74LS574 ULN2803 PIC16F84 ile 32 Çıkış Midi Dekoder

PIC16F84 32 outputs MIDI Decoder

Here is the description a 32 outputs MIDI able to switch relays, electromagnetics devices… in order to automate a mechanical musical instrument, or command lights…

MIDI datas from a musical instrument equipped with an MIDI output or from a sound card of a computer
are analyzed by the software present on the PIV 16F84.

Optocouplor IC10 (1N136) ensures the galvanic insulation.
The outputs of PortB form a 8 bits parallel bus data towards the four 74LS574 (8 Latches),
the outputs of PortA 1,2,3,4 order the memorizing of these 74LS574
Buffers ULN2803 make it possible to control loads until 2 A .
The power supply 5V is articulated around a regulator 7805.
Connector CN7 receives the power supply from 9 to 24v according to the type of relay or electromagnet.