Selasa Cek modul MD02 menggunakan RS405 dan ESP32
Alat dan bahan
ESP 32
RS485
MD02
Wiring modul MD02
HardwareSerial RS485( HW_SERIAL ); // Use Hardware Serial 0 or 1
ModbusRTUMaster modbus( RS485 );
void setup() {
Serial.begin(115200); // USB-CDC
while(!Serial);
Serial.flush();
// Set Tx/Rx pins for RS485-serial
if (HW_SERIAL==0) {
// Default pins for Serial0: RX=GPIO20, TX=GPIO21
RS485.setPins( 20 /*RX*/, 21 /*TX*/ );
} else {
// Default pins for Serial1: RX=GPIO18, TX=GPIO19
// Use RX=10 and TX=9 for Super-Mini ESP32C3 Board.
RS485.setPins( 10 /*RX*/, 9 /*TX*/ );
}
// Set baudrate for RS485-serial
modbus.begin( 9600 );
}
void loop() {
static uint8_t dev_addr = 1;
uint16_t regValues[2] = {0xffff,0xffff};
// device address, starting address of input registers,
// number of input registers to read
modbus.readInputRegisters( dev_addr, 0x0001, regValues, 2 );
if ( regValues[0] != 0xffff ) {
float temp = ((int16_t)regValues[0])/10.0f;
float humid = ((int16_t)regValues[1])/10.0f;
Serial.println(String("XY-MD02 Reading, Device Address: ") + dev_addr);
Serial.println(String("- Temperature : ") + temp + String(" deg.C"));
Serial.println(String("- Humidity : ") + humid + String(" %RH\n"));
} else {
Serial.println("Sensor reading errors!");
}
Serial.flush();
if ((dev_addr += 1) > 2) {
dev_addr = 1;
}
delay(2000);
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