deploy: 7e0c990

.buildinfo

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+# Sphinx build info version 1
+# This file hashes the configuration used when building these files. When it is not found, a full rebuild will be done.
+config: 125d1183e421262ae167d669c878281c
+tags: 645f666f9bcd5a90fca523b33c5a78b7

_downloads/df14896bba634131bee7f870285c5b8c/main.py

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+from nanonav import BLE 
+
+# TODO: Add code to use a feature or two from the nanonav module
+# to ensure that MicroPython installation worked properly

_downloads/e6ffb4613247059f19b76a508c48412c/nanonav.py

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+#
+#
+#
+# TODO: Strip comments and docstrings once docs/source/nanonav.py skeleton is complete
+# (it's ok to leave them in for now while we are finalizing the documentation)
+#
+
+
+from ble_advertising import advertising_payload
+import bluetooth
+from machine import Pin, PWM, ADC, freq
+import machine
+from micropython import const
+import rp2
+
+import time
+
+# Define BLE constants (these are not packaged in bluetooth for space efficiency)
+_IO_CAPABILITY_DISPLAY_ONLY = const(0)
+_FLAG_READ = const(0x0002)
+_FLAG_WRITE = const(0x0008)
+_IRQ_CENTRAL_CONNECT = const(1)
+_IRQ_CENTRAL_DISCONNECT = const(2)
+_IRQ_GATTS_WRITE = const(3)
+
+class BLE:
+    """
+    A helpful wraper around the BLE service functions needed for the Wumpus World project
+    """
+    def __init__(self, ble=bluetooth.BLE(), name="NANO RP2040"):
+        # Setup bluetooth low energy communication service
+        _SERVICE_UUID = bluetooth.UUID(0x1523) # unique service id for the communication
+        _NanoNav_CHAR_UUID = (bluetooth.UUID(0x1525), _FLAG_WRITE | _FLAG_READ) # characteristic
+        _NanoNav_SERVICE = (_SERVICE_UUID, (_NanoNav_CHAR_UUID,),) # service to provide the characteristic
+
+        self._ble = ble
+        self._ble.active(True)
+        self._ble.config(
+            bond=True,
+            mitm=True,
+            le_secure=True,
+            io=_IO_CAPABILITY_DISPLAY_ONLY
+        )
+        self._ble.irq(self._irq)
+        ((self._handle,),) = self._ble.gatts_register_services((_NanoNav_SERVICE,))
+        self._connections = set()
+        self._payload = advertising_payload(name=name, services=[_SERVICE_UUID])
+        self._advertise()
+        self.value = b'a'
+
+    def _advertise(self, interval_us=500000):
+        self._ble.gap_advertise(interval_us, adv_data=self._payload)
+
+    def _irq(self, event, data):
+        # handle bluetooth event
+        if event == _IRQ_CENTRAL_CONNECT:
+            # handle succesfull connection
+            conn_handle, addr_type, addr = data
+            self._connections.add(conn_handle)
+
+            self.on_connected()
+
+        elif event == _IRQ_CENTRAL_DISCONNECT:
+            # handle disconnect
+            conn_handle, _, _ = data
+            self._connections.remove(conn_handle)
+            self._advertise()
+
+            self.on_disconnected()
+
+        elif event == _IRQ_GATTS_WRITE:
+            conn_handle, value_handle = data
+            if conn_handle in self._connections:
+                # Value has been written to the characteristic
+                self.value = self._ble.gatts_read(value_handle)
+
+    def on_connected(self):
+        """
+        You may specify this method to be called once the BLE connection is established.
+        """
+        pass
+
+    def on_disconnected(self):
+        """
+        You may specify this method to be called once the BLE connection is lost.
+        """
+        pass
+
+    def send(self, value):
+        """
+        Send value to the bluetooth characteristic.
+
+        :param value: The value to send.
+        :type value: int, bytes, or str
+        :raise ValueError: If the value is not int, bytes, or str.
+        """
+        if not isinstance(value, bytes):
+            if isinstance(value, int):
+                value = value.to_bytes(1, "big")
+            elif isinstance(value, str):
+                value = value.encode('utf-8')
+            else:
+                raise ValueError("send value should be type int, bytes, or string")
+        self.value = value
+        self._ble.gatts_write(self._handle, value)
+
+    def read(self):
+        """
+        Return the current value of the bluetooth characteristic, or None if an error occurred.
+
+        :type as_type: str
+        :return: The value of the characteristic.
+        :rtype: int, None
+        """
+        #use the last value written to characteristic
+        value = self.value 
+        try:
+            return int.from_bytes(value, "big")
+        except Exception as e:
+            return None
+
+
+class NanoBot:
+    """
+    Interact with Arduino and peripheral hardware for movement and sensing.
+
+    :param saturated_duty: The maximum duty cycle to use for the motors. This can be increased to compensate somewhat for lower battery voltage.
+    """
+    def __init__(self, saturated_duty=22000, *args, **kwargs):
+
+        # turn ir sensor pin on (inactive because it's active low)
+        self.ir_right_sensor = Pin(28, Pin.OUT)
+        self.ir_right_sensor.on()
+
+        time.sleep(0.5)
+
+        # ir sensors
+        self.ir_left_sensor = ADC(Pin(29, Pin.IN))
+        self.ir_right_sensor = ADC(Pin(28, Pin.IN))
+
+        # initialize frequency
+        machine.freq(100000000)
+
+        # initialize motors
+        m1pin1 = Pin(21)
+        m1pin2 = Pin(4)
+        m2pin1 = Pin(18)
+        m2pin2 = Pin(17)
+
+        self.m1pwm1 = PWM(m1pin1)
+        self.m1pwm2 = PWM(m1pin2)
+        self.m2pwm1 = PWM(m2pin1)
+        self.m2pwm2 = PWM(m2pin2)
+
+        # initialize motor constants
+        self.max_duty = 65535 # constant
+        self.saturated_duty = saturated_duty # choice for max speed
+        assert(0 <= self.saturated_duty <= self.max_duty)
+        self.turn90ticks = 120
+        self.turn_error = 5
+        self.block_delay = 1550
+
+        # PID controller constants
+        self.battery_scaling = 1.05
+        self.kp = 0.8 * self.battery_scaling
+        self.ki = 0.08 * self.battery_scaling
+        self.kd = 0.04 * self.battery_scaling
+
+        # initialize encoder variables
+        self.encpins = (15, 25, 7, 27)
+        self.enc1p1 = Pin(self.encpins[0], Pin.IN)
+        self.enc1p2 = Pin(self.encpins[1], Pin.IN)
+        self.enc2p1 = Pin(self.encpins[2], Pin.IN)
+        self.enc2p2 = Pin(self.encpins[3], Pin.IN)
+
+        self.enc1 = 0
+        self.enc2 = 0
+        self.enc1dir = 1
+        self.enc2dir = 1
+
+        # add interrupt callbacks to track encoder ticks
+        self.enc1p1.irq(lambda pin: self.enc_pin_high(self.encpins[0]), Pin.IRQ_RISING)
+        self.enc1p2.irq(lambda pin: self.enc_pin_high(self.encpins[1]), Pin.IRQ_RISING)
+        self.enc2p1.irq(lambda pin: self.enc_pin_high(self.encpins[2]), Pin.IRQ_RISING)
+        self.enc2p2.irq(lambda pin: self.enc_pin_high(self.encpins[3]), Pin.IRQ_RISING)
+
+        self.setup()
+
+    def enc_pin_high(self, pin):
+        if pin == self.encpins[0] or pin == self.encpins[1]:
+            if self.enc1p1.value() == 1 and self.enc1p2.value() == 1:
+                self.enc1 += 1 * self.enc1dir
+            elif self.enc1p1.value() == 1:
+                self.enc1dir = 1
+            else:
+                self.enc1dir = -1
+        if pin == self.encpins[2] or pin == self.encpins[3]:
+            if self.enc2p1.value() == 1 and self.enc2p2.value() == 1:
+                self.enc2 += 1 * self.enc2dir
+            elif self.enc2p1.value() == 1:
+                self.enc2dir = -1
+            else:
+                self.enc2dir = 1
+
+    def calc_duty(self, duty_100):
+        return int(duty_100 * self.max_duty / 100)
+
+    def m1_forward(self, duty_cycle):
+        self.m1pwm1.duty_u16(min(self.calc_duty(duty_cycle), self.saturated_duty))
+        self.m1pwm2.duty_u16(0)
+
+    def m2_backward(self, duty_cycle):
+        self.m1pwm1.duty_u16(0)
+        self.m1pwm2.duty_u16(min(self.calc_duty(duty_cycle), self.saturated_duty))
+
+    def m1_signed(self, duty_cycle):
+        if duty_cycle >= 0:
+            self.m1_forward(duty_cycle)
+        else:
+            self.m2_backward(-duty_cycle)
+
+    def m2_forward(self, duty_cycle):
+        self.m2pwm1.duty_u16(min(self.calc_duty(duty_cycle), self.saturated_duty))
+        self.m2pwm2.duty_u16(0)
+
+    def m2_backward(self, duty_cycle):
+        self.m2pwm1.duty_u16(0)
+        self.m2pwm2.duty_u16(min(self.calc_duty(duty_cycle), self.saturated_duty))
+
+    def m2_signed(self, duty_cycle):
+        if duty_cycle >= 0:
+            self.m2_forward(duty_cycle)
+        else:
+            self.m2_backward(-duty_cycle)
+
+    def stop(self):
+        """
+        Turn off all motors.
+        """
+        # set all duty cycles to 0
+        self.m1pwm1.duty_u16(0)
+        self.m1pwm2.duty_u16(0)
+        self.m2pwm1.duty_u16(0)
+        self.m2pwm2.duty_u16(0)
+
+    def setup(self):
+        # initialize frequencies
+        self.m1pwm1.freq(1000)
+        self.m1pwm2.freq(1000)
+        self.m2pwm1.freq(1000)
+        self.m2pwm2.freq(1000)
+
+    def ir_left(self):
+        """
+        Return true if the left IR sensor detects white.
+        """
+        return self.ir_left_sensor.read_u16() < 65535 // 2
+
+    def ir_right(self):
+        """
+        Return true if the right IR sensor detects white.
+        """
+        return self.ir_right_sensor.read_u16() < 65535 // 2
+
+    def get_enc1(self):
+        return self.enc1
+
+    def get_enc2(self):
+        return self.enc2
+
+    def set_enc1(self, value):
+        self.enc1 = value
+
+    def set_enc2(self, value):
+        self.enc2 = value

_sources/bluetooth.rst.txt

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+.. _Bluetooth:
+
+Bluetooth
+=========
+Using Bluetooth Low Energy (BLE) to communicate with the NanoNav.
+
+Quick Example
+-------------
+
+.. code-block:: python
+
+    from nanonav import BLE
+
+    # Create a Bluetooth object
+    ble = BLE(name="NanoNav")  
+
+    ble.send(43)
+    response = ble.read()
+    # wait until something changes, indicating a response
+    while response == 43:
+        response = ble.read()
+
+    print("Received: ", response)
+
+Usage
+-----
+
+.. autoclass:: nanonav.BLE     
+    :members: 
+
+.. note::
+  Just as a heads up, we've noticed that occasionally the value stored on the BLE characteristic gets corrupted. Wherever you call the `read` method, it's a good idea to verify that 
+  the value is within the range you expect (and not ``None``), and if not, consider requesting the value again.   
+
+Connecting from Mobile
+----------------------
+
+Various mobile apps are available for communicating with Bluetooth Low Energy. We recommend LightBlue which is available for both iOS and Android.
+After downloading and installing it, you will need to turn your phone's Bluetooth on and open the app (no pairing is needed for Bluetooth Low Energy).
+
+If the NanoNav is waiting for a BLE connection, you will see it as one of the connection options in LightBlue. You may need to scroll down to find it.
+
+.. note::
+    On some versions of iOS, the BLE devices are automatically renamed, and NanoNav's connection may show up as "Arduino" or something else. If you find yourself in this 
+    situation, it can be helpful to search for the service id instead. TODO: add explanation for how this can be done.
+
+.. image:: images/lightblue_devices_view.png
+  :width: 400
+  :alt: LightBlue Application with Bluetooth connections available
+
+After clicking the connect button, you will see a screen like this, which gives information about the connection.
+
+.. image:: images/lightblue_connected_view.png
+  :width: 400
+  :alt: LightBlue Application after connecting to device
+
+It is possible to configure the BLE for more complex behavior, but with this kit we only need to send small numbers back and forth with the Arduino. Click on the 
+option at the bottom (highlighted in red in the above screenshot) to open the portal where you can perform this simplified communication with NanoNav. 
+
+.. image:: images/lightblue_characteristic_view.png
+  :width: 400
+  :alt: LightBlue display of BLE characteristic, with options to read or write values to it
+
+You can think of a BLE connection as a secret whiteboard that you and your friend share. There is always some number written on it, and each of you 
+can look at (read) whatever is on it whenever you like, and can also change (write to) it whenever you like. Inside the LightBlue app, as shown in the 
+above picture, you can click the :blue:`Read Again` button as often as you would like, but the value will only
+change when you (or NanoNav) writes to it. And you can send a number as often as you want in LightBlue, but NanoNav will not know unless you program it to 
+read the value periodically. (Actually, you can setup BLE interrupts for NanoNav to run code when something changes in the BLE connection, similar to the :py:meth:`~nanonav.BLE.on_connected` and :py:meth:`~nanonav.BLE.on_disconnected`, but we think 
+you'll have an easier time getting your code to work as expected by avoiding that kind of programming for now).
+If interested in learning about other bluetooth capabilities beyond the scope of NanoNav, see `here <https://docs.micropython.org/en/latest/library/bluetooth.html>`_.

_sources/faq.rst.txt

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+FAQ
+===
+
+No questions yet.
+
+Issues
+------
+
+Found a bug? Create an issue on GitHub. Submit `here <https://github.com/Bram-Hub/NanoNav/issues>`_ with as much information as you can provide
+about the context of the bug.

_sources/index.rst.txt

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+.. NanoNav documentation master file, created by
+   sphinx-quickstart on Mon Apr 15 12:52:38 2024.
+   You can adapt this file completely to your liking, but it should at least
+   contain the root `toctree` directive.
+
+Welcome to NanoNav's documentation.
+===================================
+
+Check out the :doc:`usage` section to get started.
+
+Contents
+--------
+
+.. toctree::
+
+   usage
+   bluetooth 
+   movement
+   sensors
+   faq
+