ラズパイ用UPS４のプログラムについて

ラズベリーパイ4を使っている初心者です。

ラズパイ4のUPSを購入しそれに使うソフトを使おうとしてます。
upsの状態を見るソフトなのですが実行するとエラーが出ます。
どうすればいいか教えていただければと思います。
よろしくお願いします。

発生している問題・エラーメッセージ


Python 3.7.3 (/usr/bin/python3)
>>> %Run UPS_GUI_demo.py
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 265, in open
    self.fd = os.open(self.portstr, os.O_RDWR | os.O_NOCTTY | os.O_NONBLOCK)
PermissionError: [Errno 13] Permission denied: '/dev/ttyAMA0'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/pi/UPSPACK_V3/UPS_GUI_py/UPS_GUI_demo.py", line 10, in <module>
    test = UPS2("/dev/ttyAMA0")
  File "/home/pi/UPSPACK_V3/UPS_GUI_py/upspackv2.py", line 11, in __init__
    self.ser  = serial.Serial(port,9600)
  File "/usr/lib/python3/dist-packages/serial/serialutil.py", line 240, in __init__
    self.open()
  File "/usr/lib/python3/dist-packages/serial/serialposix.py", line 268, in open
    raise SerialException(msg.errno, "could not open port {}: {}".format(self._port, msg))
serial.serialutil.SerialException: [Errno 13] could not open port /dev/ttyAMA0: [Errno 13] Permission denied: '/dev/ttyAMA0'
>>>

該当のソースコード

python
1#!/usr/bin/python3
2
3from upspackv2 import *
4import tkinter as tk
5import re
6import serial
7import time
8
9
10test = UPS2("/dev/ttyAMA0")
11
12
13def reflash_data():
14    version,vin,batcap,vout = test.decode_uart()
15#    loc_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
16    cur_time = time.time()
17    cur_time = cur_time - load_time
18#    print(cur_time)
19    
20    
21    
22    time_var.set("Running: "+str(int(cur_time)) + "s")
23    
24    
25    
26    batcap_int = int(batcap)
27#    print(type(batcap_int))
28    
29    if vin == "NG":
30        vin_lable.config(bg = "red")
31        vin_var.set("Power NOT connected!")
32    else:
33        vin_lable.config(bg = "green")
34        vin_var.set("Power connected!")
35                  
36    if batcap_int< 30:
37        cap_lable.config(bg = "red")
38        if batcap_int == 1:
39            cur_time = time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))
40            stop_time = "\nHalt time :"+cur_time
41            with open("log.txt","a+") as f:
42                f.write(stop_time)
43            os.system("sudo shutdown -t now")
44            sys.exit()            
45    else:
46        cap_lable.config(bg = "green")
47    
48    
49    cap_var.set("Battery Capacity: "+str(batcap)+"%")
50    vout_var.set("Output Voltage: "+vout+" mV")
51
52    window.after(1000,reflash_data)
53
54def hit_exit():
55    window.destroy()
56
57    
58
59#loc_time = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())
60#print(loc_time) 
61load_time = time.time()
62
63#cur_time = time.strftime('%Y-%m-%d %H:%M:%S',time.localtime(time.time()))
64#start_time = "\nStart time :"+cur_time
65
66#with open("log.txt","a+") as f:
67#    f.write(start_time)
68
69window = tk.Tk()
70window.title("UPS GUI demo")
71window.geometry("400x200")
72
73time_var = tk.StringVar()
74ver_var = tk.StringVar()
75vin_var = tk.StringVar()
76vout_var = tk.StringVar()
77cap_var = tk.StringVar()
78
79version,vin,batcap,vout = test.decode_uart()
80ver_var.set("Smart UPS "+version)
81
82ver_lable = tk.Label( window,
83          textvariable = ver_var,
84#                      bg = "green",
85          font = ("Arial",12),
86          width = 20,height = 2)
87ver_lable.pack()
88
89
90
91time_lable = tk.Label( window,
92          textvariable = time_var,
93          bg = "green",
94          font = ("Arial",12),
95          width = 20,height = 2)
96
97time_lable.place(x=10, y=50, anchor='nw')
98
99
100
101vin_lable = tk.Label( window,
102          textvariable = vin_var,
103          bg = "green",
104          font = ("Arial",12),
105          width = 20,height = 2)
106
107vin_lable.place(x=210, y=50, anchor='nw')
108
109
110cap_lable = tk.Label( window,
111          textvariable = cap_var,
112          bg = "green",
113          font = ("Arial",12),
114          width = 20,height = 2)
115
116cap_lable.place(x=10, y=100, anchor='nw')
117
118
119vout_lable = tk.Label( window,
120          textvariable = vout_var,
121          bg = "green",
122          font = ("Arial",12),
123          width = 20,height = 2)
124
125vout_lable.place(x=210, y=100, anchor='nw')
126
127
128b1 = tk.Button(window,
129  text = "Exit",
130  width = 30,height = 2,
131  command = hit_exit)
132b1.place(x=70, y=150, anchor='nw')
133
134
135window.after(100,reflash_data)
136
137window.mainloop()
138