Design of Data Acquisition Based on Single Chip Microcomputer-EEWORLD

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1. Design requirements

　　Use the 0809 on the experimental instrument to do the A/D conversion experiment. The W1 potentiometer on the experimental instrument provides analog input. Write a program to convert the analog quantity into digital quantity and display it through the light-emitting diodes L1-L8.

　　2. Design Description

　　A/D converters are roughly divided into three categories: the first is the dual-integral A/D converter, which has the advantages of high precision, good anti-interference, low price, but slow speed; the second is the successive approximation A/D converter, which has moderate precision, speed and price; the third is the parallel A/D converter, which is fast and expensive. The ADC0809 used in the experiment belongs to the second category and is an 8-bit A/D converter. Each acquisition generally takes 100μs. Since the ADC0809 A/D converter automatically generates an EOC signal (high level is valid) after the conversion is completed, it is connected to the INT0 of the 8031 after being inverted, and the A/D conversion result can be read in interrupt mode.

　　3. Data acquisition schematic diagram

Schematic diagram of data acquisition based on single chip microcomputer

　　4. Design steps

　　① Connect the IN0 pin of channel 0 of A/D block 0809 to the center tap V01 jack (0-5V) of W1.

　　② Connect the CS terminal of A/D area 0809 to the decoding output terminal Y1 jack.

　　③The CLK jack of 0809 is connected to the frequency division output terminal T4.

　　④ Connect the input VIN of W2 to the +12V jack, and then connect the +12V jack to the +12 of the external power supply (this line is already connected when the power supply is built-in). Adjust W2 so that the V- (REF) terminal is +5V.

　　⑤ Connect the VREF of the A/D area to the output VREF end of W2.

　　⑥Insert a 74LS02 chip into EXIC1, insert a 74LS32 chip into EXIC2, and connect the relevant circuits according to the diagram.

　　⑦ Connect A/D area D0-D7 to BUS1 area XD0-XD7 with a flat cable.

　　⑧The simulation experiment system is in the "P....." state.

　　⑨ Run the program continuously from the starting address 06D0, and display the digital quantity converted from the currently collected voltage value on the light-emitting diodes L7-L0. Adjust W1, and L7-L0 will change accordingly with the voltage change. L7-L0 corresponds to the digital quantity D7-D0.

　　5. Procedure

　　Program Listing:

　　ORG 06D0H

　　START: MOV A,#00H

　　MOV DPTR,#9000H

　　MOVX @DPTR,A

　　MOV R7,#0FFH

　　H55S: DJNZ R7,H55S

　　MOVX A,@DPTR

　　MOV DPTR,#0A000H

　　MOVX @DPTR,A

　　SJMP START

　　END

References:

[1]. ADC0809 datasheet http://www.dzsc.com/datasheet/ADC0809_123186.html.
[2]. 74LS02 datasheet http://www.dzsc.com/datasheet/74LS02_961364.html.
[3]. 74LS32 datasheet http://www.dzsc.com/datasheet/74LS32_1054903.html.

Keywords：MCU Reference address：Design of Data Acquisition Based on Single Chip Microcomputer

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