57 lines
2.3 KiB
Python
57 lines
2.3 KiB
Python
# These two modules allow us to run a web server.
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from flask import Flask, render_template
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from flask_socketio import SocketIO
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from tfluna import TFLuna
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# This module lets us pick random numbers, you can remove it later.
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import random
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# Here, we create the neccesary base app. You don't need to worry about this.
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app = Flask(__name__)
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socketio = SocketIO(app)
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tfluna = TFLuna()
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tfluna.open()
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tfluna.set_samp_rate(10)
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def printLidar():
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distance, strength, temperature = tfluna.read()
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lidarValues = {distance, strength, temperature}
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return str(lidarValues)
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# When someone requests the root page from our web server, we return 'index.html'.
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@app.route('/')
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def index():
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return render_template('index.html')
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# This function runs in the background to transmit data to connected clients.
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def background_thread():
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while True:
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# We sleep here for a single second, but this can be increased or decreased depending on how quickly you want data to be pushed to clients.
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socketio.sleep(0.1)
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# Then, we emit an event called "update_data" - but this can actually be whatever we want - with the data being a dictionary
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# where 'randomNumber' is set to a random number we choose here. You should replace the data being sent back with your sensor data
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# that you fetch from things connected to your Pi.
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socketio.emit(
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'update_data',
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{
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'randomNumber': random.randint(1, 100),
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# you can add more here! for instance, something along the lines of:
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# 'mySensor': mysensor.get_sensor_data(),
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'lidar': printLidar()
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}
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)
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# To add a your first new sensor, try giving https://docs.aerospacejam.org/getting-started/first-sensor a read!
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# This function runs when someone connects to the server - and all we do is start the background thread to update the data.
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@socketio.on('connect')
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def handle_connect():
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print('Client connected')
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socketio.start_background_task(target=background_thread)
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# This function is called
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def main():
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# These specific arguments are required to make sure the webserver is hosted in a consistent spot, so don't change them unless you know what you're doing.
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socketio.run(app, host='0.0.0.0', port=8085, allow_unsafe_werkzeug=True)
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if __name__ == '__main__':
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main()
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