Difference between revisions of "MAX7219X4"
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* Each display has 8 of 7 segment LED displays | * Each display has 8 of 7 segment LED displays | ||
* "Blue" card | * "Blue" card | ||
+ | * Not compatible with [[MAX7219X4#.22Red.22_Modules|red modules]] | ||
** [https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1311&_nkw=max7219+8-digit+led+display+7+segment&_sacat=0&LH_TitleDesc=0&_odkw=MAX7219&_osacat=0 ebay search] | ** [https://www.ebay.com/sch/i.html?_from=R40&_trksid=p2334524.m570.l1311&_nkw=max7219+8-digit+led+display+7+segment&_sacat=0&LH_TitleDesc=0&_odkw=MAX7219&_osacat=0 ebay search] | ||
* 3.3V interface operation | * 3.3V interface operation |
Revision as of 15:37, 27 July 2022
Contents
Features
- (4) MAX7219 8 digits, 7 Segment 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
- Not compatible with red modules
- 3.3V interface operation
- 3.3V to 5V Level shifter
- Requires both 3.3V and 5V power supplies
- 8 pin connector
- 95x95mm ODAS form factor
- (4) 6-32 mounting holes
J1 Connector
- 3.3V level
- 1x8 right angle header mounted on rear of card
- GND
- GND
- DOUT
- CLK
- CS
- DIN
- 3.3V
- 5V
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 |
"Red" Modules
- Incompatible pinouts
- Flipped from blue modules