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[RTL8722CSM] [RTL8722DM] GPIO - Blink
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.. role:: raw-html(raw)
   :format: html

:raw-html:`<p style="color:#E67E22; font-size:24px">`
**Materials**
:raw-html:`</p>`

* AmebaD[AMB21 / AMB22] x 1 
* LED x 1
* Resistor(220ohm) x 1

:raw-html:`<p style="color:#E67E22; font-size:24px">`
**Steps**
:raw-html:`</p>`

Blink is one of the best ambd_micropython/examples to get started with MicroPython.

Let us connect pin PB_22 to the anode leg of an LED which in series with a current limiting resistor and GND to cathode of the LED as shown below,

|image1|

Then, copy the following code and press ``Ctrl + e`` in ``REPL`` to enter the paste mode (for more information about ``REPL`` and paste mode, check “Getting Started” page). If you are using ``Tera Term``, simply right click on any blank space of the terminal and paste the code into ``REPL``, then press ``Ctrl + d`` to execute the code. If everything is order, you should be able to see the LED blink for 3 times in 3 seconds.

.. code-block:: python
   
   from machine import Pin
   a = Pin("PB_22", Pin.OUT)
   a.value(1)
   time.sleep_ms(500)
   a.value(0)
   time.sleep_ms(500)
   a.on()
   time.sleep_ms(500)
   a.off()
   time.sleep_ms(500)
   a.toggle()
   time.sleep_ms(500)
   a.toggle()


.. |image1| image:: /media/ambd_micropython/examples/imageBlink.png
   :width: 724
   :height: 654
   :scale: 50 %