ADC까지, 신호 확인 필요(반사 신호 약함 or 뒤쪽을 찍고 있음)

boards/nrf52840dk_nrf52840.overlay

@@ -26,22 +26,27 @@
 };
 
 /* I2C0 핀 재설정: ICM42670P IMU (SCL=P1.14, SDA=P1.15) */
-&i2c0_default {
-	group1 {
+&i2c0_default
+{
+	group1
+	{
 		psels = <NRF_PSEL(TWIM_SCL, 1, 14)>,
 		        <NRF_PSEL(TWIM_SDA, 1, 15)>;
 	};
 };
 
-&i2c0_sleep {
-	group1 {
+&i2c0_sleep
+{
+	group1
+	{
 		psels = <NRF_PSEL(TWIM_SCL, 1, 14)>,
 		        <NRF_PSEL(TWIM_SDA, 1, 15)>;
 		low-power-enable;
 	};
 };
 
-&i2c0 {
+&i2c0
+{
 	status = "okay";
 	clock-frequency = <I2C_BITRATE_STANDARD>;
 };
@@ -128,5 +133,79 @@
 			gpios = <&gpio1 8 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
 			label = "Power Button";
 		};
+
+		/* 피에조 TX/RX 전원 레일 제어 (TMP235 온도센서도 이 레일 공유)
+		 * HIGH = 전원 ON, LOW = 전원 OFF */
+		PIEZO_PWR: PIEZO_PWR
+		{
+			gpios = <&gpio1 9 GPIO_ACTIVE_HIGH>;
+			label = "Piezo Power Enable";
+		};
+
+		PIEZO_PE: PIEZO_PE
+		{
+			gpios = <&gpio0 25 GPIO_ACTIVE_HIGH>;
+			label = "Piezo Pulse Enable";
+		};
+
+		PIEZO_P_OUT: PIEZO_P_OUT
+		{
+			gpios = <&gpio1 7 GPIO_ACTIVE_HIGH>;
+			label = "Piezo P Out";
+		};
+
+		PIEZO_N_OUT: PIEZO_N_OUT
+		{
+			gpios = <&gpio1 6 GPIO_ACTIVE_HIGH>;
+			label = "Piezo N Out";
+		};
+
+		PIEZO_DMP: PIEZO_DMP
+		{
+			gpios = <&gpio1 0 GPIO_ACTIVE_HIGH>;
+			label = "Piezo Dump";
+		};
+
+		MUX_EN_A: MUX_EN_A
+		{
+			gpios = <&gpio0 21 GPIO_ACTIVE_HIGH>;
+			label = "Mux Enable A";
+		};
+
+		MUX_EN_B: MUX_EN_B
+		{
+			gpios = <&gpio0 23 GPIO_ACTIVE_HIGH>;
+			label = "Mux Enable B";
+		};
+
+		MUX_SEL0: MUX_SEL0
+		{
+			gpios = <&gpio1 10 GPIO_ACTIVE_HIGH>;
+			label = "Mux Select 0";
+		};
+
+		MUX_SEL1: MUX_SEL1
+		{
+			gpios = <&gpio0 28 GPIO_ACTIVE_HIGH>;
+			label = "Mux Select 1";
+		};
+
+		ECHO_SCLK: ECHO_SCLK
+		{
+			gpios = <&gpio0 14 0>;
+			label = "Echo ADC SCLK";
+		};
+
+		ECHO_MISO: ECHO_MISO
+		{
+			gpios = <&gpio0 15 0>;
+			label = "Echo ADC MISO";
+		};
+
+		ECHO_CS: ECHO_CS
+		{
+			gpios = <&gpio0 19 GPIO_ACTIVE_LOW>;
+			label = "Echo ADC CS";
+		};
 	};
 };