B4J Question [Solved] Newbie: Detect a switch on RPi GPIO

Discussion in 'B4J Questions' started by mark35at, Aug 2, 2016.

  1. mark35at

    mark35at Well-Known Member Licensed User

    I have just got my sunfounder RPi kit and am slowly working through the examples. I am new to this so please excuse the dumb question.

    I have a LED connected to GPIO Pin0 and a switch to pin1. If the switch is pressed the LED should turn on. I am trying all the examples with B4J as I have a project lined up. I am probably making a very simple mistake.

    My code is:

    'Non-UI application (console / server application)
    #Region  Project Attributes
    #MergeLibraries: True
    #End Region

    Sub Process_Globals
    Private controller As GpioController
    Private pin0 As GpioPinDigitalOutput
    Private pin1 As GpioPinDigitalInput  
    End Sub

    Sub AppStart (Args() As String)
    End Sub

    Sub SwitchValue_StateChange(State As Boolean)
    Log("Switch: " & State)
        pin0.State = 
    End Sub

    Sub pin0_StateChange(State As Boolean)
    Log("Pin0 StateChange event: " & pin0.State)
    End Sub
    Neither sub executes. Would someone please explain what I have done wrong. Many thanks.

    Ps. RPi Model 3
  2. Erel

    Erel Administrator Staff Member Licensed User

    (There is no StateChange event for outputs)

    Are you able to see the logs?

    Add pin1.SetPinPullResistance("PULL_UP")
  3. mark35at

    mark35at Well-Known Member Licensed User

    Great Erel, :D:D.

    The sub pin0_StateChange was a left over from the first example - deleted. Added your line and set the initialize to false. Now it works. Many thanks. Learning is fun!
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