Automatic plant Irrigation (AT89C2051)

The Project presented here waters your plants regularly when you are out for vocation. The circuit comprises sensor parts built using op-amp IC LM324. Op-amp’s are configured here as a comparator. Two stiff copper wires are inserted in the soil to sense the whether the Soil is wet or dry.
The Microcontroller was used to control the whole system it monitors the sensors and when more than two sensors sense the dry condition then the microcontroller will switch on the motor and it will switch off the motor when all the sensors are in wet. The microcontroller does the above job it receives the signals from the sensors, and this signals operated under the control of software which is stored in ROM.

Circuit Diagram:

The Source code is below:
;#######################################################################################################################
; AUTOMATIC PLANT IRRIGATOR
;#######################################################################################################################

INCLUDE REG_51.PDF


SEN1 EQU P3.0 ; TO FIND WET OR DRY WET=1 DRY=0
SEN2 EQU P3.1
SEN3 EQU P3.2
SEN4 EQU P3.3

LOAD EQU P1.6 ; MOTOR

L11 EQU P1.0
LOAD1 EQU P1.4
L12 EQU P1.2

ORG 0000H

MOV R0,#00H
MOV R1,#00H



; *******************************************************************
; THE MAIN PROGRAM STARTS HERE
; *******************************************************************
MAIN:
SETB SEN1
JB SEN1,D1
JMP W1

D1: INC R0
W1: SETB SEN2
JB SEN2,D2
JMP W2

D2: INC R0
W2: SETB SEN3
JB SEN3,D3
JMP W3

D3: INC R0
W3: SETB SEN4
JB SEN4,D4
JMP W4

D4: INC R0
W4:


CJNE R0,#00H,L1 ; WET=4 DRY=0 (ALL SENSORS ARE WET)
SETB LOAD ; OFF LOAD
CLR LOAD1
CLR L11
SETB L12
MOV R1,#00H
JMP LAST

L1: CJNE R0,#01H,L2 ; WET=3 DRY=1

CJNE R1,#00H,M1
SETB LOAD ; OFF LOAD
CLR LOAD1
JMP LAST

M1: CLR LOAD ; ON LOAD
CLR L12
SETB L11
SETB LOAD1
JMP LAST

L2: CJNE R0,#02H,L3 ; WET=2 DRY=2
CLR LOAD ; ON LOAD
SETB LOAD1
CLR L12
SETB L11
MOV R1,#01H
JMP LAST


L3: CJNE R0,#03H,L4 ; WET=1 DRY=3
CLR LOAD ; ON LOAD
SETB LOAD1
CLR L12
SETB L11
MOV R1,#01H
JMP LAST


L4: CJNE R0,#04H,LAST ; WET=0 DRY=4 (ALL SENSORS ARE DRY)
CLR LOAD ; ON LOAD
SETB LOAD1
CLR L12
SETB L11
MOV R1,#01H
JMP LAST


LAST: MOV R0,#00H



JMP MAIN
; *******************************************************************



END