7 位数码管
目录
- Arduino API
- Arduino UNO R3
- STM32F103C8T6 Bule Pill
- ESP32-DevKitC
- MicroPython API
- ESP32-DevKitC
- STM32Cube（待补充）
Arduino API
Arduino UNO R3
/*
7-Segment Display Digit Control
This code controls a 7-segment display connected to an Arduino.
It loops through the digits 0 to 9 and displays each digit for 1 second using individual pins for each segment.
Circuit:
- A common cathode 7-segment display is connected to pins 2-8 of the Arduino.
- Each segment (a-g) is controlled by a specific pin.
- 220Ω resistors are placed in series with each segment to limit the current.
Diagram:
Arduino 7-Segment Display
-------- -----------------
| | | a |
| 2 |------| o---/\\/\\/----| (220Ω resistor to segment a)
| 3 |------| o---/\\/\\/----| (220Ω resistor to segment b)
| 4 |------| o---/\\/\\/----| (220Ω resistor to segment c)
| 5 |------| o---/\\/\\/----| (220Ω resistor to segment d)
| 6 |------| o---/\\/\\/----| (220Ω resistor to segment e)
| 7 |------| o---/\\/\\/----| (220Ω resistor to segment f)
| 8 |------| o---/\\/\\/----| (220Ω resistor to segment g)
| | | |
| GND |------| GND (Common Cathode) |
| | --------------------
| |
created 2024
by Liang
*/
// Define the pin mappings for each segment of the 7-segment display
const int segmentA = 2;
const int segmentB = 3;
const int segmentC = 4;
const int segmentD = 5;
const int segmentE = 6;
const int segmentF = 7;
const int segmentG = 8;
void setup() {
// Initialize all segment pins as output so they can control the display
pinMode(segmentA, OUTPUT); // Set pin for segment A as output
pinMode(segmentB, OUTPUT); // Set pin for segment B as output
pinMode(segmentC, OUTPUT); // Set pin for segment C as output
pinMode(segmentD, OUTPUT); // Set pin for segment D as output
pinMode(segmentE, OUTPUT); // Set pin for segment E as output
pinMode(segmentF, OUTPUT); // Set pin for segment F as output
pinMode(segmentG, OUTPUT); // Set pin for segment G as output
}
// Function to turn off all segments (clearing the display before showing a new digit)
void clearDisplay() {
digitalWrite(segmentA, LOW); // Turn off segment A
digitalWrite(segmentB, LOW); // Turn off segment B
digitalWrite(segmentC, LOW); // Turn off segment C
digitalWrite(segmentD, LOW); // Turn off segment D
digitalWrite(segmentE, LOW); // Turn off segment E
digitalWrite(segmentF, LOW); // Turn off segment F
digitalWrite(segmentG, LOW); // Turn off segment G
}
// Function to display a specific digit on the 7-segment display
void displayDigit(int digit) {
clearDisplay(); // Clear the display to avoid leftover segments from previous digit
// Determine which segments to light up for the specified digit
switch (digit) {
case 0:
// Display '0' by lighting up segments a, b, c, d, e, f
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, LOW); // Segment g off
break;
case 1:
// Display '1' by lighting up segments b, c
digitalWrite(segmentA, LOW);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, LOW);
digitalWrite(segmentE, LOW);
digitalWrite(segmentF, LOW);
digitalWrite(segmentG, LOW);
break;
case 2:
// Display '2' by lighting up segments a, b, d, e, g
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, LOW);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentF, LOW);
digitalWrite(segmentG, HIGH);
break;
case 3:
// Display '3' by lighting up segments a, b, c, d, g
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, LOW);
digitalWrite(segmentF, LOW);
digitalWrite(segmentG, HIGH);
break;
case 4:
// Display '4' by lighting up segments b, c, f, g
digitalWrite(segmentA, LOW);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, LOW);
digitalWrite(segmentE, LOW);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 5:
// Display '5' by lighting up segments a, c, d, f, g
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, LOW);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, LOW);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 6:
// Display '6' by lighting up segments a, c, d, e, f, g
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, LOW);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 7:
// Display '7' by lighting up segments a, b, c
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, LOW);
digitalWrite(segmentE, LOW);
digitalWrite(segmentF, LOW);
digitalWrite(segmentG, LOW);
break;
case 8:
// Display '8' by lighting up all segments a, b, c, d, e, f, g
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 9:
// Display '9' by lighting up segments a, b, c, d, f, g
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, LOW);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
}
}
void loop() {
// Loop through digits 0 to 9 and display each for 1 second
for (int i = 0; i <= 9; i++) {
displayDigit(i); // Display the current digit
delay(1000); // Wait for 1 second before moving to the next digit
}
}
STM32F103C8T6 Bule Pill
Only adapt pin, other same.
/*
STM32F103C8T6 (Blue Pill) 7-Segment Display Digit Control
This code controls a 7-segment display connected to an STM32.
It loops through the digits 0 to 9 and displays each digit for 1 second using individual pins for each segment.
Circuit:
- A common cathode 7-segment display is connected to PA0-PA6 of the STM32.
- Each segment (a-g) is controlled by a specific pin.
- 220Ω resistors are placed in series with each segment to limit the current.
Diagram:
STM32 7-Segment Display
-------- -----------------
| | | a |
| PA0 |-----| o---/\\/\\/----| (220Ω resistor to segment a)
| PA1 |-----| o---/\\/\\/----| (220Ω resistor to segment b)
| PA2 |-----| o---/\\/\\/----| (220Ω resistor to segment c)
| PA3 |-----| o---/\\/\\/----| (220Ω resistor to segment d)
| PA4 |-----| o---/\\/\\/----| (220Ω resistor to segment e)
| PA5 |-----| o---/\\/\\/----| (220Ω resistor to segment f)
| PA6 |-----| o---/\\/\\/----| (220Ω resistor to segment g)
| GND |-----| GND (Common Cathode) |
| | --------------------
The LED segments are connected to PA0-PA6, and the common cathode is connected to GND.
created 2024
by Liang
*/
// Define the pin mappings for each segment of the 7-segment display
const int segmentA = PA0;
const int segmentB = PA1;
const int segmentC = PA2;
const int segmentD = PA3;
const int segmentE = PA4;
const int segmentF = PA5;
const int segmentG = PA6;
void setup() {
// Initialize all segment pins as output to control the display
pinMode(segmentA, OUTPUT);
pinMode(segmentB, OUTPUT);
pinMode(segmentC, OUTPUT);
pinMode(segmentD, OUTPUT);
pinMode(segmentE, OUTPUT);
pinMode(segmentF, OUTPUT);
pinMode(segmentG, OUTPUT);
}
// Function to turn off all segments (clearing the display before showing a new digit)
void clearDisplay() {
digitalWrite(segmentA, LOW);
digitalWrite(segmentB, LOW);
digitalWrite(segmentC, LOW);
digitalWrite(segmentD, LOW);
digitalWrite(segmentE, LOW);
digitalWrite(segmentF, LOW);
digitalWrite(segmentG, LOW);
}
// Function to display a specific digit on the 7-segment display
void displayDigit(int digit) {
clearDisplay(); // Clear the display to avoid leftover segments from previous digit
// Determine which segments to light up for the specified digit
switch (digit) {
case 0:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentF, HIGH);
break;
case 1:
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
break;
case 2:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 3:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 4:
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 5:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 6:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 7:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
break;
case 8:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 9:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
}
}
void loop() {
// Loop through digits 0 to 9 and display each for 1 second
for (int i = 0; i <= 9; i++) {
displayDigit(i);
delay(1000); // Wait for 1 second before moving to the next digit
}
}
ESP32-DevKit.
Only adapt pin, other same,
/*
ESP32 7-Segment Display Digit Control
This code controls a 7-segment display connected to an ESP32.
It loops through the digits 0 to 9 and displays each digit for 1 second using individual pins for each segment.
Circuit:
- A common cathode 7-segment display is connected to GPIO 12-18 of the ESP32.
- Each segment (a-g) is controlled by a specific pin.
- 220Ω resistors are placed in series with each segment to limit the current.
Diagram:
ESP32 7-Segment Display
-------- -----------------
| | | a |
| GPIO12|-----| o---/\\/\\/----| (220Ω resistor to segment a)
| GPIO13|-----| o---/\\/\\/----| (220Ω resistor to segment b)
| GPIO14|-----| o---/\\/\\/----| (220Ω resistor to segment c)
| GPIO15|-----| o---/\\/\\/----| (220Ω resistor to segment d)
| GPIO16|-----| o---/\\/\\/----| (220Ω resistor to segment e)
| GPIO17|-----| o---/\\/\\/----| (220Ω resistor to segment f)
| GPIO18|-----| o---/\\/\\/----| (220Ω resistor to segment g)
| GND |-----| GND (Common Cathode) |
| | --------------------
created 2024
by Liang
*/
// Define the pin mappings for each segment of the 7-segment display
const int segmentA = 12;
const int segmentB = 13;
const int segmentC = 14;
const int segmentD = 15;
const int segmentE = 16;
const int segmentF = 17;
const int segmentG = 18;
void setup() {
// Initialize all segment pins as output to control the display
pinMode(segmentA, OUTPUT);
pinMode(segmentB, OUTPUT);
pinMode(segmentC, OUTPUT);
pinMode(segmentD, OUTPUT);
pinMode(segmentE, OUTPUT);
pinMode(segmentF, OUTPUT);
pinMode(segmentG, OUTPUT);
}
// Function to turn off all segments (clearing the display before showing a new digit)
void clearDisplay() {
digitalWrite(segmentA, LOW);
digitalWrite(segmentB, LOW);
digitalWrite(segmentC, LOW);
digitalWrite(segmentD, LOW);
digitalWrite(segmentE, LOW);
digitalWrite(segmentF, LOW);
digitalWrite(segmentG, LOW);
}
// Function to display a specific digit on the 7-segment display
void displayDigit(int digit) {
clearDisplay(); // Clear the display to avoid leftover segments from previous digit
// Determine which segments to light up for the specified digit
switch (digit) {
case 0:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentF, HIGH);
break;
case 1:
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
break;
case 2:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 3:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 4:
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 5:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 6:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 7:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
break;
case 8:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentE, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
case 9:
digitalWrite(segmentA, HIGH);
digitalWrite(segmentB, HIGH);
digitalWrite(segmentC, HIGH);
digitalWrite(segmentD, HIGH);
digitalWrite(segmentF, HIGH);
digitalWrite(segmentG, HIGH);
break;
}
}
void loop() {
// Loop through digits 0 to 9 and display each for 1 second
for (int i = 0; i <= 9; i++) {
displayDigit(i);
delay(1000); // Wait for 1 second before moving to the next digit
}
}
MicroPython API
ESP32-DevKitC
"""
ESP32 控制 7 位数码管
此代码演示了如何使用 MicroPython 将 ESP32 连接到 7 位数码管，并显示数字 0 到 9。
电路连接：
- 共阴极数码管
- a: GPIO 12
- b: GPIO 13
- c: GPIO 14
- d: GPIO 15
- e: GPIO 16
- f: GPIO 17
- g: GPIO 18
- GND: 公共阴极连接到 GND
电路图：
ESP32 7-Segment Display
-------- -----------------
| | | a |
| GPIO12|-----| o---/\\/\\/----| (220Ω resistor to segment a)
| GPIO13|-----| o---/\\/\\/----| (220Ω resistor to segment b)
| GPIO14|-----| o---/\\/\\/----| (220Ω resistor to segment c)
| GPIO15|-----| o---/\\/\\/----| (220Ω resistor to segment d)
| GPIO16|-----| o---/\\/\\/----| (220Ω resistor to segment e)
| GPIO17|-----| o---/\\/\\/----| (220Ω resistor to segment f)
| GPIO18|-----| o---/\\/\\/----| (220Ω resistor to segment g)
| GND |-----| GND (Common Cathode) |
| | --------------------
创建于 2024
作者：Liang
"""
import machine
import time
# 定义数码管的段引脚
segments = [
machine.Pin(5, machine.Pin.OUT), # a
machine.Pin(18, machine.Pin.OUT), # b
machine.Pin(19, machine.Pin.OUT), # c
machine.Pin(21, machine.Pin.OUT), # d
machine.Pin(22, machine.Pin.OUT), # e
machine.Pin(23, machine.Pin.OUT), # f
machine.Pin(25, machine.Pin.OUT), # g
machine.Pin(26, machine.Pin.OUT) # dp
]
# 定义数码管显示数字 0 到 9 的段码
digit_patterns = {
0: (1, 1, 1, 1, 1, 1, 0, 0), # 0
1: (0, 1, 1, 0, 0, 0, 0, 0), # 1
2: (1, 1, 0, 1, 1, 0, 1, 0), # 2
3: (1, 1, 1, 1, 0, 0, 1, 0), # 3
4: (0, 1, 1, 0, 0, 1, 1, 0), # 4
5: (1, 0, 1, 1, 0, 1, 1, 0), # 5
6: (1, 0, 1, 1, 1, 1, 1, 0), # 6
7: (1, 1, 1, 0, 0, 0, 0, 0), # 7
8: (1, 1, 1, 1, 1, 1, 1, 0), # 8
9: (1, 1, 1, 1, 0, 1, 1, 0) # 9
}
def display_digit(digit):
"""
显示指定的数字。
参数:
digit (int): 要显示的数字（0-9）。
"""
if 0 <= digit <= 9:
pattern = digit_patterns[digit]
for i in range(len(segments)):
segments[i].value(pattern[i])
else:
print("无效的数字")
def main():
"""
主函数，循环显示 0 到 9。
"""
while True:
for digit in range(10):
display_digit(digit)
time.sleep(1)
if __name__ == "__main__":
main()