http://www.8051projects.net/ Learn to make simple microcontroller projects, pic, 8051, avr and arm projects. download 8051 projects, tutorials, libraries, sample codes. join the microcontroller discussion forum and ask doubts regarding electronics. the best source for 8051 over internet. en-gb 2008-12-01T22:59:32-08:00 contact@nospam.com hourly 1 2000-01-01T12:00+00:00 http://www.8051projects.net/forum-t10538.html 2008-12-01T22:59:32-08:00 are temperature sensor DS1620, DS1621, and DS1820 using the same set of asm coding? if the coding is for DS1620 but using DS1820 will it work? http://www.8051projects.net/forum-t10538.html 2008-12-01T22:59:32-08:00 Arun Kumar V Hello mic,you can interchange Ds1620 and Ds1621 and both will work on same code as they are 3 wire communication devices like SPI. but Ds1820 will not work with code written for the above two because it uses a 1- wire protocol Arun