The adjustable resistor is used to adjust the voltage value as the analog temperature input. When the temperature is lower than 30℃, a long buzzer alarm and an optical alarm will be given, and when the temperature is higher than 60℃, a short buzzer alarm and an optical alarm will be given. The measuring temperature range is 0-99℃.
2.？ Schematic circuit diagram
(Figure) See the diagram.
3.？ Hardware wiring on the system board?
a)？ Connect P 1.0-P 1.7 in the area of "Single Chip Microcomputer System" with the ABCDEFGH port in the area of "Dynamic Digital Display" with an 8-core flat cable. ?
b)？ Connect P2.0-P2.7 in the "Single Chip Microcomputer System" area and s 1s 2s 3s 5s 6s 7s 8 in the "Dynamic Digital Display" area with an 8-core cable. ?
c)？ Connect P3.0 in the area of "single chip microcomputer system" with the ST terminal in the area of "analog-to-digital conversion module" with wires. ?
d)？ Connect P3. 1 in the area of "single chip microcomputer system" with OE terminal in the area of "analog-to-digital conversion module" with wires. ?
e)？ Connect P3.2 in the area of "single chip microcomputer system" with EOC terminal in the area of "analog-to-digital conversion module" with wires. ?
f)？ Connect P3.3 in the area of "single chip microcomputer system" with the CLK terminal in the area of "analog-to-digital conversion module" with wires. ?
g)？ Connect the terminal A2A 1A0 in the "A/D conversion module" area to the terminal GND in the "power module" area with wires. ?
h)？ Connect the IN0 terminal in the area of "A/D conversion module" to the VR 1 terminal in the area of "Three-way adjustable voltage module" with wires. ?
Me)? Connect P0.0-P0.7 in the area of "Single Chip Microcomputer System" to terminal d0d 1 2d 3d 4d 6d 7 in the area of "Analog-to-Digital Conversion Module" with an 8-core cable. ?
j)？ Connect P3.6 and P3.7 in the area of "single chip microcomputer system" to L 1 and L2 in the area of "eight-way LED indicator module" by wires respectively. ?
k)？ Connect P3.5 in the area of "Single Chip Microcomputer System" to SPK in the area of "Audio Amplification Module" with wires. At the port. ?
l)？ Put SPK in the "Audio Amplification Module" area? Insert the audio speaker outward. ?
4.c language source program
# Contains? & ltAT89X52。 H & gt
Not signed? Charles? Code? dispbitcode[]={0xfe，0xfd，0xfb，0xf7，
0xef，0xdf，0xbf，0x7f }；
Not signed? Charles? Code? dispcode[]={0x3f，0x06，0x5b，0x4f，0x66，
0x6d、0x7d、0x07、0x7f、0x6f、0x 00 }；
Not signed? Charles? dispbuf[8]={ 10， 10， 10， 10， 10， 10，0，0 }；
Not signed? Charles? dispcount
Not signed? Charles? getdata
Not signed? int？ Temperature;
Not signed? Charles? Me;
sbit？ st=p3^0；
sbit？ oe=p3^ 1；
sbit？ eoc=p3^2；
sbit？ clk=p3^3；
sbit？ led 1=p3^6；
sbit？ led2=p3^7；
sbit？ spk=p3^5；
Bit? lowflag
Bit? highflag
Not signed? int？ cnta
Not signed? int？ cntb
Bit? alarmflag
Invalid? Major (invalid)
{
ST = 0；
OE = 0；
TMOD = 0x 12；
TH0 = 0x 2 16；
TL0 = 0x 2 16；
th 1 =(65536-500)/256；
TL 1 =(65536-500)% 256；
tr 1 = 1；
TR0 = 1；
ET0 = 1；
et 1 = 1；
EA = 1；
ST = 1；
ST = 0；
while( 1)
{
if((lowflag== 1)？ & amp& amp(highflag==0))
{
led 1 = 0；
led 2 = 1；
}
Or what? if((highflag== 1)？ & amp& amp？ (lowflag==0))
{
led 1 = 1；
led 2 = 0；
}
other
{
led 1 = 1；
led 2 = 1；
}
}
}
Invalid? t0(void)？ Interrupt? 1? Use? 0
{
CLK = ~ CLK；
}
Invalid? t 1(void)？ Interrupt? 3? Use? 0
{
th 1 =(65536-500)/256；
TL 1 =(65536-500)% 256；
if(EOC== 1)
{
OE = 1；
getdata = P0
OE = 0；
temp = getdata * 25
temp = temp/64；
I = 6；
disp buf[0]= 10；
disp buf[ 1]= 10；
disp buf[2]= 10；
disp buf[3]= 10；
disp buf[4]= 10；
disp buf[5]= 10；
disp buf[6]= 0；
disp buf[7]= 0；
while(temp/ 10)
{
disp buf[I]= temp % 10；
temp = temp/ 10；
i++；
}
disp buf[I]= temp；
if(get data & lt； 77)
{
low flag = 1；
high flag = 0；
}
Or what? if(get data & gt； 153)
{
low flag = 0；
high flag = 1；
}
other
{
low flag = 0；
high flag = 0；
}
ST = 1；
ST = 0；
}
p 1 = disp code[disp buf[disp count]]；
P2 = dispbitcode[disp count]；
disp count++；
if(dispcount==8)
{
dispcount = 0；
}
if((lowflag== 1)？ & amp& amp？ (highflag==0))
{
cnta++；
If (cnta==800)
{
cnta = 0；
alarmflag = ~ alarmflag
}
if(alarmflag== 1)
{
SPK = ~ SPK；
}
}
Or what? if((lowflag==0)？ & amp& amp？ (highflag== 1))
{
CNT b++；
If (cntb==400)
{
cntb = 0；
alarmflag = ~ alarmflag
}
if(alarmflag== 1)
{
SPK = ~ SPK；
}
}
other
{
alarm flag = 0；
cnta = 0；
cntb = 0；
}
}