Electronics > Beginners

Coolant Level Sensor

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Pjf:
Gday,
I'm hoping you guys can give me a hand here, I'm trying to diy a coolant level sensor for my 4wd, and this is what I've got so far, just using a normal T5 dash light bulb and a buzzer, also using a WS-03 water level sensor.

Specs
Bulb
T5 12V 1.2W

Buzzer
Hyt-3015D
Voltage : 8-15V
Current : 15mA

WS-03
Working voltage: DC5~24V
Output current: 300mA
Response time: 30 seconds
Output voltage: 0.5V
Current consumption: 5mA

Any help would be greatly appreciated.

BrokenYugo:
Should be powered from the key on power, not directly off the battery.

Pjf:
Yes it will be, I've just simplified it for the purposes of this diagram.

Benta:
From what I see, it's only capable of sensing the level in the reservoir, not the cooling system. The reservoir is normally semi-transparent, so a short glance under the hood is enough.
Useless to my mind, but it's your money.
Coolant temperature is much more important for engine health monitoring.

james_s:

--- Quote from: Benta on June 25, 2022, 09:46:48 pm ---From what I see, it's only capable of sensing the level in the reservoir, not the cooling system. The reservoir is normally semi-transparent, so a short glance under the hood is enough.
Useless to my mind, but it's your money.
Coolant temperature is much more important for engine health monitoring.

--- End quote ---

Looking at the reservoir requires stopping the car, getting out, popping the hood and taking a look, how often do you think most people do that? If you have a hose failure or other serious leak that dumps your coolant you're not going to know until the car already starts to overheat, and that assumes you notice the gauge in time (like my brother didn't). Coolant temperature is indeed the critical factor, but a warning that the level in the expansion reservoir is low would be very useful to provide an early warning.

Personally I think all cars should have an obnoxious audible warning buzzer for both high coolant temperature and low oil pressure but I've never seen one that did.

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