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BS2P And Relay — Parallax Forums

BS2P And Relay

ShanShan Posts: 6
edited 2007-11-28 15:01 in BASIC Stamp
I'm using BS2P chip for my robot. And currently i use LM44BB00 Relay to control QTI as i have QTI in both side of the robot. At first it was working properly. But after i installed the PCB fabricated board for BS2P, whenever i activate relay some of the motors start to shake. Please help me to solve this problem. confused.gif

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2007-11-28 15:01
    This is likely to be one of two things.
    1) When the relay is activated, it draws enough additional current to cause the power supply voltage to "sag" and that causes a reset of the Stamp. It might be local to that area of the board and may just cause a noise pulse large enough to force the reset or it might cause the power regulator to shut down briefly from overcurrent or overheating.
    2) When the relay is activated and then turned off, the reverse voltage spike (from the collapse of the magnetic field around the relay coil) could cause a reset. You normally put a reverse connected diode across any relay or motor coil to prevent this.

    If you want any more specific information, you'll have to post your schematic and program code.
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