[Waterproof DS18B20 Sensor Kit Tutorial_1] DIY: Auto AC for Your Pet Fish

The sweat came out in a fine dew on my forehead when I left a room with AC and get outdoor yesterday. It just came up to my mind that my pet fish may need their own auto AC since I would go for a trip some day. So I DIY an AC through Waterproof DS18B20 Digital Temperature Sensor from DFrobot. It suits every rectangular fishbowl and costs little power.

Required Hardware:

DFRduino UNO R3

USB Cable A-B for Arduino Uno/Mega

Waterproof DS18B20 Sensor Kit

Brushless DC Fan For Nozzle

2x2A DC Motor Shield for Arduino

Wall Adapter Power Supply 12VDC

some PMMA, and some wire

Open the next URL and pick the correct version for your machine. https://www.arduino.cc/en/Main/Software

#include

int DS18S20_Pin = 2; //DS18S20 Signal pin on digital 2

int E1 = 5;

int M1 = 4;

int E2 = 6;

int M2 = 7;

//Temperature chip i/o

OneWire ds(DS18S20_Pin); // on digital pin 2

void setup(void) {

Serial.begin(9600);

pinMode(4, OUTPUT);

pinMode(7, OUTPUT);

}

void loop(void) {

int value =0;

float temperature= getTemp();

Serial.println(temperature);

delay(100);

if(temperature > 25.00)

{

digitalWrite(M1,HIGH);

digitalWrite(M2, HIGH);

analogWrite(E1, 255); //PWM

analogWrite(E2, 255); //PWM

delay(30);

}

else{

digitalWrite(M1,LOW);

digitalWrite(M2, LOW);

analogWrite(E1, 0); //PWM

analogWrite(E2, 0); //PWM

delay(30);

}

//just here to slow down the output so it is easier to read

}

float getTemp(){

//returns the temperature from one DS18S20 in DEG Celsius

byte data[12];

byte addr[8];

if ( !ds.search(addr)) {

//no more sensors on chain, reset search

ds.reset_search();

return -1000;

}

if ( OneWire::crc8( addr, 7) != addr[7]) {

Serial.println("CRC is not valid!");

return -1000;

}

if ( addr[0] != 0x10 && addr[0] != 0x28) {

Serial.print("Device is not recognized");

return -1000;

}

ds.reset();

ds.select(addr);

ds.write(0x44,1); // start conversion, with parasite power on at the end

byte present = ds.reset();

ds.select(addr);

ds.write(0xBE); // Read Scratchpad

for (int i = 0; i < 9; i++) { // we need 9 bytes

data[i] = ds.read();

}

ds.reset_search();

byte MSB = data[1];

byte LSB = data[0];

float tempRead = ((MSB << 8) | LSB); //using two's compliment

float TemperatureSum = tempRead / 16;

return TemperatureSum;

}

Leave your pet fish a ‘coolest’ summer ever.