Technical summary
The module uses a 3-wire serial bus: a CS wire that selects the MAX7219 and latches the data into the chip (stores it), a CLK wire that clocks the sending of the signals, and finally a DIN wire that receives the data + 2 wires for its power supply.
It can be used to build electronic display panels, and you can make your applications livelier thanks to the LED brightness adjustment that can be implemented in software.
Wiki and External Links
- Manual: http://www.elecrow.com/wiki/index.php?title=LED_matrix_kit
- MAX7219 datasheet: http://www.elecrow.com//download/MAX7219.pdf
- Demo of the 8x8 LED matrix driven by a MAX7219 on the Raspberry Pi via python http://raspi.tv/2013/8-x-8-led-array-driven-by-max7219-on-the-raspberry-pi-via-python
- A scrolling-text display project on the Instructables website: http://www.instructables.com/id/16x8-LED-dot-matrix-with-MAX7219-module/
(Translation in preparation)
Product Description
MAX7219 is an integrated serial input/output common-cathode display driver, which connects the microprocessor 7-segment digital LED display with 8 digits, bar graph can also be connected monitor or 64 separate LED. On type B BCD encoder includes an on-chip, multi-channel scanning loop, segment word drive, but also a 8x8 static RAM for storing each data. Only one external register is used to set the segment current for each LED.
A convenient four-wire serial interface can connect all common microprocessor. Each data can be addressed in the update does not overwrite all of the display. MAX7219 also allows the user to select each of the data code or not coded.
The entire device includes a 150?A low-power shutdown mode, analog and digital brightness control, a scan-limit register allows the user to 1-8 bits of data, there is an LED light so that all the detection mode.
Requires only three IO ports can drive a dot! No flashing dot matrix display! Support cascade!
Module Parameters:
single module can drive a common cathode 8 * 8 dot matrix
module operating voltage: 5V
Module size: 5cm long x 3.2cm wide x 1.5cm high
holes with four screws, diameter 3mm, can be fixed by using our M3 studs
modules with input and output interfaces, support for cascading multiple modules
Wiring:
1 is a block left input port, an output port on the right.
2 When control of a single module, simply input port receiving CPU
When cascading multiple modules 3, output and input termination CPU, the input output termination module of the first two modules of the first one, the first two modules of terminating the input of the first three modules, and so on. ..
To 51 single example:
VCC ? 5V
GND ? GND
DIN ? P22
CS ? P21
CLK ? P20
Shipping list:
1 x MAX7219 dot matrix module 10 (finished with lattice, has tested well)
1 x DuPont line 50
