Water level indicator using ULN2803
i made an water level indicator using IC: ULN2803
Refer: Easiest water level indicator
It works well when used on glass of water, but when connect to my rooftop tank all the leds slowly diminishes and turns off. I think this has to do with high resistance of the tank water, but i doubt it since it worked well for first few days.
i am not any expert (clearly) so any help is appreciated.
integrated-circuit uln2003
asked yesterday
Alex Robbin
313
add a comment |Â
i made an water level indicator using IC: ULN2803
Refer: Easiest water level indicator
It works well when used on glass of water, but when connect to my rooftop tank all the leds slowly diminishes and turns off. I think this has to do with high resistance of the tank water, but i doubt it since it worked well for first few days.
i am not any expert (clearly) so any help is appreciated.
integrated-circuit uln2003
asked yesterday
Alex Robbin
313
Certainly @user156047 is right. You might use a pushbutton to power the circuit only when you want to read the level.
– Dorian
yesterday
@Dorian ok, let me try with non corrosive metal strips and get back.
– Alex Robbin
yesterday
add a comment |Â
i made an water level indicator using IC: ULN2803
Refer: Easiest water level indicator
It works well when used on glass of water, but when connect to my rooftop tank all the leds slowly diminishes and turns off. I think this has to do with high resistance of the tank water, but i doubt it since it worked well for first few days.
i am not any expert (clearly) so any help is appreciated.
integrated-circuit uln2003
asked yesterday
Alex Robbin
313
i made an water level indicator using IC: ULN2803
Refer: Easiest water level indicator
It works well when used on glass of water, but when connect to my rooftop tank all the leds slowly diminishes and turns off. I think this has to do with high resistance of the tank water, but i doubt it since it worked well for first few days.
i am not any expert (clearly) so any help is appreciated.
integrated-circuit uln2003
integrated-circuit uln2003
asked yesterday
Alex Robbin
313
asked yesterday
Alex Robbin
313
asked yesterday
Alex Robbin
313
asked yesterday
Alex Robbin
313
asked yesterday
Alex Robbin
313
313
Certainly @user156047 is right. You might use a pushbutton to power the circuit only when you want to read the level.
– Dorian
yesterday
@Dorian ok, let me try with non corrosive metal strips and get back.
– Alex Robbin
yesterday
add a comment |Â
Certainly @user156047 is right. You might use a pushbutton to power the circuit only when you want to read the level.
– Dorian
yesterday
@Dorian ok, let me try with non corrosive metal strips and get back.
– Alex Robbin
yesterday
Certainly @user156047 is right. You might use a pushbutton to power the circuit only when you want to read the level.
– Dorian
yesterday
Certainly @user156047 is right. You might use a pushbutton to power the circuit only when you want to read the level.
– Dorian
yesterday
@Dorian ok, let me try with non corrosive metal strips and get back.
– Alex Robbin
yesterday
@Dorian ok, let me try with non corrosive metal strips and get back.
– Alex Robbin
yesterday
add a comment |Â
2 Answers
2
active
oldest
votes
I'm not big in chemistry, but I believe that it has stopped working because of electrolysis. In other words your contacts have corroded to the point that the resistance is too high.
You could prevent this by using AC, but then the circuit would be a lot more complicated.
I would opt for capacitive sensors, Analog Devices have an interesting app note about
Capacitive Liquid Sensors
Or you can follow this
Instructable
answered yesterday
Elmesito
67119
I don't think AC will stop electrolysis but the corrosion must be the issue he's facing.
– Dorian
yesterday
@user156047 I too think you are right, but i dont understand anything about Capacitive liquid sensors. But, if i were to replace the contact points with something non-corrosive and have less chance for electrolysis would that work?
– Alex Robbin
yesterday
@AlexRobbin Maybe it would be better to use large electrodes. Not only the corrosion but also mud or particles attracted by the current flow might play a role in this. If you have large electrodes they will have a low impedance even covered with some impurities.
– Dorian
yesterday
For what I remember from my Uni days, there are two possible causes to corrosion, one is electrolysis and the other dissimilar metals. Electrolysis is the splitting of water cells, and that requires I believe 1.23V to happen. Unfortunately this means that for conducting the electricity you will only rely on the impurities of the water. I don't think it is a dissimilar metal issue due to the voltage you use.
– Elmesito
yesterday
1
You can easily check this by inspecting the probe wires, right?
– immibis
yesterday
 |Â
show 1 more comment
It's due to corrosion and electrolysis process mostly.
Go with some alternative thing like Float switche. Follow the link
FLOAT SWITCH
answered yesterday
Satish Singupuram
6169
add a comment |Â
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
I'm not big in chemistry, but I believe that it has stopped working because of electrolysis. In other words your contacts have corroded to the point that the resistance is too high.
You could prevent this by using AC, but then the circuit would be a lot more complicated.
I would opt for capacitive sensors, Analog Devices have an interesting app note about
Capacitive Liquid Sensors
Or you can follow this
Instructable
answered yesterday
Elmesito
67119
I don't think AC will stop electrolysis but the corrosion must be the issue he's facing.
– Dorian
yesterday
@user156047 I too think you are right, but i dont understand anything about Capacitive liquid sensors. But, if i were to replace the contact points with something non-corrosive and have less chance for electrolysis would that work?
– Alex Robbin
yesterday
@AlexRobbin Maybe it would be better to use large electrodes. Not only the corrosion but also mud or particles attracted by the current flow might play a role in this. If you have large electrodes they will have a low impedance even covered with some impurities.
– Dorian
yesterday
For what I remember from my Uni days, there are two possible causes to corrosion, one is electrolysis and the other dissimilar metals. Electrolysis is the splitting of water cells, and that requires I believe 1.23V to happen. Unfortunately this means that for conducting the electricity you will only rely on the impurities of the water. I don't think it is a dissimilar metal issue due to the voltage you use.
– Elmesito
yesterday
1
You can easily check this by inspecting the probe wires, right?
– immibis
yesterday
 |Â
show 1 more comment
I'm not big in chemistry, but I believe that it has stopped working because of electrolysis. In other words your contacts have corroded to the point that the resistance is too high.
You could prevent this by using AC, but then the circuit would be a lot more complicated.
I would opt for capacitive sensors, Analog Devices have an interesting app note about
Capacitive Liquid Sensors
Or you can follow this
Instructable
answered yesterday
Elmesito
67119
I don't think AC will stop electrolysis but the corrosion must be the issue he's facing.
– Dorian
yesterday
@user156047 I too think you are right, but i dont understand anything about Capacitive liquid sensors. But, if i were to replace the contact points with something non-corrosive and have less chance for electrolysis would that work?
– Alex Robbin
yesterday
@AlexRobbin Maybe it would be better to use large electrodes. Not only the corrosion but also mud or particles attracted by the current flow might play a role in this. If you have large electrodes they will have a low impedance even covered with some impurities.
– Dorian
yesterday
For what I remember from my Uni days, there are two possible causes to corrosion, one is electrolysis and the other dissimilar metals. Electrolysis is the splitting of water cells, and that requires I believe 1.23V to happen. Unfortunately this means that for conducting the electricity you will only rely on the impurities of the water. I don't think it is a dissimilar metal issue due to the voltage you use.
– Elmesito
yesterday
1
You can easily check this by inspecting the probe wires, right?
– immibis
yesterday
 |Â
show 1 more comment
I'm not big in chemistry, but I believe that it has stopped working because of electrolysis. In other words your contacts have corroded to the point that the resistance is too high.
You could prevent this by using AC, but then the circuit would be a lot more complicated.
I would opt for capacitive sensors, Analog Devices have an interesting app note about
Capacitive Liquid Sensors
Or you can follow this
Instructable
answered yesterday
Elmesito
67119
I'm not big in chemistry, but I believe that it has stopped working because of electrolysis. In other words your contacts have corroded to the point that the resistance is too high.
You could prevent this by using AC, but then the circuit would be a lot more complicated.
I would opt for capacitive sensors, Analog Devices have an interesting app note about
Capacitive Liquid Sensors
Or you can follow this
Instructable
answered yesterday
Elmesito
67119
answered yesterday
Elmesito
67119
answered yesterday
Elmesito
67119
answered yesterday
Elmesito
67119
67119
I don't think AC will stop electrolysis but the corrosion must be the issue he's facing.
– Dorian
yesterday
@user156047 I too think you are right, but i dont understand anything about Capacitive liquid sensors. But, if i were to replace the contact points with something non-corrosive and have less chance for electrolysis would that work?
– Alex Robbin
yesterday
@AlexRobbin Maybe it would be better to use large electrodes. Not only the corrosion but also mud or particles attracted by the current flow might play a role in this. If you have large electrodes they will have a low impedance even covered with some impurities.
– Dorian
yesterday
For what I remember from my Uni days, there are two possible causes to corrosion, one is electrolysis and the other dissimilar metals. Electrolysis is the splitting of water cells, and that requires I believe 1.23V to happen. Unfortunately this means that for conducting the electricity you will only rely on the impurities of the water. I don't think it is a dissimilar metal issue due to the voltage you use.
– Elmesito
yesterday
1
You can easily check this by inspecting the probe wires, right?
– immibis
yesterday
 |Â
show 1 more comment
I don't think AC will stop electrolysis but the corrosion must be the issue he's facing.
– Dorian
yesterday
@user156047 I too think you are right, but i dont understand anything about Capacitive liquid sensors. But, if i were to replace the contact points with something non-corrosive and have less chance for electrolysis would that work?
– Alex Robbin
yesterday
@AlexRobbin Maybe it would be better to use large electrodes. Not only the corrosion but also mud or particles attracted by the current flow might play a role in this. If you have large electrodes they will have a low impedance even covered with some impurities.
– Dorian
yesterday
For what I remember from my Uni days, there are two possible causes to corrosion, one is electrolysis and the other dissimilar metals. Electrolysis is the splitting of water cells, and that requires I believe 1.23V to happen. Unfortunately this means that for conducting the electricity you will only rely on the impurities of the water. I don't think it is a dissimilar metal issue due to the voltage you use.
– Elmesito
yesterday
1
You can easily check this by inspecting the probe wires, right?
– immibis
yesterday
I don't think AC will stop electrolysis but the corrosion must be the issue he's facing.
– Dorian
yesterday
I don't think AC will stop electrolysis but the corrosion must be the issue he's facing.
– Dorian
yesterday
@user156047 I too think you are right, but i dont understand anything about Capacitive liquid sensors. But, if i were to replace the contact points with something non-corrosive and have less chance for electrolysis would that work?
– Alex Robbin
yesterday
@user156047 I too think you are right, but i dont understand anything about Capacitive liquid sensors. But, if i were to replace the contact points with something non-corrosive and have less chance for electrolysis would that work?
– Alex Robbin
yesterday
@AlexRobbin Maybe it would be better to use large electrodes. Not only the corrosion but also mud or particles attracted by the current flow might play a role in this. If you have large electrodes they will have a low impedance even covered with some impurities.
– Dorian
yesterday
@AlexRobbin Maybe it would be better to use large electrodes. Not only the corrosion but also mud or particles attracted by the current flow might play a role in this. If you have large electrodes they will have a low impedance even covered with some impurities.
– Dorian
yesterday
For what I remember from my Uni days, there are two possible causes to corrosion, one is electrolysis and the other dissimilar metals. Electrolysis is the splitting of water cells, and that requires I believe 1.23V to happen. Unfortunately this means that for conducting the electricity you will only rely on the impurities of the water. I don't think it is a dissimilar metal issue due to the voltage you use.
– Elmesito
yesterday
For what I remember from my Uni days, there are two possible causes to corrosion, one is electrolysis and the other dissimilar metals. Electrolysis is the splitting of water cells, and that requires I believe 1.23V to happen. Unfortunately this means that for conducting the electricity you will only rely on the impurities of the water. I don't think it is a dissimilar metal issue due to the voltage you use.
– Elmesito
yesterday
1
1
You can easily check this by inspecting the probe wires, right?
– immibis
yesterday
You can easily check this by inspecting the probe wires, right?
– immibis
yesterday
 |Â
show 1 more comment
It's due to corrosion and electrolysis process mostly.
Go with some alternative thing like Float switche. Follow the link
FLOAT SWITCH
answered yesterday
Satish Singupuram
6169
add a comment |Â
It's due to corrosion and electrolysis process mostly.
Go with some alternative thing like Float switche. Follow the link
FLOAT SWITCH
answered yesterday
Satish Singupuram
6169
add a comment |Â
It's due to corrosion and electrolysis process mostly.
Go with some alternative thing like Float switche. Follow the link
FLOAT SWITCH
answered yesterday
Satish Singupuram
6169
It's due to corrosion and electrolysis process mostly.
Go with some alternative thing like Float switche. Follow the link
FLOAT SWITCH
answered yesterday
Satish Singupuram
6169
edited yesterday
answered yesterday
Satish Singupuram
6169
answered yesterday
Satish Singupuram
6169
answered yesterday
Satish Singupuram
6169
6169
add a comment |Â
add a comment |Â
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Certainly @user156047 is right. You might use a pushbutton to power the circuit only when you want to read the level.
– Dorian
yesterday
@Dorian ok, let me try with non corrosive metal strips and get back.
– Alex Robbin
yesterday