Multi-point thermometer on a microcontroller

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Multi-point thermometer 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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(click to enlarge)

Fig.1. Thermometer circuit

Multi-point thermometer on the microcontroller. Layout appearance

Rice. 2. Appearance layout

The project was born as part of the study of the MicroLan network protocol and the possibility of building autonomous networks based on it, focused on collecting data, making decisions and managing various objects.

The microcontroller AT90S2313 from Atmel, atmel.ru was used as a control, the indication was LCD from Telesystems, telesys.ru, a voltage converter from Angstrem, angstrem.ru.

The use of a voltage converter made it possible to create an autonomous device with a single 1,5 V power source. Most of the time, the device sleeps, waking up for short periods of time to find new devices on the bus, display information on the indicator, and measure the temperature.

The device is capable of servicing up to 16 DS18B20 sensors. Temperature measurement occurs approximately 1 time per minute, which imposes restrictions on the scope of the device.

The device automatically determines the number of connected sensors, takes measurements and displays the temperature, sequentially for each sensor, in ascending order of s / n.

The power consumption of the device was not measured. Estimated - 750 μW (current about 500 μA).

The device has short circuit protection.

You can download the following files related to the project:

termo_pic3.gif - printed circuit board
termo_pic4.gif - wiring diagram
termo_pic.zip - Hex-file of the program

Author: Alexey Kurguzov, kurguzov@unact.ru; Publication: cxem.net

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