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This is challenge number 1 - Build an Arduino LED Binary Counter. The details are on the Overview page. You have to find the secret code and enter the result in the Code Entry page. Those who successfully complete challenge 1 are eligible to enter the random draw for spot prizes.
Challenges 2 and 3 are article writing challenges and those articles/ entries can be found under the Entries tab. Hope this clarifies.
"I controlled my laughter and simple said "No,I am very busy,so I can't write any code for you". The moment they heard this all the smiling face turned into a sad looking face and one of them farted. So I had to leave the place as soon as possible." - Mr.Prakash One Fine Saturday. 24/04/2004