# Battery powered Zynthian with build in keyboard

**URL:** <https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356>\
**Category:** Building Zynthian\
**Created:** [November 18, 2017, 2:51am UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356 "2017-11-18T02:51:44Z")\
**Posts on this page:** 20\
**Page:** 4

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 25, 2017, 12:29pm UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/61 "2017-11-25T12:29:13Z")

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Here is new schematic. I hope it is schematic of working electrical circuit because I have done many hours of work for it.

 ![teensy schematic 2](https://discourse.zynthian.org/uploads/default/original/2X/2/2edad27a5c61058565fa31cf2c113ed7c33949db.png)

Edit. I found few mistakes but nothing super big. I corrected them.  
Edit2. Thanks to Sparkfun irc channel I found out that my pull up resistors are connected wrong.

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 25, 2017, 8:11pm UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/62 "2017-11-25T20:11:23Z")

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Here is 3d rendering of PCB. 🙂 I will use connectors that have lock feature.

 ![74HC4067 3d](https://discourse.zynthian.org/uploads/default/original/2X/a/ae636a5b0262a65cf3b4ee908d2c08dac0dbf15f.png)

Edit. I added decoupling capacitors to mux chips as I just learned about them.

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 26, 2017, 2:02am UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/63 "2017-11-26T02:02:10Z")

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I have redesigned WS2811 PCB. I did incorporate rotary encoder to it.

 ![WS2811 schematic 3d](https://discourse.zynthian.org/uploads/default/original/2X/8/8bd9b080d132ec8543bd8b0543eb52d024a2347b.png)

Edit.  
Oh yeah. I forgot that I have to fit 16 of these pretty close to each other. I need to redesign it again.  
They need to be so close in fact that it is smarter to make one big PCB instead of many smaler ones.

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 26, 2017, 4:07pm UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/64 "2017-11-26T16:07:54Z")

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Here is schematic and picture of 3d model of new PCB. I will use 2 of these.  
There will be 8 rotary encoders on backside and those 16 connectors are for drumpad leds and force sensitive resistors.  
Big row of pins is for connections to teensy board. I will redesign it so that it has 4 rows of headers. 2 rows for each FSR/led/Encoder PCB.  
I have not made connections so there is no tracks in picture. I will make mounting holes later.

 ![schematic](https://discourse.zynthian.org/uploads/default/original/2X/a/ae657d12411e2b5147948cdc3344fc52379df91c.png) ![PCB](https://discourse.zynthian.org/uploads/default/original/2X/3/304b920cb799976ed9bad6a11b6a2203d7a4ffa0.jpg)

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 26, 2017, 7:09pm UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/65 "2017-11-26T19:09:50Z")

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It is done. I had to make board little bit bigger so that I can fit tracks. I hope there was no mistakes in schematic. 😄

 ![tracks](https://discourse.zynthian.org/uploads/default/original/2X/9/968df0a28fd91b10816d42df91cb616deef0f1ca.png)

Now I will go and redesign that Teensy board.

Edit.  
Oh and I made little change to schematic. because of this.

 ![syy](https://discourse.zynthian.org/uploads/default/original/2X/2/216391822ed98cb8dcaed941491dd358a375f0f3.png)  
I transfered bottom part up so that I could make connections closer.  
 ![seuraus](https://discourse.zynthian.org/uploads/default/original/2X/2/24aab6898be574155c2482e67d3a001bc5dc2dc7.png)

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 27, 2017, 9:10am UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/66 "2017-11-27T09:10:13Z")

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I have noticed one mistake in that fsr/led/re PCB schematic.😫 I have connected FSRs to GND and not to analog GND. I will go and re do whole PCB. While I am at it I will transfer pullup resistors to PCB that Teensy is connected. I hope I can finish these PCBs today and this is last iteration of PCBs.

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 27, 2017, 2:39pm UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/67 "2017-11-27T14:39:18Z")

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I have finished PCB that Teensy is connected to. Damn if there is still some mistakes.

 ![teensy PCB v3](https://discourse.zynthian.org/uploads/default/original/2X/a/a2686f3b6fdac8ef055ba5b1aada808c5e91638d.jpg)  
 ![teensy PCB tracks v3](https://discourse.zynthian.org/uploads/default/original/2X/0/0e2b23b51702ddbbb8dbd6954e3883792a2bf561.png)

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 27, 2017, 6:11pm UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/68 "2017-11-27T18:11:17Z")

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Here is another PCB. I realy realy hope that there is no mistakes and I can send files to OSH Park soon.

 ![ws2811PCB3](https://discourse.zynthian.org/uploads/default/original/2X/3/314012ccb0652cf75d6d4f71708b8adca7392531.jpg)  
 ![WS2811 tracks](https://discourse.zynthian.org/uploads/default/original/2X/8/8cff7ce7db6af75ec88dd0a88b99f09a405a1f6b.png)

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 28, 2017, 5:03am UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/69 "2017-11-28T05:03:32Z")

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I think that I go with dirtyPCB for PCB manufacturing as it it cheapest I have found. I will check schematics again few times on different days just to be sure that there is no mistakes before I send files to dirtyPCB.

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**Author:** ![jofemodo](https://discourse.zynthian.org/user_avatar/discourse.zynthian.org/jofemodo/32/2_2.png) [@jofemodo](https://discourse.zynthian.org/u/jofemodo)\
**Post date:** [November 28, 2017, 10:39am UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/70 "2017-11-28T10:39:20Z")

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You are really doing a nice work, @Aleksi!  
I’m very curious to see your zynthian finished 😉

Regards,

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 28, 2017, 12:41pm UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/71 "2017-11-28T12:41:00Z")

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@jofemodo

Thanks alot! You can belive me I am also. 🙂

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 29, 2017, 8:58am UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/72 "2017-11-29T08:58:09Z")

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I knew that there is still some mistake somewhere. Left side connector is from FSR/LED/RE PCB and right is from Teensy PCB. Pins 36 and from 1 to 19 are OK everything else is upside down. ☹

 ![huomaatko eron](https://discourse.zynthian.org/uploads/default/original/2X/f/f7836d28b201dc7b955c9917ac8e477ecca82d06.png)

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 30, 2017, 6:24pm UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/73 "2017-11-30T18:24:26Z")

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I have redone PCB that has rotary encoders, connectors for leds and force sensitive resistors.  
As you can see I have moved connector to left. This is so that I can put PCB that has Teensy connected to it left as possible inside synth body. Before I would had to put it more to center and it could take too much space. Maybe it was good thing that that connector had pins upside down.

 ![controller PCB tracks](https://discourse.zynthian.org/uploads/default/original/2X/6/6513ea6cf68de1e2e109edaea36d9b288f46d09a.png)  
 ![controller PCB](https://discourse.zynthian.org/uploads/default/original/2X/0/00ec96c4f68e39e0575c64cf70f13540af3f9baf.jpg)

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**Author:** ![christianforshaw](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/c/65b543/32.png) [@christianforshaw](https://discourse.zynthian.org/u/christianforshaw)\
**Post date:** [November 30, 2017, 6:29pm UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/74 "2017-11-30T18:29:24Z")

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aleksi , so I know your in finland, what do you do in finland  
this project will cost atleast 2 of your arms and maybe one of your legs , finland prices 🙂

id like to keep in contact with you as I’m in finland also, I’m a brit though and moved here a long long time ago

I guess your from Russia going by your name ?

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [November 30, 2017, 6:45pm UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/75 "2017-11-30T18:45:32Z")

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Mosty I waste time. I dont have job or school to study in. I am trying to get inside univeristy to study natural sciences, mathematics or compuer science but it is hard as I have only car mechanic studies behind me. Maybe next year I get in through Helsinki universitys programming MOOC.

It would be nice to stay in touch as I dont have lot of friends.

Why did you move here? Because of work or some lady?

No, I am fully finnish.

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [December 1, 2017, 8:09am UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/76 "2017-12-01T08:09:48Z")

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I think that I have found better power supply than that one I posted before as you can buy one of these ready to use. [Here is link to it](http://www.pimodulescart.com/shop/item.aspx?itemid=29). It is called UPS PIco and there is 2.5A and 3A versions available. You can use LiPO or PLiFePO4 batteries with it.

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**Author:** ![mheidt](https://discourse.zynthian.org/user_avatar/discourse.zynthian.org/mheidt/32/773_2.png) [@mheidt](https://discourse.zynthian.org/u/mheidt)\
**Post date:** [December 1, 2017, 8:17am UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/77 "2017-12-01T08:17:29Z")

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and you really think, that the zynthian will be less than 900EUR? 😛

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [December 1, 2017, 8:38am UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/78 "2017-12-01T08:38:13Z")

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I am not sure any more. 😃

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**Author:** ![mheidt](https://discourse.zynthian.org/user_avatar/discourse.zynthian.org/mheidt/32/773_2.png) [@mheidt](https://discourse.zynthian.org/u/mheidt)\
**Post date:** [December 1, 2017, 8:45am UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/79 "2017-12-01T08:45:35Z")

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I would concentrate on this tenzy board first.  
Let’s make that board and we enhance the zynthian software so that it can handle more than the known 4 knobs.  
Baby steps is the secret 🙂

or what is your opinion, @jofemodo?

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**Author:** ![Aleksi](https://discourse.zynthian.org/letter_avatar_proxy/v4/letter/a/ecc23a/32.png) [@Aleksi](https://discourse.zynthian.org/u/Aleksi)\
**Post date:** [December 1, 2017, 8:48am UTC](https://discourse.zynthian.org/t/battery-powered-zynthian-with-build-in-keyboard/1356/80 "2017-12-01T08:48:49Z")

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You are right. I should concentrate on it first and get it working before I think about battery power.

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