Thermometer on the microcontroller DS18B20. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Thermometer on the microcontroller DS18B20. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Microcontrollers

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I dare to suggest for repetition a simple thermometer on the sensor DS18B20 (DS18S20) and PIC16F630.

It was made for use in the climate supply system at another MK, and this scheme was a by-product of development. A special feature is the high speed of measurements (the sampling period is about 110 ms). Typical range: -55...+125, resolution 1 degree, accuracy corresponds to sensor accuracy - 0,5 degrees (in the range -10...+85).

Any power supply from 4 to 5 volts (but stabilized). An indicator with a common cathode (but you can also make a common anode). Resistors in segments can be changed in the range of 82...150 Ohm. Keys on MOSFETs are easy to replace with NPN transistors (there are ordinary KT315 with basic dividers in the layout).

At the request of workers, it is possible to increase the number of sensors, but not more than 3 (otherwise, 14 MK outputs will not be enough). It is also possible to port the solution to any Microchip MC with at least 14 outputs.

(click to enlarge)

Thermometer on the microcontroller DS18B20. Assembled circuit on breadboard

You can download the HEX firmware, the source codes for ASM and C programs here

Author: Mark Yampolsky(my504); Publication: cxem.net

See other articles Section Microcontrollers.

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