A three-way solenoid valve controls the pneumatic system. When the signal of the solenoid and air pump are high, air generated from air pump flows into the silicon rubber to inflate the mask; when the signal of the solenoid is low, the air inside silicon rubber flows out from the valve to deflate. The inflation-deflation rate is determined by the light intensity sensed by the two light sensors. The higher the intensity, the faster the mask breathes. The double-sided PCB is designed with EAGLE and milled with Bantam Tools desktop milling machine.
Materials
The double-sided PCB is designed with EAGLE.
Then milled with Bantam Tools desktop milling machine.
Soldered together.
