diff --git a/GPIO/ReadMe.md b/GPIO/ReadMe.md
index 57c749ac..6c27c762 100644
--- a/GPIO/ReadMe.md
+++ b/GPIO/ReadMe.md
@@ -73,3 +73,19 @@ LoRa32: 4 (3.3V) -> FZ: 9 (3.3V)
 
 Switch between UART Pins 13/14 and 15/16 setting in FlipperZero<br>
 `GPIO -> USB-UART Bridge -> LEFT -> UART Pins`
+
+# Some other accessories to try with Flipper (Code needed!)
+
+## HC-SR04 Ultrasonic Distance Sensor
+
+![HC-SR04](https://user-images.githubusercontent.com/57457139/182779625-f3d43727-c9a6-4c44-8916-3150cccb0fc8.jpg)
+
+```
+HC-SR04: 1 (RX0) -> FZ: 13 or 15 (these are TX pins)
+HC-SR04: 2 (TX0) -> FZ: 14 or 16 (these are RX pins)
+HC-SR04: 3 (GND) -> FZ: 8 or 11 or 18 (GND)
+HC-SR04: 4 (5V)  -> FZ: 1 (5V)
+
+Switch between UART Pins 13/14 and 15/16 setting in:
+Flipper -> GPIO -> USB-UART Bridge -> LEFT -> UART Pins
+```