using pressure sensor with 0-10v output for 0-10bar using arduino but pressure value won't cross 4bar. so is...
$begingroup$
I have a pressure sensor working at 24V dc whose output is analog 0-10V for 0-10bar pressure. I am using this sensor with Arduino Uno. I know that the pressure value will never go beyond 4bar. So do I have to use a voltage divider in this case or not using it will still do the job?
arduino sensor voltage-divider
asked Mar 31 at 3:23
shivamshivam
61
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add a comment |
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I have a pressure sensor working at 24V dc whose output is analog 0-10V for 0-10bar pressure. I am using this sensor with Arduino Uno. I know that the pressure value will never go beyond 4bar. So do I have to use a voltage divider in this case or not using it will still do the job?
arduino sensor voltage-divider
asked Mar 31 at 3:23
shivamshivam
61
New contributor
shivam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
"I know that the pressure value will never go beyond 4bar." - How are you so sure? I recommend designing for the full sensor range anyway; that way you can actually measure overpressure if it ever happens, even if that's not expected under normal circumstances.
$endgroup$
– marcelm
2 days ago
add a comment |
$begingroup$
I have a pressure sensor working at 24V dc whose output is analog 0-10V for 0-10bar pressure. I am using this sensor with Arduino Uno. I know that the pressure value will never go beyond 4bar. So do I have to use a voltage divider in this case or not using it will still do the job?
arduino sensor voltage-divider
asked Mar 31 at 3:23
shivamshivam
61
New contributor
shivam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I have a pressure sensor working at 24V dc whose output is analog 0-10V for 0-10bar pressure. I am using this sensor with Arduino Uno. I know that the pressure value will never go beyond 4bar. So do I have to use a voltage divider in this case or not using it will still do the job?
arduino sensor voltage-divider
arduino sensor voltage-divider
asked Mar 31 at 3:23
shivamshivam
61
New contributor
shivam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Mar 31 at 3:23
shivamshivam
61
New contributor
shivam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Mar 31 at 3:23
shivamshivam
61
New contributor
shivam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Mar 31 at 3:23
shivamshivam
61
asked Mar 31 at 3:23
shivamshivam
61
61
New contributor
shivam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
shivam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
shivam is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$begingroup$
"I know that the pressure value will never go beyond 4bar." - How are you so sure? I recommend designing for the full sensor range anyway; that way you can actually measure overpressure if it ever happens, even if that's not expected under normal circumstances.
$endgroup$
– marcelm
2 days ago
add a comment |
$begingroup$
"I know that the pressure value will never go beyond 4bar." - How are you so sure? I recommend designing for the full sensor range anyway; that way you can actually measure overpressure if it ever happens, even if that's not expected under normal circumstances.
$endgroup$
– marcelm
2 days ago
$begingroup$
"I know that the pressure value will never go beyond 4bar." - How are you so sure? I recommend designing for the full sensor range anyway; that way you can actually measure overpressure if it ever happens, even if that's not expected under normal circumstances.
$endgroup$
– marcelm
2 days ago
$begingroup$
"I know that the pressure value will never go beyond 4bar." - How are you so sure? I recommend designing for the full sensor range anyway; that way you can actually measure overpressure if it ever happens, even if that's not expected under normal circumstances.
$endgroup$
– marcelm
2 days ago
add a comment |
2 Answers
2
active
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$begingroup$
If we assume your Arduino Uno is powered from 5v, then what you appear to be asking is 'if my sensor voltage always stays within the range 0 to 4v, will it be OK to put it into and ADC that can accept 0 to 5v input?'
Under normal conditions, the answer is obviously yes.
The experienced designer designs things so that they work under 'normal' conditions, and don't break under possible but 'abnormal' conditions. Will your sensor output ever go above 5v? What about a brief blip when it's first switched on? What about water hammer in the pipes you're measuring?
It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail, and use at least a series resistor between sensor and Uno to limit the current to less than this under fault conditions.
answered 2 days ago
Neil_UKNeil_UK
78.5k284181
$endgroup$
$begingroup$
"It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail..." - That's going to be very little; any overvoltage will be shunted by the ESD protection diodes to VCC, and those diodes are not very beefy. Abuse may render them shorted (as they are on one of the ATMEGA328Ps I have here), killing that pin and possibly the MCU. I recommend external clamping for good protection. I've never found an official figure for the current capabilities of those diodes, but an Atmel app note suggested staying below 1mA.
$endgroup$
– marcelm
2 days ago
$begingroup$
@marcelm thanks for checking. Looks like 1mA it is then. 20kohms should be enough to limit the maximu current to 1mA if we assume the input could blip to +24v.
$endgroup$
– Neil_UK
2 days ago
$begingroup$
The app note in question is Atmel AN2508 by the way. It should be noted that (unlike datasheets), app notes should be considered more of a suggestion, not an authority. But hey, it gives us a ballpark figure to work with.
$endgroup$
– marcelm
yesterday
add a comment |
$begingroup$
You might not need a voltage divider considering the range in normal operation, but I recommend a series current limiting resistor to protect the sensor, a clamp diode to Vcc, possibly another series resistor after the clamp diode to protect the ADC, and possibly a smoothing capacitor on the ADC input pin.
answered 2 days ago
alex.forencichalex.forencich
33.1k14989
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add a comment |
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2 Answers
2
active
oldest
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2 Answers
2
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$begingroup$
If we assume your Arduino Uno is powered from 5v, then what you appear to be asking is 'if my sensor voltage always stays within the range 0 to 4v, will it be OK to put it into and ADC that can accept 0 to 5v input?'
Under normal conditions, the answer is obviously yes.
The experienced designer designs things so that they work under 'normal' conditions, and don't break under possible but 'abnormal' conditions. Will your sensor output ever go above 5v? What about a brief blip when it's first switched on? What about water hammer in the pipes you're measuring?
It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail, and use at least a series resistor between sensor and Uno to limit the current to less than this under fault conditions.
answered 2 days ago
Neil_UKNeil_UK
78.5k284181
$endgroup$
$begingroup$
"It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail..." - That's going to be very little; any overvoltage will be shunted by the ESD protection diodes to VCC, and those diodes are not very beefy. Abuse may render them shorted (as they are on one of the ATMEGA328Ps I have here), killing that pin and possibly the MCU. I recommend external clamping for good protection. I've never found an official figure for the current capabilities of those diodes, but an Atmel app note suggested staying below 1mA.
$endgroup$
– marcelm
2 days ago
$begingroup$
@marcelm thanks for checking. Looks like 1mA it is then. 20kohms should be enough to limit the maximu current to 1mA if we assume the input could blip to +24v.
$endgroup$
– Neil_UK
2 days ago
$begingroup$
The app note in question is Atmel AN2508 by the way. It should be noted that (unlike datasheets), app notes should be considered more of a suggestion, not an authority. But hey, it gives us a ballpark figure to work with.
$endgroup$
– marcelm
yesterday
add a comment |
$begingroup$
If we assume your Arduino Uno is powered from 5v, then what you appear to be asking is 'if my sensor voltage always stays within the range 0 to 4v, will it be OK to put it into and ADC that can accept 0 to 5v input?'
Under normal conditions, the answer is obviously yes.
The experienced designer designs things so that they work under 'normal' conditions, and don't break under possible but 'abnormal' conditions. Will your sensor output ever go above 5v? What about a brief blip when it's first switched on? What about water hammer in the pipes you're measuring?
It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail, and use at least a series resistor between sensor and Uno to limit the current to less than this under fault conditions.
answered 2 days ago
Neil_UKNeil_UK
78.5k284181
$endgroup$
$begingroup$
"It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail..." - That's going to be very little; any overvoltage will be shunted by the ESD protection diodes to VCC, and those diodes are not very beefy. Abuse may render them shorted (as they are on one of the ATMEGA328Ps I have here), killing that pin and possibly the MCU. I recommend external clamping for good protection. I've never found an official figure for the current capabilities of those diodes, but an Atmel app note suggested staying below 1mA.
$endgroup$
– marcelm
2 days ago
$begingroup$
@marcelm thanks for checking. Looks like 1mA it is then. 20kohms should be enough to limit the maximu current to 1mA if we assume the input could blip to +24v.
$endgroup$
– Neil_UK
2 days ago
$begingroup$
The app note in question is Atmel AN2508 by the way. It should be noted that (unlike datasheets), app notes should be considered more of a suggestion, not an authority. But hey, it gives us a ballpark figure to work with.
$endgroup$
– marcelm
yesterday
add a comment |
$begingroup$
If we assume your Arduino Uno is powered from 5v, then what you appear to be asking is 'if my sensor voltage always stays within the range 0 to 4v, will it be OK to put it into and ADC that can accept 0 to 5v input?'
Under normal conditions, the answer is obviously yes.
The experienced designer designs things so that they work under 'normal' conditions, and don't break under possible but 'abnormal' conditions. Will your sensor output ever go above 5v? What about a brief blip when it's first switched on? What about water hammer in the pipes you're measuring?
It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail, and use at least a series resistor between sensor and Uno to limit the current to less than this under fault conditions.
answered 2 days ago
Neil_UKNeil_UK
78.5k284181
$endgroup$
If we assume your Arduino Uno is powered from 5v, then what you appear to be asking is 'if my sensor voltage always stays within the range 0 to 4v, will it be OK to put it into and ADC that can accept 0 to 5v input?'
Under normal conditions, the answer is obviously yes.
The experienced designer designs things so that they work under 'normal' conditions, and don't break under possible but 'abnormal' conditions. Will your sensor output ever go above 5v? What about a brief blip when it's first switched on? What about water hammer in the pipes you're measuring?
It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail, and use at least a series resistor between sensor and Uno to limit the current to less than this under fault conditions.
answered 2 days ago
Neil_UKNeil_UK
78.5k284181
answered 2 days ago
Neil_UKNeil_UK
78.5k284181
answered 2 days ago
Neil_UKNeil_UK
78.5k284181
answered 2 days ago
Neil_UKNeil_UK
78.5k284181
78.5k284181
$begingroup$
"It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail..." - That's going to be very little; any overvoltage will be shunted by the ESD protection diodes to VCC, and those diodes are not very beefy. Abuse may render them shorted (as they are on one of the ATMEGA328Ps I have here), killing that pin and possibly the MCU. I recommend external clamping for good protection. I've never found an official figure for the current capabilities of those diodes, but an Atmel app note suggested staying below 1mA.
$endgroup$
– marcelm
2 days ago
$begingroup$
@marcelm thanks for checking. Looks like 1mA it is then. 20kohms should be enough to limit the maximu current to 1mA if we assume the input could blip to +24v.
$endgroup$
– Neil_UK
2 days ago
$begingroup$
The app note in question is Atmel AN2508 by the way. It should be noted that (unlike datasheets), app notes should be considered more of a suggestion, not an authority. But hey, it gives us a ballpark figure to work with.
$endgroup$
– marcelm
yesterday
add a comment |
$begingroup$
"It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail..." - That's going to be very little; any overvoltage will be shunted by the ESD protection diodes to VCC, and those diodes are not very beefy. Abuse may render them shorted (as they are on one of the ATMEGA328Ps I have here), killing that pin and possibly the MCU. I recommend external clamping for good protection. I've never found an official figure for the current capabilities of those diodes, but an Atmel app note suggested staying below 1mA.
$endgroup$
– marcelm
2 days ago
$begingroup$
@marcelm thanks for checking. Looks like 1mA it is then. 20kohms should be enough to limit the maximu current to 1mA if we assume the input could blip to +24v.
$endgroup$
– Neil_UK
2 days ago
$begingroup$
The app note in question is Atmel AN2508 by the way. It should be noted that (unlike datasheets), app notes should be considered more of a suggestion, not an authority. But hey, it gives us a ballpark figure to work with.
$endgroup$
– marcelm
yesterday
$begingroup$
"It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail..." - That's going to be very little; any overvoltage will be shunted by the ESD protection diodes to VCC, and those diodes are not very beefy. Abuse may render them shorted (as they are on one of the ATMEGA328Ps I have here), killing that pin and possibly the MCU. I recommend external clamping for good protection. I've never found an official figure for the current capabilities of those diodes, but an Atmel app note suggested staying below 1mA.
$endgroup$
– marcelm
2 days ago
$begingroup$
"It would be prudent to check how much current the Uno input can accept without damage when the voltage exceeds the rail..." - That's going to be very little; any overvoltage will be shunted by the ESD protection diodes to VCC, and those diodes are not very beefy. Abuse may render them shorted (as they are on one of the ATMEGA328Ps I have here), killing that pin and possibly the MCU. I recommend external clamping for good protection. I've never found an official figure for the current capabilities of those diodes, but an Atmel app note suggested staying below 1mA.
$endgroup$
– marcelm
2 days ago
$begingroup$
@marcelm thanks for checking. Looks like 1mA it is then. 20kohms should be enough to limit the maximu current to 1mA if we assume the input could blip to +24v.
$endgroup$
– Neil_UK
2 days ago
$begingroup$
@marcelm thanks for checking. Looks like 1mA it is then. 20kohms should be enough to limit the maximu current to 1mA if we assume the input could blip to +24v.
$endgroup$
– Neil_UK
2 days ago
$begingroup$
The app note in question is Atmel AN2508 by the way. It should be noted that (unlike datasheets), app notes should be considered more of a suggestion, not an authority. But hey, it gives us a ballpark figure to work with.
$endgroup$
– marcelm
yesterday
$begingroup$
The app note in question is Atmel AN2508 by the way. It should be noted that (unlike datasheets), app notes should be considered more of a suggestion, not an authority. But hey, it gives us a ballpark figure to work with.
$endgroup$
– marcelm
yesterday
add a comment |
$begingroup$
You might not need a voltage divider considering the range in normal operation, but I recommend a series current limiting resistor to protect the sensor, a clamp diode to Vcc, possibly another series resistor after the clamp diode to protect the ADC, and possibly a smoothing capacitor on the ADC input pin.
answered 2 days ago
alex.forencichalex.forencich
33.1k14989
$endgroup$
add a comment |
$begingroup$
You might not need a voltage divider considering the range in normal operation, but I recommend a series current limiting resistor to protect the sensor, a clamp diode to Vcc, possibly another series resistor after the clamp diode to protect the ADC, and possibly a smoothing capacitor on the ADC input pin.
answered 2 days ago
alex.forencichalex.forencich
33.1k14989
$endgroup$
add a comment |
$begingroup$
You might not need a voltage divider considering the range in normal operation, but I recommend a series current limiting resistor to protect the sensor, a clamp diode to Vcc, possibly another series resistor after the clamp diode to protect the ADC, and possibly a smoothing capacitor on the ADC input pin.
answered 2 days ago
alex.forencichalex.forencich
33.1k14989
$endgroup$
You might not need a voltage divider considering the range in normal operation, but I recommend a series current limiting resistor to protect the sensor, a clamp diode to Vcc, possibly another series resistor after the clamp diode to protect the ADC, and possibly a smoothing capacitor on the ADC input pin.
answered 2 days ago
alex.forencichalex.forencich
33.1k14989
answered 2 days ago
alex.forencichalex.forencich
33.1k14989
answered 2 days ago
alex.forencichalex.forencich
33.1k14989
answered 2 days ago
alex.forencichalex.forencich
33.1k14989
33.1k14989
add a comment |
add a comment |
shivam is a new contributor. Be nice, and check out our Code of Conduct.
shivam is a new contributor. Be nice, and check out our Code of Conduct.
shivam is a new contributor. Be nice, and check out our Code of Conduct.
shivam is a new contributor. Be nice, and check out our Code of Conduct.
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$begingroup$
"I know that the pressure value will never go beyond 4bar." - How are you so sure? I recommend designing for the full sensor range anyway; that way you can actually measure overpressure if it ever happens, even if that's not expected under normal circumstances.
$endgroup$
– marcelm
2 days ago