esp8266-01雖然小眾，但是功能可不能少。因航模需要讓ESP8266-01生成PPM波形。

#include <ESP8266WiFi.h>
#include <Ticker.h>  // 僅用于延時函數替代#define PPM_PIN 2    // 使用 GPIO2 (需斷開串口上傳時的連接)
#define CHANNELS 4   // PPM通道數量
#define FRAME_LENGTH 22500 // 完整PPM幀長度(us) - 標準22.5ms
#define SYNC_PULSE 400    // 同步脈沖寬度(us)
#define CHANNEL_PULSE 200 // 通道脈沖寬度(us)// 通道數據 (單位: 微秒 us)
int ppmValues[CHANNELS] = {1150, 1240, 1180, 1195}; volatile unsigned int currentChannel = 0;
volatile unsigned long nextEdge = 0;
bool outputState = false;// 硬件定時器中斷 (每1us計數)
void IRAM_ATTR onTimer() {static unsigned long counter = 0;counter++;if (counter >= nextEdge) {if (!outputState) {// 開始新脈沖digitalWrite(PPM_PIN, HIGH);outputState = true;// 設置脈沖結束時間nextEdge = counter + (currentChannel == 0 ? SYNC_PULSE : CHANNEL_PULSE);} else {// 結束當前脈沖digitalWrite(PPM_PIN, LOW);outputState = false;// 移動到下一通道currentChannel = (currentChannel + 1) % (CHANNELS + 1);// 設置下一脈沖開始時間if (currentChannel == 0) {nextEdge = counter + FRAME_LENGTH - SYNC_PULSE;} else {nextEdge = counter + ppmValues[currentChannel - 1] - CHANNEL_PULSE;}}}
}void setup() {pinMode(PPM_PIN, OUTPUT);digitalWrite(PPM_PIN, LOW);// 配置硬件定時器 (Timer1)noInterrupts();timer1_isr_init();timer1_attachInterrupt(onTimer);timer1_enable(TIM_DIV1, TIM_EDGE, TIM_LOOP); // 預分頻1 (80MHz -> 80MHz)timer1_write(80); // 80 ticks = 1us @ 80MHz (80,000,000 / 1,000,000 = 80)interrupts();
}void loop() {// 這里可以動態更新通道數據// 例如: ppmValues[0] = analogRead(A0) / 4 + 1000;ppmValues[0] = ppmValues[0]+1;ppmValues[1] = ppmValues[1]+2;ppmValues[2] = ppmValues[2]+3;ppmValues[3] = ppmValues[3]+4;if(ppmValues[0] >=2000) ppmValues[0] =1000;if(ppmValues[1] >=2000) ppmValues[1] =1000;if(ppmValues[2] >=2000) ppmValues[2] =1000;if(ppmValues[3] >=2000) ppmValues[3] =1000;delay(50);
}

觀察波形：