Raspberry pi Barcode Scanner
In this tutorial, we are going to build a Raspberry Pi 3 based barcode Scanner. We provide steps to set up a USB barcode scanner with the Raspberry Pi. And tell you how it works.
First of all, You need these parts to use a barcode scanner using raspberry pi3.
Parts :
Raspberry Pi 3: https://amzn.to/39WWelV
Power Adapter(4 Amp) : https://amzn.to/3a1Pu62
16GB micro SD Card: https://amzn.to/2PKdvrH
USB Barcode Scanner: https://amzn.to/3taYEoq
Setup Steps :
Step 1. Plug in the USB Barcode Scanner into Raspberry Pi3.
Step 2. Boot Raspberry Pi and open the terminal
Type this command “sudo raspi-config“
Step 3. Go to interfacing options and enable the “Serial” option
Step 4. Install dependencies Type this command “pip install requests“
Step 5. Go to this site https://upcdatabase.org/ and create a account and take api key
Step 6. Enter Your https://upcdatabase.org/ API KEY in Line no 6
Step 7. Type this command “sudo python barcode.py” to run the script (press ctrl+c to exit the script)
Dependencies:
“pip install requests“
Code:
RUN SCRIPT IN SUDO
sudo python
barcode.py
#!/usr/bin/python
import sys
import requests
import json
api_key = “ENTER YOUR API KEY HERE” #https://upcdatabase.org/
def barcode_reader():
“””Barcode code obtained from ‘brechmos’
https://www.raspberrypi.org/forums/viewtopic.php?f=45&t=55100"""
hid = {4: ‘a’, 5: ‘b’, 6: ‘c’, 7: ‘d’, 8: ‘e’, 9: ‘f’, 10: ‘g’, 11: ‘h’, 12: ‘i’, 13: ‘j’, 14: ‘k’, 15: ‘l’, 16: ‘m’,
17: ’n’, 18: ‘o’, 19: ‘p’, 20: ‘q’, 21: ‘r’, 22: ‘s’, 23: ‘t’, 24: ‘u’, 25: ‘v’, 26: ‘w’, 27: ‘x’, 28: ‘y’,
29: ‘z’, 30: ‘1’, 31: ‘2’, 32: ‘3’, 33: ‘4’, 34: ‘5’, 35: ‘6’, 36: ‘7’, 37: ‘8’, 38: ‘9’, 39: ‘0’, 44: ‘ ‘,
45: ‘-’, 46: ‘=’, 47: ‘[‘, 48: ‘]’, 49: ‘\\’, 51: ‘;’, 52: ‘\’’, 53: ‘~’, 54: ‘,’, 55: ‘.’, 56: ‘/’}
hid2 = {4: ‘A’, 5: ‘B’, 6: ‘C’, 7: ‘D’, 8: ‘E’, 9: ‘F’, 10: ‘G’, 11: ‘H’, 12: ‘I’, 13: ‘J’, 14: ‘K’, 15: ‘L’, 16: ‘M’,
17: ’N’, 18: ‘O’, 19: ‘P’, 20: ‘Q’, 21: ‘R’, 22: ‘S’, 23: ‘T’, 24: ‘U’, 25: ‘V’, 26: ‘W’, 27: ‘X’, 28: ‘Y’,
29: ‘Z’, 30: ‘!’, 31: ‘@’, 32: ‘#’, 33: ‘$’, 34: ‘%’, 35: ‘^’, 36: ‘&’, 37: ‘*’, 38: ‘(‘, 39: ‘)’, 44: ‘ ‘,
45: ‘_’, 46: ‘+’, 47: ‘{‘, 48: ‘}’, 49: ‘|’, 51: ‘:’, 52: ‘“‘, 53: ‘~’, 54: ‘<’, 55: ‘>’, 56: ‘?’}
fp = open(‘/dev/hidraw0’, ‘rb’)
ss = “”
shift = False
done = False
while not done:
## Get the character from the HID
buffer = fp.read(8)
for c in buffer:
if ord(c) > 0:
## 40 is carriage return which signifies
## we are done looking for characters
if int(ord(c)) == 40:
done = True
break;
## If we are shifted then we have to
## use the hid2 characters.
if shift:
## If it is a ‘2’ then it is the shift key
if int(ord(c)) == 2:
shift = True
## if not a 2 then lookup the mapping
else:
ss += hid2[int(ord(c))]
shift = False
## If we are not shifted then use
## the hid characters
else:
## If it is a ‘2’ then it is the shift key
if int(ord(c)) == 2:
shift = True
## if not a 2 then lookup the mapping
else:
ss += hid[int(ord(c))]
return ss
def UPC_lookup(api_key,upc):
‘’’V3 API’’’
url = “https://api.upcdatabase.org/product/%s/%s" % (upc, api_key)
headers = {
‘cache-control’: “no-cache”,
}
response = requests.request(“GET”, url, headers=headers)
print(“ — — -” * 5)
print(upc)
print(json.dumps(response.json(), indent=2))
print(“ — — -” * 5 + “\n”)
if __name__ == ‘__main__’:
try:
while True:
UPC_lookup(api_key,barcode_reader())
except KeyboardInterrupt:
pass
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