This week we started working with the relay board, the pneumatic solenoid and the arduino, which make up the majority of the air supply release system. Using an example blink function pre-programmed into the arduino we were able to test the opening and closing of the solenoid once properly wired to the relay board. The circuit is temporarily powered by a 12 volt, 4 amp power supply. Now that the circuit is set up, we are now able to determine the maximum speed that the pneumatic solenoid will be able to open and close, thus releasing air into the instrument. The speed of firing for the solenoid was pretty fast and the circuit therefore has an electrical capacity to play any possible note duration for any given song. What we have this week is a solid working proof of concept, and is a promising step forward in the circuit design because it shows that the original circuit diagram (that you should include in last weeks post) is feasible.