Take a look at this design - "Automatic Watering System.":http://bookcracker.com/M278/ It is a good starting point for your design and should give you some ideas.
hi, you are talking about circuit of 'automatic' irrigation system, that's why you must use a programmable integrated circuit to control your system, for eg microcontroller, like pic16fxx, 18fxx.... (microchip)or others, you have to know the type of signal generated by the sensor, ask' the type of your sensor (analog or digital), don't forget to choose a appropriate driver to your pump (relay, triac...);
Analyze the schematic break it down into blocks Old saying if you know the output or you know what the input is you can determine the code
So lets see we have a stepper motor must be for pump What else do we have and RS 232 port connected to RC6 , RC7 which is the synchronous serial port obviously for data acquisition What else have we got Port for the adc sensors ground moister Some type of moisture indicator for the soil Not too difficult a level indictor comprising three led’s
Finally we have a learn switch my guess is that would be to do with the various levels of moisture so that you can set up what levels they want for pump activation
So lets look The algorithm must be roughly as follows
[code]
Set up ports IO
Read switches
If learn switch Call Sub Learn:
// enter the main loop
Main loop :
Read the probes Perform adc
If level below X amount turn the motor on to drive the pump for the irrigation
Pump :
Start stepper motor sequence While pump is on
Do the following Read the probes Perform adc While not level is correct
If level is correct turn off the pump Stop stepper motor sequence Else goto Pump
Loop forever
Sub Learn: // This is the learn switch
Read the probes
Wait for user to toggle switch set level one , level two , level three perform a write to internal memory on board the pic cpu
Return End sub :
[/code]
Now its should be quite easy for you to write the code yourselves
Thats the easy way to do this Do we want to make it easy Of course not Its boring
We want to make life hard, difficult , unbearable , a struggle , make people suffer We want to make this throw away , non serviceable so that we can make lots and lots of people redundant so that theys starve to death , with no hope in sight So its better than the other design tut tut tut
They came back to me with the correct information on that topic so problems solved ( Very helpfull, also said was very stange syntax but explained it perfectly )
)
