I saw that thank you! I had modified this post but it's still there...

TOO bad i am not in your area,i dont drink beer it bad for you ,but still can buy me a drink of soda

I don't drink beer either, as a matter of fact. But I have my own soda maker! You're most welcome! You can find me on FB if you want.

BTW it seems that a transistor fixed the power issue I had with EZB shuting down while Rovio was docking. I'll let you know if it happens again, but it seems pretty stable now. I made some research online and finally found some articles about induction. That was the magic word to know to find out what was causing this problem.

I ordered a power relay on amazon, even thought I still think of making my own switch using an OSFET, as you suggested me. I want to have my own circuit, of course, but the relay will be much easier. I found wifi enabled relays too, but it's damn expensive and, most of all, I don't know which one to chose! I found this here : http://www.controlanything.com/Relay/Relay/Wi-Fi_Relay_Controllers

I saved the link so I can come to this soon enough, but it will definitely drain too much power. I read somewhere that I could add more power to the EZB... I'll need to look into that... but it will add weight... the usual issues, I guess. I posted a video of my robot playing with my cats, it's there : http://www.youtube.com/watch?v=0rdwijq4Ldc

Thanks again, Elfège

RELAYS are not great for many reasons,one they use a lot of current to drive them,very slow switching,big in size and cost alot more then mosfets,

MOSFET thats about 37 amps is $.88 plus a resistor and diode for inductive load

Pk, I'll see how it goes then. I didn't know it would use much current. I'll go to radishak today and buy a mosfet. I guess I'll need a diode too. I tried to put a diode yesterday but it didn't give the expected result. But It was a diode randomly striped out from another device... Would you let me know what diode and mosfet I need ? Actually, just the diode because you already told me about the mosfet somewhere above.

Many thanks again.

The diode and mosfet are detailed in the TIP120/122 tutorial

1n4001Diode IRL3103PBF Mosfet

Although others can be used depending on the application.

Page 2 post 5 shows the other diode position for across the load rather than across the mosfet/transistor

IRLU024N IS A BETTER CHOICE for the mosfet its rated at 17 amps and at mouser like i said is $.88 SO ITS CHEAPER

MAIN reason is better is smaller package and then the price

ALSO EBAY HAS IT FOR 3 FOR $2.49 and free shipping

IRLU024NPBF MOSFET 17A $2.49

One i found about checking and testing mosfets that,that dont need a very high current mosfet ,like in robots that draw not high current 17 amps is still high for robot ,but size is very small PLUS BIGGEST is cost compare to a mosfet at a higher current like IRL3103 AT $2.14 EACH

IRLU024N will take of any current or load needed on any robot design ,and dont need to have different current rating types

SECOND if you buy many like me its 25 at $.66 each

LAST time i bought IRL3103 WAS 25 at $1.67 each WITCH was needed for my H-BRIDGE design that needed 16 of them