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127 lines
4.6 KiB
Markdown
127 lines
4.6 KiB
Markdown
# mt32-pi-midi-hat
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A Raspberry Pi Midi Hat for the project mt32-pi by Dale Whinham (https://github.com/dwhinham/mt32-pi).
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This PCB is designed from the schematic available from the above project.
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The Gerbers have been created from the recommendations at JLCPCB.
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(https://support.jlcpcb.com/article/102-kicad-515---generating-gerber-and-drill-files)
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You may need to re-generate for your chosen PCB Manufacturer
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Version 1.7.2 Copyright 2021 Chrissy
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* Moved a trace that was too close to the mounting screw hole. Could cause a short if over tighten to expose the trace. (see https://github.com/chris-jh/mt32-pi-midi-hat/issues/3)
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Version 1.7.1 Copyright 2021 Chrissy
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* Moved the Midi-Din slightly
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Version 1.7 Copyright 2021 Chrissy
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* Fixed Silk Screen error on buttons for mt32/sf and Synth, they were opposite
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Version 1.6 Copyright 2021 Chrissy
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* Removed Hitachi HD44780 4 bit connection, use i2c version
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* Added control pins and buttons, see (https://github.com/dwhinham/mt32-pi/wiki/Control-surface)
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## Audio DAC's
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I designed this Hat to accommodate 2 different PCM5102 DAC boards that are available from Amazon or eBay.
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***GY-PCM5102***
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***CJMCU-5102***
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Currently the GY-PCM5102 version seems to be the most popular on Amazon and eBay, just search for PCM5102.
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## Screen's
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**SSD1306 OLED**
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The Hat can take either the 128x32 SSD1306 OLED, or the 128x64 SSD1306 OLED
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***SSD1306 OLED 128x32***
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***SSD1306 OLED 128x64***
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Again both screens are available from Amazon or eBay.
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The 128x64 OLED connects on the board at this position here.
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You will need to put some none conductive material under the OLED,<br>so it does not short agains the Pins of the Raspberry Pi.
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When you buy your screen, make sure the PIN order is as follow's (left to right, looking down on the screen):-
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| 1 | 2 | 3 | 4 |
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|---|---|---|---|
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|GND|VCC|SCL|SDA|
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You can see this in the photo above.
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Some SSD1306 OLED's have Pins 1 and 2 swapped, which will be bad. So please double check.
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***Hitachi HD44780***
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[<img width="100rem" align="right" src="pics/Hitachi_HD44780.jpg">](pics/Hitachi_HD44780.jpg)
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There are two versions of this screen, one that communicates via the i2c (like the above OLEDS) or a direct connection.
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I have removed the direction connection from v1.6 to give enough room to fit the control buttons.
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Use the i2c version only and you will need to connect the screen to one of the OLED connections J2 or J3 on the PCB.
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The Hitachi screen can also come in different sizes, ideally you want one that is 20 characters in length and either 2 or 4 lines.
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<br>
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### Configuration
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Please see the main mt32-pi Project (https://github.com/dwhinham/mt32-pi) on how to configure and use your screen and DAC.
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### BOM
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| Reference | Value | Quantity | URL |
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|-----------|-------|----------|-----|
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| C1 | 100nf | 1 | https://www.mouser.co.uk/ProductDetail/Murata-Electronics/RCER71E104K0K1H03B?qs=Ey7%2FXF42M3ci4g3t0g7SIw%3D%3D |
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| R1 | 220Ω | 1 | https://www.mouser.co.uk/ProductDetail/Vishay-Beyschlag/MBB02070C2200FCT00?qs=PwR17mNzlcOWyOoLtTQfsw%3D%3D |
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| R2 | 1KΩ 5% | 1 | https://www.mouser.co.uk/ProductDetail/Vishay-Dale/CCF071K00JKE36?qs=NQWA6AwZmkMdaaeOGvuguw%3D%3D |
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| D1 | 1N4148 | 1 | https://www.mouser.co.uk/ProductDetail/ON-Semiconductor-Fairchild/1N4148?qs=i4Fj9T%2FoRm8RMUhj5DeFQg%3D%3D |
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| U1 | H11L1 | 1 | https://www.mouser.co.uk/ProductDetail/ON-Semiconductor-Fairchild/H11L1M?qs=P36CEcFBmYxn5ViwkIckpw%3D%3D |
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| J1 | DIN-5 | 1 | https://www.mouser.co.uk/ProductDetail/490-SDS-50J |
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| J2 or J3 | SSD1306 OLED | 1 | Amazon or eBay |
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| J4 or J5 | DAC GY-PCM5102<br>or<br>CJMCU-5102 | 1 | Amazon or eBay |
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| J6 | External Button Pin Header 1x6 | 1 | Amazon or eBay |
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| SW1,2,3,4 | Tact Switch 6x6mm | 4 | Amazon or eBay |
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| Pi | Header| 1 | https://www.mouser.co.uk/ProductDetail/Samtec/SSQ-120-23-G-D?qs=rU5fayqh%252BE1BMVd%252BDZONqg%3D%3D |
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You may want to get some general Pin Headers 2.54mm, only 1 extra pin is used to stabilise the DAC's for when pushing in the headphone jack.
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[**THT Interactive BOM**][IBOMTHT1_6]
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## !!!!! WARNING !!!!!
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Use at your own risk. I accept no responsibility if this damages any of your equipment.
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[IBOMTHT1_6]: http://htmlpreview.github.io/?https://raw.githubusercontent.com/chris-jh/mt32-pi-midi-hat/main/bom/mt32-pi-midi-hat_bom_v1_6.html
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