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Author Topic: Help, how to control ....with 89xx  (Read 1221 times)
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chithanh04dt2
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« on: March 12, 2008, 03:03:33 03:03 »

I have exercise: Control 2 step motor, 1 DC motor, 1 LCD 16x2 and 1 matrix keypad 4x4.
please help me: How to control them with one 89xx   ? can you give me schematic or ideal.

t am sorry for my English !  Cheesy
Regard
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Sorry for my English.
Regard !
supoj
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« Reply #1 on: March 14, 2008, 08:32:59 08:32 »

http://www.adisak51.com/ 

Posted on: March 14, 2008, 08:30:40 08:30 - Automerged

Or http://www.kmitl.ac.th/~kswichit/ 
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LinkSys
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« Reply #2 on: March 15, 2008, 12:22:14 00:22 »

For stepper motor,use stepper motor control ic like L297 + L298 to reduce mcu times and control code.
DC Motor use h-bridge driver circuit or ic (L298 or eqiuvalent).
LCD and key just connect directly to mcu.
Apply code using interrupt timer to devide time for control these.
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dhana
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« Reply #3 on: April 07, 2008, 08:37:28 08:37 »

It's possible. The lcd controlled by 4bit data and 2bit control (R/S , E ) .The matrix key used 8 bit port. 2 bit to control dc motor by hy-bridge type for 2 direction and stepping motor used 4bit / motor then must to used 8bit.All of bit is 24 bit = 3 port( port 0 ,1,2).
ex.Port0 is key matrix .Port2 for 2 stepping motor and Port1 is share lcd 4+2bit with 2bit dc motor.
May be split 2 bit dc motor to use Port3 bit p3.6 and p3.7.
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Ronydc
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« Reply #4 on: April 08, 2008, 08:15:22 20:15 »

this one asks this question in many forums .. where many ppl explain him but even thaugh he ask the same question since a long time . this is true and my observation. why not learning from answers since long time.?
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