ET-D03
MAX7219 8-Digit Display
Eight 7-segment digits on SPI, daisy-chainable
AED 11.00
Out of stockOverview
Eight 7-segment digits on SPI, daisy-chainable
The ET-D03 is built around the Analog Devices (Maxim) MAX7219 — 8 digits, BCD decode, 16-step brightness, scan limit, shutdown. It connects over SPI (DIN (CS, CLK) with DOUT for daisy-chaining boards) and is powered from 5V, up to ~330mA all segments on.
Designed in Dubai by ElectroTrical — the full schematic, BOM and design notes are published below.
Good for
- Frequency and voltage meters
- Long counters and clocks
- Chained multi-board read-outs
Key features
What makes it different
Driver
Analog Devices (Maxim) MAX7219: 8 digits, BCD decode, 16-step brightness, scan limit, shutdown
Display
2 × 0.36" 4-digit red, common cathode — 8 digits with decimal points
Interface
SPI (DIN, CS, CLK) with DOUT for daisy-chaining boards
Supply
5V, up to ~330mA all segments on
Open documentation
Schematic, BOM and layout notes published for every board.
Breadboard friendly
Standard 2.54 mm pitch and M2.5 mounting holes.
Specifications
Technical specifications
| Driver | Analog Devices (Maxim) MAX7219: 8 digits, BCD decode, 16-step brightness, scan limit, shutdown |
|---|---|
| Display | 2 × 0.36" 4-digit red, common cathode — 8 digits with decimal points |
| Interface | SPI (DIN, CS, CLK) with DOUT for daisy-chaining boards |
| Supply | 5V, up to ~330mA all segments on |
| Size | 76.2 × 25.4 mm |
|---|---|
| Mounting | 4 × M2.5 holes, 2.54 mm from each corner |
| Connectors | 5-pin 2.54 mm header |
| Main IC | MAX7219CWG+T (LCSC C9964) |
| Revision | Rev A |
| Libraries | LedControl, MD_MAX72XX (Arduino), max7219 (MicroPython) |
|---|
Performance
Chaining
Pinout
Pin map and connections
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VCC | Power | 5V |
| 2 | GND | Ground | Ground |
| 3 | DIN | SPI | SPI MOSI |
| 4 | CS | SPI | LOAD, latch on rising edge |
| 5 | CLK | Signal | SPI SCK ≤10MHz |
Mechanical
Dimensions and what's in the box
In the box
- 1 × ET-D03 MAX7219 8-Digit Display (assembled)
- 1 × 5-pin 2.54 mm male header, unsoldered
- 2 × 0.36" 4-digit 7-segment, common cathode, red (3461AS type)
Getting started
- Wire the header: VCC, GND, DIN, CS, CLK
- Libraries: LedControl, MD_MAX72XX (Arduino), max7219 (MicroPython)
Compare
Which segment display?
| MAX7219 8-Digit Display (this board)This board | ET-D01 HT16K33 4-Digit 7-Segment Display | ET-D04 TM1637 4-Digit Display | ET-D02 HT16K33 LED Matrix Driver | |
|---|---|---|---|---|
| What it does | Eight 7-segment digits on SPI, daisy-chainable | 0.56" red 4-digit display on I²C, Qwiic | Large 0.56" 4-digit display on two GPIO pins | Drive 128 LEDs and scan 39 keys over I²C |
| Interface | SPI (DIN, CS, CLK) with DOUT for daisy-chaining… | I²C 0x70; Qwiic / STEMMA QT | CLK + DIO on any two GPIOs | I²C 0x70; Qwiic / STEMMA QT |
| Best for | Frequency and voltage meters | Clocks and timers | Simple clocks | Custom LED matrices and bar graphs |
| Price | 11 AED | 39 AED | 9 AED | 19 AED |
Downloads
Documents and design files
Need a custom version of this board?
Different connector, size or sensor? We design and build custom variants.