这其实就是一个检测蜂鸣器，在不同的频率下发出声音的检测代码，十分简单
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代码如下：
#include <Arduino.h> #include <NeoPixelBus.h> #define LEDC_CHANNEL_0 0 #define LEDC_TIMER_13_BIT 13 #define Buzzer 25 #define brightness 128 int BuzzerTestFreq = 0; int LEDC_BASE_FREQ = 200; void ledcAnalogWrite(uint8_t channel, uint32_t value) { // calculate duty, 8191 from 2 ^ 13 - 1 (2 ^ LEDC_TIMER_13_BIT - 1) //value_MAX = 255 uint32_t duty = (8191 / 255) * value; // write duty to LEDC ledcWrite(channel, duty); } void setup() { Serial.begin(115200); } void loop() { ledcSetup(LEDC_CHANNEL_0, LEDC_BASE_FREQ, LEDC_TIMER_13_BIT); ledcAttachPin(Buzzer, LEDC_CHANNEL_0); LEDC_BASE_FREQ = LEDC_BASE_FREQ + 10; // set the brightness on LEDC channel 0 ledcAnalogWrite(LEDC_CHANNEL_0, brightness); delay(1000); Serial.print("Freq:"); Serial.print(LEDC_BASE_FREQ); Serial.print(" Duty:"); Serial.print(brightness/2.55); Serial.println(); ledcAnalogWrite(LEDC_CHANNEL_0, 0); }
使用串口工具，连接bit板，串口配置为115200-8-N-1，就会接收到bit板返回的数据，主要包括当前频率（Freq）还有当前占空比（Duty）代码里面是占空比不变，频率递加，并且没有设置上限。github地址