modular-print/read_values.py

# read the values from Arduino:
import serial # import serial library to read the values from Arduino Uno via serial (usb) connection
import os # library to use bash commands

from friction_label import friction_label
from future_relics import future_relics
from print_output import print_output

function_index = {
"FL": friction_label,
"FR": future_relics
}

module_index = {
"FL": "friction_label",
"FR": "future_relics"
}


if __name__ == '__main__':
    ser = serial.Serial('/dev/ttyS0', 9600, timeout=1) # establish a serial connection using Serial Pi Zero (S0), using the RX $
    ser.reset_input_buffer()

    while True:
        if ser.in_waiting > 0:

            line = ser.readline() # reads bytes
            try:
                line = line.decode("utf-8", 'ignore').rstrip() # converts bytes to string
                line = line.replace("\r\n", "") # replaces "\r\n" (end of line) with nothing
                line = line.replace("\r", "") # replaces "\r" (between two modules) with nothing
                line = line.split("#") # splits the line into a list of lists
                # after this split the list begins with an empty list, so delete it:
                if line[0] == "": #if first list in lists is empty:
                    del line[0] #delete the first element
 #               print(line)
                modules = []
                for module in line:
                    values = module.split(",") # splits each module into values
                    modules.append(values)
                print("These are the values of each module inside a list of modules ")
                print(modules)

                previous_module = ""
                for module in modules: #for each module inside the list of modules
                    if module[0] not in module_index: #this if break is added to avoid the script from breaking at the start (which happens when serial is not yet receiving all values, but only fragments)
                        # print("break")
                        break # break and start the for loop again
                    function_index[module[0]](previous_module, module) #use function_index to run functions for each module

                    previous_module = module_index[module[0]] #use module_index to replace abbr. with full name
                    if module == modules[-1]: #if module is the last module in list of modules
                        final_module = module_index[module[0]] #use name of the last module to define final_module
#                        print(final_module)
                        print_output(final_module) #call print_output function with last_module as variable

            except OSError as e:
                print("Error: could not decode bytes")
                print(e)