Get reading of RPI supply voltage
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On the most recent pi I've been playing with I've noticed the under-voltage lightning bolt warning, discussed on this question.
My question is whether there's a way I can access the voltage reading used to trigger this warning, so that I can see how under-voltage it is, and whether removing peripherals / using a bigger supply fixes is.
There are related questions such as this one one what might be causing voltage drift of the 5V rail, and this one one what the power requirements of the pi are, and finally this one for how to measure the voltage and current from a battery, but I couldn't find an explanation of how to access the pi's onboard supply voltage measurement (assuming there is one).
voltage
asked Dec 2 at 18:55
kabdulla
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On the most recent pi I've been playing with I've noticed the under-voltage lightning bolt warning, discussed on this question.
My question is whether there's a way I can access the voltage reading used to trigger this warning, so that I can see how under-voltage it is, and whether removing peripherals / using a bigger supply fixes is.
There are related questions such as this one one what might be causing voltage drift of the 5V rail, and this one one what the power requirements of the pi are, and finally this one for how to measure the voltage and current from a battery, but I couldn't find an explanation of how to access the pi's onboard supply voltage measurement (assuming there is one).
voltage
asked Dec 2 at 18:55
kabdulla
1084
New contributor
kabdulla is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |
up vote
1
down vote
favorite
up vote
1
down vote
favorite
On the most recent pi I've been playing with I've noticed the under-voltage lightning bolt warning, discussed on this question.
My question is whether there's a way I can access the voltage reading used to trigger this warning, so that I can see how under-voltage it is, and whether removing peripherals / using a bigger supply fixes is.
There are related questions such as this one one what might be causing voltage drift of the 5V rail, and this one one what the power requirements of the pi are, and finally this one for how to measure the voltage and current from a battery, but I couldn't find an explanation of how to access the pi's onboard supply voltage measurement (assuming there is one).
voltage
asked Dec 2 at 18:55
kabdulla
1084
New contributor
kabdulla is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
On the most recent pi I've been playing with I've noticed the under-voltage lightning bolt warning, discussed on this question.
My question is whether there's a way I can access the voltage reading used to trigger this warning, so that I can see how under-voltage it is, and whether removing peripherals / using a bigger supply fixes is.
There are related questions such as this one one what might be causing voltage drift of the 5V rail, and this one one what the power requirements of the pi are, and finally this one for how to measure the voltage and current from a battery, but I couldn't find an explanation of how to access the pi's onboard supply voltage measurement (assuming there is one).
voltage
voltage
asked Dec 2 at 18:55
kabdulla
1084
New contributor
kabdulla is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Dec 2 at 18:55
kabdulla
1084
New contributor
kabdulla is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Dec 2 at 18:55
kabdulla
1084
New contributor
kabdulla is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Dec 2 at 18:55
kabdulla
1084
asked Dec 2 at 18:55
kabdulla
1084
1084
New contributor
kabdulla is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
kabdulla is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
kabdulla is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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2 Answers
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I do not think there is any Pi circuitry to return the current supply voltage.
As far as I am aware the under voltage circuitry is a piece of hardware which triggers at 4.65V. So you could discriminate between two values, more than 4.65V or less than 4.65V.
The only justification for this answer is I remember dozens of posts where people have asked the same question and I do not remember any other answer.
answered Dec 2 at 19:24
joan
47.9k34681
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As noted in Raspberry Pi Power Limitations (which you referenced) The newer Pi(3/2/B+) have a voltage monitor chip (APX803) which triggers at 4.63±0.07V. The Pi3B+ Pi3A+ use a MxL7704 chip to manage power, which has the same nominal trigger point.
The Pi has NO voltage measurement circuitry, this is an on/off trigger and there is no analog measurement circuitry. If you want to measure the voltage, you need a meter or one of the in-line USB monitors.
The GUI had a lightning bolt which comes up in the top right if the voltage is inadequate.
You do not need "a bigger supply" (whatever that means) you need a quality PSU whose voltage is adequate at the rated current - which most inexpensive supplies are not. Even with a decent Power Supply if you use poor quality cables you will have problems.
answered Dec 2 at 22:25
Milliways
27.5k1251109
What aboutvcgencmd measure_volts core? That would seem indicate some means of measuring voltage within the Pi.
– Edward
Dec 2 at 23:14
@Edward ... some context, since there's no man page... may be useful RPI vcgencmd usage
– RubberStamp
Dec 3 at 0:14
add a comment |
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
3
down vote
accepted
I do not think there is any Pi circuitry to return the current supply voltage.
As far as I am aware the under voltage circuitry is a piece of hardware which triggers at 4.65V. So you could discriminate between two values, more than 4.65V or less than 4.65V.
The only justification for this answer is I remember dozens of posts where people have asked the same question and I do not remember any other answer.
answered Dec 2 at 19:24
joan
47.9k34681
add a comment |
up vote
3
down vote
accepted
I do not think there is any Pi circuitry to return the current supply voltage.
As far as I am aware the under voltage circuitry is a piece of hardware which triggers at 4.65V. So you could discriminate between two values, more than 4.65V or less than 4.65V.
The only justification for this answer is I remember dozens of posts where people have asked the same question and I do not remember any other answer.
answered Dec 2 at 19:24
joan
47.9k34681
add a comment |
up vote
3
down vote
accepted
up vote
3
down vote
accepted
I do not think there is any Pi circuitry to return the current supply voltage.
As far as I am aware the under voltage circuitry is a piece of hardware which triggers at 4.65V. So you could discriminate between two values, more than 4.65V or less than 4.65V.
The only justification for this answer is I remember dozens of posts where people have asked the same question and I do not remember any other answer.
answered Dec 2 at 19:24
joan
47.9k34681
I do not think there is any Pi circuitry to return the current supply voltage.
As far as I am aware the under voltage circuitry is a piece of hardware which triggers at 4.65V. So you could discriminate between two values, more than 4.65V or less than 4.65V.
The only justification for this answer is I remember dozens of posts where people have asked the same question and I do not remember any other answer.
answered Dec 2 at 19:24
joan
47.9k34681
answered Dec 2 at 19:24
joan
47.9k34681
answered Dec 2 at 19:24
joan
47.9k34681
answered Dec 2 at 19:24
joan
47.9k34681
47.9k34681
add a comment |
add a comment |
up vote
2
down vote
As noted in Raspberry Pi Power Limitations (which you referenced) The newer Pi(3/2/B+) have a voltage monitor chip (APX803) which triggers at 4.63±0.07V. The Pi3B+ Pi3A+ use a MxL7704 chip to manage power, which has the same nominal trigger point.
The Pi has NO voltage measurement circuitry, this is an on/off trigger and there is no analog measurement circuitry. If you want to measure the voltage, you need a meter or one of the in-line USB monitors.
The GUI had a lightning bolt which comes up in the top right if the voltage is inadequate.
You do not need "a bigger supply" (whatever that means) you need a quality PSU whose voltage is adequate at the rated current - which most inexpensive supplies are not. Even with a decent Power Supply if you use poor quality cables you will have problems.
answered Dec 2 at 22:25
Milliways
27.5k1251109
What aboutvcgencmd measure_volts core? That would seem indicate some means of measuring voltage within the Pi.
– Edward
Dec 2 at 23:14
@Edward ... some context, since there's no man page... may be useful RPI vcgencmd usage
– RubberStamp
Dec 3 at 0:14
add a comment |
up vote
2
down vote
As noted in Raspberry Pi Power Limitations (which you referenced) The newer Pi(3/2/B+) have a voltage monitor chip (APX803) which triggers at 4.63±0.07V. The Pi3B+ Pi3A+ use a MxL7704 chip to manage power, which has the same nominal trigger point.
The Pi has NO voltage measurement circuitry, this is an on/off trigger and there is no analog measurement circuitry. If you want to measure the voltage, you need a meter or one of the in-line USB monitors.
The GUI had a lightning bolt which comes up in the top right if the voltage is inadequate.
You do not need "a bigger supply" (whatever that means) you need a quality PSU whose voltage is adequate at the rated current - which most inexpensive supplies are not. Even with a decent Power Supply if you use poor quality cables you will have problems.
answered Dec 2 at 22:25
Milliways
27.5k1251109
What aboutvcgencmd measure_volts core? That would seem indicate some means of measuring voltage within the Pi.
– Edward
Dec 2 at 23:14
@Edward ... some context, since there's no man page... may be useful RPI vcgencmd usage
– RubberStamp
Dec 3 at 0:14
add a comment |
up vote
2
down vote
up vote
2
down vote
As noted in Raspberry Pi Power Limitations (which you referenced) The newer Pi(3/2/B+) have a voltage monitor chip (APX803) which triggers at 4.63±0.07V. The Pi3B+ Pi3A+ use a MxL7704 chip to manage power, which has the same nominal trigger point.
The Pi has NO voltage measurement circuitry, this is an on/off trigger and there is no analog measurement circuitry. If you want to measure the voltage, you need a meter or one of the in-line USB monitors.
The GUI had a lightning bolt which comes up in the top right if the voltage is inadequate.
You do not need "a bigger supply" (whatever that means) you need a quality PSU whose voltage is adequate at the rated current - which most inexpensive supplies are not. Even with a decent Power Supply if you use poor quality cables you will have problems.
answered Dec 2 at 22:25
Milliways
27.5k1251109
As noted in Raspberry Pi Power Limitations (which you referenced) The newer Pi(3/2/B+) have a voltage monitor chip (APX803) which triggers at 4.63±0.07V. The Pi3B+ Pi3A+ use a MxL7704 chip to manage power, which has the same nominal trigger point.
The Pi has NO voltage measurement circuitry, this is an on/off trigger and there is no analog measurement circuitry. If you want to measure the voltage, you need a meter or one of the in-line USB monitors.
The GUI had a lightning bolt which comes up in the top right if the voltage is inadequate.
You do not need "a bigger supply" (whatever that means) you need a quality PSU whose voltage is adequate at the rated current - which most inexpensive supplies are not. Even with a decent Power Supply if you use poor quality cables you will have problems.
answered Dec 2 at 22:25
Milliways
27.5k1251109
answered Dec 2 at 22:25
Milliways
27.5k1251109
answered Dec 2 at 22:25
Milliways
27.5k1251109
answered Dec 2 at 22:25
Milliways
27.5k1251109
27.5k1251109
What aboutvcgencmd measure_volts core? That would seem indicate some means of measuring voltage within the Pi.
– Edward
Dec 2 at 23:14
@Edward ... some context, since there's no man page... may be useful RPI vcgencmd usage
– RubberStamp
Dec 3 at 0:14
add a comment |
What aboutvcgencmd measure_volts core? That would seem indicate some means of measuring voltage within the Pi.
– Edward
Dec 2 at 23:14
@Edward ... some context, since there's no man page... may be useful RPI vcgencmd usage
– RubberStamp
Dec 3 at 0:14
What about
vcgencmd measure_volts core? That would seem indicate some means of measuring voltage within the Pi.– Edward
Dec 2 at 23:14
What about
vcgencmd measure_volts core? That would seem indicate some means of measuring voltage within the Pi.– Edward
Dec 2 at 23:14
@Edward ... some context, since there's no man page... may be useful RPI vcgencmd usage
– RubberStamp
Dec 3 at 0:14
@Edward ... some context, since there's no man page... may be useful RPI vcgencmd usage
– RubberStamp
Dec 3 at 0:14
add a comment |
kabdulla is a new contributor. Be nice, and check out our Code of Conduct.
kabdulla is a new contributor. Be nice, and check out our Code of Conduct.
kabdulla is a new contributor. Be nice, and check out our Code of Conduct.
kabdulla is a new contributor. Be nice, and check out our Code of Conduct.
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