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LCD

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PIN Assignment

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Character LCD’s

• Must write both data a d co tro! words to• LCD’s• • Comma ds"• # C!ear the dis$!a%

• # &ositio the cursor • # 'ur the cursor o or o(( • # Co tro! the st%!e o( cursor )!i e or b!oc*+

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te$$er Motors

• • Mo e i sma!! i creme ts o( rotatio• • Ca ho!d a $ositio i de(i ite!% u der !oad• • Ca rotate co ti uous!%

• • Ca mo e uic*!% to $ositio a d 4(reeze5• • re used (or • # robots• # $ri ter head $ositio i 7• # dis* dri e head $ositio i 7

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Modes o( te$$er Motor"

• 8u!! te$

• 9a!( te$

• Micro te$

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Co ce$tua! Mode! o( : i$o!ar te$$er Motor" 8u!! te$

The center taps ofthe windings arewired to the positive

supply

The two ends ofeach winding arealternately groundedto reverse thedirection of the fieldprovided by that

winding

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Full Step Mode:-

Full step sequenceshowing how binarynumbers can controlthe motor

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Co ce$tua! Mode! o( : i$o!ar te$$er Motor" 9a!( te$

Same circuitry withdifferent windingsequence

Two windings areenergized at the sameinstance

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Half Step Mode:-

Half step sequence showing how binarynumbers can control the motor