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OW-SearchDemo finding devices that are not connected. — Parallax Forums

OW-SearchDemo finding devices that are not connected.

jyoungjyoung Posts: 16
edited 2006-12-25 19:45 in Propeller 1
I run OW-SearchDemo.spin with no i2c devices connected and the output says "Devices found: 10"
then gives address of ten different locations. When I connect a ds1822 device the output does not change. Does this ring any bells with anyone?

Comments

  • jyoungjyoung Posts: 16
    edited 2006-12-25 19:25
    Forgot to mention, I am using the PRC board. I am using this to automate my home brewery so I need about 10 temp sensors, so I2c it is. Thanks for any help!
  • Mike CookMike Cook Posts: 829
    edited 2006-12-25 19:36
    Have not used·the DS1822 but should be simular to the DS1820

    When I looked at this, a while back, I had to wire the DS1820 like this:
    ''
''  Wiring Diagram:
''
''   ┌──────────────┐
''   │    DS1820    │         +3.3VDC
''   │              │                                                           
''   │ GND DQ +3.3V │         │
''   └──┬───┬───┬───┘         │              Propeller I/O Pin
''      │   │   │             │                                                
''      │   │   └──┳──────────┘               │     
''      │   │       4.7K                     │
''      │   └──────┻──────────────────────────┘
''      
''   Ground
''

    To get the demo to work.

    Hope this helps,

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Mike
  • jyoungjyoung Posts: 16
    edited 2006-12-25 19:45
    Sweet! thanks for the quick responce! works perfectly!!
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