Shop OBEX P1 Docs P2 Docs Learn Events
PIR sensor unstable — Parallax Forums

PIR sensor unstable

cpsiacpsia Posts: 1
edited 2011-03-20 16:43 in Accessories
When connected to input pin of PIC16f628 and PULLED UP by 10K to +5, sensor output returns high after about 1/2 sec after it had gone low (no motion detected). It keeps on going up and down with no detection. When pullup is removed, it operates correctly. Why can't it handle a 10K pullup to +5?

Comments

  • PublisonPublison Posts: 12,366
    edited 2011-03-20 16:43
    The should not require a pull up to operate. What is the supply voltage of the PIR and PIC?
    cpsia wrote: »
    When connected to input pin of PIC16f628 and PULLED UP by 10K to +5, sensor output returns high after about 1/2 sec after it had gone low (no motion detected). It keeps on going up and down with no detection. When pullup is removed, it operates correctly. Why can't it handle a 10K pullup to +5?
Sign In or Register to comment.