Grove - Thumb Joystick

Thumb Joystick är en Grove-kompatibel modul som mycket liknar den "analoga" joysticken på PS2-kontroller. Joysticken har också en tryckknapp som kan användas för speciella applikationer. När modulen är i arbetsläge, kommer den att mata ut två analoga värden, som representerar två riktningar.

Kompatibilitet

• Arduino
• Raspberry Pi

Port

• Analog

Exempelkod

Arduino

void setup()
{
    Serial.begin(9600);
}

void loop()
{
    int sensorValue1 = analogRead(A0);
    int sensorValue2 = analogRead(A1);

    Serial.print("The X and Y coordinate is:");
    Serial.print(sensorValue1, DEC);
    Serial.print(",");
    Serial.println(sensorValue2, DEC);
    Serial.println(" ");
    delay(200);
}

Raspberry Pi

import time
import grovepi

# Connect the Grove Thumb Joystick to analog port A0

# GrovePi Port A0 uses Arduino pins 0 and 1
# GrovePi Port A1 uses Arduino pins 1 and 2
# Don't plug anything into port A1 that uses pin 1
# Most Grove sensors only use 3 of their 4 pins, which is why the GrovePi shares Arduino pins between adjacent ports
# If the sensor has a pin definition SIG,NC,VCC,GND, the second (white) pin is not connected to anything

# If you wish to connect two joysticks, use ports A0 and A2 (skip A1)

# Uses two pins - one for the X axis and one for the Y axis
# This configuration means you are using port A0
xPin = 0
yPin = 1
grovepi.pinMode(xPin,"INPUT")
grovepi.pinMode(yPin,"INPUT")

# The Grove Thumb Joystick is an analog device that outputs analog signal ranging from 0 to 1023
# The X and Y axes are two ~10k potentiometers and a momentary push button which shorts the x axis

# My joystick produces slightly different results to the specifications found on the url above
# I've listed both here:

# Specifications
#     Min  Typ  Max  Click
#  X  206  516  798  1023
#  Y  203  507  797

# My Joystick
#     Min  Typ  Max  Click
#  X  253  513  766  1020-1023
#  Y  250  505  769
while True:
    try:
        # Get X/Y coordinates
        x = grovepi.analogRead(xPin)
        y = grovepi.analogRead(yPin)

        # Calculate X/Y resistance
        Rx = (float)(1023 - x) * 10 / x
        Ry = (float)(1023 - y) * 10 / y

        # Was a click detected on the X axis?
        click = 1 if x >= 1020 else 0

        print "x =", x, " y =", y, " Rx =", Rx, " Ry =", Ry, " click =", click
        time.sleep(.5)

    except IOError:
        print "Error"

Mer information

http://wiki.seeedstudio.com/Grove-Thumb_Joystick/