PWM and Temperature sensor

Today was a productive day.
After a lot of testing of the PWM circuit, we had a good result.
The circuit is now working, but we only need to modify this.
We use now 4 single Op-amps (741) , in the future we go build this
with a quad op-amp IC.

This is a video of our signal:


And this evening, we are started with the LM35 Temperature sensor.
Here is also a first good result: we can read in the output of the sensor with the labjack.

This is the testcode where I send the measured signal on the input to the output but with a factor of 10 higher, so that it is easier to measure. Because the LM35 rise 10mV/°C.




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Public Class Form1
    Dim spanning As Double = 0
    Dim Checkken As Integer = 0

    Public Sub New()

        ' This call is required by the Windows Form Designer.
        InitializeComponent()

        ' Add any initialization after the InitializeComponent() call.

    End Sub


    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        Timer1.Start()
    End Sub

    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
        lj.LabJack.EAnalogIn(-1, 0, 0, 0, 2, spanning)
        lj.LabJack.EAnalogOut(-1, 0, (spanning * 10), 0)
    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
        Timer1.Stop()
    End Sub
End Class

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Video: