Micro-controller --Atmel AVR ATmega8 28-PDIP'
Crystal frequency---16.000000 MHz
HOW TO COMPILE AND UPLOAD LDMICRO PROGRAM FOR ATMEGA8
LADDER DIAGRAM:
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|| Xd0 Yd1 ||
1
||-------] [--------------( )-------||
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||------[END]-----------------------||
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I/O ASSIGNMENT:
Name |
Type | Pin
----------------------------+--------------------+------
Xd0 |
digital in | 2
Yd1 |
digital out | 3
2) Input negated digital switch
Pin B0 in Microcontroller will be high when a
digital low is given at pin B6
LADDER DIAGRAM:
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|| Xb0 Yb6 ||
1
||-------]/[--------------( )-------||
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||------[END]-----------------------||
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I/O ASSIGNMENT:
Name |
Type | Pin
----------------------------+--------------------+------
Xb0 | digital in | 27
Yb6 |
digital out | 28
3)TON TIMER
The pin RB5 will on after one second
delay after program starts
LADDER DIAGRAM:
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|| Tnew YRB5 ||
1
||--[TON 1.000 s]---------( )-------||
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||------[END]-----------------------||
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I/O ASSIGNMENT:
Name |
Type | Pin
----------------------------+--------------------+------
YRB5 |
digital out | 19
Tnew |
turn-on delay |
4)XOR Gate
LADDER DIAGRAM:
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|| XD0 XD1 YB5 ||
1
||-------] [--------------]/[------+-------( )-------||
||
| ||
|| XD0 XD1 | ||
||-------]/[--------------] [------+ ||
|| ||
||
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||
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||------[END]----------------------------------------||
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I/O ASSIGNMENT:
Name |
Type | Pin
----------------------------+--------------------+------
XD0 |
digital in | 2
XD1 | digital in | 3
YB5 |
digital out | 19
5)OR Gate
LADDER DIAGRAM:
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|| XDO YB5 ||
1
||-------] [------+-------( )-------||
|| | ||
|| XD1 | ||
||-------] [------+
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||------[END]-----------------------||
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I/O ASSIGNMENT:
Name |
Type | Pin
----------------------------+--------------------+------
XD1 | digital in | 3
XDO |
digital in | 2
YB5 |
digital out | 19
6) AND Gate
LADDER
DIAGRAM:
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|| XD0 XD1 YPB5 ||
1
||-------] [--------------] [--------------( )-------||
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||------[END]----------------------------------------||
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I/O ASSIGNMENT:
Name | Type | Pin
----------------------------+--------------------+------
XD0 |
digital in | 2
XD1 |
digital in | 3
YPB5 |
digital out | 19
7)ADC with digital
output
LADDER DIAGRAM:
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|| A5 ||
1
||--------------------{READ ADC}----||
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|| [A5 <] YD3 ||
2
||-----[ 500]-------------( )-------||
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|| [A5 >] YD4 ||
3
||-----[ 499]-------------( )-------||
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||------[END]-----------------------||
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I/O ASSIGNMENT:
Name |
Type | Pin
----------------------------+--------------------+------
YD3 |
digital out | 5
YD4 |
digital out | 6
A5 | adc
input | 28
8) UART
Send the letter “J” over uart
LADDER DIAGRAM:
|| ||
|| {A := }
||
1
||-{ 'J' MOV}--||
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|| A ||
2
||---{UART SEND}---||
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||------[END]------||
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9) Sending ADC result over UART
Here i have converted 10-bit ADC result
into 8- bit data(ASCII code) by dividing by 4 for proper UART reading
LADDER DIAGRAM:
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|| A5 ||
1
||--------------------{READ ADC}----||
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|| {DIV B
:=} ||
2
||-----------{ A5 / 4 }-----------||
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|| B ||
3
||---{UART SEND}--- ||
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|| {D :=
} ||
4
||------------------{ 13 MOV}--||
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|| D ||
5
||---{UART SEND}--- ||
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||------[END]-----------------------||
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I/O ASSIGNMENT:
Name |
Type | Pin
----------------------------+--------------------+------
A5 | adc
input | 28
B | UART
tx | 3
D | UART
tx | 3
