Micro Controller : 8K Bytes of In-System Reprogrammable Flash Memory Endurance: 1,000 Write/Erase Cycles Fully Static Operation: 0 Hz to 24 MHz Three-level Program Memory Lock 256 x 8-bit Internal RAM 32 Programmable I/O Lines Three 16-bit Timer/Counters Eight Interrupt Sources Programmable Serial Channel Low-power Idle and Power-down Modes
Stepper Motor Types :• Unipolar Stepper Motor: Unipolar stepper motors are characterised by their center-tapped windings.
Bipolar Stepper Motor: Bipolar stepper motors are designed with separate coils.
• Hybrid Stepper Motor : Variable reluctance stepper motor (also called hybrid motors) are characterised by one common lead.
Motor Driver :• Output current up to500mA• Output voltage up to 50V• Internal suppressiondiodes• Eight Darlington witheight emitters• Outputs can beparallelized
DTMF: Dual-tone multi-frequency signaling (DTMF) is used for telecommunication signallingover analog telephone lines in the voice-frequency band between telephone handsets and other communications devices and the switching center. A DTMF signal is the algebraic sum of two different audio frequencies, and can be expressed as follows: f(t) = A0sin(2*П*fa*t) + B0sin(2*П*fb*t) + ………..
• The frequencies associated with various keys on the keypad are shown in figure (A).
HT9170b :•Operating voltage:2.5V~5.5V•Minimal externalcomponents•No external filter is required•Low standby current (onpower down mode)•Excellent performance
L.C.D : Alpha Numeric L.C.D with 16 pins. 7-14 pins are data pins. L .C.D used is 2x16.
Flow Chart : start Display Characters on L.C.D If key pressed Display Corresponding Key on L.C.D rotate motor depending on key pressed Stop
Conclusion : It finds its application in X-Y Plotter used in industrial applications.