diff --git a/README.md b/README.md
index 5c2762d..0daf772 100644
--- a/README.md
+++ b/README.md
@@ -88,8 +88,8 @@ Connections 3xSDM120 <-> board:
 - VCC; +5V
 - GND; ground
 - DI; PB10, USART3_TX
-- DE; PB1 (shared with RE since one is active low while the other is active high)
-- RE; PB1 (shared with DE since one is active low while the other is active high)
+- DE; PB12 (shared with RE since one is active low while the other is active high)
+- RE; PB12 (shared with DE since one is active low while the other is active high)
 - RO; PB11, USART3_RX
 
 ESP8266
diff --git a/lib/sensor_sdm120.c b/lib/sensor_sdm120.c
index 76c6510..77f4951 100644
--- a/lib/sensor_sdm120.c
+++ b/lib/sensor_sdm120.c
@@ -45,7 +45,7 @@
  *  @{
  */
 #define SENSOR_SDM120_REDE_PORT B /**< GPIO port for RS-485 receiver and driver output enable signal */
-#define SENSOR_SDM120_REDE_PIN 1 /**< GPIO pin for RS-485 receiver and driver output enable signal */
+#define SENSOR_SDM120_REDE_PIN 12 /**< GPIO pin for RS-485 receiver and driver output enable signal */
 /** @} */
 
 /** @defgroup sensor_sdm120_timer timer peripheral to enforce waiting time between messages