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====== '''The Central Unit Construction''' ====== This is a part which is not clearly designed and any help is highly appreciated! '''Dimensions and materials''' * External Protective Layer dimensions - cuboid: a= 400 mm; b = 400 mm; c = 300 mm; layer thickness = 7-13 mm material - [http://en.wikipedia.org/wiki/Medium-density_fibreboard MDF board] cost - $15-20 * Internal layer There is probably no need to have additional internal insulation layer because of the ventilation system requirements. Or should be the internal cooling and heating unit with the fan system insulated??? If so how and how much??? * Electronic components microcontroller: [http://www.google.com/url?q=http%3A%2F%2Fwww.atmel.com%2FImages%2F7593S.pdf&sa=D&sntz=1&usg=AFQjCNEXejfPb9-DEaMdejkK_IJwiVU7Bg ATMEL 90USB1286-AU]; power requirements - ??? W; cost = donated; otherwise = ??? display: [http://en.wikipedia.org/wiki/Liquid_crystal_display LCD display]; power requirements - ??? W; cost = $10-15 manual control - numeric keyboard ???; power requirements - ???; cost = $??? temperature sensor: thermistor - type ???; power requirements; cost - $1-2 combined heating and cooling unit: [http://www.ebay.com/itm/12V-60W-TEC1-12706-Thermoelectric-Cooler-Peltier-Module-/230665309463?pt=LH_DefaultDomain_0&hash=item35b4b94d17 peltier module (12 V 60 W)]; power requirements - 60 W; cost = $10-20 heatsink: aluminum alloy or copper based; dimensions - cooling smaller (3x4cm), heating bigger (7x10cm), details ???; cost = $10-15 (hot) and $5-10 (cold) fans: 2 x 60 mm; power requirements - up to 2-4 W; cost = $2-3 (price and power consumption per each fan) power source: 120-150 W; cost = $10-15 another electronic components:breadboard; relays; resistors; diodes etc. cost = $15-30
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