Pinout

MAX7219 8×8 LED matrix module pinout

Pins

VCC (5V)
GND
DIN (SPI data in)
CS (chip select / LOAD)
CLK
Output header on the far edge (VCC GND DOUT CS CLK): DOUT daisy-chains the next module's DIN, the other four just pass through

Driver IC	MAX7219
Display	8 × 8 LEDs (64), single colour
Supply voltage	5 V (IC rated 4.0–5.5 V)
Logic input high	3.5 V min (3.3 V MCU is marginal)
Interface	SPI-style, up to 10 MHz
Brightness	16 levels, peak current set by RSET
Chaining	DOUT → next module's DIN
Current	Up to several hundred mA per module at full brightness

RGB LED (5 mm, common cathode, 4-pin)Package: 5 mm through-hole, 4 leads; Configuration: Common cathode (longest lead); Forward voltage (red): ≈ 2 V typical
WS2812B / NeoPixel addressable LED stripLED: WS2812B, 5050 package with built-in driver; Supply voltage: 5 V (chip rated 3.5–5.3 V); Data input high: ≥ 0.7 × VDD (3.5 V at 5 V supply)
16×2 character LCD (HD44780, 16-pin)Controller: HD44780 or compatible; Display: 16 characters × 2 lines, 5 × 8 dot cells; Supply voltage: 5 V (3.3 V versions exist)
7-segment display (single digit, 10-pin)Digit height: 0.56 in (14.2 mm); Configuration: Common cathode (5161AS) or common anode (5161BS); Segments: 7 + decimal point
SSD1306 OLED 128×64 (0.96″, I2C, 4-pin)Controller: SSD1306; Resolution: 128 × 64 pixels, monochrome; Diagonal: 0.96 in
TM1637 4-digit 7-segment moduleDriver IC: TM1637; Digits: 4 × 7-segment with centre colon; Supply voltage: 3.3–5 V (module)
ILI9341 TFT display (SPI, 2.4″)Controller: ILI9341; Resolution: 240 × 320 pixels; Colour depth: Up to 262K colours (18-bit); 16-bit RGB565 typical
NRF24L01 2.4GHz radio (2×4 header)Chip: Nordic nRF24L01+; Supply voltage: 1.9–3.6 V (use 3.3 V); Logic inputs: 5 V tolerant