I'm willing to replace the 4001 with a 555, if it can do the 20mts timing + a dry pump test too with one chip. Would it be possible by any means?
would you mind if I reply to this later after my previous query is cleared or it will make the thread totally confusing, sorry for that.What are the indications of a dry pump? If lack of input water, might a float switch keep 555; pin 4, reset, low; or a vane SW on output side. likr an air flow SW with smaller vane.
Exactly, 555 gets powered every 3 hrs or so, triggers monostable mode, starts pumping, if the sense rods detect open circuit, resets the 555 and shuts down. The time between switching on and when water starts to appear at the sense rods will have a few secs delay.. will that be a problem? And using 2 metal rods would be fine.I assume you just want to shut down the 555 timer if the water goes away. The sensor should feed a logic one into the reset pin of the 555 (pin 4). If this goes to a true 0 then the timing is aborted and the 555 resets.
Sound like what you want?
Woah.. I posted the same question 3 times and none replied and a new member helped me with it Thanks a ton, let me try it. I doubt if it will work, but will surely try as I feel so fishy abt the 1k on the transistor. Even if it doesnt works, I'm thankful for your helpchanging :
R2 from 4k7 to 27k
R1 from 1k to 100k
""solved my problem""
my relay is 12v with 400ohm resistance.
I'm so glad if this can help you solve your problem.
Please let me know.
Regards
Changed R2 to 18k and the relay wouldnt turn off at all, you were right. And pin 5 of 4001 still gives a varying output even before it reaches the 547, so that shudnt be the problem. Like you said, the only thing to suspect is the Q13 to 4001. Thank you, will try thisChanging R2 to 27k seems excessive unles BC547 were a darlington, not a bad idea. Coupling Q13 to 4001-6 bothers me as Q13 stays high for 2 hours; hence the thumb nail:
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