tank pressure sensor any electronic engineers on here ?

[GHA]

tnx Roger

signal voltage with no water in the tank = 1.60V
tank full 3.80V

this is in the dashboard:
VDO Viewline Onyx Freshwater Gauge 12/24V - Use with VDO 10-180 Ohm Sender
link
(i don't have an 10-180 Ohm sender obviously and no access to the top of tank to fit one either)

can an analougue amp be designed build for this ?

Not really been paying too much attention, so you have a new sensor which outputs 1.6v empty to 3,8v full, and another gauge which wants 2v empty and 4.5v full - 'i now have an signal of 2.0V with the tank empty and 4.5V with the tank full'
And arduino should cope with that esy enough, there's even a function for just that > Arduino Reference
You can set one of the pins as an input to measure voltage and another to output, it's not actually a voltage but turned on and off really quickly, your guage probably wouldn't notice.
Arduino PWM Tutorial

 

[rogerthebodger]

GHA where did you get the "gauge which wants 2v empty and 4.5v full" from or have I missed something.

 

[simonfraser]

Not really been paying too much attention, so you have a new sensor which outputs 1.6v empty to 3,8v full

correct
and this in the dashboard:
VDO Viewline Onyx Freshwater Gauge 12/24V - Use with VDO 10-180 Ohm Sender
link

how do i interface these ?

 

[GHA]

GHA where did you get the "gauge which wants 2v empty and 4.5v full" from or have I missed something.

By not reading very carefully
Took this to mean that the analog gauge was receiving 2v - 4.5v, don't think it does though

"i now have an signal of 2.0V with the tank empty and 4.5V with the tank full "

 

[GHA]

correct
and this in the dashboard:
VDO Viewline Onyx Freshwater Gauge 12/24V - Use with VDO 10-180 Ohm Sender
link

how do i interface these ?

Guessing the VDO will measure the resistance by sending a voltage down one wire then measuring what the voltage coming back the other is - do you have a sender to test with?

 

[greeny]

Guessing the VDO will measure the resistance by sending a voltage down one wire then measuring what the voltage coming back the other is - do you have a sender to test with?

Decade box would be useful. Not seen one for years. Or a pocketful of various resistors.

 

[simonfraser]

right, bought an Arduino, programmed it to reduce the sensor voltage to near zero and then multiplied the remainder to get an output from 0.5 to 4.5 V
works well, not going to get too worried about the exact accuracy, but as i don't have access to the top of the existing tank and a sight tube is not practical it's a good result