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Gallery of Work

Expert System Designer Certificate from Motorola

I designed a digital time control clock for use in a spa pool control system using a Motorola (became Freescale, now NXP) 68HC705J1A microcontroller. This was programmed in assembly language and carried out triple redundant timekeeping in software so that, if interference disturbed one of the timekeeping processes, it could recognise the problem by comparing…

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Heater Controller side view

The mains waveform control is done using a Triac mounted on the heatsink under the PCB. The heatsink is necessary for reliable operation, and long life, while controlling a high power (2kW) heater.

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IPC CID Logo

Les Hughson is an IPC Certified Interconnect Designer (CID). This professional development program provides objective evaluation of core competencies in design, based upon industry standards rather than specifications of just one company. Courses enhance and assess technical knowledge: how to transform an electrical circuit description into a reliable PCB design that can be manufactured, assembled…

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Hand Dryer PCB

This controller capacitively senses the proximity of the users hand and controls the dryer’s fan motors and 2kW air heater accordingly, as well as multicolour LED illumination of the hand well.

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Hand Dryer PCB Reverse

The heating level (not just on/off) is controlled over time using a triac to manipulate the mains voltage waveform applied to the heater.

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Dryer LEDs – Red

A whole range of subtle lighting colour combinations are possible with RGB multicolour LEDs, not just red, green and blue.

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Dryer LEDs – Green

A whole range of subtle lighting colour combinations are possible with RGB multicolour LEDs, not just red, green and blue.

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Dryer LEDs – Blue

A whole range of subtle lighting colour combinations are possible with RGB multicolour LEDs, not just red, green and blue.

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Wireless Tag

The RF Tag can be detected over a good range, even inside, allowing the carriers presense or absense to be detected.

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