Help: How to control DC Motor using VB Expres 2005

[shounenbat]

im using ldr to sense the revolution of the motor per minute or per second, pls help im a beginner and still don't know how to program well.

my program is not working


dim x as integer
Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Label1.Text = Inp(889)
X = X + 1

End Sub

End Sub

[shounenbat]

to be more easier for us both, and not to be unfair for others like what you have said a while ago, lets make the code easier. lets say i have a button tool.
by clicking the button how will i compute and display the no of times i clicked it per minute?

[Andy_P]

There are a couple of ways you could work out RPM:

1. Count pulses and test the count after a set period of time, eg. 1 second.
2. Detect how much time passes between pulses.

I would suggest that option number 1 will be easier.

Take your input and increment a counter with each pulse you get.

On each timer tick, read the counter value and multiply it by 60. This will give you RPM assuming a tick frequency of 1 second, and also assuming you have one pulse per revolution of your motor. After you have calculated a result for that tick, reset your counter variable.

Really though, that's mostly just basic maths.

How you read in the input from the sensor, I have no idea, but I assume you already know that, or it forms part of the study material for you project.

As has been mentioned, I don't think anyone will write out a whole load of code for you, but that should give you a nudge in the right direction.

[shounenbat]

tanx Andy_P i'll try to work on it.

[shounenbat]

Public X As Integer
Public y As Integer

Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

Timer1.Interval = 1000

X = (X + 1)

Label1.Text = X ' this show the timer tick every sec

label2.text=inp(889) 'signal coming from my ldr




you have said that the count of my signal should be multiplied by 60, then should i declare an integer to show the rpm??