Applying voltages higher than 3.3V to any I/O pin could damage the board. The maximum voltage that the I/O pins can tolerate is 3.3V. Warning: Unlike most Arduino boards, the Arduino Due board runs at 3.3V. The Due should be providing 5V to the shield, but the documentation states the following: Update: I just took a closer look at things. Since the LED in the input port is part of the sender's current loop circuit, the 220 &ohm should be fine there (R1), as long as the opposing port is driving it with 5V.\ If you make Rs and R4 each 80 &ohm, then it'll still put 5 mA into the receiver. So we can scale the resistors on the output port to get more current from a 3.3V supply. Since the Due has regulated 5V available, you could use a logic level converter to step the 3.3 up/down to 5V.Ī typical MIDI current loop circuit puts about 5 mA into the LED of the input optoisolator. The first thing to try is just hooking it up. Two MIDI connectors, two trimpots, and three pushbuttons are included with the product and will need to be attached by the end user. Note: The MIDI Shield does not come with all parts soldered on. It also buffers the output, making it compatible with the Arduino Pro without needing to circumvent the protection resistors on the serial TX and RX lines. This revision of the SparkFun MIDI Shield also adds several configurable features, such as converting the MIDI output to a MIDI thru, and the option to use a software serial port for MIDI, leaving the hardware serial for programming and debugging. The RUN/PROG switch allows you to program the Arduino over serial without having to remove the shield. The shield also comes with three momentary push buttons, a reset button, and green and red stat LEDs. Potentiometers are connected to analog pins 1 and 2, and can be used to control volume, pitch, tone or anything else you'd like. The MIDI Shield can be mounted directly on top of an Arduino, connecting the MIDI-IN to the Arduino's hardware RX pin and the MIDI-OUT to TX. The SparkFun MIDI Shield provides an opto-isolated MIDI-IN port as well as a MIDI-OUT port. The MIDI protocol shares many similarities with standard asynchronous serial interfaces, so you can use the UART pins of your Arduino to send and receive MIDI's event messages. The SparkFun MIDI Shield board gives your Arduino-based device access to the antiquated, but still widely used and well supported MIDI communication protocol, so you can control synthesizers, sequencers, and other musical devices.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |