Abstract: Mine handheld sensors such as methane, carbon monoxide, hydrogen sulfide and other sensors must be regularly adjusted after they leave the factory for ensuring the accuracy of electrochemical components, otherwise affecting the test results. Traditional calibration is based on single sensor using button control. The calibration proposed in this paper is to use single bus technology to calibrate multiple sensors. Single bus communication technology is the most primitive form of digital communication. Using single communication as communication medium, it is the simplest realization, the least hardware resources occupation, and the lowest cost compared with RS485/RS232, SPI, I2C and other communication technologies. The application of single bus communication technology in the adjustment of multi-handheld sensors will greatly save manpower and material resources and improve labor productivity under the condition of saving hardware resources.

Key words: single bus communication, handheld sensor, sensor calibration