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Unread 12-02-2004, 23:11
Dale(294engr]'s Avatar
Dale(294engr] Dale(294engr] is offline
Mentor/Sponsor since '98
FRC #0294 (Beach Cities Robotics)
Team Role: Engineer
 
Join Date: Jan 2004
Rookie Year: 1998
Location: Redondo Beach, CA
Posts: 92
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4 pin EDU PWM out power, red pin2 V in error

Our EDU controller measures 7.2V(to ~8v charged) on both pins 2 & 4.
Pin 2 (red) should be +5v
Pin 4 (unk color) should be 7.2v

Has any other teams observed this problem ?

I was looking for but find no jumper option
(so servo's could use either unreg or reg)

We could have a fault/failure inside the EDU +5v power distribution.

The middle digital IO pin does properly read +5v
(have been using that until problem is resolved)

anyone know if there are separate +5 regs inside EDU ?

Any ideas what the problem is ? or Do other EDU's have it too ?

Beacons w/7.2v to 8V charged,
using this fault would start our ~2X brighter
8v-1.34/33ohms=.2A
where orig design=5v-1.34/33 =.111A

(note IR LED's were tested, forward V=1.34v at .11A dc)