Pulse skip modulation (PSM) code for Arduino
This project explores ways to manipulate vibe pump flow using simple components.
The basic setup consists of an Arduino Nano board and AC Dimmer board with an AC phase sensing circuit.
Most popular AC Dimmer boards have a bridge rectifier that allows zero-crossing detection. This project requires modification of such board by replacing bridge rectifier with a diode, so the circuit detects full negative part of AC wave.
UPDATE: The requirement of the replacement of the bridge with a diode can be dropped if the code accounts for two impulses per period and keeps the TRIAC open for the full duration of it.
Each time a negative half-wave is detected, the code calculates whether the next positive pulse has to be skipped, and sets a TRIAC control output accordingly.