Download Assessment Task 1

Assessment Task 3 Stepper Motor Control
The circuit shown above uses a microcontroller to control the speed, direction and angular rotation of a stepper motor. Once the circuit is
completed you will get the chance to program the controller.
Instructions
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Download the data sheets which show the pin out plans for the ztx689b transistor, the LM7805 voltage regulator and the PIC16F627
microcontroller
Gather the required components from the list below
Plan and design your circuit on PCB Express
Check your design against the circuit schematic and secure approval to proceed with the manufacturing phase from the lecturer
Manufacture the PCB, populate the circuit with the correct components and solder them safely in place
Visually check the completed circuit for physical defects
Use test equipment to check the power/ground connections and the input/output waveforms of the control pins
Check your circuit functions, by pressing the control button in the given sequence to control speed and direction
Component List:
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8 x ztx689b transistors
8 x 1N4148 diodes
4 x 1N4001 diodes
1 x 470µF Electrolytic capacitor
1 x 47µF Electrolytic capacitor
1 x 100nF Ceramic capacitor
1 x Minature PCB push to make switch(J1)
1 x LM7805 Voltage regulator
1 x 10k Resistor
8 x 1k Resistors
1 x Stepper Motor
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Assorted cables and connections
Task 1
Draw the pin-out connections for each of the given components in the boxes provided. Use a pencil and ruler to accomplish this
task.
Pin-out PIC16F627
Pin-out LM7805 Voltage Regulator
Pin-out ztx689b Transistor
Signed Lecturer ……………………………………………. Date ……………………………………………
Task 2
Print off a plan of your circuit and staple it to this page.
Signed Lecturer ……………………………………………. Date …………………………………………
Task 3
Tick off each of the components used in this circuit against the items on the following list. I have completed the first one for you
Item
Fixed Resistors
Variable Resistors
Potentiometers
Sensing Resistors (LDR etc)
Fixed Capacitors
Electrolytic Capacitors
Diodes
Zener Diodes
Light Emitting Diodes (LED)
Transistors
Thyristors
Fixing Spacers
Insulators
Cable Connectors
Protection Devices
Used in circuit 3
1 x 10k, 8 x 1k
Item
Used in circuit 3
Analogue/Digital IC’s
Surface Mount Packages
Rectifiers
Switches
Mini Transformers
Decoders
Regulators
Encoders or Resolvers
Inverters or Servo Controllers
Edge Connectors
Wiring/pins/tags/wire links
Small Heat Sinks
Cables
Opto-Electronic Components
Signed Lecturer ……………………………………………. Date ……………………………………………
Task 4
Assemble the circuit and tick off the tools used to make this circuit from the following list
Item
Heat shunts/tweezers
Snipe nosed pliers
Sleeving pliers
Bolt fasteners (spanners)
Anti-static mats or straps
Used to make circuit 3
Item
Used to make circuit 3
Component forming devices
Wire Strippers
Side or end cutters
Specialized assembly equip
Briefly describe the procedure and tools you used to make this circuit using the box below
Signed Lecturer ……………………………………………. Date ……………………………………………
Task 5
From the following list tick off which functions you think this circuit fulfils. Once again I have given you an example, the LM7805
functions as a voltage regulator.
Circuit
Audio amplifier
Signal converter
Signal generator
Counter/Timer
Oscillator
Regulated power supply
Logic function controls
Display Circuit
Which component functions
as?
LM7805
Circuit
Which component/s function
as?
Filter
Microprocessor application
Comparator
Power amplifier
Motor control
Sensor/actuator circuit
ADC/DAC hybrid circuit
Alarm/protection circuit
Use a schematic of the circuit to highlight (circle) which components function as the circuits you have ticked off on the list above.
Staple the completed schematic to this page.
Signed Lecturer ……………………………………………. Date ……………………………………………
Task 6
Tick off which items of test equipment you used to test this circuit from the following list including:
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The reason for the test
The type of test carried out
The component/s tested
The result of the test
Test Equipment Used
Multimeter
Oscilloscope
Logic Probe/Clip
Logic Analyser
Pulse Sequencing
Analyser
Counters/Timers
Signature Analyser
Reason for Test
Type of Test
Components Tested
Result
Protocol Analyser
Signal Generator
Signal Tracer
Stabilized Power Supply
Measuring Bridge
Software Diagnostic
Programs
Types of test to include: Logic states, dc voltage/current levels, ac voltage/current levels, clock timing/switching, oscillations, attenuation,
pulse width/rise time, open/short circuit, resistance, capacitance, waveform analysis, inductance, frequency modulation/demodulation,
amplification, signal noise/interference levels
Signed Lecturer ……………………………………………. Date ……………………………………………
Task 7
Use the box below to briefly evaluate this exercise, stating the things you have learned whilst building the circuit, how you
overcame any problems you encountered and what if anything you would do differently next time.
Evaluation
Signed Lecturer ……………………………………………. Date ……………………………………………
Practical Observation
Activity
Observation notes and Feedback/ Date/Time
Signed Lecturer ……………………………………………. Date ……………………………………………
Student Declaration
All of the work included as a part of this exercise is my own:
Task 1: Signed Student………………………………………. Date……………………………………………
Task 2: Signed Student………………………………………. Date……………………………………………
Task 3: Signed Student………………………………………. Date……………………………………………
Task 4: Signed Student………………………………………. Date……………………………………………
Task 5: Signed Student………………………………………. Date……………………………………………
Task 6: Signed Student………………………………………. Date……………………………………………
Task 7: Signed Student………………………………………. Date……………………………………………
All tasks complete
Signed Lecturer ……………………………………………. Date ……………………………………………