opethe1st

def flip(s):
    res = []
    for l in s:
        if l=='+':
            res.append('-')
        else:
            res.append('+')
    return "".join(res)

def countFlips(s,k):

opethe1st

def lastWord(word):
    if len(word)==1:
        return word
    lastletter = word[-1]
    restOfWord = lastWord(word[:-1])
    if ord(lastletter)>=ord(restOfWord[0]):
        return lastletter+restOfWord
    else:
        return restOfWord+lastletter

opethe1st

# Title 
Smart Farm
# Picture 
media: http://www.deviantsart.com/38fdru4.jpg
# Objective
A lot of people don't have the time or resources to grow their own food even though they would like to. 
The goal of this project is to help ordinary people take care of their farms. It automatically waters the plants when it detects that the soil moisture level has gone below a certain treshold.
# Duration
2 hours
# Age Group

opethe1st

// Uses a PIR sensor to detect movement, buzzes a buzzer

int ledPin = 13;                // choose the pin for the LED
int inputPin = 2;               // choose the input pin (for PIR sensor)
int pirState = LOW;             // we start, assuming no motion detected
int val = 0;                    // variable for reading the pin status
int pinSpeaker = 10;           //Set up a speaker on a PWM pin (digital 9, 10, or 11)

void setup() {
  pinMode(ledPin, OUTPUT);      // declare LED as output

opethe1st

# Title 
Arduino Powered Burglar Alarm
# Picture 
media: http://www.deviantsart.com/3099afr.jpg
# Objective
Nigeria is a very hot place. Temperature averages 30 degree Celsius and even at Night the temperature is hot. The aim of this project is to regulate temperature by turning on the fan whenever the temperature reaches a certain level and turn it off whenever the temperature drops.  This helps to conserve energy and also to improve comfort for the owner.
# Duration
40min
# Age Group
all