My room on campus has an aquarium, however, I am not in my room the majority of the day so I either leave the light on all day or just leave it off. This also happens on weekends that I am not on campus, the light stays on for almost three days. This isn't really a big deal, but with this project, I no longer have to manually switch the lights on and off ever again.
How it Works:
The argon attached to the aquarium uses inputs from a photo-resistor and a time function. The time function is essentially called from the cloud because the argon is connected to the internet via wifi. During the hours of 8 a.m. to 9 p.m., the argon knows that one criteria for the light is met. The other criteria is the detected current value from the photo-resistor. If the value is under a predetermined value then the second criteria is met and the aquarium light turns on. If the time is not within the specified bounds, the light is off. If the detected value is greater than the predetermined value, the light is off. Another important input to note is that in its initial state the circuit is not active and argon is not using any inputs, the light is just off. The circuit gets turned on when a button attached to a second argon is pressed. This publishes an event turning the aquarium argon on. The second argon also displays the status of the aquarium argon in real-time. If the LED is red, the aquarium light is on, if it's yellow the light is off, and if the D7 light is on but the LED is off then the circuit is in an "off" state. When the circuit is active during the specified hours, the aquarium argon publishes the sensor value so that ThingSpeak can graph it in real-time.
Things to Note:
1. Using tinker to determine the sensitivity and light on values for the photo-resistor is the absolute first step.
2. The photo-resistor, in my case, flipped before filming. Before filming, values were shown at about 3500 with no lights, and under 2500 with lights on. As of filming, the values read 900+ for lights on and under 700 for no lights on.
3. The sensing argon code shows what appears to be several repeats in the code. This is because > and < symbols in the didn't turn off the light but the = sign did when the set time was reached. This is the only way I found to get the time function to work correctly.
ThingSpeak
Shows the sensor values graphed by ThingSpeak. Dips indicate time when the aquarium light was on. Rises represent when the aquarium light was off.
Code for the Sensor argon which turns the light on and off based on predetermined conditions.
intlight=A4;intsensor=A0;intstatus=D7;intdetect=0;constinteasternzone=-5;// Constant for Eastern time zoneboolcircuit_status=false;// Circuit state is off until an event is published by the other argon.voidsetup(){Serial.begin(9600);//Hardware setuppinMode(status,OUTPUT);//Pin DeclarationspinMode(light,OUTPUT);pinMode(sensor,INPUT);Time.zone(-5);//Constant for the eastern time zone, makes inputing time constraints much easierParticle.subscribe("circuit",circuit_stat,MY_DEVICES);//Subscribing to the event the other argon publishes when the button is pushed}voidloop(){detect=analogRead(sensor);// Setup for sensor value, states that the detect value is the analogRead value captured from the sensorif(detect>=700&&circuit_status==true){//If the value is greater than the 700, there is sufficient light in the room and the light turns off. An event is published telling the other argon the light is off.digitalWrite(light,LOW);Particle.publish("Argon","light_off",PRIVATE);Stringnum=String(detect);//Gives thingspeak a value to graphParticle.publish("Sensor_value",num,PRIVATE);// Publishes value for thingspeak to graph, can be view in Particle Console}if(detect<700&&Time.hour()>=8&&Time.hour()<=20&&circuit_status==true){//If all contraints are met the aquarium light turns on and publishes event telling the other argon the light is on.digitalWrite(light,HIGH);Particle.publish("Argon","light_on",PRIVATE);Stringnum=String(detect);//Same as above, gives thingspeak values to graph in real timeParticle.publish("Sensor_value",num,PRIVATE);}if(Time.hour()==0&&circuit_status==true){//Code lines 33 - 76 are all the same. They have different time values because the time function does not want to recognize < or > atfer the first statement.digitalWrite(light,LOW);//Turns the light off at pre-determined hours, publishes event to tell the other argon the light is off. Only happens id the circuit is in the on state.Particle.publish("Argon","light_off",PRIVATE);}if(Time.hour()==1&&circuit_status==true){digitalWrite(light,LOW);Particle.publish("Argon","light_off",PRIVATE);}if(Time.hour()==2&&circuit_status==true){digitalWrite(light,LOW);Particle.publish("Argon","light_off",PRIVATE);}if(Time.hour()==3&&circuit_status==true){digitalWrite(light,LOW);Particle.publish("Argon","light_off",PRIVATE);}if(Time.hour()==4&&circuit_status==true){digitalWrite(light,LOW);Particle.publish("Argon","light_off",PRIVATE);}if(Time.hour()==5&&circuit_status==true){digitalWrite(light,LOW);Particle.publish("Argon","light_off",PRIVATE);}if(Time.hour()==6&&circuit_status==true){digitalWrite(light,LOW);Particle.publish("Argon","light_off",PRIVATE);}if(Time.hour()==7&&circuit_status==true){digitalWrite(light,LOW);Particle.publish("Argon","light_off",PRIVATE);}if(Time.hour()==21&&circuit_status==true){digitalWrite(light,LOW);Particle.publish("Argon","light_off",PRIVATE);}if(Time.hour()==22&&circuit_status==true){digitalWrite(light,LOW);Particle.publish("Argon","light_off",PRIVATE);}if(Time.hour()==23&&circuit_status==true){digitalWrite(light,LOW);Particle.publish("Argon","light_off",PRIVATE);}if(circuit_status==false){//If circuit hasn't been turned on, event is published to tell the other argon the circuit is not on.digitalWrite(light,LOW);Particle.publish("circuit_status","off",PRIVATE);delay(3000);}if(circuit_status==true){//Publishes event to tell the other argon that the circuit is on, this is shown by D7 light on the other argonParticle.publish("circuit_status","on",PRIVATE);delay(3000);}}voidcircuit_stat(constchar*event,constchar*data){//Subscribed event, listens for the button to publish and then trunes the circuit on from there.if(strcmp(data,"circuit_on")==0){circuit_status=true;digitalWrite(status,HIGH);}}
Circuit Control Argon Code
Processing
Code that turns the entire circuit on, and displays the current status of the circuit.
intlight_red=A0;intlight_yellow=A1;intstatus=D7;intpushB=A4;intbState=0;intsec_interval=2;intprev_second=0;voidsetup(){pinMode(light_red,OUTPUT);// Pin DeclarationspinMode(light_yellow,OUTPUT);pinMode(status,OUTPUT);pinMode(pushB,INPUT);Particle.subscribe("Argon",status_update,MY_DEVICES);// Subscribed to the other argon's published eventParticle.subscribe("circuit_status",Return,MY_DEVICES);// Subscribed to the other argon's published event}voidloop(){// loop, setup for the push buttonbutton();}voidbutton(){if(digitalRead(pushB)==0){// Senses when button was pushedbState=1;// button state when pressedParticle.publish("circuit","circuit_on",PRIVATE);// Publishes event for othr argon to read/use}}voidstatus_update(constchar*event,constchar*data){// Function that runs when the other argon publishes "light_on" event, sets output of red led to highif(strcmp(data,"light_on")==0){digitalWrite(light_yellow,LOW);// When event is published light changes color depending on whether the circuit is on or notdigitalWrite(light_red,HIGH);// Turns on red light when circuit is running and the light is on}elseif(strcmp(data,"light_off")==0){// Function that runs when "light_off" event is publisheddigitalWrite(light_yellow,HIGH);// Turns yellow light on to signify circuit is running but light is offdigitalWrite(light_red,LOW);}}voidReturn(constchar*event,constchar*data){// Function that runs when "off" and "on" events are publishedif(strcmp(data,"off")==0){digitalWrite(status,HIGH);// If circuit is not running the D7 light will be on}if(strcmp(data,"on")==0){digitalWrite(status,LOW);// If circuit is running then the D7 light will be turned off}}
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