Thermostat on the microcontroller. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Thermostat on the microcontroller. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Microcontrollers

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The thermostat is assembled from available parts. During development, the main criterion was the good repeatability of the device. The thermostat was assembled on a microchip controller. The thermostat has two modes of operation. Heating mode, and cooling mode. The heating mode is activated when the set switch-on temperature is lower than the switch-off temperature. And the cooling mode is turned on when the turn-off temperature value is less than the turn-on temperature. The thermostat is able to regulate the temperature from 0 to 80 degrees with an error of 1 degree. The current temperature is displayed all the time. As a sensor, a digital sensor DS1820 is used, connected by two or three wires.

Thermostat on the microcontroller. The scheme of the thermostat on the MK PIC

Management is carried out by three keys "Installation", "More", "Less".

By holding the "Setting" key for 1 sec. the device enters the temperature programming mode, and displays the inscription "SETUP". Then, using the "More" or "Less" keys, select the programming mode for switching on or off, respectively. When "SET On" is displayed, the "More", "Less" keys set the switch-on temperature. The switch-on setting is exited by pressing the "Setting" key. When "SETOFF" is displayed, the "More", "Less" keys set the switch-off temperature.

The thermostat displays the current temperature from -30 to +80 degrees Celsius, with an accuracy of 1 degree.

Documentation (Datashit) for MK PIC16F84A

HEX firmware you can download here (2 kb).

Write: 2428104 [dog] rambler.ru

Publication: cxem.net

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