Hi all, I am working on a Raspberry PI and am trying to find a way so that when the end user presses a button a command is executed for the module and and it starts to scan. It is a Waveshare barcode scanner module. [image] This is the only clue (see image) I have from the manual ( https://www.w…

Is there a reason why you cannot use the USB interface of the module? Also note: If the module uses 5V on the TX or RX you will have to use a level converter to connect it to your Pi, which is strictly 3.3V.

I really don't know as they only wrote "Operating voltage: 5V" But I've connected it to the USB port so it's not a problem.

As fkristofb writes and it says in the manual it is 5V ttl. You cannot connect 5v ttl to the gpio pins, otherwise you will destroy the raspberry pi. I haven't found out what kind of usb adapter comes with your scanner, but it says in the manual that if you want to connect it to a PC, you must use T…

Sending UART command to barcode scanner

General

fkristofb 11 November 2022 13:03 3

Thanks for your reply

Sorry I thougth that UART command can only be sent by the TXD-RXD pins. If it's not the case I suppose I can manage it somehow if it's essentially more simple.

I'm not sure what you mean by needing a level converter
On the manufacturer's site (Barcode Scanner Module, 1D/2D Codes Reader) under specifications they wrote "Operating voltage: 5V" and the PI has a 5V (and a 3.3V) pin.

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Sending UART command to barcode scanner

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