Commercial Bluetooth pedals, designed to allow musicians to flip pages of sheet music on a tablet, have the sort of inflated price tag you’d expect for a niche electronic device. Rather than forking as much as $100 USD over for the privilege of hands-free page flipping, [Joonas Pihlajamaa] decided to build his own extremely low cost version using an ESP32 and a cheap foot pedal switch.
In terms of hardware, it does’t get much easier than this. All [Joonas] had to do was hook the pedal up to one of the ESP32’s digital pins, and plug the microcontroller into a USB power bank. From there, it became a software project. With the ESP32-BLE-Keyboard library, it only took a few lines of code to send RIGHT_ARROW or LEFT_ARROW depending on whether the pedal was quickly tapped or held down for a bit; allowing him to navigate back and forth through the pages with just one button.
[Joonas] mentions that the ESP32 development board he’s using is too large to fit inside the pedal itself, though we wonder if the bare module could get slipped in there someplace. Of course you could always build your own pedal with a bit of extra room to fit the electronics, but for less than $2 USD on AliExpress, it’s hard to go wrong with this turn-key unit.
Looking for an alternate approach? We covered a Bluetooth page turner last month that doubled the inputs and packed it all into a handsome wooden enclosure.
Yes, this is good.
Master, what is my purpose?
Well, if ever I press this switch momentarily, you will send a certain signal. If I press the switch a little longer, you will send another signal.
That’s… that’s it?
you pass butter
– So one of my cores will send one signal and the other one another signal ?
No, my son. You´ll be awake and one core will be useless while the other one will be idle 99.99999% of the time, actively waiting for orders.
– It must be a special punishment for me, since one little brother of an inferior cast like for example an NRF who have be happy doing that task. What did I do wrong to deserve that fate ?
You´re too popular, look like a nail and your masters only master the Arduino hammers of ignorance and laziness.
Oh wow this is working on an iPad. I remember I was only able to connect on Android before..
A bit noisy for studio use
Thanks, works well.
It really worked perfectly!!
Just wonder, if I want to have a second button for the “previous button”, how could I do it on the code?
Thanks!