Arduino Nano Project Board

Here's a little project I made last night. It's a small project board to play around with some of the components I have.

Materials:

1 x Arduino Nano

1 x 5x7cm through hole PCB

1 x 40 pin female header

1 x IR Transmitter

1 x IR Receiver

1 x Green Led

1 x Red Led

1 x 10k Resistor

1 x 330 Resistor

1 x HC-06 Bluetooth 

1 x DHT11 Temperature and Humidity Sensor

1 x I2C Real Time Clock

The Circuit:

IR Transmitter connected to D3

IR Receiver connected to D5

Green LED connected to D2 through 330ohm resistor

Red LED connected to D4 through 10kohm resistor

DHT11 connected to D7

HC-06 connected to tx/rx on D0/D1

RTC connected to I2C on A4/A5

Example Sketch:

Here's a simple example sketch that reads the DHT11 and RTC and displays the results in a serial terminal. It also turns on the green LED if the temperature is above 72 and turns on the red LED if the humidity drops below 35%

This sketch uses The RTC Library and The DHT Library
These both come from Adafruit's github.

/* Arduino Nano with Tiny RTC I2C, DHT11, HC-06 Bluetooth, IR Receiver and IR Transmitter on 5x7cm PCB. */ #include <Wire.h> #include "RTClib.h" #include "DHT.h" #define DHTPIN 7 #define DHTTYPE DHT11 #define green 2 #define red 4 DHT dht(DHTPIN, DHTTYPE); RTC_DS1307 RTC; void setup () { Serial.begin(9600); Wire.begin(); RTC.begin(); dht.begin(); pinMode(green, OUTPUT); pinMode(red, OUTPUT); //If we remove the comment from the following line, we will set up the module time and date with the computer one //RTC.adjust(DateTime(__DATE__, __TIME__)); } void loop () { // Reading temperature or humidity takes about 250 milliseconds! // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor) float h = dht.readHumidity(); float t = dht.readTemperature(); DateTime now = RTC.now(); //We print the month Serial.print(now.month(), DEC); Serial.print('/'); //We print the day Serial.print(now.day(), DEC); Serial.print('/'); //We print the year Serial.print(now.year(), DEC); Serial.print(' '); //We print the hour Serial.print(now.hour(), DEC); Serial.print(':'); //We print the minutes Serial.print(now.minute(), DEC); Serial.print(':'); //We print the seconds Serial.print(now.second(), DEC); Serial.println(); Serial.print("Humidity: "); Serial.print(h); Serial.print(" %"); Serial.print("Temperature: "); Serial.print((t * 18 + 5) / 10 + 32); Serial.println(" *F"); if ((t * 18 + 5) / 10 + 32 > 72) { digitalWrite(green, HIGH); } else { digitalWrite(green, LOW); } if (h < 35) { digitalWrite(red, HIGH); } else { digitalWrite(red, LOW); } delay(1000); }

I'll post some more sketches once I figure out some interesting things to do with this.