I attached here the link of data sheet of NDIR SJH_5 gas sensor https://cdn.shopify.com/s/files/1/0406/7681/files/Manual-Industrial-Grade-NDIR-Gas-Sensors-Cubic-GasLab.pdf?v=1630001730
and schematic circuit which is used.
and i will be doing an digital pin 0(Rx) and 1(TX)