18F2550 USB on VB Express 2008 - Electronic Circuits Projects Diagrams Free

serkanc · 18th May 2008, 08:32 AM

Hi. I tried to control step motor over usb. I write program on VB Express 2008, for microchip on PBP 2.46.. I have a problem with sending data. If I send a byte which has value over 127, pic takes it always as 63 ( Ascii code of question mark ). I'm using CDC interface, endpoint 3. Is there any solution

**Nigel Goodwin** · 18th May 2008, 10:31 AM

Send your data as ASCII, not as binary.

gramo · 18th May 2008, 12:16 PM

Could you attach the vb source code?

serkanc · 18th May 2008, 12:36 PM

For Each sp As String In My.Computer.Ports.SerialPortNames
ComboBox1.Items.Add(sp)
Next
SerialPort1.Encoding = System.Text.Encoding.GetEncoding(28591)

SerialPort1.PortName = ComboBox1.SelectedItem
SerialPort1.Open()

SerialPort1.Write("M" & ChrW(Duty)

Thanks. It works. i have added this line to VB:
SerialPort1.Encoding = System.Text.Encoding.Default

serkanc · 18th May 2008, 02:04 PM

I have also one more problem to solve..
I tried to run a fan with pwm with ULN2003. Need I connect the PIC Ground to the ULN2003 or Fan Supply Ground is enough?

How can I read Fan Rpm on the third cable of Fan ? Is there any example.

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18th May 2008, 08:32 AM	#1
serkanc	18F2550 USB on VB Express 2008 Hi. I tried to control step motor over usb. I write program on VB Express 2008, for microchip on PBP 2.46.. I have a problem with sending data. If I send a byte which has value over 127, pic takes it always as 63 ( Ascii code of question mark ). I'm using CDC interface, endpoint 3. Is there any solution

18th May 2008, 10:31 AM	#2
Nigel Goodwin	Send your data as ASCII, not as binary. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

18th May 2008, 12:16 PM	#3
gramo	Could you attach the vb source code? __________________ digital-diy.com - Hobby microcontroller projects and tutorials. Assembly, PICBasic and C examples.

18th May 2008, 12:36 PM	#4
serkanc	For Each sp As String In My.Computer.Ports.SerialPortNames ComboBox1.Items.Add(sp) Next SerialPort1.Encoding = System.Text.Encoding.GetEncoding(28591) SerialPort1.PortName = ComboBox1.SelectedItem SerialPort1.Open() SerialPort1.Write("M" & ChrW(Duty) Thanks. It works. i have added this line to VB: SerialPort1.Encoding = System.Text.Encoding.Default Last edited by serkanc; 18th May 2008 at 02:01 PM.

18th May 2008, 02:04 PM	#5
serkanc	I have also one more problem to solve.. I tried to run a fan with pwm with ULN2003. Need I connect the PIC Ground to the ULN2003 or Fan Supply Ground is enough? How can I read Fan Rpm on the third cable of Fan ? Is there any example.