DIY Follow Me Robot
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How to use evive's Joystick (Navigation Key)
About This Tutorial
This tutorial discusses how to work with evive's 5-way navigation key and how to read its state and display on the TFT screen with the help of an Arduino IDE sketch.
Tutorial Info
Programming Platform:
Difficulty:
Estimated Time (hrs):
2
Introduction
evive has an inbuilt 5-way navigation key, which is used to navigate through evive menu based system. The navigational key has 4 directions:
- Left
- Right
- Up
- Down.
This information is provided by the analog pin A11.
The 5th direction is centre-press. The centre switch is connected to the digital pin 19 in active HIGH mode. This means that if the switch is pressed, then pin 19 is HIGH; otherwise the pin is LOW.
The table below shows the values for their corresponding directions:
| DIRECTION | ANALOG VALUE RANGE |
| Up | 205-215 |
| Right | 405-415 |
| Down | 605-615 |
| Left | 835-845 |
Example
In this example we will read the state of the 5-way navigation key and display it on the TFT Screen.
Below is the Arduino sketch:
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