Editor Version ×
Standard

1.Easy to use and quick to get started

2.The process supports design scales of 300 devices or 1000 pads

3.Supports simple circuit simulation

4.For students, teachers, creators

Profession

1.Brand new interactions and interfaces

2.Smooth support for design sizes of over 30,000 devices or 100,000 pads

3.More rigorous design constraints, more standardized processes

4.For enterprises, more professional users

STD Smart MIDI box

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License: CC-BY 3.0

Creation time: 2020-01-25 05:08:03
Update time: 2021-04-07 03:40:18
Description
(still work in progress, not fully tested) A smart MIDI box based on a STM32 "blue pill" microcontroller (STM32F103C8T6). Software is hosted on Github: https://github.com/retro16/MidiBox Uses a HD44780 16x2 LCD screen with the usual I2C converter. The interface is made of 4 push buttons arranged in a directional pad (up, down, left, right). A SD card can be attached for more features. Optional parts -------------- Some parts on the PCB are optional, depending on what you wish to do with the board. * To remove MIDI IN 1, omit R1, R2, D1 and U1. * To remove MIDI OUT 1, omit R3, R4, R5, R6, Q1 and Q2. * To remove MIDI IN 2, omit R7, R8, D2 and U3. * To remove MIDI OUT 2, omit R9, R10, R11, R12, Q3 and Q4. ### Optional SD, LCD and buttons. If you remove the SD card, the LCD screen and buttons, all MIDI messages will be routed to the first MIDI output. It acts like a buffered MIDI merger. MIDI port extenders can be used in that configuration. Building a multiplexed extender ------------------------------- * Build the same PCB as the main board * Omit SD, LCD and buttons as they are unused * Place a jumper on EXT (or link LT and RT pins together). * Set AH and AM to either open or closed to select the 2 MIDI ports it will route (use 0 ohm 0805 resistors or just solder a piece of wire between the pads). Each extender must have a different AH/AM combination. * Connect "EXT TX" of the main board to "EXT RX" of the extender * Connect "EXT TX" of the extender to "EXT RX" of the next extender, and so on and so forth (up to 4 extenders, order is not important) * Connect "EXT TX" of the last extender to "EXT RX" of the main board
Design Drawing
schematic diagram
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PCB
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ID Name Designator Footprint Quantity
1 POWER P1 HDR-TH_2P-P2.54-V-M 1
2 MUX P2 HDR-TH_2P-P2.54-V-M 1
3 1N4448 D1,D2 DO-35 2
4 BC547B Q1,Q2,Q3,Q4 TO-92_3PIN-L4.95-W3.94-PITCH2.54-L 4
5 MIDI1 IN H2 HDR-TH_3P-P2.54-V 1
6 MIDI1 OUT H4 HDR-TH_3P-P2.54-V 1
7 MIDI2 IN H5 HDR-TH_3P-P2.54-V 1
8 MIDI2 OUT H6 HDR-TH_3P-P2.54-V 1
9 100u C1 1206 1
10 BTN H1 HDR-5X1/2.54 1
11 6N137EE U1,U3 DIP8 2
12 BluePill P5 BLUEPILL 1
13 LCD H3 DIP-1X4P2.54 1
14 100n C2 0805 1
15 SD P4 HDR-8X1/2.54 1
16 MIDI UART H7 HDR-F-2.54_1X4 1
17 10k R3,R1,R6,R9,R7,R12 0805 6
18 220 R2,R4,R5,R8,R10,R11 0805 6
19 ADDR_H J1 0805 1
20 ADDR_M J2 0805 1
21 EXT_EN J3 0805 1

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