I am trying to operate relay based on LDR reading and potentiometer use to adjust the Day and Night thresholds. I try to cover following two logics:
1 ) On and off at two different set point. Like Relay ON at 70% and OFF at 20% darkness.
2) Hold for few second and than react. Like when detect darkness hold 3 sec if still dark than relay ON / OFF.
Below is my so-called sketch.
Its working as expected. only there is confusion in day and night logic its work opposite.
Alternate solution and modification also welcome.
const int Relay_Pin = 2; // the number of the LED pin
int inputPin_Day = A0;
const int numReadings = 50;
unsigned long TimeOfLastPower_Day = 0; // Globals default to zero but making it explicit is not harmful
unsigned long TimeOfLastPower_Night = 0; // Globals default to zero but making it explicit is not harmful
int LL = A1;
int HH = A2;
int LL_Value = 0; // variable to store the value coming from the sensor
int HH_Value = 0; // variable to store the value coming from the sensor
bool Day;
bool Night;
int readings_DAY[numReadings]; // the readings from the analog input
int readIndex_Day = 0; // the index of the current reading
int total = 0; // the running total
int average = 0; // the average
int Re_Scale = 0;
int PotVal_Day = 0;
int PotVal_Night = 0;
boolean logic = 0;
void setup() {
Serial.begin(9600);
pinMode(Relay_Pin, OUTPUT);
for (int thisReading = 0; thisReading < numReadings; thisReading++) {
readings_DAY[thisReading] = 0;
}
}
void loop() {
LL_Value = analogRead(LL);
int PotVal_Day = 0;
PotVal_Day = map(LL_Value, 0, 1023, 0, 100);
HH_Value = analogRead(HH);
PotVal_Night = map(HH_Value, 0, 1023, 0, 100);
total = total - readings_DAY[readIndex_Day];
readings_DAY[readIndex_Day] = analogRead(inputPin_Day);
total = total + readings_DAY[readIndex_Day];
readIndex_Day = readIndex_Day + 1;
if (readIndex_Day >= numReadings) {
readIndex_Day = 0;
}
average = total / numReadings;
Re_Scale = map(average, 0, 1023, 0, 100);
////////////////////------------------------/////////////////
if (Re_Scale >= PotVal_Day) {
TimeOfLastPower_Day = millis();
}
// Has it been more than 30 seconds since we last saw power?
if (millis() - TimeOfLastPower_Day > 3000UL) {
Night = true;
// Turn on the relay
} else {
Night = false;
}
if (Re_Scale <= PotVal_Night) {
TimeOfLastPower_Night = millis();
}
if (millis() - TimeOfLastPower_Night > 3000UL) {
Day = true;
} else {
Day = false;
}
Serial.print("D : ");
Serial.print(PotVal_Day);
Serial.print(" ");
Serial.print("N : ");
Serial.print(PotVal_Night);
Serial.print(" ");
Serial.print(" LDR : ");
Serial.print(Re_Scale);
Serial.print(" ");
if (Night || Day) {
if (Re_Scale >= PotVal_Day && logic == 0) { // Night detect
LightON();
logic = 1;
} else if (Re_Scale >= PotVal_Day && logic == 1) {
LightON();
} else if (Re_Scale <= PotVal_Night) { // Day Detect
LightOFF();
logic = 0;
}
}
Serial.println(" ");
}
///////////////////////--------------------------------/////////////////////////////////////
void LightON() {
digitalWrite(Relay_Pin, HIGH); // Many relay modules are Active Low
Serial.print(" : ");
Serial.print("Night");
}
void LightOFF() {
digitalWrite(Relay_Pin, LOW); // Many relay modules are Active Low
Serial.print(" : ");
Serial.print("Day");
}
Serial output as :
N : 48 D : 40 LDR : 57 : Night
N : 48 D : 40 LDR : 55 : Night
N : 48 D : 40 LDR : 53 : Night
N : 48 D : 40 LDR : 50 : Night
N : 48 D : 40 LDR : 48 : Night
N : 48 D : 40 LDR : 46
N : 48 D : 40 LDR : 43
N : 48 D : 40 LDR : 41
N : 48 D : 40 LDR : 39
N : 48 D : 40 LDR : 38
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37 // 3 Sec serial cut
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37
N : 48 D : 40 LDR : 37 : Day
N : 48 D : 40 LDR : 37 : Day
N : 48 D : 40 LDR : 37 : Day
N : 48 D : 40 LDR : 37 : Day
N : 48 D : 40 LDR : 37 : Day
N : 48 D : 40 LDR : 37 : Day
