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Commit ec854c1c authored by Jasper Franse's avatar Jasper Franse
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example coding

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%% Cell type:code id:clean-marsh tags:
``` python
# import warnings
# warnings.filterwarnings('ignore')
# import sys
# import os
# import shutil
# from pyrpl import Pyrpl
# import numpy as np
# import time
# import matplotlib.pyplot as plts
# import IPython
# import ipywidgets as widgets
# from bokeh.plotting import figure, show
# from bokeh.io import output_notebook, push_notebook
# from bokeh.layouts import column, row
# from bokeh.models import ColumnDataSource, Toggle, Range1d
# from scipy.signal import welch
# from datetime import datetime
#Arduino Serial connection
import serial
```
%% Cell type:code id:variable-composite tags:
``` python
ser = serial.Serial('COM9',9600,timeout=0.5)
ser.flush()
time.sleep(0.5)
ser.reset_input_buffer()
ser.write(b'at')
ser.write(b'ch1')
```
%% Output
---------------------------------------------------------------------------
FileNotFoundError Traceback (most recent call last)
/opt/conda/lib/python3.8/site-packages/serial/serialposix.py in open(self)
321 try:
--> 322 self.fd = os.open(self.portstr, os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK)
323 except OSError as msg:
FileNotFoundError: [Errno 2] No such file or directory: 'COM9'
During handling of the above exception, another exception occurred:
SerialException Traceback (most recent call last)
<ipython-input-5-ccbc81474993> in <module>
----> 1 ser = serial.Serial('COM9',9600,timeout=0.5)
2 ser.flush()
3
4 time.sleep(0.5)
5 ser.reset_input_buffer()
/opt/conda/lib/python3.8/site-packages/serial/serialutil.py in __init__(self, port, baudrate, bytesize, parity, stopbits, timeout, xonxoff, rtscts, write_timeout, dsrdtr, inter_byte_timeout, exclusive, **kwargs)
242
243 if port is not None:
--> 244 self.open()
245
246 # - - - - - - - - - - - - - - - - - - - - - - - -
/opt/conda/lib/python3.8/site-packages/serial/serialposix.py in open(self)
323 except OSError as msg:
324 self.fd = None
--> 325 raise SerialException(msg.errno, "could not open port {}: {}".format(self._port, msg))
326 #~ fcntl.fcntl(self.fd, fcntl.F_SETFL, 0) # set blocking
327
SerialException: [Errno 2] could not open port COM9: [Errno 2] No such file or directory: 'COM9'
%% Cell type:code id:rural-musical tags:
``` python
```
%% Cell type:code id:vulnerable-leone tags:
``` python
```
%% Cell type:code id:freelance-ticket tags:
``` python
```
%% Cell type:code id:continuing-article tags:
``` python
# Global variables
R = []
T = []
tm = []
Iavg = []
Iptp = []
Vavg = []
Vptp = []
t0 = time.time()
timer_t0 = time.time()
```
%% Cell type:code id:verbal-blame tags:
``` python
def get_temperature(serial_port, baudrate, timeout):
# serial_port='COM7', baudrate=9600, timeout=1
#variables (could be adjusted to inputs?)
alpha = 4.1139e-3; R0 = 1000; R1=1081; Vin=3.272 #should be according to literature: alpha = 3.85e-3 & R0 = 1000
#open Serial port to Arduino + flush what's still on it
ser = serial.Serial(serial_port,baudrate,timeout=0.5)
ser.flush()
#sent command to Arduino so we can read it out:
time.sleep(0.5) #needs to sleep, otherwise we get a: 'can not convert float... at the Vout-line'
ser.reset_input_buffer()
ser.write(b'g')
#Serial read + Temperature calculations:
serial_reply = ser.readline()
try:
Vout = float(str(serial_reply.decode("utf-8")))*(Vin/1023.0) #calculates the voltage from the voltage divider (over the PT1000)
except:
return serial_reply
Rpt = (Vout*R1)/(Vin-Vout) #calculates the resistance of the PT1000
Temp_C = ((Rpt/R0)-1)/alpha #with the above calculated resistance and 'known' variable we calculate the temperature in Celsius
Temp_K = Temp_C + 273.15 #Temperature in Kelvin
return Temp_K
```
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