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obniz.py: sdk for python

This sdk is currently out of maintenance.

  • You can use this on obnizOS 1.X.X or 2.X.X, but cannot use 3.X.X.
  • You can use only with obniz board / obniz Board 1Y. Other devices is not supported.

image

obniz sdk for python. You can use obnizBoard or obnizOS.

Control obniz from python.

This sdk works with obniz api.

Compatible with Python 3.6+.

Usage

    import asyncio

    from obniz import Obniz


    async def onconnect(obniz):
        obniz.io0.drive("5v")
        obniz.io0.output(True)
        obniz.io1.pull("3v")
        obniz.io1.drive("open-drain")
        obniz.io1.output(False)
        obniz.io2.drive("3v")
        obniz.io2.output(True)

        def callback(voltage):
            print("change to {} v".format(voltage))

        obniz.ad3.start(callback)

        pwm = obniz.get_free_pwm()
        pwm.start({"io": 4})
        pwm.freq(1000)
        pwm.duty(50)

        uart = obniz.getFreeUart()
        uart.start({"tx": 5, "rx": 6, "baud": 9600})

        def onreceive(data, text):
            print(data)

        uart.onreceive = onreceive

        uart.send("Hello")


    obniz = Obniz('0000-0000')
    obniz.onconnect = onconnect

    asyncio.get_event_loop().run_forever()

Installation

Install obniz via pip

  pip install obniz

and import it on python file.

  from obniz import Obniz

Connect

Details on doc/connection

To use obniz, instantiate obniz with obniz id. and set onconnect callback function. It will be called when connected to obniz successfully.

    import asyncio


    async def onconnect(obniz):
        pass


    obniz = Obniz('0000-0000')
    obniz.onconnect = onconnect

    asyncio.get_event_loop().run_forever()

You are able to use everything on obniz after connect.

    async def onconnect(obniz):
        obniz.io0.drive("5v")
        obniz.io0.output(True)
        obniz.io1.pull("3v")
        obniz.io1.drive("open-drain")
        obniz.io1.output(False)
        obniz.io2.drive("3v")
        obniz.io2.output(True)

        def callback(voltage):
            print("change to {} v".format(voltage))

        obniz.ad3.start(callback)

        pwm = obniz.get_free_pwm()
        pwm.start({"io": 4})
        pwm.freq(1000)
        pwm.duty(50)

        uart = obniz.getFreeUart()
        uart.start({"tx": 5, "rx": 6, "baud": 9600})

        def onreceive(data, text):
            print(data)

        uart.onreceive = onreceive

        uart.send("Hello")

Example

Easy to integrate python libraries like TensorFlow. (need to install tensorflow and opencv-python)

    import asyncio

    from obniz import Obniz

    import cv2
    import numpy as np
    import tensorflow as tf
    from tensorflow import keras

    class_names = ['T-shirt/top', 'Trouser', 'Pullover', 'Dress', 'Coat',
                'Sandal', 'Shirt', 'Sneaker', 'Bag', 'Ankle boot']

    fashion_mnist = keras.datasets.fashion_mnist

    (train_images, train_labels), (test_images, test_labels) = fashion_mnist.load_data()

    train_images = train_images / 255.0

    test_images = test_images / 255.0

    model = keras.Sequential([
        keras.layers.Flatten(input_shape=(28, 28)),
        keras.layers.Dense(128, activation=tf.nn.relu),
        keras.layers.Dense(10, activation=tf.nn.softmax)
    ])

    model.compile(optimizer=tf.train.AdamOptimizer(),
                loss='sparse_categorical_crossentropy',
                metrics=['accuracy'])

    model.fit(train_images, train_labels, epochs=5)

    test_loss, test_acc = model.evaluate(test_images, test_labels)

    print('Test accuracy:', test_acc)

    def set_angle(pwm, angle):
        max = 2.4
        min = 0.5
        val = ((max - min) * angle) / 180.0 + min
        pwm.pulse(val)


    async def onconnect(obniz):
        obniz.io0.output(False)
        obniz.io1.output(True)

        pwm = obniz.get_free_pwm()
        pwm.start({"io": 2})
        pwm.freq(50)

        cap = cv2.VideoCapture(0)

        prev = None

        while True:
            ret, frame = cap.read()

            frame = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

            ret, frame = cv2.threshold(frame, 127, 255, cv2.THRESH_BINARY_INV)

            height, width = frame.shape
            x = height if height < width else width
            y = height if height < width else width
            square= np.zeros((x, y), np.uint8)

            x1 = int((width-x)/2)
            x2 = int(width-(width-x)/2)
            y1 = int((height-y)/2)
            y2 = int(height-(height-y)/2)
            square = frame[y1:y2, x1:x2]

            cv2.imshow("frame", square)

            img = cv2.resize(square, (28, 28), interpolation = cv2.INTER_AREA)

            img = (np.expand_dims(img / 255.0, 0))

            predictions_single = model.predict(img)

            answer = np.argmax(predictions_single[0])

            if prev != answer:
                print("answer: {}".format(class_names[answer]))
                set_angle(pwm, answer / 9 * 180)

            prev = answer

            if cv2.waitKey(1) & 0xFF == ord('q'):
                asyncio.get_event_loop().stop()
                break

            await asyncio.sleep(0.1)

        cap.release()
        cv2.destroyAllWindows()

    obniz = Obniz('0000-0000')
    obniz.debugprint = True
    obniz.onconnect = onconnect

    asyncio.get_event_loop().run_forever()

Documentation

You can find the documentation on the website.