Dot Matrix Module 4-in-1 Display Screen – MAX7219
Dot Matrix Module 4-in-1 Display Screen using the MAX7219 LED Matrix/Digit Display Driver
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Controlling a lot of LEDs is challenging, the commonly used technique is multiplexing, but when there are so many LEDs involved like 64 LEDs (say), you might need 16 pins (8×8)and 8 power transistors (or a power register/latch, that can supply over 100mA per pin) AND you have to constantly refresh the display to keep the image stable.
The MAX7219 in this Dot Matrix Module simplifies all the work for you, it controls and refreshes the screen while driving either an 8×8 matrix display or 8 x 7-segment displays (usually these also have a dot so its really an 8-segment display) – 64 LEDs total.
All you have to do is send it serial commands via the 4-pin SPI interface and it will take care of the rest. Wiring is simplified as well, you only need to set the current level for all LEDs with a single resistor instead of 8 and you can also dim the entire display digitally.
1 x MAX7219 Dot Matrix Module 4-in-1
1 x 5-pin Dupont Cable
- A single module can drive a 8×8 dot matrix common cathode
- Working voltage: 5V
- Module size: 12.8 x 3.2 x 1.3 cm (L*W*H)
- With 64 fixing screw holes, hole diameter: 3mm
- Module with input and output interfaces, support for cascading multiple modules
1. The left side of the module is the input port, and the right is the output port.
2. Control of a single module, the input port only need to receive CPU.
3. The more a module cascade and input end of the first module is connected with the CPU and input end of the input end of the output end is connected to the second module, output terminal of the second module connected with the three modules, and so on.
For example: 51 SCM
- CS →P2.1
|Dimensions||12.8 × 3.2 × 1.3 cm|