單片機(jī)外文翻譯----at89c51單片機(jī)控制的恒溫水域溫控系統(tǒng)-單片機(jī)(存儲(chǔ)版)
【正文】 . One set is the key type from the set and the AT89C51, D / A converter analog voltage measurement is the AD590, after the detection signal AT89C51, D / A converter provides analog, IC3 constitute a parison amplifier, IC4 ratio amplifier , BG1, BG2, T constitutes a thyristor conduction angle control circuit, a single bipolar transistor oscillator circuit the lower the frequency, SCR39。s onthe shorter the time the smaller the heating power, on the contrary higher. Singlejunction transistors and the oscillation frequency by the ratio of amplifier output voltage control, AT89C51 singlechip temperature settings through the sample and the temperature difference after the value, after amplification by parison with the temperature change to mediate voltage thyristor the conduction angle in order to achieve the adjustment of heating power to meet the temperature requirements of the waters of the thermostat. Drive Circuit When the 8255 high output corresponding IO port, the drive transistor turnon 9013, so that the relay action, in order to drive the work of the relevant circuit. Significant choice for a show so that the display to choose between the settings and measurement. Keyboard control and status indication circuit With the 8255 connected to the IO port 8 and 9 LED button to plete the mon waters of the control thermostat and the instructions state. In addition to each 3 button with the 8255 connected to the IO port, but also with AT89C51 it connected the timer so that when the button is depressed immediately after the interruption of AT89C51 applications, and query the status of 8255 in order to carry out the functions of the corresponding control. shows the circuit Display circuit using a half the number of table 4 show the temperature head waters of the measurement of temperature and set temperature. 2 Software design Skeleton of the software, contains initialization, configuration subroutine, subroutines to deal with temperature, showing subroutine. Completion of system initialization after poweron reset 8255 and software initialization and preheated water for the water to wait for work, and open the inlet solenoid valve, when the corresponding button press interrupted when AT89C51, read 8255 the status of the population to determine the function keys in order to call the corresponding subroutine. Subroutine pleted one set of the set temperature function. Initialization settings for the , when the choice set and to identify key addition and subtraction operations for each click on the Settings button software settings for the corresponding temperature of the addition and subtraction operation count, and the value storage and display. Subroutine to deal with the role of temperat
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