I have a 3 in 1 winsen gas sensor module that detects the concentration of 02,CO and CH4 it a modified module from a 4 in 1 gas sensor module (there are no libraries available for this module)
My question : how do I read it's data because the datasheet doesn't provide any information of how the data is streamed
Welcome to the forum
Please post a link to the datasheet
and i am using ESP8266 to interface
The module appears to have an RS 485 interface
but the "datasheet" has, as you say, no details of the serial protocol used. You could connect to its interface and see what your receive at various baud rates but without further details your chances of success are low
That "datasheet" is all they provide on their website
but it states "The module can output
the current concentration values of the four gases in real time through the digital serial port output."
If you have, or can get the hardware to read the serial port then give it a try
okay, since Serial.read can only read 1 byte at a time how can I read multiple bytes?
Read it byte by byte and save it for use later
Also mind that the Arduino uses a TTL UART, not RS485 as that sensor. You need a chip like the MAX485 to convert from RS485 to TTL. For easy prototyping there are inexpensive modules available that have the MAX485 and supporting components in place.
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