I'm working on a garden-bot project, and one of the problems I have, is that water pressure, from the water lines, changes considerable during the day. Since I don't want to use an additional pump, I was looking for a cheap water pressure sensor.
I found that the water sensor I can get in electronics stores (like the ones from Motorola or Freescale) are quite expensive. On the other hand, there are oil and water pressure sensor for cars that cost just a fraction (at least around here, about 1/8 of the price). Trouble is, is not easy to get a datasheet for this car sensors.
Since I'm just looking for an input of "high pressure" vs "low pressure" thought that these devices can come handy. Doing some research, I found that oil pressure sensors in cars have a digital output (just yes or no
) and have a threshold of 0.3 to 0.5 bar, which seems enough for my needs.
Does anyone have experience using this devices? I'm not proficient in auto mechanics, so I don't know what the usual pressure they measure is, or if oil sensors can work with water too?