlepping a laptop around.

    1 reply

    Reply 2 years ago

    or you could do this if you're not into soldering keyboard contacts:


    3 years ago

    Hey there! I would be very interested in buying a pedal from you!! email me


    3 years ago

    Hey! This is really awesome. I have a few questions, but I was wondering if you were making any more so I could buy one. Shoot me an email!


    3 years ago

    Hey! Congrats for the project. Could you explain please what are the function of those toggles?

    1 reply

    Reply 3 years ago


    The toggles basically mean that a MIDI note is sent when you press the pedal and that the note off is sent when you release the pedal.


    3 years ago

    Hi, are you selling anymore of these? If so you can email me on


    3 years ago

    Hey I made one with 9 buttons but I am still having trouble with the coding. You recon you could help me out?

    1 reply

    Reply 3 years ago

    Hi. Yes send me an email with some more detail @