same as read_values.py but for preview, not print

read_values_preview.py

@@ -0,0 +1,59 @@
+# 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 preview import preview
+
+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)
+                        preview(final_module) #call preview function with last_module as variable
+
+            except OSError as e:
+                print("Error: could not decode bytes")
+                print(e)