Design with TM1638 display & switch in Cirkit DesignerThe TM1638 is an integrated circuit designed by TM that combines an LED display driver and a key scan interface. This versatile component is widely used in microcontroller projects to control 7-segment displays and read input from a matrix of switches. Its ability to handle both display and input functions makes it an excellent choice for creating user interfaces in embedded systems.
This circuit connects a TM1637 display module to a Raspberry Pi 3B. The Raspberry Pi controls the display via GPIO pins 20 and 21 for data and clock signals, respectively. The TM1637 is powered by the Raspberry Pi's 5V supply, and both devices share a common ground.
Open Project in Cirkit Designer
This circuit features an Arduino UNO microcontroller connected to a TM1637 display module and an SG90 servo motor. The Arduino provides power to both the display and the servo motor, and it controls the display via digital pins D4 (DIO) and D3 (CLK), and the servo motor via pin D2 (PWM). The primary function of this circuit is likely to display information on the TM1637 module and to control the position or motion of the servo motor based on some programmed logic within the Arduino.
Open Project in Cirkit Designer
This circuit features an RTL8720DN microcontroller interfaced with a China ST7735S 160x128 TFT LCD display and four pushbuttons. The microcontroller reads the states of the pushbuttons and displays their statuses on the TFT LCD, providing a visual feedback system for button presses.
Open Project in Cirkit Designer
This circuit features a Nano 33 BLE microcontroller interfaced with a TM1637 4-digit 7-segment display for information output, powered by a 3.7V battery managed by a TP4056 charging module. The microcontroller communicates with the display to present data, while the TP4056 ensures the battery is charged safely and provides power to the system.
Open Project in Cirkit Designer| Parameter | Value |
|---|---|
| Operating Voltage | 5V |
| Operating Current | 80mA (typical) |
| Display Type | 8-digit 7-segment LED |
| Key Scan | 8x3 matrix |
| Communication | Serial (3-wire interface) |
| Package Type | SOP-28 |
| Pin No. | Pin Name | Description |
|---|---|---|
| 1 | VDD | Power Supply (5V) |
| 2 | GND | Ground |
| 3 | DIO | Data Input/Output |
| 4 | CLK | Clock Input |
| 5 | STB | Strobe (Chip Select) |
| 6-13 | SEG1-SEG8 | Segment Outputs for 7-segment displays |
| 14-21 | GRID1-GRID8 | Grid Outputs for 7-segment displays |
| 22-28 | K1-K8 | Key Scan Inputs |
#include <TM1638.h>
// Define the pins for the TM1638 module
#define DIO_PIN 2
#define CLK_PIN 3
#define STB_PIN 4
// Create an instance of the TM1638 class
TM1638 module(DIO_PIN, CLK_PIN, STB_PIN);
void setup() {
// Initialize the module
module.setupDisplay(true, 7); // Turn on display, set brightness to max (7)
}
void loop() {
// Display a number on the 7-segment display
module.setDisplayToDecNumber(12345678, 0x00, true);
// Read the key inputs
uint8_t keys = module.getButtons();
// Check if any key is pressed
if (keys != 0) {
// Display the key value on the first digit
module.setDisplayDigit(keys, 0, false);
}
delay(100); // Small delay to debounce keys
}
The TM1638 display and switch module is a powerful and versatile component for creating interactive displays and user interfaces in microcontroller projects. By following the guidelines and best practices outlined in this documentation, users can effectively integrate the TM1638 into their projects and troubleshoot common issues with ease.