Barcode Scanner Setup
The Waveshare Barcode Scanner Module is a small 1D/2D scan engine with onboard USB and UART. Plugged into a USB port it acts as a HID keyboard ("keyboard wedge"): it types the scanned code into whatever field is focused, so it works on the Add Food page out of the box with no software setup.
By default it only scans while you hold the button. For a kitchen kiosk you usually want it hands-free: present a product and it scans on its own. This page has the configuration codes to do that. You set the module by scanning these codes with the module itself, so display this page on a screen (or print it) and scan each code in order.
These codes are taken from the official Waveshare "Barcode Scanner Module Setting Manual" (V2.1). The full manual has every other setting; this page collects just the ones that matter for a hands-free Pantry Raider kiosk.
- The module is configured by scanning configuration codes, not by software.
- Each code writes one setting. Scan them one at a time; the module beeps to confirm.
- A setting is not permanent until you scan Save as user default (last section), so a power cycle keeps it.
- If anything gets into a bad state, scan Restore factory setting and start over.
Tip: it is easiest to do this on a phone or laptop browser with this page open, the module pointed at the screen. Keep the module 4 to 15 cm from the screen and hold steady.
Scan these four codes in order, then the Save code at the bottom.
The module watches for a change in brightness (something entering its view), scans, then goes back to watching. No button press. You can still press the button to scan manually.
After a scan, how long the module waits before it starts watching again. The default is 1 s; 500 ms feels snappier at a checkout-style flow.
Without this, leaving an item in front of the sensor re-scans it many times. This turns on a cooldown so the same barcode is not read again right away.
The cooldown length for the setting above. 3 s suits adding groceries one at a time. Use the 5 s code in the Optional section instead if you find items getting double-counted.
Pantry Raider already de-duplicates: scanning the same barcode again just bumps the item's quantity on the pending list rather than creating a second row. The hardware delay above is still worth setting so the sensor does not flood the queue while an item sits in view.
Scan this last so the configuration survives a power cycle.
Makes the module quicker to react when something enters its field of view. Handy if Sensing Mode feels sluggish; can cause more stray scans in a busy area.
How long the module settles the image after detecting a change before it scans. Default is 400 ms; 100 ms is more responsive.
Use instead of the 3 s code if single items are being scanned more than once.
Scans on a repeating timer whether or not something is in view. Simpler than Sensing Mode but reads more aggressively, so you get more stray scans. Single-press the button to pause or resume. Prefer Sensing Mode for a kiosk.
Returns the module to the default, where it only scans while you hold the button.
A USB-connected module should already act as a keyboard. If it ever stops typing into the page (for example after a factory reset that left it in serial mode), scan these two to put it back in keyboard-wedge mode.
If the module is misconfigured, scan this to return everything to factory defaults, then redo the recommended codes above.
Once the module is in Sensing Mode, open the Add Food page and present a barcode. The code is captured anywhere on the page (you do not need to click into a field first), looked up against Open Food Facts with your defaults applied, and saved to Pending. Review and commit from the Pending page. On a Pi Remote the scan is saved on the main server, so it shows up in the server's Pending list and on every device at once.
See also: Headless wireless barcode scanner via Home Assistant
for the alternative keyboard_remote automation path.