diff --git a/README.org b/README.org
index f291374..448f3cc 100644
--- a/README.org
+++ b/README.org
@@ -9,3 +9,22 @@ pip install -r requirements.txt
 #+BEGIN_SRC sh
 picocom /dev/ttyUSB0 -b115200
 #+END_SRC
+
+* Small card
+** Set up distance measuring
+#+begin_src python
+from hcsr04 import HCSR04
+import time
+
+sensor = HCSR04(trigger_pin=16, echo_pin=0)
+
+while True:
+    print(sensor.distance_cm())
+    time.sleep(1)
+#+end_src
+
+** HCSR04 Pins
+Trig -- D0
+Echo -- D3
+Vcc  -- 5V
+GND  -- GND