Today
solved a few problems with the power that came to the solenoids, for example, each solenoid pressure exerted was terribly small when one solenoid is activated at the same time. As you can guess, because this action is very common to play the piano, it becomes a pretty big problem.
To resolve this problem and achieve good control over each of the solenoids that will play the musical notes implemented the following circuit:
To resolve this problem and achieve good control over each of the solenoids that will play the musical notes implemented the following circuit:
Electronic Chart Activation of each solenoid. The design is a pair of transistors in Darlington configuration . The base of the first transistor, a 2N2222A, is activated by a pin PIC microcontroller output through a resistance of 100 Ohms. Establishing a low impedance path between the emitter and collector which activates a second transistor, a TIP41C. Finally, it creates a low impedance path between the emitter and collector to activate the solenoid, and generate the movement required to activate the desired key.
Thanks to all this, we test the "right hand" of Orcobot and with the keyboard, the result is the following:
Orcobot - Black Dragon (Luca Turilli Cover)
Finally, we ordered a bit of wiring hell that was among the eight solenoids that are tested and the master microcontroller.
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