Remote Position Control System of Stepper Motor

Stepper engine is found in a ton of utilizations, for example, PC peripherals, business machines, process control, machine apparatuses and loot optics. Particularly in various ranges of mechanical autonomy, process control like silicon handling, I.C. Holding and Laser trimming applications, it is important to control the stepper engine from remote places. The show paper depicts a remote precise position control arrangement of stepper engine utilizing DTMF Technology as an adjust local method for correspondence utilizing Radio Frequency (RF) with focal points of effortlessness and discern ability.

DTMF Technology has been utilized here to execute acoustic communication for controlling the precise position of the stepper engine remotely anyplace on the planet through cell telephone system. The sought estimation of precise position signals, as far as DTMF tones have been produced by utilizing a cell telephone. The microcontroller has been utilized to execute the control calculation in the wake of getting the DTMF tone. Since no additional transmitting and getting gadget is required but cell telephone, the framework is particularly straightforward, rough, and financially savvy. The trial results indicate that the framework has high determination, repeatability and mistake is likewise inside average point of confinement.

 1. Presentation
Stepper engine, due to their positional correctness’s and quick reaction, is presently finding applications in PC peripherals, process control , machine instruments, mechanical autonomy also, different observation frameworks . Particularly in mechanical technology and procedure control like silicon handling, I.C. Telephone that makes call to the next cellular telephone connected to the robot which has a RF camera that transmits a real video at the operation screen. In light of the got video, the comparing orders can be passed from the cell telephone which is associated with the transmitter side.
In the present venture the precise position of a stepper engine has been controlled remotely utilizing DTMF signal through microcontroller. Remote position control can likewise be accomplished through RF transmitter and beneficiary in any case, if there should arise an occurrence of RF specialized, gadgets utilizing similar frequencies such as remote telephones, scanners, wrist radios, individual locators and so forth can meddle with transmission. In the present plan DTMF Technology has been utilized to execute acoustic correspondence for controlling the rakish position of the stepper engine remotely anyplace on the planet through portable telephone system. DTMF decoder has been utilized to interpret the DTMF signal. The decoded signal has been perused by the microcontroller through its I/O port and creates the control sign to position the stepper engine at the fancied edge. Exploratory results demonstrate that the framework has great linearity and repeat ability. 
The mistake in estimation of rakish position is inside ± 2.7%. 2. Square Diagram and Methodology General square outline of the present project is appeared in Fig. From the piece graph it is clear that two cellular telephones have been utilized, one is with the client or administrator side and the other is in the framework or trial setup side which might be situated at any separation from the client and connected through portable system. At the point when the client makes a call to the portable telephone of the framework, it gets the call as it is dependably in auto accepting mode. Along these lines the client what's more, the framework are associated by means of versatile system. Presently if client presses any key on the key cushion, DTMF tone is produced which relates the sought rakish position of the stepper engine. This DTMF sign is gotten by the framework cell telephone situated at the getting side. There it is decoded by the DTMF decoder. The hex inverter has been utilized to the voltage level legitimately. 8051 Microcontroller gets the decoded information through the info port of 8255 and process the information as indicated by the control programming to quality rate the control signal for the stepper engine to turn at the sought rakish position. The control signal goes to the stepper engine driver ULN 2003 to drive the stepper engine. Microcontroller produces the computerized bit example of A, 6, 5, 9 for forward motion and 9, 5, 6, A for converse movement monotonously. 5- Driven markers are connected with DTMF decoder yield to demonstrate the decoded advanced piece. Out of five, one piece demonstrates the nearness or nonappearance of legitimate DTMF tone and other four LEDs show the decoded sign    al comparing to the key squeezed in the client cellular telephone. Another 4 - Driven markers have been utilized to comprehend the created bit example of microcontroller which will drive the stepper engine at the craved rakish position. 3. Grouping of Operation for Remote Angular Position Control In the present undertaking, taking after grouping of operations have been taken after for remote position control of stepper engine.
Step 1: The client makes a call to the framework cellular telephone. The framework cell telephone is set in a up to -accepting mode. Along these lines two cell telephones are associated by means of portable system and the framework cellular telephone is presently prepared to get the tone from the client versatile telephone.
Step 2: The predefined key (1 or 2) of the client cellular telephone is squeezed for selecting the mode of the pivot of stepper engine (i.e. forward or turn around). The keypad tone (DTMF signal) created because of squeezing of keys of the client cellular telephone is gotten by the framework cell telephone.
Step 3: The got tone for determination of course of movement is decoded by the created DTMF decoder circuit.
Step 4: Microcontroller peruses the decoded signal through the 8255 I/O port and store the information in it’s register which thusly chooses the computerized bit example of A, 6, 5, 9 for forward movement and 9, 5, 6, A f on the other hand reverse movement of the stepper engine.
Step 5: Now any key on the client versatile is squeezed for sought rakish position and the relating DTMF sign is decoded and after that got by the Microcontroller which executes the product program and creates the control signal for engine pivot.
Step 6: Control signal created by the microcontroller is nourished to the 8255 I/O port and afterward to the stepper engine driver for driving the stepper engine at craved precise position.
4. Point of interest Circuit Diagram and Explanation
The point of interest circuit for DTMF decoder and its interfacing with microcontroller, stepper engine and its driver circuit is appeared in Fig. 2. In the present undertaking CM8870 IC is utilized as DTMF decoder. A precious stone or earthenware resonator having a resounding frequency of 3.579545 MHZ has been associated with completes the inward clock circuit. The circuit is fueled by 5 volt supply. The DTMF signal from the client cell telephone is grabbed by the framework cellular telephone. The tip and ring of the amplifier is associated with the determined pin of CM8870 as appeared in the Fig.. C1, R1 and R2 has been balanced for addition control of the information signal. Resistance R3 also, capacitor C2 has been utilized to set the „guard time‟ which is a period length through which a legitimate DTMF tone must be p detest for its acknowledgment. The „Q - test‟ signal (pin 15) demonstrates that the substantial DTMF tone has been identified. The yield of decoder (Q0, Q1, Q2, Q3) is sent to the microcontroller through 8255 info port. The microcontroller executes the created control programming and creates the arrangement of bit example which goes to the stepper engine driver IC ULN2003A through the yield port of 8255.


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