一个简单的人体感应门铃系统,使用M5StickC、人体红外传感器（AS312）开发，通过BLE和手机连接，当检测到人体时，手机APP进行闪屏提示。
M5StickC 是一款基于esp32,可用来进行IoT开发的硬件，非常小巧。可使用Arduino和UIFlow进行程序开发。
1.Arduino部分代码（C++）APK Download
/**
*
* init ble
*
* */
void initBLE(){
BLEDevice::init(DEVICE_NAME);
BLEServer *pServer = BLEDevice::createServer();
BLEService *pService = pServer->createService(SERVICE_UUID);
pCharacteristic = pService->createCharacteristic(
CHARACTERISTIC_UUID,
BLECharacteristic::PROPERTY_NOTIFY
);
//set default value
pCharacteristic->setValue("0");
//start service
pService->start();
BLEAdvertising *pAdvertising = pServer->getAdvertising();
pAdvertising->start();
}
void setup() {
M5.begin();
M5.Lcd.setRotation(3);
M5.Lcd.fillScreen(BLACK);
M5.Lcd.println("PIR TEST");
pinMode(36,INPUT_PULLUP);
initBLE();
}
void closeLED(){
pinMode(10, OUTPUT);
digitalWrite(10, HIGH);
}
void openLED(){
pinMode(10, OUTPUT);
digitalWrite(10, LOW);
}
void loop() {
M5.Lcd.setCursor(60, 20, 4);
int signal = digitalRead(36);
M5.Lcd.println(signal);
if(signal ==1){
itoa(signal, str, 10);
pCharacteristic->setValue(str);
pCharacteristic->notify();
}
delay(TIME_INTERVAL);
}
/**
* 连接设备
*/
private fun connectDevice(device: BluetoothDevice) {
device.connectGatt(this, true, object : BluetoothGattCallback() {
override fun onConnectionStateChange(gatt: BluetoothGatt?, status: Int, newState: Int) {
super.onConnectionStateChange(gatt, status, newState)
runOnUiThread {
when (newState) {
BluetoothProfile.STATE_CONNECTED -> {
showToast(R.string.connected)
gatt?.discoverServices()?.let { started ->
if (started) {
showToast(R.string.discover_services)
}
}
}
BluetoothProfile.STATE_DISCONNECTED -> showToast(R.string.disconnected)
BluetoothProfile.STATE_CONNECTING -> showToast(R.string.connecting)
}
}
}
override fun onServicesDiscovered(gatt: BluetoothGatt?, status: Int) {
super.onServicesDiscovered(gatt, status)
gatt?.services?.let { services ->
services.forEach { service ->
if (service.uuid.toString() == PIR_SERVICE_UUID) {
checkCharacteristic(gatt, service)
}
}
}
}
override fun onCharacteristicChanged(gatt: BluetoothGatt?, characteristic: BluetoothGattCharacteristic?) {
super.onCharacteristicChanged(gatt, characteristic)
val value = characteristic?.value?.toString(Charsets.UTF_8)
value?.let {
if (it == BLINK_VALUE) {
runOnUiThread {
blinkScreen()
}
}
}
}
})
}
/**
* 接收通知
*/
private fun checkCharacteristic(gatt: BluetoothGatt, service: BluetoothGattService?) {
service?.characteristics?.forEach { characteristic ->
if (characteristic.properties and BluetoothGattCharacteristic.PROPERTY_NOTIFY > 0 && characteristic.uuid.toString() == PIR_CHARACTERISTIC_UUID) {
gatt.setCharacteristicNotification(characteristic, true)
showToast(R.string.subscribe_success)
}
}
}
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