Adding example for pc joystick

examples/seesaw_pc_joystick.py

@@ -0,0 +1,72 @@
+# SPDX-FileCopyrightText: 2023 Limor Fried for Adafruit Industries
+#
+# SPDX-License-Identifier: MIT
+
+import time
+import board
+from micropython import const
+from adafruit_seesaw.seesaw import Seesaw
+
+BUTTON_1 = const(3)
+BUTTON_2 = const(13)
+BUTTON_3 = const(2)
+BUTTON_4 = const(14)
+
+JOY1_X = const(1)
+JOY1_Y = const(15)
+JOY2_X = const(0)
+JOY2_Y = const(16)
+
+button_mask = const(
+    (1 << BUTTON_1) | (1 << BUTTON_2) | (1 << BUTTON_3) | (1 << BUTTON_4)
+)
+
+i2c_bus = board.STEMMA_I2C()  # The built-in STEMMA QT connector on the microcontroller
+# i2c_bus = board.I2C()  # Uses board.SCL and board.SDA. Use with breadboard.
+
+seesaw = Seesaw(i2c_bus, addr=0x49)
+
+seesaw.pin_mode_bulk(button_mask, seesaw.INPUT_PULLUP)
+
+last_x = 0
+last_y = 0
+x = 0
+y = 0
+
+while True:
+    # These joysticks are really jittery so let's take 4 samples of each axis
+    for i in range(4):
+        x += seesaw.analog_read(JOY1_X)
+        y += seesaw.analog_read(JOY1_Y)
+
+    # take average reading
+    x /= 4
+    y /= 4
+
+    # PC joysticks aren't true voltage divider because we have a fixed 10K
+    # we dont know the normalized value so we're just going to give you
+    # the result in 'Kohms' for easier printing
+
+    x = 1024 / x - 1
+    y = 1024 / y - 1
+
+    if (abs(x - last_x) > 3) or (abs(y - last_y) > 3):
+        print(x, y)
+        last_x = x
+        last_y = y
+
+    buttons = seesaw.digital_read_bulk(button_mask)
+
+    if not buttons & (1 << BUTTON_1):
+        print("Button 1 pressed")
+
+    if not buttons & (1 << BUTTON_2):
+        print("Button 2 pressed")
+
+    if not buttons & (1 << BUTTON_3):
+        print("Button 3 pressed")
+
+    if not buttons & (1 << BUTTON_4):
+        print("Button 4 pressed")
+
+    time.sleep(0.01)