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Re: Looking for EV3 Infra Red Sensor and Beacon Specs

Ah - interesting indeed! So we can actually use any PF handset with permanently activated button as beacon... (but perhaps there are IR beam width considerations?)
by philoo
10 Nov 2013, 12:57
 
Forum: Mindstorms Hardware
Topic: Looking for EV3 Infra Red Sensor and Beacon Specs
Replies: 16
Views: 12459

Re: efficiency of the ev3 H-bridges ?

I opened an EV3... I didn't want to take the risk of breaking something, so I didn't go too far away, but enough to see the fuses. Indeed, there are 3 of them, all rated 1.1A. So maximum available current is 1.1A (permanent, something around 2A for a short time) for 2 motor ports.
by philoo
09 Nov 2013, 17:01
 
Forum: Mindstorms Hardware
Topic: efficiency of the ev3 H-bridges ?
Replies: 17
Views: 11082

Re: efficiency of the ev3 H-bridges ?

OK, we have the same ;)
by philoo
09 Nov 2013, 16:44
 
Forum: Mindstorms Hardware
Topic: efficiency of the ev3 H-bridges ?
Replies: 17
Views: 11082

Re: efficiency of the ev3 H-bridges ?

so you mean overall 3A for all and everything? 3A is the internal current limit of driver chip. but its continuous rating is 1.5A (2A peak) per motor. But it can only provide current provided by upstream fuse, battery, etc... It looks to me like there are two separate thermal fuses one for each of ...
by philoo
09 Nov 2013, 16:24
 
Forum: Mindstorms Hardware
Topic: efficiency of the ev3 H-bridges ?
Replies: 17
Views: 11082

Re: efficiency of the ev3 H-bridges ?

Input. I mean the fuse between the battery compartment and the EV3 main board. There is no output fuses on motor ports, but the driver chip does limit current to about 3A (and it has a thermal shutdown too if needed).
by philoo
09 Nov 2013, 15:28
 
Forum: Mindstorms Hardware
Topic: efficiency of the ev3 H-bridges ?
Replies: 17
Views: 11082

Re: efficiency of the ev3 H-bridges ?

the load is always at the limit of the motor thermal fuses. I probably even will need 2-4 addional motors but there is no daisy chaining and no support of the MS RCX-MMux yet by BCC/C . Then I think EV3 input fuse will trigger... NXT one was a 1.8A fuse, hopefully on the EV3 with its 4 motors ports...
by philoo
09 Nov 2013, 13:25
 
Forum: Mindstorms Hardware
Topic: efficiency of the ev3 H-bridges ?
Replies: 17
Views: 11082

Re: efficiency of the ev3 H-bridges ?

Depends on the load! clearly the "official" method would be to use another EV3 in slave mode. Anyway I'm fairly confident that you can try without burning anything...
by philoo
09 Nov 2013, 12:57
 
Forum: Mindstorms Hardware
Topic: efficiency of the ev3 H-bridges ?
Replies: 17
Views: 11082

Re: efficiency of the ev3 H-bridges ?

As far as I know the EV3 motor driving chip is the same as the one used in PF receiver V2 (while NXT one was the same as V1). This makes this comparison somewhat releveant: http://philohome.com/pfrec/pfrec.htm. As with PF V2 the real power limitation will probably be EV3 input resettable fuse - and ...
by philoo
09 Nov 2013, 10:34
 
Forum: Mindstorms Hardware
Topic: efficiency of the ev3 H-bridges ?
Replies: 17
Views: 11082

Re: ev3 large motors: do they have a built-in fuse?

Looks a lot like a 0.75A rated Bourns MF-MSMF075 resettable fuse... (the same used in all PF battery packs)
by philoo
28 Oct 2013, 13:17
 
Forum: Mindstorms Hardware
Topic: ev3 large motors: do they have a built-in fuse?
Replies: 4
Views: 2901

Re: EV3 large and medium motors now in motors comparison page

These motor do have a short description at the beginning of page, section "the roster", but indeed they are not shown by their numbers there... I'll try to improve this.
by philoo
16 Oct 2013, 09:40
 
Forum: Mindstorms Hardware
Topic: EV3 large and medium motors now in motors comparison page
Replies: 2
Views: 2097
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