Skip to content

Yrr0r/paperang-web

Folders and files

NameName
Last commit message
Last commit date

Latest commit

 

History

5 Commits
 
 
 
 
 
 
 
 
 
 
 
 

Repository files navigation

WebBLE with Paperang

Prints redered markdown. Paper not padded after print finishes. Manual pull is required at the moment to get the full print area.

Some useful BLE related constants:

  • Service ID: 49535343-fe7d-4ae5-8fa9-9fafd205e455
  • Characteristic value to write to: 49535343-6daa-4d02-abf6-19569aca69fe
  • Characteristic value to receive from the printer: 49535343-1e4d-4bd9-ba61-23c647249616 This is a NOTIFY character.

Some other tips on printing

  • BLE has a max data packet of 512, means 502 bytes of useful data. However, I found out that each packet should not contain unfinished lines otherwise they tear. So I rounded to 480 for 48 bytes per line on P1.

Other than just printing

All send and receive data command byte are in const.txt. Send and receive has (almost) same data structure. When a packet is received, its also begin with 0x02 and end with 0x03.

2nd byte is command byte, then the first 5 and last 5 bytes are not very useful since I don't care about checksums so I discarded them. Then the last 11 bytes of whats remaining seems to be some kind of redundant addon data, so they are disregarded as well. Then only a handful of bytes will remain and they are easier to decode.

  • Reading ASCII stringed values (SN, model, board version...) : Just do the right truncating and decode the rest as ASCII.

  • Battery status: Send command 16, only one byte will remain after all the truncating. That byte is the percentage value directly usable. Do not divide it again by 255.

  • Get heat density: Send 28, then look at the first byte returned. Same as battery status. Do not divide by 255.

  • Feed line: The printer will feed blank paper of a specific length. Send command 26, then immediately followed by the amount of lines(in pixel) to be fed encoded as payload data.

  • Power-down time: Send 31, get a 2 byte integer. Notice it's little endian means reverse their byte order to read them. i.e. [16,14] or 0x100E indicate 3600 seconds, not 4110.

Some commands in the list are not implemented on the P1 model. I do not know whether it works on any other model.

About

WebBLE with Paperang printer.

Resources

Stars

Watchers

Forks

Releases

No releases published

Packages

No packages published