RRADIUS TUTOR
Robotics Lab / Interactive electronics

Arduino Seven-Segment Display Simulator

Explore an eight-digit TM1638 LED display, inspect the Arduino wiring, and run editable Arduino code examples. Yellow parameters control the live simulation.

● Beginner friendly

01   SVG circuit & display

Live output

Eight-digit seven-segment LED display

TM1638 · 8 DIGITS · RED LED
Stopped · display idle --------

Arduino UNO → 3-wire control bus → TM1638

ARDUINO UNO ATmega328P Controller board TM1638 8 × 7-SEG LED driver module D7 D8D9 5VGND STBCLK DIOVCC GND 3-wire serial bus STB · CLK · DIO Power: UNO 5V → VCC, UNO GND → GND

02   Arduino codes

Select a sketch. Edit the yellow-highlighted parameters below; the Arduino sketch and simulated display update together.

 
 Yellow = editable parameter values 
 
 

 

 
 

 
Understand the circuit

 
03   How does the TM1638 display work?

 
The TM1638 controls eight seven-segment digits, LEDs and key scanning through a three-signal interface. The Arduino sends character patterns to the driver instead of wiring every segment separately.

 

 1 · Connect the bus
 UNO D7 → STB, D8 → CLK, D9 → DIO. Connect 5V and GND to the module.

 

 2 · Encode characters
 Each character is converted into seven segment bits (a–g). Some alphabetic characters cannot be represented accurately.

 

 3 · Update the display
 Press Play to simulate the sketch. Static text stays fixed; scroll, counter and clock modes update over time.

 

 Hardware note:
 This browser page simulates the display; it does not execute C++ or communicate with a physical Arduino. The copied sketch uses the 
 TM1638plus 
 Arduino library (install it through Arduino IDE Library Manager). Many TM1638 boards use a 5V supply; confirm your particular module's pin labels before connecting it. Clock mode measures elapsed time since startup, not real-world time.