Open Source LED Dot Matrix Screen

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Outline Project: Microduino LED dot matrix screen Objective: To be acquainted with the use of the Microduino Dot Matrix. Difficulty: Low Time-consuming: 1 hour Maker: peng Bill of Material Bill of Module Function Number Function Microduino-Core 1 Core board Microduino-USBTTL 1 Program download Microduino-Dot Matrix 1 Display Microduino-Cube-S1 1 Extension Other Material Unit Number Function USB cable 1 Power supply, and download LED dot matrix screen shell suite 1 Shell Double-sided adhesive 2 To stick the shell Principle of the Experiment Features of the module Microduino-Module Dot Matrix: The module is 8 x 8 dot matrix, and the size is 60mm*60mm; The color display quality of each point is 24 bits, and the color display effect of the entity is 32k. Support IIC communication protocol, and the IIC address can be set（1~64）. Program Download Please keep to download and update the Microduino official latest IDE. You can download a program from the link below: Dot-Matrix-base.ino Programming Overlay Microduino-Core and Microduino-USBTTL together. Connect Microduino-USBTTL with USB cable and prepare to upload the program. Note: Please upload programs before stacking all modules together. Open Arduino IDE for Microduino environment.（The reference to set up: AVR Core: Getting started） Click [Tool], confirm board card（Microduino-Core） and processor（Atmega328P@16M,5V） selected correctly, and select the corresponding port number(COMX). Click [File]->[Open], browse to the project program address and click "Dot-Matrix-Base.ino" to open the program. After all these items are right, click "→" button to download the program to the development board. Installation Step1: Insert structure A3 vertically into structure A1. Use structure B2 to connect structure A1 and structure A2. Step2: Insert structure B1 into structure B2 too, and then use structure B3 and structure B4 to jam structure B2. Step4: To change the IIC address of the dot matrix module, you can refer to [The method of setting the IIC address of the dot matrix module] tutorial. Reserve the cable near to the key interface of the dot matrix module, in order to connect the IIC interface of Microduino-Cube-S1. Step5: Stick the dot matrix modules to the inward of the shell with two sides adhesive tape. Stack the following modules on Microduino-Cube-S1. Microduino-Core Microduino-USBTTL Microduino-BT Stick Microduino-Cube-S1 on the back of the structure B1. Operating Instruction If successful, the dot matrix screen will display the following shapes and characters in turn. Bitmap display（delivery） Bit map display（BMP film） Microduino characters flow transversely. Microduino characters flow longitudinally. Solid rectangle Solid quadrilateral Outlined rectangle Outlined quadrilateral Hollow cylindrical Solid cylindrical Straight line Flowing mcookie character 0-49 counting

Code Instruction

 uint8_t Addr[MatrixPix_X][MatrixPix_Y] = { 64 }

Define the IIC address that is set for Dot Matrix module is 64 and cascade type.

 display.getDeviceAddr(a)

Get the IIC address of the device.

 display.getWidth()，display.getHeight()

Return X,Y coordinates.

 display.setLedColor(x, y, random(0, 255), random(0, 255), random(0, 255))

Set the color of each LED randomly.

 display.clearDisplay()

Clean up the screen.

 display.setColor(X,Y,Z)

Set the color of full screen. X: Red Y: Green Z: Blue

 display.writeString("string", MODE, time ,z)

string：An arbitrary string. MODE: MODE_H display characters horizontally. /MODE_V display characters vertically. time: Show time.（flow velocity）. z: X/Y coordinate.

 display.drawBMP(X,Y,W,H,logoA)  

X:Horizontal coordinates Y: Longitudinal coordinate W：The width of the image H：The height of the image logoA: Image array.

 display.drawBMP(X,Y,logoB)

X:Horizontal coordinates Y: Longitudinal coordinate logoB：Image array(Because logoB is the array of BMP file, you don’t need to obtain the image size again. To get in-depth knowledge about BMP, you can refer to the dot matrix module display the BMP color graph).

 display.drawBox(X,Y,I,W)

This function is used to drawing a solid rectangle. X: Horizontal coordinate. Y: Longitudinal coordinate. I: Length. W: Width.

 display.drawRBox(X, Y, I,W)

This function is used to drawing a solid apex angle bending rectangular. X: Horizontal coordinate. Y: Longitudinal coordinate. I: Length. W: Width.

 display.drawFrame(X,Y,I,W)

This function is used to draw a hollow rectangle. X: Horizontal coordinate. Y: Longitudinal coordinate. I: Length. W: Width.

 display.drawRFrame(X,Y,I,W,)

This function is used to draw a hollow apex angle bending rectangular. X: Horizontal coordinate. Y: Longitudinal coordinate. I: Length. W: Width.

 display.drawCircle(X,Y,D)

This function is used to draw a hollow circle. X: Horizontal coordinate. Y: Longitudinal coordinate. D: Diameter.

 display.drawDisc(X,Y,D)

This function is to draw a solid circle. X: Horizontal coordinate. Y: Longitudinal coordinate. D: Diameter.

 display.drawLine(X,Y,M,N)

This function is to draw a straight line. X: Starting point horizontal coordinate. Y: Starting point longitudinal coordinate. M: Finishing point horizontal coordinate. N: Ending point longitudinal coordinate.

FAQ

• Q:How to know the IIC address?
  • A:Refer to[method to set the IIC address of the dot matrix module] tutorial.
• Q:How to use multiple screens at the same time?
  • A: In the next page Open Source LED Dot Matrix Clock, there will be specific introduction of the cascade of multiple Microduino-Module Dot Matrix.
• Q:Why does it display incompletely after counting to 20?
  • A: Because the dot matrix resolution is only 8*8, there are not enough pixels, and the screen can't display the numbers after 20 completely.

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