LEARN ESP32
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挑战
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课程
BLE 蓝牙
BLE 不像经典蓝牙传音乐，它传「一小撮数据」。做一个心率计服务，手机 nRF Connect 连上就能读写特征值——手机遥控就靠这层。
- BLE 是服务端：靠 Service + Characteristic
- 用 NimBLE 库比 ArduinoBLE 更省内存
- 手机写特征值 → 板子回调里收
动手试试
BLECharacteristic *c;
void onWrite(BLECharacteristic *ch) {
bool on = ch->getValue()[0] == 1;
digitalWrite(2