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Read data from a serial port and plot
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| # !pip3 install pyserial | |
| import serial | |
| ser = serial.Serial('/dev/cu.usbmodem1101') # open serial port | |
| print(ser.name) # check which port was really used | |
| ser.close() | |
| data = {} | |
| material = 'Pencil' | |
| ser = serial.Serial('/dev/cu.usbmodem1101', 115200, timeout=10) | |
| # while True: | |
| # # x = ser.read() # read one byte | |
| # # s = ser.read(100) # read up to ten bytes (timeout) | |
| # line = ser.readline() # read a '\n' terminated line | |
| # print(line) | |
| # 5V with 10 bit ADC | |
| conversion = 5/1023 | |
| start = False | |
| data = [] | |
| index = [] | |
| with open(f'sensor_data_{material}.csv', 'wb') as datafile: | |
| while True: | |
| # datafile.write(ser.read(10000)) | |
| line = ser.readline() | |
| # if start: | |
| print(line) | |
| datafile.write(line) | |
| try: | |
| value = int(line.strip()) | |
| except: | |
| value = -1 | |
| # if value > 10: | |
| # start = True | |
| index.append(len(data)) | |
| data.append(value * conversion) | |
| # datafile.write(ser.read(10000)) |
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| # !pip3 install bokeh | |
| from bokeh.models import Range1d | |
| from bokeh.plotting import figure, show | |
| p = figure(title=f'Testing with: {material}', width=1000, height=800) | |
| p.y_range = Range1d(0, 5) # max 5 volts | |
| # add a circle renderer with a size, color, and alpha | |
| p.line(index,data, line_width=2, color="navy", alpha=0.5) | |
| # show the results | |
| show(p) |
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