Arduino IDE library for initially written purely for the the FocalTech FT6236 touch controller. But more IC's are supported. At the moment the following IC's are supported:
- FT6236 (ChipID 0x36)
- FT6206 (ChipID 0x06)
- FT6236U (ChipID 0x64)
First, include the library in your sketch:
#include <FT6236.h>
Next, create the object to be used (I use "ts" here, but you can use whatever you like):
FT6236 ts = FT6236();
Next, in the setup() use begin to start the touch controller:
ts.begin(40)
40 sets the threshold for touch detection, aka how sensitive the touchscreen is. 40 seems to be a good number. This can be an integer from 0 to 255.
If your I2C pins are not the board's default pins or you are using custom pins for I2C you can also specify the I2C pins to be used. You start by supplying the threshold and then the I2C data pin followd by the I2C clock pin:
ts.begin(40, SDA_pin, SCL_pin)
Lastly, in the loop you can check for touches. If there is a touch detected, touched() will return true and you can go and get the X and Y coordinates using getPoint(). In the loop it will look something like this:
void loop(void)
{
if (ts.touched())
{
// Retrieve a point
TS_Point p = ts.getPoint();
// Print coordinates to the serial output
Serial.print("X Coordinate: ");
Serial.println(p.x);
Serial.print("Y Coordinate: ");
Serial.println(p.y);
}
//Debouncing. To avoid returning the same touch multiple times you can play with this delay.
delay(50);
}
At the and of a short loop a delay is needed to give the controller some time to clear it's registers and be ready for a next touch. If you have a short loop and don't add this delay, you run the risk of a touch being picked up multiple times where it was meant to be just a single touch.
The datasheet can be found all over the internet, but this is one with the register descriptions in it. Which comes in handy! http://dustinwatts.nl/docs/FT6236-FocalTechSystems.pdf
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