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Engineering Practice

This assignment is designed to assess your ability to use basic electronic engineering practice skills in a design and build exercise. It contributes to the following EL1205 module learning outcomes:
1 Identify, select and describe electronic components and their characteristics.
2 Use standard electronic laboratory equipment.
3 Use Electronic Computer-Aided Design (ECAD) tools.
4 Construct simple electronic circuits using appropriate prototyping techniques.
5 Undertake a small electronic design project under guidance.
2 Publication datePublication datePublication datePublication date Publication datePublication date Publication date Publication date Publication date Publication date
This brief was published in July 2014.
3 Submission arrangementsSubmission arrangementsSubmission arrangementsSubmission arrangementsSubmission arrangements Submission arrangements Submission arrangements Submission arrangementsSubmission arrangements Submission arrangements Submission arrangementsSubmission arrangementsSubmission arrangementsSubmission arrangements
Your demonstration of the circuit board will need to be made at 10am on Friday, 15 August 2014. Your report will need to be submitted to eLearn by 4pm on Friday, 15 August.
4 BackgroundBackground BackgroundBackground Background BackgroundBackground
One of the oldest communications protocol is RS232, or ??serial’. Up until recently, all PCs had a 9-pin ??D-type’ serial port for connecting serial devices like a mouse. RS232 was used on the old ??teletype’ terminals as a means of communicating with a host computer. Embedded systems use serial communications to exchange data with other embedded systems or ??host’ computers.
An RS232 frame can be composed of a group of 10 bits, clocked out by a 555 timer-based ??baud rate’ generator. The bits in this frame can be set low or high by an ??RDL’ (resistor-diode logic) OR gate. These 5V logic signals can be converted to the correct RS232 voltage levels by a ??MAX232’ chip.
A simple RS232 character generator can be made from a 555, a CMOS 4017 decade Johnson Counter (sometimes called a Ring Counter) and a set of diodes+resistor.
A specification for your particular system is given in Appendix A. You must design and construct a character generator to meet the specification. You must also simulate and measure its performance, and deliver your device and a report for assessment.
In addition to the specification at Appendix A, you should refer to the following documentation:
1. LM555 Timer data sheet. See
2. 4017 data sheet: 5 TaskTask
You need to do the following things:
1. Design a circuit to meet the attached specification.
2. Illustrate your circuit design using a schematic diagram created in ISIS.
3. Simulate your circuit design from ISIS using Proteus VSM, to confirm correct operation.
4. Create a PCB layout for your circuit using ARES, and have the PCB made for you by the electronics technicians.
5. Construct your circuit on PCB, using components available from electronics stores.
6. Test your circuit in the laboratory, making appropriate measurements on an oscilloscope and then a PC to demonstrate that the specification has been met.
7. Document your results in a report, and submit your report and your circuit as described at section 3, above.
6 Reporting ReportingReporting Reporting
Your report must have the following contents:
1. A circuit design description including references to source material and incorporating design calculations where required and a schematic diagram generated from ISIS.
2. Simulation results, generated using Proteus VSM from ISIS, confirming that the design should meet the specification.
3. A PCB layout for the circuit, generated from ARES.
4. A description of the testing undertaken to show that the circuit meets the specification, matching (within component value and measurement uncertainties) design calculations and simulation results.
Clarity of expression in written work is very important – in your studies as in professional life. Structure your report according to the specified documentation requirements. Make sure that your report is complete, but avoid unnecessary material. You must strike a balance between comprehensiveness and conciseness. Take care to check your spelling and, grammar.
The manner in which you present your submission is also very important. Your report must be word-processed and presented neatly. Ensure that the pages are securely bound, but not so securely that they can’t easily be removed for photocopying (copies of a representative sample of your reports will be retained for quality assurance purposes). Use a “Duraclip” or similar binder. Make sure that each page is marked with your name, the date of completion, the page number, and the total number of pages submitted. Make sure that the front page of your report has this information displayed prominently along with the module name and number and assignment title. Submit your report, your circuit and a completed Assignment Submission Form together in a transparent Snopake “PolyFile” or similar document wallet.

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