If water supply doesn't comes in 10 minutes then it will turn off the pump and again restart it after 30 minutes to fill it.. because tanks is empty...yusuf, as you mentioned, if no water then you wait for 30min to start the pump again, i just surprised why? you can immediately start the pump when water is available. say if the pump has just stopped due to non availability of water & after 1min if water is available then why should you want your system to wait till 29 min more to start again?? whereas you can make it to work instantly...
If water supply doesn't comes in 10 minutes then it will turn off the pump and again restart it after 30 minutes to fill it.. because tanks is empty...
so there is a chance the pump will run dry for 10min? then the cycle starts after 30min to check again a 10min....ok if water comes? the pump will rum more than 10min? ie continue to run? or still stops after 10min?
no after 10 minutes if the tank is empty then it will turn off the pump and restart after 30 minutes.. as the tank is empty...
if water comes then pump will run until the tank becomes full...
and if in between water goes(or water doesn't comes) then it will turn off the pump..... and then restart after 30 minutes and it repeats...
if i understand you correctly.....what you basicaly want to do is to start the pump when there is a demand (tank empty) for 10min and stop for 30min, till the tank becomes full it will be repeated. if no water available to pump either at start or during operation then the pump stops and check the condition again to satisfy after 30min..
if you want to impliment this for domestic real application then i adwise you not go go with timer...instead you use only sensors to keep your tank level witin the limit you set by sensors....
still your explanation is not clear to me to understand your requirement, some times you can explain in better way by graphical explanation for by a flow chart if you are comfortable with it
Although it won't affect the PIC coding, you may have to consider adding an electrically-operated valve to your system if the pump is of the impeller type; otherwise water could flow through the pump under the supply pressure even if the pump is not running.
I don't understand why you want to make it using a timer????
I don't understand why you want to make it using a timer????
You only need two sensors and no controller or timer. Sensor one will detect when water is avalible. Sensor two will detect when the tank is full. Wire both in series with the motor and you are done. The pump will run if there is water avalible and the tank is not full. If water is not avalible or if the tank is full the pump will stop. You must detect if water is avalible otherwise you will burn up your pump. You cant run pumps without water.
Andy
yousuf...So by adding timer here ...... it make sense...
For the most part I would consider that a problem with the tank full sensor. Not a problem with the solution that I have proposed.Andy... what will happen when the tank level slightly comes bellow "tank full" sensor? pump will run for few seconds & stops? then again runs & stops...a series conection will not work..need to impliment a logic...
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