sensoresp/include/sensor_hcsr501.cpp

// PIR Sensors HC-SR501
// pir sensor needs 5v through an inductor for filtering. output level is 3.3v
// 100nF capacitor should be soldered between pins 12 and 13 of BISS0001 to stop interference from esp causing false triggers (in some setups). source: https://www.letscontrolit.com/forum/viewtopic.php?t=671
// hc-sr501 should also be a few cm away from the esp. interference can cause false triggering
// poti closer to jumper is sensitivity (cw increases). other poti is pulse time (cw increases).
// Set jumper to inner position (closer to IC)
// time set to output around 30s pulse
// pinout is Vin, Signal, GND. Vin pin is closest to diode
#include "sensor_hcsr501.h"


Sensor_HCSR501::Sensor_HCSR501(int pin)
{
  hcsr501pin=pin;
}

void Sensor_HCSR501::init() //Things to be done during setup()
{    
  Serial.println("initializing HCSR501");
  pinMode(hcsr501pin, INPUT_PULLUP);
  init_ok=true;     
}

//Also called during setup()
void Sensor_HCSR501::setSettings(unsigned long senddelaymax, unsigned long readdelay)
{
    data.senddelaymax=senddelaymax;
    data.readdelay=readdelay;
}

//Called during setup
void Sensor_HCSR501::advertise(HomieNode& p_sensorNode)
{
    sensorNode = &p_sensorNode;
    sensorNode->advertise("motion");
}

void Sensor_HCSR501::sensorloop()
{
  if (init_ok) {
    sensordata &d=data;
    bool _changed=false;
    if (millis() >= (d.lastreadtime+d.readdelay)) {
      if (digitalRead(hcsr501pin) != (d.value>0)){
        _changed=true;
      }
      d.lastreadtime=millis();
    }
    if (_changed || millis() >= (d.lastsent+d.senddelaymax)) { //send current value after some long time
      Serial.print("Sending motion. reason=");
      if (_changed) Serial.println("change"); else Serial.println("time");

      if (digitalRead(hcsr501pin)){
        Homie.getLogger() << "motion " << ": " << "true" << endl;
        sensorNode->setProperty("motion").send(String("true"));
        d.value=true;
      }else{
        Homie.getLogger() << "motion " << ": " << "false" << endl;
        sensorNode->setProperty("motion").send(String("false"));
        d.value=false;
      }
      d.lastsent=millis();
    }
  }
}