Bluetooth Page-turner Pedal for Sheet Music Apps





Introduction: Bluetooth Page-turner Pedal for Sheet Music Apps

This Instructable uses an Bluefruit EZ-Key module to make a Bluetooth page turner pedal. The pedal enables me to easily turn the page on any sheet music app I wish to use on my tablet, without taking my hands off my saxophone. I use it with the Mobile Sheets app on my Android tablet, but it works with other apps and with other devices such as the iPad.

WARNING: It looks like the Adafruit EZ-Key is pretty much out of stock everywhere - you may want to check stock before making plans. Goto to or,uk.

Commercial units are available, but buying one is (a) more expensive and (b) much less fun. I did consider using a low-cost Arduino Pro Mini with a cheap Bluetooth interface, but it's hard to implement the HID interface required, and so I settled on using the Adafruit board instead.

Let's get on with it.

Step 1: Gather Your Gear

For this project I used:

- 1 off Laney double foot pedal
- 1 off Adafruit Bluefruit EZ-Key (info here)
- 1 off 16mm OD SPDT switch, latching, with blue LED 
- 1 off 12mm OD SPST switch, momentary, with red LED
- 2 off momentary footswitches
- 1 off PP3 battery connector
- 1 off PP3 battery
- 2 off 1k0 resistors
- some PCB pins
- some 0.1" connector shells
- connector teminals to fit above
- stranded hookup wire
- double-sided automotive tape

Step 2: Hack Your Case

There are loads of cheapo pedals out there, but I wanted one to last. I bought a two-switch Laney pedal for UKP14. It's made from 1.7mm still plate, which means it's heavy enough not to slide around the stage. Sadly, I could only find one with locking switches, meaning I had to buy replacements.

The Laney box has heavy-duty foam stuck to the bottom, and this has to be removed where it overlaps the join in the case. The second picture shows the foam having been cut away. 

Once the case is open, the jack cable is removed and the PCB with existing switches is taken out. Now would be a good time to open up the mounting holes for the two switches. I put mine in the back of the case, but I did this a little later which meant taking the footswitches out again. 

The new switches are then fixed in place.

Step 3: Wire the Switches

The switches should be wired up before fitting.

Each switch will have a pair of LED terminals. An appropriate resistor will be required to drop the voltage and limit the current across the LEDs. I used 1K for both of mine.

As you can see, the limiting resistor for my ON/OFF switch goes straight from the switched side to the LED. I've taken the 9V supply from the battery directly to the switch.

All wires for the PAIR switch go to the Adafruit Bluetooth EZ-key.

There is heatshrink sleeving on every terminal for robustness.

Step 4: Mount the Hardware

The switches are mounted and secured in position.

I then cut a strip of double-sided automotive tape to secure the EZ-key in place. I did the same for the battery, making sure it wouldn't foul the case when reassembled.

Step 5: Connect Up

Connecting up is pretty straightforward.

In this image:

- the footswitches are connected to '0' and '1 on the EZ-key, as well as to ground (brown, blue, black wires);
- battery 9V through the switch to 'Vin' (red wire);
- battery 0V to 'G' (black wire);
- Power switch LED +ve to Vin via limiting resistor
- Power switch LED -ve to 'Grounds' (black wire);

- PAIR switch contacts to 'PB' and '3V' (white wires);
- PAIR switch LED +ve to 'L2', -ve to 'Grounds' (red, black wires).

The PAIR switch LED has a limiting resistor soldered onto the end of the connecting wire - see image.

The third, rather poor image shows the connections in place.

25 Nov 2014 - I have added a circuit diagram.

Step 6: Done Deal!

With the wiring connected, it was time to test. 

The blue LED came on with the power, and the red LED started flashing at about 1Hz, showing the device as discoverable. I paired with my tablet, pushed the PAIR button and that was it - it just works.

Adafruit's guide to LED meanings is below.

My pedal was simple and did the job.

There's an exhaustive guide to the EZ-key module and to reprogramming output here.

11 People Made This Project!


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Hello Peakacentral
This is an awesome Instructable! Is it possible to use a Adafruit Feather 32u4 instead of the Bluefruit ez-key? I can't find any stock of the Bluefruits. Can you also just assist me with the wiring. It would be appreciated.



I’m about to (try to) make one with the Feather M0 LE. I’ll try to post results and let everyone know how it goes. I am lead to believe adafruit will re-release the EZ Key but they don’t do ETAs and it’s obviously been out for ages!

Sorry for the late delay. I'm not going to redesign it sorry - be a maker and publish it on instructables!

Im so keen to make this. I have my stomp box and a few bits. I have a beginner question. Why does the on/off switch need to be double throw?

It doesn't, my mistake.

The one I used had a single pole switch plus the terminals for the internal LED.

I'd be surprised if you can find the EZ-key nowadays - I don't think Adafruit make them any more. Bad times!

Hey Peakecentral
Can you please assist me in using a Adafruit Feather 32u4 instead of the Bluefruit. I can't find the Bluefruit in stock and want to make the pedal because this is a really nice instructable. I just need a rough wiring diagram of some sort.



Has anyone been able to solve the issue whereby with this turned on, the onscreen keyboard doesn't appear? I need it to pick songs but having this device connected disables the onscreen keyboard across all apps.

You need to use a proper app for sheet music on you tablet that works with a page turner.

I use setlist helper on Android the songs come up in in an alphabetical list so I can easily scroll for the corect song. Plus you can make a playlist flr each gig. Easy

The Adafruit device is seen as a keyboard, which is why the soft keyboard does not appear.

Hi there,

I wasn't aware of this, but an email to Adafruit would probably get a response. Let us know!