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power problem — Parallax Forums

power problem

SovrSovr Posts: 12
edited 2011-03-04 16:37 in Propeller 1
hello, with my robot that I have been working on for some time, I have ran into a simple problem. But just to make sure that my problem is what I think it is, I have posted this problem. The problem is when I turn on my robot it works :smile: , but then when it detects something the robot rurns but the propeller chip reboots when this task is done :frown: . But here are some details of how the power works on my robot:

1. there are two battery sources 7.9VDC 2000mAh, one battery for motor control (not connected to propeller directly), and the other battery source is for the propeller, with three ping sensors.

2. when the sensor senses an object the propeller (through a transistor and resistor) tells the motor circuit to turn, and when this happens a relay switches the direction (this is when 99% of the time when the propeller circuit reboots).

3. another thing is when it reboots it takes like 5 seconds to just reboot the propeller.

my solution is to get a higher voltage battery with some more mAh, but I would like to hear what other people would think of this problem, thank you for posting!

Comments

  • LeonLeon Posts: 7,620
    edited 2011-03-04 06:12
    The Propeller is getting a transient from the motor or relay. The grounds on the two supplies should only connect at one point, and you need additional filtering and transient suppression.
  • SovrSovr Posts: 12
    edited 2011-03-04 16:07
    thanks for the tip, I will try it out :smile:
  • RaymanRayman Posts: 14,880
    edited 2011-03-04 16:37
    Just 'cause it's on my mind... Do you have a USB connection to the Prop? Are you using fullduplexserial in your code?
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