• Pulse Width Modulation
  • Cycling a electrical current on and off for a specific time length.
  • Spray nozzles are turned on and off at 10 times a second.
  • The length of time that the solenoid is on for that 1/10 of a second is calculated with feedback given to the microcontroller from a pressure transducer.
  • If the pressure is too low the duty cycle of the solenoid is lowered to increase the pressure.
  • If it too high the duty cycle is raised to lower pressure.

Oscilloscope screen shots from the display

80 % Duty Cycle

80% Duty Cycle

50 % Duty Cycle

50 % Duty Cycle

10 % Duty Cycle

10 % Duty Cycle