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Sight and sound applications is an extremely basic pattern these days in classroom educating. Customary blackboard framework delivers a considerable measure of chalk tidy which dirties the air and furthermore influences antagonistically on the strength of understudies and instructors. While, then again utilizing media in showing process helps in better learning and comprehension. Distinctive global firms like Panasonic, Hitachi are taking a shot at building up the innovation which can effectively supplant the conventional writing board. In this venture a consolidated answer for chalkboard and classroom checking is concentrated, This outline incorporates two modules, viz, ARM7 board processor technology for client controlled unit that can be handheld terminal with inserted linux working framework for its product. Furthermore, the other unit comprises of Raspberry-Pi ARM11 board. 

This is remote unit which is to be associated with the projector through HDMI port. At the point when a man composes on touch screen of the hand held unit utilizing a stylus, the signs are changed over into electrical flags and are transmitted remotely to the ARM11 board. Remote transmission is utilizing RF module (Zigbee). ARM11 board forms the flag and shows the composed substance utilizing projector, Also the Raspberry Pi module can be associated with WiFi arrange, so that the classroom instructing can be checked from a far off area, say, Principals office/lodge. In this manner, nature of educating can likewise be observed. Facilitate headways of the framework incorporates participation observing and video checking Thus, the entire framework is a piece of keen classroom bringing about simple and proficient instructing and learning strategies.

In India, the conventional plan of showing utilizing boards, has many hindrances, for example, educator needs to approach the writing board on the off chance that he needs to clarify his point. Conventional showing plan still uses chalk-board or slate pencil approach. In the event that it is workable for him to compose or draw on the board remotely i.e. without really moving toward the board, it will be helpful for him and additionally understudies. Through this venture we are attempting to draw an example or figure what we compose on touch cushion on transmitter favor the assistance of Touchscreen prepared compact gadget. 

The chalk, which is essentially compacted clean, can trouble a few teachers and understudies with hypersensitivities, also arrive on top of other school hardware that is tidy touchy, for example, PCs and magnifying instruments. Cost lessening and upgrading the nature of administration in the field of innovation helped instructing is advanced in this paper . It proposes the utilization of ARM and Raspberry Pi for remote transmission and gathering of manually written signs to be shown on the projector. Likewise web interface of Raspberry Pi is utilized to store records that have been sent from remote sources and view these power point documents or Portable Document Files (PDF) on the projector. The point of the proposed framework is to substitute portable PCs with Raspberry Pi which will definitely lessen the cost included. Additionally the framework will devour a littler measure of energy, yet will give an indistinguishable usefulness from some other comparative framework does System Design.

Framework OVERVIEW System incorporates two units which are handheld unit and remote unit. Handheld unit gets forms and sends written by hand flags to the remote unit by utilizing RF module (Zigbee). Handheld unit incorporates ARM7 board, Touch screen, GLCD show and Zigbee module interfaced utilizing MAX232 IC. Remote module is a Raspberry Pi ARM11 board which has HDMI port to show handled transcribed flags in bigger view by interfacing projector with it.

A.Handheld transmitter unit
At the handheld unit terminal we are utilizing ARM7 board with GLCD and touch screen. The touch detected by the touch screen is changed over into electrical flag by the processor and transmitted to the remote unit remotely by means of zigbee. Likewise at this unit, data sources are accommodated control supply.

B.Remote collector unit
At the collector side we are utilizing Raspberry-Pi ARM11 board for preparing of the signs that are sent from the handheld unit. In last article we saw that these signs are again received utilizing Zigbee beneficiary. For interfacing Zigbee module we are utilizing MAX232 IC. ARM11 sheets gives yield signals at the HDMI port which can be envisioned on the projector display. Raspberry-Pi Arm11 additionally has USB port to play or run the records put away in the outer    USB gadget, for example, pen-drive.

Touch Screen
A touch screen is an electronic show which is sense the area of a touch inside the show district. In this venture the 4 wire resistive touch screen show is utilized. The expression by and large alludes to touching the show of the gadget with a finger and stylus. Fig. demonstrates to interface the touch board with the LPC2138 processor. To distinguish the touched area, we need to peruse touch position continuously i.e. to start with read X position and after that read the Y position.

Rule of operation

The resistive touch board is developed by sandwiching two straightforward inflexible foils having resistive layer on their internal side. Normally the resistance of the thwart ought not surpass 1Kohm. Contacts made on the inverse sides of the foils by a level link. The way toward distinguishing the touched place point is apportioned into two stages. The initial step is to distinguish the X co-ordinate and the second one is to recognize the Y co-ordinate. 

For deciding the X co-ordinate, left contact on the X surface is associated with ground i.e. 0 voltage levels and the correct contact is associated with the power supply. Hence voltage divider is made when we addresses the screen. Y surface base contact peruses the estimations of divider. The divider voltage ranges from 0V to power supply voltage and it relies on the X organize.