Input =inscription

Block Diagram A:

The first portion of the project will decode the users handwriting using Handwritten Character Recognition or HWR for short. This portion will not be designed but will use a type already used on the market. This is an expansion of the pen pad block of the overall system block diagram. The inputs are received from the pen pad and processed using signature identification software. Once the signal from the pen pad is processed into recognizable letters the information is sent to the PC.

Pen inscription

device

Signature Identification

deviceBus to PC Output =to PC

Input =bus from PC

Port Mapping of Characters

DescriptionOf motor

MovementTo Microcontroller

device

Output = to Microcontroller

Block Diagram B:

This Block diagram is for the programming used with the PC. In conjunction with this diagram, a flow chart is shown in Flow chart A. This diagram is the expanded block diagram of the PC block from the main block diagram. The enter/delete input to the port mapping block is to start character mapping /clear (restart) mapping. The mapped character are then translated to movements to be made by the motors (for each character). These movements are sent to the microcontroller.

Input=EnterOr

DeleteButton

Input =from PC

PC + Feedback= current knob

turning

ProtectionCircuitry

Output=To Motors

Block Diagram C:

This is a block diagram of what will be going on with the microcontroller. The inputs to the “PC + Feedback” block comes from the PC as signals that have gone through the handwriting recognition software. These signals are to be translated into movements to be made by the motors. The feedback controller will be located in the Microcontroller as it will change the output of the Microcontroller’s turning of the knobs of the Etch-A-Sketch®.

H-BridgeInput=Signal fromProtection circuitry

Knobs andTurn over

switch

Output = written word display

Block Diagram D:

This block diagrams input comes from the microcontroller to the output being the turning of the Etch-A-Sketch® knobs and consequently drawing a word onto the screen. The H-Bridge turns the knobs both ways for each separate knob and also for turning over the EAS.

Start

Call Data

Checker

CallCharacter

Recog

Map change

CheckSpace

connection

Load to output

End

Checks is new data is available

This is only if the device does not do this itself. This is extremely difficult and would rather not be attempted.

Check characters then change to port map of cursive.

Connect cursive letters together to form a connected word.

Load to microcontroller, either bitmap or line directions.

Definitions to flow chart blocksFlow Chart A: Shows main program flow chart with definitions.

Bradley University ECE DepartmentEE451 – Sr. Capstone Project ICNC Etch-A-Sketch ®Block Diagram 10/22/04Team Members: Robert Lodesky

Arnold BynumAdvisors: Dr. Irwin

Mr. SanchezMain Block DiagramThis main block diagram can also be seen in the Functional Description. This is an overall system block diagram for the computer network Controlled Etch-A-Sketch ® (CNC EAS). The pen pad and the keypad (block diagram A) are the two main inputs to the system to be processed (Flow Chart A) by the PC (block diagram B) and the microcontroller (block diagram C). The processed signals are sent to the motors (block diagram D) which will turn the knobs on the EAS. There is only one mode of operation, one means of placing a written word on the EAS.

Pen Pad

Key Pad

PCMicro

ControllerMotors

Etch-A-Sketch®