Asked
— Edited
i thought about my wall-e... and thought...and thought... and one of the things i thought of was an on/off switch(painful to open up, close, open, close, etc.)
I decided to put a power button/switch on the power cable, the only thing is which one! Not sure what websit to go to or what voltage to buy it from.
Fine on connecting it. just need to know voltage and where.
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...
Thanks again,
Elfège
MOSFET thats about 37 amps is $.88 plus a resistor and diode for inductive load
Many thanks again.
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
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
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
ALSO a diode is only needed for inductive load,i made a tutorial on this on and why
Inductive load is when driving a relay or a motor straight from the switch
SECOND the IN4001 is very low rated voltage and wont handle high voltage kickbacks from a motor or relay coil
I don't expect a clear and helpful reply but I may be proved wrong.
Just like ELFEGE said when he lost 1 volt ,i done tests long time ago when learning about mosfets witch i know alot about NOW and with my tests with a fully turn on transistor you lose more then 2 volts.
MOSFET is like a switch when its fully turn on.one main reason h-bridge designs now made uses them.
ZERO voltage drop
DONT need a tutorial to post info that is needed in other posts.
And i did make a tutorial ,but problems it had was hard for others to read or find useful info,because of the mess others made . but will make another one with photos of my design and a lot of info from web plus my info i have from mtesting mosfets that i dont many has done.
THIS info about the mosfet was for ELFEGE so it wasnt against you
ITS the same if i post a idea in other person post and you have a better idea you can post it too.
WE are all here it help others build robots ,LETS KEEP IT LIKE THAT please
One thing to keep in mind about Darlingtons is that, by their very nature,
there is a substantial voltage drop between the collector and emitter. This
causes more heat dissipation in the device, and results in less power to the
load. In some cases it is acceptable, in others it isn't. It may result in
the need for a heat sink, making it more expensive overall than a different
transistor which wouldn't need a heat sink under the same conditions.
I GUESS IT BETTER to find proof then try to explain it
here is the link that has a lot more info too
darlington transistor vs mosfets
I think on every post i made or reply too,its much easy to find info on the web for proof then try to explain it.
MAIN ITEMS I said about why a mosfet is better choice,low voltage drop across the collector to emitter,less power loss and no need for a heatsink
formula is in the link and they mention TIP120 AS A EXAMPLE
Thats what i see great about this forum others helping others to make a good robot design
Elfege