Puck bigger battery

[espruino-discuss]

Posted at 2017-01-23 by Adam79

@gfwilliams Is there a guide available to add a bigger battery to the puck ? Looking at making a ble joypad and thinking a 2032 will soon drain.

[gfwilliams]

Posted at 2017-01-23 by @gfwilliams

You might be surprised actually - if it's just a joypad with buttons then Puck.js will probably do pretty well (you could make it go to sleep after 15 mins of not being used).

There isn't a guide at the moment, but as a quick run-down:

• The maximum voltage for Puck.js is 3.6v, which is too low to run it directly off a LiPo battery
• You could run it off a LiPo with a voltage regulator though (someone must do voltage regulator + LiPo charger combo boards, in fact you could probably change the resistors on a USB power bank's supply)
• The simplest method is probably to use a standard Lithium (not ion/polymer) battery like this: http://uk.farnell.com/varta/6127201301/battery-lithium-1-2aa-pcb-3v/dp/463310 - not rechargeable but it's got almost 5x more power than the CR2032. The full AA size ones are even better.
• LiFePO4 batteries have the correct voltage range too - and are rechargeable. They could be a really good bet

[espruino-discuss]

Posted at 2017-01-23 by ChristianW

I am doing exactly that right now.
Hooked up an old arcade joystick mechanic to 4 pins on the puck.

There is not much drain apparently.

I also disconnect after some seconds of inactivity but not sure if that is actually necessary...

Mainly there is a setWatch() function for every direction (and later some buttons) - the rest is communication code for establishing, sending and disconnecting.

[espruino-discuss]

Posted at 2017-01-23 by Adam79

Great thanks for the replies.

I'm thinking about using a couple of these https://www.adafruit.com/products/2765 to fly a parrot minidrone ( all BLE comms). Big pipe dream with lots of coding ahead.

Someone has already done alot of the hard work https://github.com/fetherston/npm-parrot-minidrone/blob/master/lib/MiniDroneBtAdapter.js

[gfwilliams]

Posted at 2017-01-23 by @gfwilliams

Nice - @christianw do you have any pictures? It'd be great to see!

@adam79 sounds fun - I have a minidrone too so it'd be great to give it a try if you do it. I know I saw a talk where someone was using it with Web Bluetooth - I don't know if his code might be easier to integrate? https://github.com/poshaughnessy/web-bluetooth-parrot-drone/blob/master/js/drone.js#L387

Unfortunately Puck.js doesn't do notifications yet, but it doesn't look like you need that for normal control.

[espruino-discuss]

Posted at 2017-01-23 by ChristianW

@gfwilliams: See the pictures attached.

The project in a whole is a 12 x 20 LED matrix with 12 rows of 30 LEDs / meter RGB stripes in a 700 x 400 mm box.
It is currently run by an Arduino pico (sorry for that, already considering to migrate it to Espruino later because C/C++ is a different thing and Arduino has quite limited RAM...) with a HM-10 BLE module (the original one, not the clone).

The joystick can first navigate through a little menu (currently: Tetris, Fireplace, ...some other demo...). I am about 95% finished with Tetris now.

This is the puck code: https://gist.github.com/Whizzard/9ca5caeed42c0ce7659cd98231626289

I have also attached some videos from the menu, the tetris intro page (with highscore) and the fireplace simulation.

---

Attachments:

• IMG_8460.JPG
  
• IMG_8461.JPG
• tetris-intro.mov
• fireplace.mov
• menu.mov

[espruino-discuss]

Posted at 2017-01-23 by ChristianW

PS: @adam79 the puck with the joystick is powered for 2-3 weeks now and mainly sleeping because of the setWatch-function in Espruino.
Still shows 100% battery:

>NRF.getBattery()
=2.84150390624
>Puck.getBatteryPercentage()
=100

I would not worry right now about battery issues unless you do something battery-draining in your code.

[gfwilliams]

Posted at 2017-01-24 by @gfwilliams

@christianw good to hear about the battery! And thanks for that post - that's really cool! So at the moment the animations are done on an Arduino?

Had you tried making your joystick into a BLE hid device, so you could use it with any computer?

Also, just a quick warning - the pads you've soldered to on the top won't be very strong and could lift if the wires get pulled - it's probably worth trying to stop the wires wobbling around too much by holding them in with hot glue or something?

[espruino-discuss]

Posted at 2017-01-24 by ChristianW

@gfwilliams: Actually the first thing was a research if a BLE(!) (not the old standard) was readily available - but not much luck here. There are 5$ HID BT devices, but they won't talk to a puck because no LE there...
Also not sure if a HM-10 will work with a HID device at all. I just tried to keep the protocol simple instead of following a (maybe more complex) standard, but I may try soon.

Thanks for the warning about the pads. Because I don't like hot glue I may secure it with a zip tie.

[gfwilliams]

Posted at 2017-01-24 by @gfwilliams

For HID, I meant this: http://www.espruino.com/Puck.js+Keyboard

So Puck.js can do BLE HID directly - once it's set up you just pair it with your PC/Phone/etc and it'll act as a keyboard - you could make your joypad do arrow keys, or WSAD.

Note: right now Windows HID needs the device to be bondable - which Puck.js isn't at the moment - but it should work on most other platforms.

Hope that helps!

[espruino-discuss]

Posted at 2017-01-24 by ChristianW

Thanks.
Consudered it at First, but the counterpart is no PC, Phone etc, but a HM 10 with an Arduino attached.
And I do not know if HM10 copes with HID devices or if it pairs at all...

[gfwilliams]

Posted at 2017-01-25 by @gfwilliams

Ahh sorry - thanks - it all makes more sense now!