store www.buildcircuit.org kits categories Kits arduino projects smart phone projects Amarino Evaluation Shield Amarino version 3.0 basic electronic projects all posts ldr engineering all posts about BUSINESS Portfolio-Sagar Sapkota advertise forums HomeBasic ElectronicsWater Level IndicatorWater Level Indicator Basic Electronics LDR Engineering Theories5963We can use the logic of making an automatic light detector to make a simple water level indicator.We just need to remove LDR from the circuit and put the wires into water, then it simply works as water level indicator. There is a specific resistance between the wires that are dipped into water and conduction of electricity through water gives biasing voltage to base of transistor.The sensitivity can be adjusted using VR1. Put 470K variable resistance in VR1.My project:

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Sagar SapkotaI am Sagar Sapkota living in Espoo, Finland. I have completed Master's degree in Electronics and Communications with major in Electronics Productization from the University of Turku, Finland. I love to share my electronics works with the world. You can buy my kits at buildcircuit.org. - Sagar SapkotaSIMILAR ARTICLES

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Combine two dark sensors and make an easy clap switch457914 COMMENTS1. JLodgeJul 10, 2014 at 8:10 pmDoes anyone know how this water level sensor works?http://vegetronix.com/Products/AquaPlumb/I know that it is a capacitive sensor, but I dont understand why it is able to work in both polar and nonpolar liquids.Can anyone shed some light?Reply2. JLodgeJul 10, 2014 at 8:05 pmSweet circuit!If anyone is interested in creating an alternative water level sensor, check this out:http://vegetronix.com/Products/AquaPlumb/This one works capacitively rather than the traditional float based system. If it piques anyones interest, it also happens to work in many different types of liquids both polar and nonpolar. Not really sure how it works exactly, but thought it was very cool.Reply3. Just AskinApr 16, 2013 at 7:33 amHey..is there any way to add a relay to this circuit?

Reply4. caniokocDec 15, 2012 at 12:17 pmHow can I add a relay to this circuit? ThanksReply Sagar SapkotaDec 27, 2012 at 12:13 pmLearn how to use relay:http://www.buildcircuit.com/how-to-use-a-relay/Reply5. akhileshDec 12, 2012 at 1:17 pmHow to add relay to on-off water pump or just off the pump after full of tank.plz reply me in mail also if possible.Reply Sagar SapkotaDec 27, 2012 at 12:14 pmLearn how to use a relay:http://www.buildcircuit.com/how-to-use-a-relay/Reply6. GiuseppeNov 27, 2012 at 12:41 pmHi.How can I do for reversing original functionment ? i.e. I prefer that led will bright (and the buzzer sounds also)WHEN the bared copper leads are dipped togheter, at the same level, into water,revealing thus the presence of water.Thanks.Reply7. NeeyaJul 29, 2012 at 10:43 amHow can we apply some feedback in connection to this circuit?Reply8. neerajJul 2, 2012 at 12:01 pmHow can I add buzzer to itReply SagarJul 2, 2012 at 12:11 pmRemove LED and put a buzzer, simple!Reply9. gallactronicsApr 16, 2012 at 10:54 amHi! This quite an interesting circuit. But if you want to make an even simpler and effective water level indicator and alarm, you can check out this site:http://gallactronics.blogspot.in/2011/11/basic-water-level-alarm.htmlHope it was useful!Reply10. LDRENGINEERING.ORGOct 18, 2011 at 8:52 pmCheck these things:a. did you properly connect the pins of transistor? Do you know which pins are emitter, base and collector. You can see it here:http://www.fairchildsemi.com/ds/BC/BC547.pdfKeep some extra transistors, may be the transistor you are using is already broken.b. Did you connect the LED properly? Check the LED putting from both sides and check with some other LEDs also, to be sure if all the LED are working.c. Put 470KOhm or 1MOhm in place of VR1.d. Check the battery properly.e. Water should not be 100% clean :D, it works only for somewhat impure water, because there has to be some minerals to make the water conduct. If you have 100% pure water, put some salt in it.Write me again if it doesnt work.Reply11. stephenOct 18, 2011 at 7:54 pmwhy i follow this water level indicator circuit it dont not working?ReplyLeave a ReplyTop of Form

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