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. Thu, 20 Nov 2008 21:28:30 -0800 http://backend.userland.com/rss092 Hi,I have problem writing a code for the shaft encoder to decode for my PIC to read the direction.Can some one please give me a sample code of the sha <noauthor@nospam.com> http://www.8051projects.net/forum-t10071.html like you have done in C already, here also you need to make a look up table for encoder to detect the change in direction.or... what you can do is.. c Ajay<contact@nospam.com> http://www.8051projects.net/forum-t10071.html Ajay, i know you already told me about this...but i try to work it out on ASM code...it doesnot work..can u give me a sample code of how to decode the nicholastyc<thamyc_2000@nospam.com> http://www.8051projects.net/forum-t10071.html GPIO 4 is the channel A of the shaft encoderGPIO 5 is the channel B of the shaft encoderbelow is part of the program code for the encoder to decode th nicholastyc<thamyc_2000@nospam.com> http://www.8051projects.net/forum-t10071.html hihi, ajay,my application is for the LED dimmer, i need to know when i am turning clockwise or anti clockwise of the encoder, the light is either dimm nicholastyc<thamyc_2000@nospam.com> http://www.8051projects.net/forum-t10071.html Welcome back nich well in your program you have used so many returns.. i really have no idea where you're returning Well minute changes will make you Ajay<contact@nospam.com> http://www.8051projects.net/forum-t10071.html I was using both of your idea in my design, i make it working on hardware now...but littlt buggy is that...when u over turned the shaft encoder, the l nicholastyc<thamyc_2000@nospam.com> http://www.8051projects.net/forum-t10071.html Hi Shyam, wat is mean by wait until states are 1,1 , 0,1 or 1,0 ?is it i need to test the both bit in order to enter the loop for testing the directi nicholastyc<thamyc_2000@nospam.com> http://www.8051projects.net/forum-t10071.html hinicholastycif u had searched the forum u wud have found an earlier post on the similar topic.still lemme tell u one technique which i use..u get tw shyam<shyam@nospam.com> http://www.8051projects.net/forum-t10071.html i think something is wrong with my code that its only detects 1 direction!!i have made my program on interrupt on change to the both input port,the w nicholastyc<thamyc_2000@nospam.com> http://www.8051projects.net/forum-t10071.html CODE:
for example:

START
        btfss             GPIO,4; check encoder change nicholastyc<thamyc_2000@nospam.com> http://www.8051projects.net/forum-t10071.html Shyam , Ajay...Arun...i really need help on the encoder part...please help..i already tried my best !i still cant get the right direction ... i m usin nicholastyc<thamyc_2000@nospam.com> http://www.8051projects.net/forum-t10071.html hi nic,well u do need those A and B pin as interrupt pins.. or else u may miss the step changes..or u can try one thing.... wait until states a shyam<shyam@nospam.com> http://www.8051projects.net/forum-t10071.html is it i need to test the both bit in order to enter the loop for testing the direction?nic,take a variable say int EncCount_int.int EncStateClk_int[] shyam<shyam@nospam.com> http://www.8051projects.net/forum-t10071.html can i see your code again? Ajay<contact@nospam.com> http://www.8051projects.net/forum-t10071.html yes lets see the code again.. the interrupt one. shyam<shyam@nospam.com> http://www.8051projects.net/forum-t10071.html Hi Nic,This is a small adaptation of your polling routine using a single variable A11.It savs the current and previous AB values in this manner as a sashijoseph<sashijoseph@nospam.com> http://www.8051projects.net/forum-t10071.html Now for the nibble A11 you can have the following valid values0x01,0x07,0x08 and 0x0E representing clockwise directionand0x2,0x04,0x0B,0x0D representi sashijoseph<sashijoseph@nospam.com> http://www.8051projects.net/forum-t10071.html Hi nic, i think SJ nailed it !Arun Arun Kumar V<nura1002003@nospam.com> http://www.8051projects.net/forum-t10071.html