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Multi-level water sensor power board

I am seeking to have you design/build a water level sensing circuit with electrodes. This small device is intended to replace 4 float switches we are now using with a lower cost and higher reliability solution.

The concept is that this device will have 5 electrodes in the water tank:

High ->

Alarm ->

Timed ->

Off ->

Ground ->

High is the shortest electrode; ­Ground is the longest electrode.

“Electrodes” to be simply… a flat 5-comductor ribbon cable, with each conductor trimmed the desired lengths.


TIMED: A high-current mechanical recycle timer starts/stops the pump to pump water out when the “Timed” level is reached. When this level is reached it triggers the mechanical timer to run based on the timer’s on/off settings. Timer trigger is very flexible: AC/DC 12-240V consumption is 3 watts. Timer relay contacts handle 1/2HP pump @ 120VAC 60Hz.

OFF: At this level a circuit opens the High and Timer circuits to protect the pump from dry-running.

ALARM: At this level a circuit goes high to sound a low voltage (12VDC), low current alarm.

HIGH: At this level a circuit will start the pump by bypassing the timer contacts. This is redundancy in case the timer goes bad. This circuit needs to handle 1/2HP pump @ 120VAC 60Hz.

My price goal for the described device is to be <USD40 in small quantity…

Attached are sample circuits that can be used for concept purposes.

Kĩ năng: Kĩ thuật điện, Điện tử, PCB Layout

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Về Bên Thuê:
( 10 nhận xét ) Fair Oaks, United States

ID dự án: #1643588

Được trao cho:


I can do it! I sent PM to you.

$50 USD trong 3 ngày
(4 Đánh Giá)

9 freelancer đang chào giá trung bình $209 cho công việc này


Hello! I've Ph.D. in Electronic Engineereing. I work with Analog Electronics and PCB design. I can do what you need with quality and reliability!

$250 USD trong 5 ngày
(52 Nhận xét)

hi, i can help.

$400 USD trong 20 ngày
(44 Nhận xét)

Hello 'Carpe01', I am submitting my detailed bid in the PM. Kindly review the same. Thank you very much. JJdatajobs.

$30 USD trong 3 ngày
(7 Nhận xét)

I'm an electronic engineer and I have experience of doing such projects.

$100 USD trong 15 ngày
(4 Nhận xét)

I design device with the gamma pic12,pic16 y pic18 of microchip.

$50 USD trong 5 ngày
(1 Nhận xét)

Please see private message.

$250 USD trong 14 ngày
(1 Nhận xét)

Hello, I can design the schematics and write the code for microcontroller. Check my PM. Regards

$500 USD trong 30 ngày
(0 Nhận xét)

Please check your MB.

$250 USD trong 10 ngày
(0 Nhận xét)