MAX7219X4
Contents
Features
- (4) 7 Segment MAX7219 displays
- 32 digits
- 4 rows
- 8 digits per row
- Can display decimal, hex values
- Each display has 8 of 7 segment LED displays
- "Blue" card
- 3.3V operation
- 3.3V to 5V Level shifter
- Requires 3.3V and 5V power supplies
- 8 pin connector
- 95x95mm ODAS form factor
- (4) 6-32 mounting holes
Programming
Arduino Drivers
- MAX7219X4 Arduino GitHub repository
- Uses Arduino LedControl library
- Library only writes to (1) 8-digit display
- Pins
- Arduino UNO pin 12 is connected to the DataIn
- Arduino UNO pin 11 is connected to the CLK
- Arduino UNO pin 10 is connected to CS
- Uses Arduino LedControl library
- LEDMatrixDriver - Alt driver
- Can drive more than 8 segments (limited only by memory)
- Writing to the display is controlled by software
- Much faster because it uses hardware SPI with soft SS
- Recommended pins for Arduino Uno:
- DIN is connected to 11
- CLK is connected to 13
- CS is connected to 9
- MAX72XX - Alt driver
- One or more 7-segment displays driven by a MAX7219 or MAX7221 IC
Test
Test Modules
| SenShld | Desc | MAX J1 | Color |
|---|---|---|---|
| VCC | VCC | 1 | RED |
| GND | GND | 2 | BLK |
| D12 | DATAIN | 3 | WHT |
| D10 | CS | 4 | BRN |
| D11 | CLK | 5 | YEL |
Mechanicals
