# Address 읽기 및 쓰기
**Step 0. ETH-01D I2C command 전송**
* Device에서 Command ((i2c Address+Write bit),0xA0, 0x00, 0x00)를 ETH-01D로 전송
.PNG?alt=media)
**Step 1. Sensor Address 요청 Command**
* Device에서 Command ((i2c Address+Write bit),0x1C, 0x00, 0x00)를 ETH-01D로 전송
.PNG?alt=media)
**Step 2. Address 응답**
* ETH-01D에서 상태 값과 Address 값 응답(3byte)
.PNG?alt=media)
**Step 3. Sensor Address 쓰기 Command**
* Device에서 Command ((i2c Address+Write bit),0x5C, Register Value\[15:8], 변경할 address\[7:0]) 를 ETH-01D로 전송
* 변경할 address\[7:0] : Register value \[6:0] 만 변경
.PNG?alt=media)
## 소스 코드
{% tabs %}
{% tab title="Sensor Address 읽기 및 쓰기" %}
```cpp
#include
#define slave_address 0x44
#define change_slave_address 0x44 // <- This address is subject to change
#define Sensor_power_port 6 // Arduino uno, Arduino mkr 1010, esp32
// #define Sensor_power_port 16 // esp8266
#define Power_enable digitalWrite(Sensor_power_port, HIGH)
#define Power_disable digitalWrite(Sensor_power_port, LOW)
#define Address_read_command Wire.write(0x1C)
#define Address_write_command Wire.write(0x5C)
void setup()
{
Wire.begin();// arduino uno, Arduino mkr 1010
//Wire.begin(7,8,5000); //esp32
//Wire.begin(4,5,5000); //esp8266
Serial.begin(9600);
pinMode(Sensor_power_port, OUTPUT);
}
void loop()
{
int Status;
int RegisterValueHigh;
int RegisterValueLow;
//===Module Power Reset===
Power_disable; //전원 끔
delay(1);
Power_enable;
delay(2); //10msec 이내에 신호 전송되어야함
// Step 1. ETH-01D I2C command 전송
//프로그래밍 모드로 들어가기 위한 명령, 명령어 처리 시까지 120usec 시간이 소요됨.
Wire.beginTransmission(slave_address);
Wire.write(0xA0);
Wire.write(0x00);
Wire.write(0x00);
Wire.endTransmission();
delayMicroseconds(120);
//Step 2. 온습도 Address 요청 Command
Wire.beginTransmission(slave_address);
Address_read_command;
Wire.write(0x00);
Wire.write(0x00);
Wire.endTransmission();
delay(1);
//Step 3. 온습도 Address 응답 ex)81 00 44
Wire.requestFrom(slave_address, 3);
if (Wire.available()) {
Status = Wire.read();
RegisterValueHigh = Wire.read();
RegisterValueLow = Wire.read();
Serial.print(Status, HEX); // 0x81 = status succes
Serial.print(" ");
Serial.print(RegisterValueHigh,HEX);
Serial.print(" ");
Serial.print(RegisterValueLow, HEX);
Serial.println(" <= Read the register contents");
}
// adress 읽은 뒤 [6:0] 비트만 변경
#if 0 // adress 읽은 뒤 #if 0 -> #if 1
//Step 4. 온습도 Address 쓰기 Command, 데이터 기록시간은 14msec가 필요함
Wire.beginTransmission(slave_address);
Address_write_command;
Wire.write(0x00);
Wire.write(change_slave_address); // 변경 할 address write
Wire.endTransmission();
delay(14);
Serial.print(change_slave_address, HEX);
Serial.println(" <= Write the register contents");
#endif
//Step 5. 프로그래밍 모드에서 일반 모드로 전환
Wire.beginTransmission(slave_address);
Wire.write(0x80);
Wire.write(0x00);
Wire.write(0x00);
Wire.endTransmission();
delay(1000);
}
```
{% endtab %}
{% endtabs %}
Address 읽기 및 쓰기 시리얼 모니터
