2022年12月3日 · Given that the MIDI baud rate is 31,250 Bauds then you can see how the 4n35 is not fast enough for MIDI. The MIDI hardware specification recommends using a PC900V or a 6N138 / 6N139 which is described as a 100,000 Baud capable opto isolator.

2017年7月3日 · If you really want to use the 4N35, then it is possible to speed it up by adding a transistor as an amplifer with a lower input impedance: But the simplest method to get the MIDI input to work would be to use a high-speed optocoupler like the H11L1 or 6N137.

The circuit consists in 8 standard MIDI inputs and 1 MIDI output, rated for 3.3V. It's powered by the Raspberry Pi Pico via USB that provides 3.3V. MIDI IN 1-8 are connected to GPIO2-9. MIDI OUT is connected to UART0 TX (GPIO0). The MIDI inputs are built around the 4N35 optocoupler.

2024年7月3日 · I have an ESP32 D1 Mini, two MIDI connectors and an 4N35 optocoupler. Also, I use a 12V power source with a 5V step down. How can I use these in order to receive/send MIDI signals?

This instructable shows how to build a shield to connect devices that send MIDI signals (e.g. a masterkeyboard) to an Arduino. The basic schematic is derived from: http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1187962258/

2024年11月27日 · See 5 Pin DIN Electrical Specs – MIDI.org for the official resistor values for 3.3V logic. Alternatively, use a 5V buffer for the MIDI output and use the standard 5V resistor values.

4N35 是一款适用于一般应用的 光耦合器，由一个 红外 LED 灯 和一个 NPN 光电晶体管 组成。 4N35 使用 6 引脚 DIP 封装。 响应时间通常为 3 µs，输入电流为 10 mA 时的最小 CTR 为 100%。 要使用 4N35 非常简单，就像上面说的， 4N35 包含两个部分或组件，一个 IRLED 和一个光电晶体管。 LED 阳极引脚可以连接到你正在操作或工作的设备（例如任何 IC 或微控制器）的输出和阴极 LED 的引脚应与该设备的接地连接，就和正常的 LED 一样。

2016年6月14日 · When the 4N35 turned off the arduino PIN2 is connected to +5V through the 1k resistor, once it opens it would connect pin2 directly to the GND. The problem is that once this is done it will not go back to the previous state. \$\endgroup\$ –

2015年8月10日 · the 4N35 is too slow to work reliably with MIDI signals. Below is an updated schematic that uses a faster opto-coupler. Admittedly the 4N35 is below spec for its rise time (it is supposed to be less than 2 μs rise time, however the 4N35 is slower at between 3 µs and 7 µs). However during my testing it worked OK.

MIDI TO ARDUINO: This is already part of some of my Instructables, but probably hard to find via the search function. It is used in the following Instructables: Micro Timelapse Dolly with DC motors: https://www.instructables.com/id/MICRO-ARDUINO-GOPR...