2
Fig.
1
Schematic diagram
The module must be mounted on the double-sided
PCB shown in Figure 2. Photograph showing the
details of the components arrangement under the
display and the module with the MAX6675 and
thermocouple will facilitate assembly. Begin mounting
by soldering resistors and other small components
onto the board. The next step will be to mount the
thermocouple module, which is fastened with an M2.5
screw with the nut between boards. This mounting
aligns the heights of the angled goldpins of the
module and the main board, thus allowing to sold
them together. The display will be installed as the last
component. Device mounted without any errors, with
efficient components and using a programmed
microcontroller, will work as soon as energized. You
must only adjust the display contrast with the PR1
potentiometer. Each time it is activated, the display
shows the screen as in Figure 3. The same screen and
alarm signal will appear when a sensor is disconnected
from the measuring module or becomes damaged.
During normal operation, the screen in Figure 4 will be
displayed with the measured temperature, while when
one of the buttons is pressed, the screen will switch to
the set limit temperature value which triggers an alarm
(Figure 5)
.
Fig
.
2
Arrangement of components on the PCB
LCD 1x6
ATtiny2313
7805
1N4007
uSW
uSW
5V
10k
K
100nF
100nF
100n
220uF
100uF
10k
100
GND
GND
GND
GND
GND
GND
+5V
+5V
+5V
+5V
GND
GND
GND
1
VCC
2
VO
3
RS
4
R/W
5
E
6
D0
7
D1
8
D2
9
D3
10
D4
11
D5
12
D6
13
D7
14
A
15
K
16
DISP1
(SCK)PB7
19
(MISO)PB6
18
(MOSI)PB5
17
PB4
16
(OCI)PB3
15
PB2
14
(AIN1)PB1
13
(AIN0)PB0
12
(ICP)PD6
11
(T1)PD5
9
(T0)PD4
8
(INT1)PD3
7
(INT0)PD2
6
(TXD)PD1
3
(RXD)PD0
2
GND
10
VCC
20
PA0(XTAL1)
5
PA1(XTAL2)
4
PA2(RESET)
1
US2
X1-1
X1-2
GND
IN
OUT
US1
D1
3
1
2
4
S1
3
1
2
4
S2
-
+
SG1
PR1
GND
1
VCC
2
SCK
3
CS
4
SO
5
MOD1
C1
C2
C3
C4
C5
R1
R2
SCK
SCK
MISO
MISO
MOSI
MOSI
SW1
SW1
SW2
SW2
BUZZ
BUZZ
RS
RS
E
E
D4
D4
D5
D5
D6
D6
D7
D7
LCD DISPLA
Y 6x1
+
+
Mounting and start-up
1
2
Содержание 1960
Страница 4: ...4 Notes...
