Jump to content
Electronics-Lab.com Community


  • Posts

  • Joined

  • Last visited


Posts posted by sattyshack

  1. another question the circuit seems to latch in the high state and when i abruptsl contact the probes together it goes back to the low state. My high state shorted probes is 4.65v and my low state high-z on the probes is 2.12v does this seem reasonable. I also had another question in my case i am only looking for 3 threshhold DC voltages to trigger watering, so my microcontroller will be looking for only 3 set dc voltages. Would it be easier to use the soils resistance to adjust the gain on an op amp producing a range of values based on my op amps gain. Almost like a thermister would be used for temperature. Im not doing data logging so i only need minimal accuracy say dry, medium dry, and wet. But if the output from your design is supposed to be from 2.11  - 4.65V and i van get rid of that latching effect then i can make that work.

  2. With your second circuit that has the blinking led, how would you modify it so you can have a lininer output with moisture vs voltage. would it be simmilar to the configuration of circuit one where the output does not blink. my objective is to try and connect this to the analog port on my microcontroller. Any help would be greatly appriciated

  • Create New...