Home  |  Circuit diagrams  |  Electronics projects  |  Store  |  Links  |  Contact  |  Privacy policy  |  Sitemap

..::::..





Plants Watering Watcher

Plants Watering Watcher

Parts:

R1___________470K 1/4W Resistor
R2_____________3K3 1/4W Resistor
R3___________100K 1/2W Trimmer Cermet
C1_____________1nF 63V Polyester Capacitor
C2____________47΅F 25V Electrolytic Capacitor
D1__________1N4148 75V 150mA Diode
D2_____________5mm. Red LED
IC1___________4093 Quad 2 input Schmitt NAND Gate IC
P1,P2_______Probes (See text)
SW1___________SPST Slider Switch
B1______________3V Battery (2 AA 1.5V Cells in series)

Device purpose:

This circuit is intended to signal when a plant is needing water. A LED illuminates at maximum brightness when the ground in the flower-pot is too dry: it dims gradually as the water's content in the pot grows, turning off when the optimum moisture's level is reached. This condition is obtained trimming R3.

Circuit operation:

IC1D forms a square wave oscillator with approx. 10/90 mark-space ratio. It feeds the output probe P1 and its signal, inverted by IC1A is compared with that picked-up by P2 in the NAND gates IC1B & IC1C in parallel, driving the LED. When a low resistance exists between the probes, due to an high water's content in the flower-pot, the LED is off, turning gradually on as the resistance between the probes increases.

Notes:

* A square wave is used to avoid probes' oxidization.
* Probes can be long nails, carbon rods obtained from disassembled exhausted 1.5V batteries, or even a couple of screwdrivers.
* The probes must be driven in the pot's ground a few inches apart.
* Due to 3V supply, the LED needs not a limiting resistor.
* Power consumption: LED off = 50΅A; LED full on = 1mA.
* To switch-off the circuit, you can short the probes. In this case SW1 can be omitted.
* Using an high-efficiency LED, brightness variations are better emphasized. In this case a limiting resistor could be necessary.

Source: Electronics Lab

..:: Important ::..

Read disclamer, please!

 

Circuit diagrams home  |  Circuit diagrams  |  Electronics projects  |  Store  |  Links  |  Privacy policy  |  Contact


Cialis 5 mg senza ricetta Effetti collaterali del Cialis 5 mg Ordina Cialis 20mg Consegna a domicilio di Cialis originale in Svizzera Acquista Viagra in Svizzera senza prescrizione Cialis 10mg senza ricetta Dove comprare Viagra in farmacia online Sconto Cialis 5mg Dónde adquirir Reduslim Spedra Avanafil in vendita online Acquista Viagra in Svizzera senza prescrizione Dónde comprar Cialis Comprar Viagra Contrareembolso Descuento Cialis 5 mg Comprar viagra original Efectos secundarios de Cialis 5 mg Reduslim resultados Remedios para la Disfuncion Erectil Cilis vs Viagra Aviator ???? ?? ?????? Acquisto Cialis 5 mg online Cialis 5 mg effetti collaterali Comprare Cialis 20mg a buon prezzo Consegna a domicilio di Cialis originale in Svizzera Acquisto online di Viagra senza ricetta in Svizzera Cialis 10mg Acquistare Viagra in farmacia online Costo del Cialis 5mg Reduslim opiniones Comprare Spedra Avanafil senza ricetta online Dove comprare il Viagra in Svizzera Comprar Cialis barato precio Viagra genérico Descuento Cialis 5 mg Viagra sin receta Cialis 5 mg efectos secundarios severos Reduslim pérdida de peso Problemas de erección tadalafilo en venta avanafil prezzo cialis 20 mg prezzo cialis effetti benefici cialis 10 mg Reduslim Kaufen pulse x coin price avanafil prezzo buy cialis or generic tadalafil ?????? ?????? ??????????? ?????? ???????? ?????? ?????? ????????? ?????? ?????? ???????????? ?????? ?????? ? ?????? ??????????? http://diplomy-originaly.com ?????? ?????? ????? ?????? ?????? ? ??????? ??????????? ?????? ?????? ???????? ?????? ?????? ???????????? ?????? ?????? ???????????? http://diplomsagroups.com ?????? ?????? ????????? ??? ?????? ?????? ?????? ?????? ????????? ???? ?????? ?????? ? ??????? ??????????? ?????? ???????? http://sreestrom.ru/ ?????? ???????? ?? 11 ????? ?????? ?????? ?????????? ?????? ?????? ???? ?????? ?????? ? ???????? ?????? ?????? ? ?????? ??????????? https://russian-diplom.com ?????? ?????? ????????? ? ?????????? ? ?????? ?????? ?????? ???????????? http://rudiplomirovanie.com ?????? ?????? ? ??????? ?? ? ?????? ?????? ?????? ???? ?????? ?????? ???????? ?????? ?????? ? ??????? ?? ? ?????? ?????? ???????? https://premiums-diploms.com ?????? ?????? ? ???????? ?????? ?????? ????? http://russdiplomiki.com ?????? ?????? ????? ? ?????????? ? ?????? ?????? ?????? ??????????? https://diplomansy.com ?????? ?????? ? ?????????? ? ?????? ?????? ?????? ?????? ???? https://diploms-asx.com ?????? ?????? ? ?????????? ? ?????? ?????? ?????? ?????? ? ??????? ??????????? ?????? ?????? ????????? ???? ?????? ?????? ? ?????????? ? ?????? ???? ?????? ?????? ? ??????? ??????????? https://eonline-diploms.com ?????? ?????? ????????? ? ?????????? ? ?????? ?????? ????????????? ? ???????? http://free-diplommi.com ?????? ????????? ?????? ?????? ?????? ????????????? ? ???????? http://diplomrussian.com ?????? ?????? ?????????? ?????? ?????? ?????? ? ?????? ??????????? ?????? ?????? ???????????? ?????? ?????? ???? ? ?????????? ? ?????? ?????? ?????? ????????? ?????? ?????? ???????? ?????? ?????? ???? ? ?????????? ? ?????? ?????? ?????? ???????? ?????? ?????? ?????? ?????? ? ?????????? ? ?????? ???? ?????? ?????? ???????? ?????? ???????? ?????? ?????? ????????? ? ?????????? ? ?????? ?????? ????????????? ? ????? ?????? ?????? ????? ?????? ?????? ????????? ? ?????????? ? ?????? ?????? ?????? ? ?????? https://diplomsy-landsy24.ru/ ?????? ?????? ???? ? ?????????? ? ?????? ??? ?????? ?????? http://diploms-service.com ?????? ?????? ????????? ? ?????????? ? ?????? ?????? ?????? ???????????? https://kyc-diplom.com ?????? ??????????? ?????? ? ?????????? ? ?????? ?????? ?????? ???????????? ??? ?????? ?????? ?????? ?????? ? ???????? ??? ?????? ???????? https://originaly-dokuments.com ?????? ?????? ? ?????????? ? ?????? ?????? ?????? ?????? ???? https://diplomy-grup24.com/ ?????? ?????? ? ?????????? ? ?????? ????