89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
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// High/Low Output LDR Sensor
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// For example: RCWL-0516 (needs 5v input (gnd, vin), 3.3v output level. high for 2seconds when movement detected)
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#include "sensor_ldr.h"
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Sensor_LDR::Sensor_LDR(int p)
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{
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pin=p;
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sensordata data;
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}
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void Sensor_LDR::init() //Things to be done during setup()
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{
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Serial.println("initializing LDR");
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pinMode(pin, INPUT);
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analogRead(pin); //first reading could be false
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init_ok=true;
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}
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//Also called during setup()
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void Sensor_LDR::setSettings(unsigned long senddelaymax, unsigned long readdelay)
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{
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data.senddelaymax=senddelaymax;
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data.readdelay=readdelay;
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}
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//Called during setup
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void Sensor_LDR::advertise(HomieNode& p_sensorNode)
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{
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sensorNode = &p_sensorNode;
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sensorNode->advertise("light");
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}
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void Sensor_LDR::sensorloop()
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{
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if (init_ok) {
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sensordata &d=data;
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bool _changed=false;
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if (millis() >= (d.lastreadtime+d.readdelay)) {
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d.value = get_lux(in_ldr, out_ldr, LDR_ARRAYSIZE)/10.0; //read light level in lux
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if (fabs(d.lastsentvalue-d.value)>=d.minchange){
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_changed=true;
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}
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d.lastreadtime=millis();
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}
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if (_changed || millis() >= (d.lastsent+d.senddelaymax)) {
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Serial.print("Sending LDR. reason=");
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if (_changed) Serial.println("change"); else Serial.println("time");
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Homie.getLogger() << "light " << ": " << d.value << endl;
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sensorNode->setProperty("light").send(String(d.value));
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d.lastsentvalue=d.value;
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d.lastsent=millis();
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}
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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// Calculate lux based on rawADC reading from LDR returns value in lux/10
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//////////////////////////////////////////////////////////////////////////////
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//quelle: https://groups.google.com/forum/#!topic/souliss/1kMAltPB2ME[1-25]
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int Sensor_LDR::get_lux(const unsigned int* _in, const unsigned int* _out, byte size)
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{
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// take care the value is within range
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// val = constrain(val, _in[0], _in[size-1]);
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unsigned int val = analogRead(pin);
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#ifdef DEBUG //DEBUG++++++++++++++++
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Serial.print("LDR RAW=: ");
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Serial.println(val);
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#endif
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if (val <= _in[0]) return _out[0];
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if (val >= _in[size-1]) return _out[size-1];
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// search right interval
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byte pos = 1; // _in[0] allready tested
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while(val > _in[pos]) pos++;
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// this will handle all exact "points" in the _in array
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if (val == _in[pos]) return _out[pos];
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// interpolate in the right segment for the rest
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return map(val, _in[pos-1], _in[pos], _out[pos-1], _out[pos]);
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}
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