5 replies to this topic

[gfcwfzkm]

Hi Community,

I buyed a display, with 8 * 7segments. (Display-Link Now i try to use it in VisualBasic, but the Sample, that they have, is in Arduino-C. I just tried with a other SampleCode, but it is for a 8x8 LED Matrix

My biggest problem is, that i dont have the know-how to use the Matrix-Sample for a normal Display-Code. My target is, to Write "Netduino" on the Display

Can someone help me with that? I just have a little Code:

Imports Microsoft.SPOT.Hardware

Public Class max7219
    ' Command reference
    Public max7219_reg_noop As Byte = &H0
    Public max7219_reg_digit0 As Byte = &H1
    Public max7219_reg_digit1 As Byte = &H2
    Public max7219_reg_digit2 As Byte = &H3
    Public max7219_reg_digit3 As Byte = &H4
    Public max7219_reg_digit4 As Byte = &H5
    Public max7219_reg_digit5 As Byte = &H6
    Public max7219_reg_digit6 As Byte = &H7
    Public max7219_reg_digit7 As Byte = &H8
    Public max7219_reg_decodeMode As Byte = &H9
    Public max7219_reg_intensity As Byte = &HA
    Public max7219_reg_scanLimit As Byte = &HB
    Public max7219_reg_shutdown As Byte = &HC
    Public max7219_reg_displayTest As Byte = &HF

    ' Pin ports for spi
    Private loadPin As OutputPort
    Private dataPin As OutputPort
    Private clkPin As OutputPort

    ' Constructor, pass pin definitions
    Public Sub New(ByVal in_dataPin As OutputPort, ByVal in_clockPin As OutputPort, ByVal in_loadPin As OutputPort)
        ' Assign local port pins to ports passed from constructor
        dataPin = in_dataPin
        clkPin = in_clockPin
        loadPin = in_loadPin
    End Sub

    ' Transmits 1 byte over SPI, bitbang method
    Public Sub putByte(ByVal data As Byte)
        Dim i As Byte = 8
        Dim mask As Integer

        While i > 0
            mask = (1 << i - 1)
            clkPin.Write(False)
            If (CInt(data) And mask) = 0 Then
                dataPin.Write(False)
            Else
                dataPin.Write(True)
            End If
            clkPin.Write(True)
            i -= 1
        End While
    End Sub

    ' Sends 1 Command / Data pair to a single driver chip
    Public Sub maxSingle(ByVal reg As Byte, ByVal col As Byte)
        ' LOAD low
        loadPin.Write(False)

        ' Transmit Register
        putByte(reg)
        ' Transmit Column
        putByte(col)

        ' LOAD high latches data sent
        loadPin.Write(True)
    End Sub
End Class

Connection MAX7219 - Netduino (Plus)
LOAD - D10
DataIN - D11
CLK - D13
mfg

gfcwfzkm =)

Datasheet MAX7219 LED Display
 MAX7219 mit 8 7seg. Anzeigen.pdf   49.82KB   4 downloads

[supra]

I was going to do this weekend. But i have NGo and shield base. Reasoning is y I was upgraded yesterday. That took 3 mnths.

I don't know what board do u gave N, N+ or NGO.

Right now i'm doing 8x32 dotmatrix (bi-color red/green) either 74hc154 or 74hc595 and no other components. U do not needed driver
JUST 74HC154 and 74HC595 and that all.

I was looking @ ur sample. But u r using 74hc595 i assumed that. And u don't know how to write code for dotmatrix.

Here is sample code for dotmatrix. But don't try this. It is written in mikroBasic. I will try to convert to Dot Net Framework.

const supra as byte[30]  = (
          $00, $46, $49, $49, $49, $31,' // S
          $00, $3F, $40, $40, $40, $3F,' // U
          $00, $7F, $09, $09, $09, $06,' // P
          $00, $7F, $09, $19, $29, $46,' // R
          $00, $7E, $11, $11, $11, $7E)' // A

If u want to c my youtube. I'm using 74hc154. Its easier to write
dotmatrix 8x32


I have 9 samples for 74hc154. Also i have small code for 74hc595( u can enter string).I do not have youtube for 74hc595.

[gfcwfzkm]

looks nice

I have / use a Netduino Plus.

Your sample looks cool (LED-Matrix) but i have only 8 * 7Seg Display.
And thats a problem too, because i dont want to write allways the hex-address to turn a line on.
i Want to Turn the 7Seg_display with a string, or a integer on, like (lc.write("9", true), not lc.write(&H11, true).

öhm, understand? ^^

mfg

gfc

Link, from site, where i buyed my display
Note: Thats is only a Sample-Picture from play-zone.ch

[supra]

Do u have VS2010? I have Library written in C

I am not sure if ur 7 segment is Common Cathode or Common Anode and not sure if it is serial or parallel.

Here is tutorial for code and table written in C.
Mylink


Also I do not have max7219. But i do have 74HC595 with 4 and 6 digits

[gfcwfzkm]

looks nice.

I will try it, thanks =)

:/

C-Code and Libary's too.

Can i code a Libary myself? i Have the Schematic of the LED-Board: Schematic

[supra]

looks nice.

I will try it, thanks =)

:/

C-Code and Libary's too.

Can i code a Libary myself? i Have the Schematic of the LED-Board: Schematic

The above link is written in mikroC. U can convert to visual basic or visual C#.
U can build DLL frm vs2010

Also in main procedure event, u can leave out.

TRISIO=0b00001000;        // GP3 is input only  CMCON0 = 0x07; 
  ANSEL = 0x00;

Email me for ledcontrol.h library. written in C. If u can't, i can post in here.