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Update docs: add PWMLED and include value, values and source properties

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Ben Nuttall
2015-11-15 17:18:10 +00:00
parent 382d6e45fc
commit 4975e9c8fb
6 changed files with 168 additions and 47 deletions
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23
docs/index.md
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@@ -12,17 +12,36 @@ The latest release is **v0.9.0 beta 4** released on 25th October 2015.
## About
With very little code, you can quickly get going connecting your physical
components together:
Component interfaces are provided to allow a frictionless way to get started
with physical computing:
```python
from gpiozero import LED
from time import sleep
led = LED(2)
while True:
led.on()
sleep(1)
led.off()
sleep(1)
```
With very little code, you can quickly get going connecting your components
together:
```python
from gpiozero import LED, Button
from signal import pause
led = LED(2)
button = Button(3)
button.when_pressed = led.on
button.when_released = led.off
pause()
```
The library includes interfaces to many simple everyday components, as well as

12
docs/inputs.md
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@@ -44,7 +44,7 @@ Button(pin=None, pull_up=True, bounce_time=None)
| Argument | Description | Values | Default |
| -------- | ----------- | ------ | ------- |
| `pin` | The GPIO pin number the button is connected to. | Integer: `0` to `25` | *Required* |
| `pin` | The GPIO pin number the button is connected to. | Integer | *Required* |
| `pull_up` | The pull state of the pin. `True` means pull up, `False` means pull down. | Boolean | `True` |
| `bounce_time` | Specifies the length of time (in seconds) that the component will ignore changes in state after an initial change. | Integer or Float | `None` |
@@ -64,6 +64,8 @@ Button(pin=None, pull_up=True, bounce_time=None)
| `pull_up` | The pull state of the pin (`True` if pulled up; `False` if pulled down). | Boolean |
| `when_pressed` | A reference to the function to be called when the button is pressed. | `None` or Function |
| `when_released` | A reference to the function to be called when the button is released. | `None` or Function |
| `value` | The current value of the button. 0 if off; 1 if on. | Float |
| `values` | A generator continuously yielding the button's current value. | Generator |
## Motion Sensor
@@ -99,7 +101,7 @@ MotionSensor(pin=None, queue_len=1, sample_rate=10, threshold=0.5, partial=False
| Argument | Description | Values | Default |
| -------- | ----------- | ------ | ------- |
| `pin` | The GPIO pin number the sensor is connected to. | Integer: `0` to `25` | *Required* |
| `pin` | The GPIO pin number the sensor is connected to. | Integer | *Required* |
| `queue_len` | ??? | Integer | `1` |
| `sample_rate` | ??? | Integer | `10` |
| `threshold` | Proportion of sensor values required to determine motion state. | Float: `0` to `1` | `0.5` |
@@ -120,6 +122,8 @@ MotionSensor(pin=None, queue_len=1, sample_rate=10, threshold=0.5, partial=False
| `motion_detected` | The current state of the sensor (`True` if motion is detected; otherwise `False`). | Boolean |
| `when_motion` | A reference to the function to be called when motion is detected. | `None` or Function |
| `when_no_motion` | A reference to the function to be called when no motion is detected. | `None` or Function |
| `value` | The current value of the sensor. 0 if still; 1 if motion. | Float |
| `values` | A generator continuously yielding the sensor's current value. | Generator |
## Light Sensor
@@ -153,7 +157,7 @@ LightSensor(pin=None, queue_len=5, charge_time_limit=10,
| Argument | Description | Values | Default |
| -------- | ----------- | ------ | ------- |
| `pin` | The GPIO pin number the sensor is connected to. | Integer: `0` to `25` | *Required* |
| `pin` | The GPIO pin number the sensor is connected to. | Integer | *Required* |
| `queue_len` | ??? | Integer | `5` |
| `charge_time_limit` | Maximum amount of time allowed to determine darkness. | Integer | `10` |
| `threshold` | Proportion of sensor values required to determine light level. | Float: `0` to `1` | `0.1` |
@@ -174,6 +178,8 @@ LightSensor(pin=None, queue_len=5, charge_time_limit=10,
| `light_detected` | The current state of the sensor (`True` if light; otherwise `False`). | Boolean |
| `when_light` | A reference to the function to be called when light is detected. | `None` or Function |
| `when_dark` | A reference to the function to be called when darkness is detected. | `None` or Function |
| `value` | The current value of the sensor. 0 if dark; 1 if light. | Float |
| `values` | A generator continuously yielding the sensor's current value. | Generator |
## MCP3008 Analogue-to-Digital Converter

4
docs/notes.md
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@@ -244,11 +244,11 @@ values, but are configurable when necessary.
A property is an attribute relating to the state of an object. For example:
```python
my_led.is_active
my_led.is_lit
```
This will return `True` or `False` depending on whether or not the LED is
currently on.
currently lit.
Some properties allow you to change their value. For example an `RGBLED` object:

103
docs/outputs.md
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@@ -44,7 +44,7 @@ LED(pin=None, active_high=True)
| Argument | Description | Values | Default |
| -------- | ----------- | ------ | ------- |
| `pin` | The GPIO pin number the LED is connected to. | Integer: `0` to `25` | *Required* |
| `pin` | The GPIO pin number the LED is connected to. | Integer | *Required* |
| `active_high` | Whether high or low voltage turns the LED on. | Boolean | `True` |
#### Methods
@@ -64,7 +64,68 @@ LED(pin=None, active_high=True)
| Property | Description | Type |
| -------- | ----------- | ---- |
| `pin` | The GPIO pin number the LED is connected to. | Integer |
| `is_active` | The current state of the LED (`True` if on; `False` if off). | Boolean |
| `is_lit` | The current state of the LED (`True` if on; `False` if off). | Boolean |
| `value` | The current state of the LED (`True` if on; `False` if off). | Boolean |
| `values` | A generator continuously yielding the LED's current value. | Generator |
| `source` | A generator which can be used to continuously set the LED's value. | `None` or Generator |
## PWMLED
An LED (Light emitting diode) component with the ability to set brightness.
*Note this interface does not require a special LED component. Any regular LED
can be used in this way.*
### Wiring
A PWMLED is wired the same as a regular LED.
### Code
Ensure the `PWMLED` class is imported at the top of the file:
```python
from gpiozero import PWMLED
```
Create an `LED` object by passing in the pin number the LED is connected to:
```python
led = PWMLED(17)
```
#### Initialisation options
```python
PWMLED(pin=None, active_high=True)
```
| Argument | Description | Values | Default |
| -------- | ----------- | ------ | ------- |
| `pin` | The GPIO pin number the LED is connected to. | Integer | *Required* |
| `active_high` | Whether high or low voltage turns the LED on. | Boolean | `True` |
#### Methods
| Method | Description | Arguments |
| ------ | ----------- | --------- |
| `on()` | Turn the LED on. | None |
| `off()` | Turn the LED off. | None |
| `toggle()` | Toggle the LED. If it's on, turn it off; if it's off, turn it on. | None |
| `blink()` | Make the LED turn on and off repeatedly. | `on_time` - The amount of time (in seconds) for the LED to be on each iteration. **Default: `1`** |
| | | `off_time` - The amount of time (in seconds) for the LED to be off each iteration. **Default: `1`** |
| | | `n` - The number of iterations. `None` means infinite. **Default: `None`** |
| | | `background` - If `True`, start a background thread to continue blinking and return immediately. If `False`, only return when the blink is finished (warning: the default value of n will result in this method never returning). **Default: `True`** |
#### Properties
| Property | Description | Type |
| -------- | ----------- | ---- |
| `pin` | The GPIO pin number the LED is connected to. | Integer |
| `is_lit` | The current state of the LED (`True` if on; `False` if off). | Boolean |
| `value` | The current brightness of the LED `0` to `1`. | Float |
| `values` | A generator continuously yielding the LED's current value. | Generator |
| `source` | A generator which can be used to continuously set the LED's value. | `None` or Generator |
## Buzzer
@@ -100,7 +161,7 @@ Buzzer(pin=None, active_high=True)
| Argument | Description | Values | Default |
| -------- | ----------- | ------ | ------- |
| `pin` | The GPIO pin number the buzzer is connected to. | Integer: `0` to `25` | *Required* |
| `pin` | The GPIO pin number the buzzer is connected to. | Integer | *Required* |
| `active_high` | Whether high or low voltage turns the buzzer on. | Boolean | `True` |
#### Methods
@@ -121,6 +182,9 @@ Buzzer(pin=None, active_high=True)
| -------- | ----------- | ---- |
| `pin` | The GPIO pin number the buzzer is connected to. | Integer |
| `is_active` | The current state of the buzzer (`True` if on; `False` if off). | Boolean |
| `value` | The current state of the buzzer (`True` if on; `False` if off). | Boolean |
| `values` | A generator continuously yielding the buzzer's current value. | Generator |
| `source` | A generator which can be used to continuously set the buzzer's value. | `None` or Generator |
## RGB LED
@@ -162,9 +226,9 @@ RGBLED(red=None, green=None, blue=None)
| Argument | Description | Values | Default |
| -------- | ----------- | ------ | ------- |
| `red` | The GPIO pin number the red LED is connected to. | Integer: `0` to `25` | *Required* |
| `green` | The GPIO pin number the green LED is connected to. | Integer: `0` to `25` | *Required* |
| `blue` | The GPIO pin number the blue LED is connected to. | Integer: `0` to `25` | *Required* |
| `red` | The GPIO pin number the red LED is connected to. | Integer | *Required* |
| `green` | The GPIO pin number the green LED is connected to. | Integer | *Required* |
| `blue` | The GPIO pin number the blue LED is connected to. | Integer | *Required* |
#### Methods
@@ -182,10 +246,13 @@ RGBLED(red=None, green=None, blue=None)
| Property | Description | Type |
| -------- | ----------- | ---- |
| `red` | The brightness value of the red LED (`0` to `1`). | Integer or Float |
| `green` | The brightness value of the green LED (`0` to `1`). | Integer or Float |
| `blue` | The brightness value of the blue LED (`0` to `1`). | Integer or Float |
| `red` | The brightness value of the red LED (`0` to `1`). | Float |
| `green` | The brightness value of the green LED (`0` to `1`). | Float |
| `blue` | The brightness value of the blue LED (`0` to `1`). | Float |
| `color` | The brightness values of the three LEDs `(0, 0, 0)` to `(1, 1, 1)`. | Tuple |
| `value` | The brightness values of the three LEDs `(0, 0, 0)` to `(1, 1, 1)`. | Tuple |
| `values` | A generator continuously yielding the LED's current values. | Generator |
| `source` | A generator which can be used to continuously set the LED's values. | `None` or Generator |
## Motor
@@ -209,19 +276,19 @@ from gpiozero import Motor
Create a `Motor` object by passing in the pin numbers the motor is connected to:
```python
motor = Motor(forward=17, back=18)
motor = Motor(forward=17, backward=18)
```
#### Initialisation options
```python
Motor(forward=None, back=None)
Motor(forward=None, backward=None)
```
| Argument | Description | Values | Default |
| -------- | ----------- | ------ | ------- |
| `forward` | The GPIO pin number the forward gear of the motor is connected to. | Integer: `0` to `25` | *Required* |
| `back` | The GPIO pin number the reverse gear of the motor is connected to. | Integer: `0` to `25` | *Required* |
| `forward` | The GPIO pin number the forward gear of the motor is connected to. | Integer | *Required* |
| `backward` | The GPIO pin number the reverse gear of the motor is connected to. | Integer | *Required* |
#### Methods
@@ -230,3 +297,13 @@ Motor(forward=None, back=None)
| `forward()` | Drive the motor forwards. | `speed` - Speed at which to drive the motor, `0` to `1`. **Default: `1`** |
| `backward()` | Drive the motor backwards. | `speed` - Speed at which to drive the motor, `0` to `1`. **Default: `1`** |
| `stop()` | Stop the motor. | None |
| `reverse()` | Reverse direction of the motor. | None |
#### Properties
| Property | Description | Type |
| -------- | ----------- | ---- |
| `is_active` | The current state of the motor. `True` if moving, otherwise `False`. | Boolean |
| `value` | The current speed and direction of the motor. `-1.0` if full speed backward, `0.0` if still, `1.0` if full speed forward. | Float |
| `values` | A generator continuously yielding the motor's current value. | Generator |
| `source` | A generator which can be used to continuously set the motor's value. | `None` or Generator |

17
docs/recipes.md
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@@ -494,3 +494,20 @@ while True:
led.green = green_pot.value
led.blue = blue_pot.value
```
Alternatively, the following example is identical and uses the `source` property
rather than a `while` loop:
```python
from gpiozero import RGBLED, MCP3008
from signal import pause
led = RGBLED(red=2, green=3, blue=4)
red_pot = MCP3008(channel=0)
green_pot = MCP3008(channel=1)
blue_pot = MCP3008(channel=2)
led.red.source = red_pot.values
led.green.source = green_pot.values
led.blue.source = blue_pot.values
```

4
gpiozero/output_devices.py
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@@ -380,7 +380,9 @@ class Motor(SourceMixin, CompositeDevice):
"""
def __init__(self, forward=None, backward=None):
if not all([forward, backward]):
raise OutputDeviceError('forward and back pins must be provided')
raise OutputDeviceError(
'forward and backward pins must be provided'
)
super(Motor, self).__init__()
self._forward = PWMOutputDevice(forward)
self._backward = PWMOutputDevice(backward)