Update encoder examples to advise div ratio of 4.

README.md

@@ -326,11 +326,13 @@ display = Display(ssd, nxt, sel, prev, increase, decrease)
 Where an encoder replaces the `increase` and `decrease` buttons, only the final
 line needs to be changed to provide an extra arg:
 ```python
-display = Display(ssd, nxt, sel, prev, increase, decrease, 5)
+display = Display(ssd, nxt, sel, prev, increase, decrease, 4)
 ```
 The final arg specifies the sensitivity of the attached encoder, the higher the
 value the more the knob has to be turned for a desired effect. A value of 1
-provides the highest sensitivity, being the native rate of the encoder.
+provides the highest sensitivity, being the native rate of the encoder. Many
+encoders have mechanical detents: a value of 4 matches the click rate of most
+devices.
 
 The commented-out `quiet()` line provides a means of suppressing diagnostic
 messages.
@@ -816,8 +818,7 @@ To specify to the GUI that an encoder is in use an integer should be passed to
 the `Display` constructor `encoder` arg. Its value represents the division
 ratio. A value of 1 defines the native rate of the encoder; if the native rate
 is 32 pulses per revolution, a value of 4 would yield a virtual device with
-8 pulses per rev. I found the Adafruit encoder to be too sensitive. A value of 5 
-improved usability.
+8 pulses per rev. A value of 4 matches most encoders with mechanical detents. 
 
 If an encoder is used but the `encoder` arg is `False`, response to the encoder
 will be erratic.

gui/primitives/encoder.py

@@ -15,7 +15,7 @@ class Encoder:
         self._pin_y = pin_y
         self._x = pin_x()
         self._y = pin_y()
-        self._v = 0  # Hardware value always starts at 0
+        self._v = 0  # Initialise hardware value
         self._cv = v  # Current (divided) value
         if ((vmin is not None) and v < vmin) or ((vmax is not None) and v > vmax):
             raise ValueError('Incompatible args: must have vmin <= v <= vmax')

setup_examples/ili9341_pico_encoder.py

@@ -51,4 +51,4 @@ sel = Pin(16, Pin.IN, Pin.PULL_UP)  # Operate current control
 prev = Pin(18, Pin.IN, Pin.PULL_UP)  # Move to previous control
 increase = Pin(20, Pin.IN, Pin.PULL_UP)  # Increase control's value
 decrease = Pin(17, Pin.IN, Pin.PULL_UP)  # Decrease control's value
-display = Display(ssd, nxt, sel, prev, increase, decrease, 5)  # Encoder
+display = Display(ssd, nxt, sel, prev, increase, decrease, 4)  # Encoder

setup_examples/st7789_ttgo.py

@@ -101,7 +101,7 @@ from gui.core.ugui import Display
 nxt = Pin(32, Pin.IN, Pin.PULL_UP)  # Move to next control
 sel = Pin(36, Pin.IN, Pin.PULL_UP)  # Operate current control
 prev = Pin(38, Pin.IN, Pin.PULL_UP)  # Move to previous control
-encoder = 5  # Divide by 5
+encoder = 4  # Divide by 4
 if encoder:
     increase = Pin(25, Pin.IN, Pin.PULL_UP)  # Encoder x and y pins
     decrease = Pin(33, Pin.IN, Pin.PULL_UP)