====== Serial Coinslot | Flash Arduino Using Android Phone ======
Softwares to Download:
  - Install [[ https://play.google.com/store/apps/details?id=xyz.vidieukhien.embedded.arduinohexupload | Arduino Hex Uploader App]]
  - Download {{ :4.0.0-beta.1:serialcoinslot-v4.0.0.zip |Arduino Hex}}. Unzip the content of the zip file (serialcoinslot-xxxxx.zip).

After downloading the needed softwares, connect the **Arduino** to your Android phone via **OTG**. Make sure you enable the OTG setting on your android.

Open **Arduino Hex Uploader App** and tap the Arduino device in the list. 
Tap **Ok** if prompted to **Allow Arduino Hex Upload to access USB2.0-serial**.
{{ :4.0.0-beta.1:arduino-hex-upload-step1.png?direct&150 |}}

Then **Select the Arduino firmware** you downloaded:
{{ :4.0.0-beta.1:arduino-hex-upload-step2.jpg?direct&150 |}}

Select the **arduino board** and tap the icon on the bottom-right to start flashing. Wait for the **Upload success** message.
{{ :4.0.0-beta.1:arduino-hex-upload-step3.jpg?direct&150 |}}