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PWM on 5V GPIO pin
Where is the PWM pin located exactly on the board?I2Cs for temperature senors and multiple PWM outsCan't PWM LED on pin 18Simple DC Solenoid Valve Circuit, How to size components?ALSA - piezo buzzer directly on PWM pin?Can't open pwm pinGPIO PWM reset to high
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I have a 12V Noctua industrial fan (it's for a project, the amount of airflow is needed). The fan doesn't turn on by itself (with only 12V and GND connected), but it does turn on when I connect GPIO pin in HIGH state from Raspberry into PWM connector. Although the fan does turn on, every time I use PWM with GPIO pin fan turns off, thus making the fan uncontrollable.
From what I've searched I need 5V input to control the fan using PWM connector (why does it turn on with only 3V is unknown). So basically I need a 5V rail for PWM controlled via 3V GPIO pin. What should I use? Some transistor? Or is there IC for this?
pwm
asked 8 hours ago
Astra3Astra3
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Astra3 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
I have a 12V Noctua industrial fan (it's for a project, the amount of airflow is needed). The fan doesn't turn on by itself (with only 12V and GND connected), but it does turn on when I connect GPIO pin in HIGH state from Raspberry into PWM connector. Although the fan does turn on, every time I use PWM with GPIO pin fan turns off, thus making the fan uncontrollable.
From what I've searched I need 5V input to control the fan using PWM connector (why does it turn on with only 3V is unknown). So basically I need a 5V rail for PWM controlled via 3V GPIO pin. What should I use? Some transistor? Or is there IC for this?
pwm
asked 8 hours ago
Astra3Astra3
111 bronze badge
New contributor
Astra3 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Hi @Astra3, Must read white bible: Noctua PWM specifications white paper noctua.at/media/wysiwyg/…. Now some quick and dirty, not verified comments: (1) PWM signal must be 5V. (2) Therefore must step up GPIO 3V3 signal to 5V, (3) Do not use bidirectional 3V3/5V logical level converters. They are good for I2C type open drain circuits, but weak and problematic to push pull driving. I would recommend HCT125 undirectional push/pull driver (checkout AdaFruit), (4) Don't use GPIO to drive the tachometer/RPM speed fan output signal. might fry Rpi!
– tlfong01
2 mins ago
add a comment |
I have a 12V Noctua industrial fan (it's for a project, the amount of airflow is needed). The fan doesn't turn on by itself (with only 12V and GND connected), but it does turn on when I connect GPIO pin in HIGH state from Raspberry into PWM connector. Although the fan does turn on, every time I use PWM with GPIO pin fan turns off, thus making the fan uncontrollable.
From what I've searched I need 5V input to control the fan using PWM connector (why does it turn on with only 3V is unknown). So basically I need a 5V rail for PWM controlled via 3V GPIO pin. What should I use? Some transistor? Or is there IC for this?
pwm
asked 8 hours ago
Astra3Astra3
111 bronze badge
New contributor
Astra3 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I have a 12V Noctua industrial fan (it's for a project, the amount of airflow is needed). The fan doesn't turn on by itself (with only 12V and GND connected), but it does turn on when I connect GPIO pin in HIGH state from Raspberry into PWM connector. Although the fan does turn on, every time I use PWM with GPIO pin fan turns off, thus making the fan uncontrollable.
From what I've searched I need 5V input to control the fan using PWM connector (why does it turn on with only 3V is unknown). So basically I need a 5V rail for PWM controlled via 3V GPIO pin. What should I use? Some transistor? Or is there IC for this?
pwm
pwm
asked 8 hours ago
Astra3Astra3
111 bronze badge
New contributor
Astra3 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Astra3Astra3
111 bronze badge
New contributor
Astra3 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Astra3Astra3
111 bronze badge
New contributor
Astra3 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 8 hours ago
Astra3Astra3
111 bronze badge
asked 8 hours ago
Astra3Astra3
111 bronze badge
111 bronze badge
New contributor
Astra3 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Astra3 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Hi @Astra3, Must read white bible: Noctua PWM specifications white paper noctua.at/media/wysiwyg/…. Now some quick and dirty, not verified comments: (1) PWM signal must be 5V. (2) Therefore must step up GPIO 3V3 signal to 5V, (3) Do not use bidirectional 3V3/5V logical level converters. They are good for I2C type open drain circuits, but weak and problematic to push pull driving. I would recommend HCT125 undirectional push/pull driver (checkout AdaFruit), (4) Don't use GPIO to drive the tachometer/RPM speed fan output signal. might fry Rpi!
– tlfong01
2 mins ago
add a comment |
Hi @Astra3, Must read white bible: Noctua PWM specifications white paper noctua.at/media/wysiwyg/…. Now some quick and dirty, not verified comments: (1) PWM signal must be 5V. (2) Therefore must step up GPIO 3V3 signal to 5V, (3) Do not use bidirectional 3V3/5V logical level converters. They are good for I2C type open drain circuits, but weak and problematic to push pull driving. I would recommend HCT125 undirectional push/pull driver (checkout AdaFruit), (4) Don't use GPIO to drive the tachometer/RPM speed fan output signal. might fry Rpi!
– tlfong01
2 mins ago
Hi @Astra3, Must read white bible: Noctua PWM specifications white paper noctua.at/media/wysiwyg/…. Now some quick and dirty, not verified comments: (1) PWM signal must be 5V. (2) Therefore must step up GPIO 3V3 signal to 5V, (3) Do not use bidirectional 3V3/5V logical level converters. They are good for I2C type open drain circuits, but weak and problematic to push pull driving. I would recommend HCT125 undirectional push/pull driver (checkout AdaFruit), (4) Don't use GPIO to drive the tachometer/RPM speed fan output signal. might fry Rpi!
– tlfong01
2 mins ago
Hi @Astra3, Must read white bible: Noctua PWM specifications white paper noctua.at/media/wysiwyg/…. Now some quick and dirty, not verified comments: (1) PWM signal must be 5V. (2) Therefore must step up GPIO 3V3 signal to 5V, (3) Do not use bidirectional 3V3/5V logical level converters. They are good for I2C type open drain circuits, but weak and problematic to push pull driving. I would recommend HCT125 undirectional push/pull driver (checkout AdaFruit), (4) Don't use GPIO to drive the tachometer/RPM speed fan output signal. might fry Rpi!
– tlfong01
2 mins ago
add a comment |
1 Answer
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If you take a look at the spec sheet for that fan (the fan you linked is a 4-pin varient):
You'll see that the PWM signal pin must be 5V. Now why it works with 3.3V (GPIO voltage) is likely because high on 5V is usually not exactly 5V, but that doesn't explain why it only works when the GPIO is held steady on and not PWM.
Anyways, you can use a simple step-up level shifter to convert your 3.3V PWM signal to 5V. Hackaday has a fantastic tutorial on this. However, if you'd rather just buy a pre-built solution instead of wiring your own circuit, SparkFun sells this bi-directional 5v to 3.3v logic converter, which I've used in the past with great results.
answered 8 hours ago
Patrick CookPatrick Cook
5,0254 gold badges26 silver badges56 bronze badges
Ok, so in my case and in case of SparkFun's board, if I connect 5V to LV and GPIO to LV1, then set GPIO to high I should get 5V at HV1. Did I understood it correctly?
– Astra3
7 hours ago
1
@Astra3 Not quite, this snippet is from that product page: "The level converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the 'HV' pin, low voltage (3.3V for example) to 'LV', and ground from the system to the 'GND' pin." I highly recommend reading their tutorial before doing anything if you are unsure: learn.sparkfun.com/tutorials/….
– Patrick Cook
7 hours ago
add a comment |
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1 Answer
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If you take a look at the spec sheet for that fan (the fan you linked is a 4-pin varient):
You'll see that the PWM signal pin must be 5V. Now why it works with 3.3V (GPIO voltage) is likely because high on 5V is usually not exactly 5V, but that doesn't explain why it only works when the GPIO is held steady on and not PWM.
Anyways, you can use a simple step-up level shifter to convert your 3.3V PWM signal to 5V. Hackaday has a fantastic tutorial on this. However, if you'd rather just buy a pre-built solution instead of wiring your own circuit, SparkFun sells this bi-directional 5v to 3.3v logic converter, which I've used in the past with great results.
answered 8 hours ago
Patrick CookPatrick Cook
5,0254 gold badges26 silver badges56 bronze badges
Ok, so in my case and in case of SparkFun's board, if I connect 5V to LV and GPIO to LV1, then set GPIO to high I should get 5V at HV1. Did I understood it correctly?
– Astra3
7 hours ago
1
@Astra3 Not quite, this snippet is from that product page: "The level converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the 'HV' pin, low voltage (3.3V for example) to 'LV', and ground from the system to the 'GND' pin." I highly recommend reading their tutorial before doing anything if you are unsure: learn.sparkfun.com/tutorials/….
– Patrick Cook
7 hours ago
add a comment |
If you take a look at the spec sheet for that fan (the fan you linked is a 4-pin varient):
You'll see that the PWM signal pin must be 5V. Now why it works with 3.3V (GPIO voltage) is likely because high on 5V is usually not exactly 5V, but that doesn't explain why it only works when the GPIO is held steady on and not PWM.
Anyways, you can use a simple step-up level shifter to convert your 3.3V PWM signal to 5V. Hackaday has a fantastic tutorial on this. However, if you'd rather just buy a pre-built solution instead of wiring your own circuit, SparkFun sells this bi-directional 5v to 3.3v logic converter, which I've used in the past with great results.
answered 8 hours ago
Patrick CookPatrick Cook
5,0254 gold badges26 silver badges56 bronze badges
Ok, so in my case and in case of SparkFun's board, if I connect 5V to LV and GPIO to LV1, then set GPIO to high I should get 5V at HV1. Did I understood it correctly?
– Astra3
7 hours ago
1
@Astra3 Not quite, this snippet is from that product page: "The level converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the 'HV' pin, low voltage (3.3V for example) to 'LV', and ground from the system to the 'GND' pin." I highly recommend reading their tutorial before doing anything if you are unsure: learn.sparkfun.com/tutorials/….
– Patrick Cook
7 hours ago
add a comment |
If you take a look at the spec sheet for that fan (the fan you linked is a 4-pin varient):
You'll see that the PWM signal pin must be 5V. Now why it works with 3.3V (GPIO voltage) is likely because high on 5V is usually not exactly 5V, but that doesn't explain why it only works when the GPIO is held steady on and not PWM.
Anyways, you can use a simple step-up level shifter to convert your 3.3V PWM signal to 5V. Hackaday has a fantastic tutorial on this. However, if you'd rather just buy a pre-built solution instead of wiring your own circuit, SparkFun sells this bi-directional 5v to 3.3v logic converter, which I've used in the past with great results.
answered 8 hours ago
Patrick CookPatrick Cook
5,0254 gold badges26 silver badges56 bronze badges
If you take a look at the spec sheet for that fan (the fan you linked is a 4-pin varient):
You'll see that the PWM signal pin must be 5V. Now why it works with 3.3V (GPIO voltage) is likely because high on 5V is usually not exactly 5V, but that doesn't explain why it only works when the GPIO is held steady on and not PWM.
Anyways, you can use a simple step-up level shifter to convert your 3.3V PWM signal to 5V. Hackaday has a fantastic tutorial on this. However, if you'd rather just buy a pre-built solution instead of wiring your own circuit, SparkFun sells this bi-directional 5v to 3.3v logic converter, which I've used in the past with great results.
answered 8 hours ago
Patrick CookPatrick Cook
5,0254 gold badges26 silver badges56 bronze badges
answered 8 hours ago
Patrick CookPatrick Cook
5,0254 gold badges26 silver badges56 bronze badges
answered 8 hours ago
Patrick CookPatrick Cook
5,0254 gold badges26 silver badges56 bronze badges
answered 8 hours ago
Patrick CookPatrick Cook
5,0254 gold badges26 silver badges56 bronze badges
5,0254 gold badges26 silver badges56 bronze badges
Ok, so in my case and in case of SparkFun's board, if I connect 5V to LV and GPIO to LV1, then set GPIO to high I should get 5V at HV1. Did I understood it correctly?
– Astra3
7 hours ago
1
@Astra3 Not quite, this snippet is from that product page: "The level converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the 'HV' pin, low voltage (3.3V for example) to 'LV', and ground from the system to the 'GND' pin." I highly recommend reading their tutorial before doing anything if you are unsure: learn.sparkfun.com/tutorials/….
– Patrick Cook
7 hours ago
add a comment |
Ok, so in my case and in case of SparkFun's board, if I connect 5V to LV and GPIO to LV1, then set GPIO to high I should get 5V at HV1. Did I understood it correctly?
– Astra3
7 hours ago
1
@Astra3 Not quite, this snippet is from that product page: "The level converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the 'HV' pin, low voltage (3.3V for example) to 'LV', and ground from the system to the 'GND' pin." I highly recommend reading their tutorial before doing anything if you are unsure: learn.sparkfun.com/tutorials/….
– Patrick Cook
7 hours ago
Ok, so in my case and in case of SparkFun's board, if I connect 5V to LV and GPIO to LV1, then set GPIO to high I should get 5V at HV1. Did I understood it correctly?
– Astra3
7 hours ago
Ok, so in my case and in case of SparkFun's board, if I connect 5V to LV and GPIO to LV1, then set GPIO to high I should get 5V at HV1. Did I understood it correctly?
– Astra3
7 hours ago
1
1
@Astra3 Not quite, this snippet is from that product page: "The level converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the 'HV' pin, low voltage (3.3V for example) to 'LV', and ground from the system to the 'GND' pin." I highly recommend reading their tutorial before doing anything if you are unsure: learn.sparkfun.com/tutorials/….
– Patrick Cook
7 hours ago
@Astra3 Not quite, this snippet is from that product page: "The level converter is very easy to use. The board needs to be powered from the two voltages sources (high voltage and low voltage) that your system is using. High voltage (5V for example) to the 'HV' pin, low voltage (3.3V for example) to 'LV', and ground from the system to the 'GND' pin." I highly recommend reading their tutorial before doing anything if you are unsure: learn.sparkfun.com/tutorials/….
– Patrick Cook
7 hours ago
add a comment |
Astra3 is a new contributor. Be nice, and check out our Code of Conduct.
Astra3 is a new contributor. Be nice, and check out our Code of Conduct.
Astra3 is a new contributor. Be nice, and check out our Code of Conduct.
Astra3 is a new contributor. Be nice, and check out our Code of Conduct.
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Hi @Astra3, Must read white bible: Noctua PWM specifications white paper noctua.at/media/wysiwyg/…. Now some quick and dirty, not verified comments: (1) PWM signal must be 5V. (2) Therefore must step up GPIO 3V3 signal to 5V, (3) Do not use bidirectional 3V3/5V logical level converters. They are good for I2C type open drain circuits, but weak and problematic to push pull driving. I would recommend HCT125 undirectional push/pull driver (checkout AdaFruit), (4) Don't use GPIO to drive the tachometer/RPM speed fan output signal. might fry Rpi!
– tlfong01
2 mins ago