STM32F103C8T6 + HC-SR04 + OLED 开关 LED 版本2

#define TRIG_PIN PA12
#define ECHO_PIN PA15
#define CAL_FACTOR (20.0 / 18.2)

#define OLED_FAKE_GND_PIN PB6
#define OLED_FAKE_VCC_PIN PB7
#define OLED_SCL_PIN PB8
#define OLED_SDA_PIN PB9

#define SWITCH_PIN PC14
#define LED1_PIN PA1
#define LED2_PIN PA3
#define LED3_PIN PA4

HardwareSerial DebugSerial(PA10, PA9); // RX, TX
Adafruit_SSD1306 display(128, 64, &Wire, -1);

// OLED I2C: SCL=PB8, SDA=PB9
// PB6/PB7 只是给 OLED 模拟小电流供电

[env:bluepill_f103c8]
platform = ststm32
board = bluepill_f103c8
framework = arduino
upload_protocol = stlink
monitor_speed = 115200
lib_deps =
    adafruit/Adafruit SSD1306@^2.5.13
    adafruit/Adafruit GFX Library@^1.11.11

main.cpp 关键片段

// 当前下载包和 B 站视频对应：优化实录版
// Trig=PA12, Echo=PA15
// OLED: PB6=模拟GND, PB7=模拟3.3V, SCL=PB8, SDA=PB9
// Switch=PC14, LED=PA1/PA3/PA4
// Serial monitor: CP2102 TX->PA10, RX->PA9, 115200

#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

#define TRIG_PIN PA12
#define ECHO_PIN PA15
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define CAL_FACTOR (20.0 / 18.2)

#define OLED_FAKE_GND_PIN PB6
#define OLED_FAKE_VCC_PIN PB7
#define OLED_SCL_PIN PB8
#define OLED_SDA_PIN PB9

#define SWITCH_PIN PC14
#define LED1_PIN PA1
#define LED2_PIN PA3
#define LED3_PIN PA4

HardwareSerial DebugSerial(PA10, PA9); // RX, TX
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

float getDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  unsigned long duration = pulseIn(ECHO_PIN, HIGH, 30000);
  if (duration == 0) return -1;
  return (duration / 58.0) * CAL_FACTOR;
}

void setup() {
  DebugSerial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  digitalWrite(TRIG_PIN, LOW);

  pinMode(SWITCH_PIN, INPUT_PULLDOWN);
  pinMode(LED1_PIN, OUTPUT);
  pinMode(LED2_PIN, OUTPUT);
  pinMode(LED3_PIN, OUTPUT);
  digitalWrite(LED1_PIN, HIGH); // LED 正极接 3.3V，GPIO 高电平=灭
  digitalWrite(LED2_PIN, HIGH);
  digitalWrite(LED3_PIN, HIGH);

  pinMode(OLED_FAKE_GND_PIN, OUTPUT);
  digitalWrite(OLED_FAKE_GND_PIN, LOW);
  pinMode(OLED_FAKE_VCC_PIN, OUTPUT);
  digitalWrite(OLED_FAKE_VCC_PIN, HIGH);
  delay(10);

  Wire.setSCL(OLED_SCL_PIN);
  Wire.setSDA(OLED_SDA_PIN);
  Wire.begin();
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
}

void loop() {
  static bool lastSwitchOn = false;
  static int activeLed = 0;

  bool switchOn = digitalRead(SWITCH_PIN) == HIGH;
  if (switchOn && !lastSwitchOn) {
    activeLed = (activeLed + 1) % 3;
  }
  lastSwitchOn = switchOn;

  digitalWrite(LED1_PIN, activeLed == 0 ? LOW : HIGH);
  digitalWrite(LED2_PIN, activeLed == 1 ? LOW : HIGH);
  digitalWrite(LED3_PIN, activeLed == 2 ? LOW : HIGH); // PA4 只能全亮/全灭

  float cm = getDistanceCM();
  DebugSerial.println(cm);

  // 完整 OLED 显示、小猫动画和 LED 调暗逻辑请下载 ZIP 工程查看。
  delay(300);
}