X to ground (LOW from ardiuno pins set as output) and one wire from layer Y to pull-up resistor (setting corresponding arduino pin as INPUT_PULLUP). So we connect both wires of one layer/membrane, e.g. An analog-to digital converter provides output data.įirst we need to detect if there is a touch. Alternating rapidly between pairs of edges provides frequent position updates. Disconnecting those two edges, and applying voltage to the other two, formerly unconnected, provides the other coordinate. The voltage of the top layer provides one coordinate. Locating the contact point is done by applying a voltage to opposite edges, leaving the other two edges temporarily unconnected. Edges of the resistive layer have conductive contacts. A finger or stylus deforms the glass to contact the underlying layer. The underside of the top layer has a transparent conductive coating the surface of the layer beneath it has a transparent resistive coating. The top layer is thin glass spaced close to a neighboring inner layer. Wikipedia: Touch-screen devices using resistive technology, a two-dimensional membrane potentiometer provides x and y coordinates. So you can't write to LCD display and read the touch screen in the same time. It connects through 4 wires, which share arduino pins 8, 9, A2, A3 with ILI. The touch screen is attached on the surface of the display. Then send in sequence for every single pixel in the area a value of the color to display. To draw a rectangle (or just one pixel) on the screen you have to tell to ILI the area (start_column, end_column, start_row, end_row, commands 0x2Ah and 0x2Bh) you want to draw.
09h - Read Display Status) set RD from HIGH to LOW, so ILI9341 outputs data until RD returns HIGH. To read a byte from ILI after sending a read command (e.g. ILI9341 interpretes input byte as command (if RS=0) or as data/parameter (RS=1). CS pin has to be LOW during the communication, WR rising from LOW to HIGH tells to ILI to read byte on data pins. You have first to send a command to ILI and then write or read data/parameters. It drives the display and has nothing to do with touchscreen (Although the shield connects some pins of ILI9341 together with pins of the touchscreen). ILI9341 is integrated inside the display. ILI's RESET goes to pin to Arduino analog pin A4.CS (chip select) to A3. The shield connects ILI9341's data pins 0-7 to Arduino digital pins 2-8 (allowing parallel communication, not SPI).
NTOUCH RADIO PINOUT PLUS
Colorful, 18-bit 262,000 different shades4-wire resistive touchscreen8 bit digital interface, plus 4 control lines
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