The three stomps and the encoder (with its button) are not currently assigned to any function.Otherwise, the state can be used to determine which message should be sent among a set of two messages, like an on/off button. If a single message needs to be sent at the time of a pressure, the change of state is used to trigger a single message. The stomps, instead, can be in two positions only, and are connected to a single digital pin. Switch 6 is not currently assigned to any function.Switch 5 routes the MIDI messages generated with pedal 2 to MIDI output 1 or 2, or to both.Switch 4 routes the MIDI messages generated with pedal 1 to MIDI output 1 or 2, or to both.Switch 3 selects the digital or analog behaviour of pedal 2.Switch 2 routes the MIDI input 2 to output 1, to output 2, or to none.Switch number 1 routes the MIDI input 1 to output 1, to output 2, or to both.In this way three possible states are possible. They can never be in HIGH state at the same time, due to the design of the connections. If one of them is HIGH, the corresponding setting is selected. In this position, both the digital reads are LOW. ![]() ![]() The switches can be in three positions so that they can deliver the 5V to one of the pins or to none of them when they are in the central position. However, they are not active at the moment.Īll switches but two, are connected to two digital pins. I included the encoder and the stomp pedals since I plan to give them a function like changing settings from a list and sending program change messages. The green and red leds are activated by note on and note off messages respectively, while the blue led is triggered by pitch bend messages, which are the majority of the MIDI messages sent by the ARKeytar, and by control change messages. The merger also presents three LEDs for analyzing the type of the incoming MIDI messages. A reduced number of channels was used in this way. This was useful mainly to simplify the connection between the front panel and the Arduino Mega, which is screwed to the base. Moreover, additional MIDI messages, like program change messages can be generated with three stomp switches.Īll the switches are connected to the Arduino using a pair of shift registers. For the same reason, a digital encoder is present. The Arduino merges the routed incoming messages together with the ones generated following to the pedals action.Īn additional switch is present to add some generic setting that can be assigned by editing the code in Arduino IDE. The control change destination can be programmed, and the destination MIDI output port can be selected, for each pedal, using switches on the top panel. Once the pedals states are read, MIDI messages are generated if changes happened. Now, by simply moving two switches, I can configure the routing of my MIDI devices. ![]() The routing of MIDI input 2 includes the possibility not to forward the generated messages, since the connected keyboard can be used to control only its internal sounds, instead of controlling some VST software. The MIDI input 1 can be sent to one of the MIDI outputs or to both of them, while the MIDI input 2 can be sent to one of the MIDI outputs or to none of them. By means of two SPDT (single-pole double-throw) switches with three positions, one can tell the Arduino the destination MIDI output port for each of the two MIDI inputs. The idea is to keep the ARKeytar MIDI controller and my keyboard synth connected to the MIDI input of the merger, while the two MIDI outputs are directed towards the keyboard synth and the audio-MIDI interface. Given the need of managing two serial ports (two MIDI inputs, and two MIDI outputs), the Arduino Mega board was chosen since, unlike the Arduino Uno, it is able to manage more than one serial port.
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