pcb layout design. pcb layout special layout considerations 4 in
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COST ROBOTANDY LOVELESS
PCB Layout Design
PCB Layout
Special Layout Considerations
Small and densely populated areaLongest diagonal: 4 inArea: 11.31
ATD isolation to avoid noise3 short range sensors1 IR long range sensor1 RGB color sensor
Isolation of compass from magnetic field generated by motors
General guidelinesApproximately 16 mils traceMostly surface mount components
4 in
Microcontroller Layout Considerations Headers
Programming headerDebugging USART header
Routing considerationsMicro must connect radially to all componentsLimit the use of vias
External oscillatorPrecaution; internal 8 MHz oscillator seems
sufficient
Power Supply Layout Considerations Multiple voltages
7.4 V battery for motor5.0 V regulated for micro and other
components Power lines
Direct routing of power to each subsystemDifficult due to board size/shape
Passive componentsDecoupling and bulk capacitors
Things to Do
Add headers for unused port pins Connect headers:
Analog sensor headerProgramming headerI2C header for compass
Increase thickness of power traces Add idiot-proof connectors Reverse voltage protection diode