Mute PAM8302 amp with Raspberry Pi
I'm using a PAM8302 amplifier with a Raspberry Pi Zero W and it's working great. However, I'd like to start the amp muted and then unmute it from a Python script. Per documentation, PAM8302 goes into shutdown when the shutdown pin is connected to ground and I verified that by connecting it to RPi's ground. I tried connecting the shutdown pin to a GPIO pin that starts low and one that starts high (measured ~0V and 3.3V respectively), and neither mutes the amp. If I hook it up to ground it mutes, but I can't unmute it, since ground pins aren't controllable. Is there a way I can have programmatic control over the mute function? The only way I can think of is using a relay, but I'd rather avoid it if at all possible.
Thanks!
python
asked Feb 2 at 18:52
Nik I.Nik I.
31
migrated from superuser.com Feb 2 at 20:41
This question came from our site for computer enthusiasts and power users.
add a comment |
I'm using a PAM8302 amplifier with a Raspberry Pi Zero W and it's working great. However, I'd like to start the amp muted and then unmute it from a Python script. Per documentation, PAM8302 goes into shutdown when the shutdown pin is connected to ground and I verified that by connecting it to RPi's ground. I tried connecting the shutdown pin to a GPIO pin that starts low and one that starts high (measured ~0V and 3.3V respectively), and neither mutes the amp. If I hook it up to ground it mutes, but I can't unmute it, since ground pins aren't controllable. Is there a way I can have programmatic control over the mute function? The only way I can think of is using a relay, but I'd rather avoid it if at all possible.
Thanks!
python
asked Feb 2 at 18:52
Nik I.Nik I.
31
migrated from superuser.com Feb 2 at 20:41
This question came from our site for computer enthusiasts and power users.
GPIO pin that starts low.... are you sure that it starts low?
– jsotola
Feb 2 at 21:41
I measured the voltage between the pin and ground and it was hovering around 0.3mv
– Nik I.
Feb 3 at 17:54
that measurement is taken with the PAM8302 connected?
– jsotola
Feb 3 at 19:04
add a comment |
I'm using a PAM8302 amplifier with a Raspberry Pi Zero W and it's working great. However, I'd like to start the amp muted and then unmute it from a Python script. Per documentation, PAM8302 goes into shutdown when the shutdown pin is connected to ground and I verified that by connecting it to RPi's ground. I tried connecting the shutdown pin to a GPIO pin that starts low and one that starts high (measured ~0V and 3.3V respectively), and neither mutes the amp. If I hook it up to ground it mutes, but I can't unmute it, since ground pins aren't controllable. Is there a way I can have programmatic control over the mute function? The only way I can think of is using a relay, but I'd rather avoid it if at all possible.
Thanks!
python
asked Feb 2 at 18:52
Nik I.Nik I.
31
I'm using a PAM8302 amplifier with a Raspberry Pi Zero W and it's working great. However, I'd like to start the amp muted and then unmute it from a Python script. Per documentation, PAM8302 goes into shutdown when the shutdown pin is connected to ground and I verified that by connecting it to RPi's ground. I tried connecting the shutdown pin to a GPIO pin that starts low and one that starts high (measured ~0V and 3.3V respectively), and neither mutes the amp. If I hook it up to ground it mutes, but I can't unmute it, since ground pins aren't controllable. Is there a way I can have programmatic control over the mute function? The only way I can think of is using a relay, but I'd rather avoid it if at all possible.
Thanks!
python
python
asked Feb 2 at 18:52
Nik I.Nik I.
31
asked Feb 2 at 18:52
Nik I.Nik I.
31
asked Feb 2 at 18:52
Nik I.Nik I.
31
asked Feb 2 at 18:52
Nik I.Nik I.
31
asked Feb 2 at 18:52
Nik I.Nik I.
31
31
migrated from superuser.com Feb 2 at 20:41
This question came from our site for computer enthusiasts and power users.
migrated from superuser.com Feb 2 at 20:41
This question came from our site for computer enthusiasts and power users.
GPIO pin that starts low.... are you sure that it starts low?
– jsotola
Feb 2 at 21:41
I measured the voltage between the pin and ground and it was hovering around 0.3mv
– Nik I.
Feb 3 at 17:54
that measurement is taken with the PAM8302 connected?
– jsotola
Feb 3 at 19:04
add a comment |
GPIO pin that starts low.... are you sure that it starts low?
– jsotola
Feb 2 at 21:41
I measured the voltage between the pin and ground and it was hovering around 0.3mv
– Nik I.
Feb 3 at 17:54
that measurement is taken with the PAM8302 connected?
– jsotola
Feb 3 at 19:04
GPIO pin that starts low .... are you sure that it starts low?– jsotola
Feb 2 at 21:41
GPIO pin that starts low .... are you sure that it starts low?– jsotola
Feb 2 at 21:41
I measured the voltage between the pin and ground and it was hovering around 0.3mv
– Nik I.
Feb 3 at 17:54
I measured the voltage between the pin and ground and it was hovering around 0.3mv
– Nik I.
Feb 3 at 17:54
that measurement is taken with the PAM8302 connected?
– jsotola
Feb 3 at 19:04
that measurement is taken with the PAM8302 connected?
– jsotola
Feb 3 at 19:04
add a comment |
1 Answer
1
active
oldest
votes
All GPIO pins start as inputs by default. This is normal for most similar devices.
NONE start as outputs, low or high, although the input pins may have a pull-up or pull-down.
The Device Tree can be used to change pin assignments shortly after boot. This is often used to enable the serial interface etc.
To configure a pin as output you need an appropriate Device Tree overlay.
The gpio config can be used to set the configuring pins at "boot" time - actually some short time after boot.
answered Feb 2 at 22:27
MilliwaysMilliways
29.8k1355116
Thank you!! I'll give it a go and report the result.
– Nik I.
Feb 3 at 17:54
It worked!! I edited /boot/config.txt and addedgpio=26=op,dlwhere 26 is the GPIO pin connected to the amp's shutdown pin. It mutes it in less than a second after power is supplied to the board. Thank you for your help!
– Nik I.
Feb 5 at 1:41
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
All GPIO pins start as inputs by default. This is normal for most similar devices.
NONE start as outputs, low or high, although the input pins may have a pull-up or pull-down.
The Device Tree can be used to change pin assignments shortly after boot. This is often used to enable the serial interface etc.
To configure a pin as output you need an appropriate Device Tree overlay.
The gpio config can be used to set the configuring pins at "boot" time - actually some short time after boot.
answered Feb 2 at 22:27
MilliwaysMilliways
29.8k1355116
Thank you!! I'll give it a go and report the result.
– Nik I.
Feb 3 at 17:54
It worked!! I edited /boot/config.txt and addedgpio=26=op,dlwhere 26 is the GPIO pin connected to the amp's shutdown pin. It mutes it in less than a second after power is supplied to the board. Thank you for your help!
– Nik I.
Feb 5 at 1:41
add a comment |
All GPIO pins start as inputs by default. This is normal for most similar devices.
NONE start as outputs, low or high, although the input pins may have a pull-up or pull-down.
The Device Tree can be used to change pin assignments shortly after boot. This is often used to enable the serial interface etc.
To configure a pin as output you need an appropriate Device Tree overlay.
The gpio config can be used to set the configuring pins at "boot" time - actually some short time after boot.
answered Feb 2 at 22:27
MilliwaysMilliways
29.8k1355116
Thank you!! I'll give it a go and report the result.
– Nik I.
Feb 3 at 17:54
It worked!! I edited /boot/config.txt and addedgpio=26=op,dlwhere 26 is the GPIO pin connected to the amp's shutdown pin. It mutes it in less than a second after power is supplied to the board. Thank you for your help!
– Nik I.
Feb 5 at 1:41
add a comment |
All GPIO pins start as inputs by default. This is normal for most similar devices.
NONE start as outputs, low or high, although the input pins may have a pull-up or pull-down.
The Device Tree can be used to change pin assignments shortly after boot. This is often used to enable the serial interface etc.
To configure a pin as output you need an appropriate Device Tree overlay.
The gpio config can be used to set the configuring pins at "boot" time - actually some short time after boot.
answered Feb 2 at 22:27
MilliwaysMilliways
29.8k1355116
All GPIO pins start as inputs by default. This is normal for most similar devices.
NONE start as outputs, low or high, although the input pins may have a pull-up or pull-down.
The Device Tree can be used to change pin assignments shortly after boot. This is often used to enable the serial interface etc.
To configure a pin as output you need an appropriate Device Tree overlay.
The gpio config can be used to set the configuring pins at "boot" time - actually some short time after boot.
answered Feb 2 at 22:27
MilliwaysMilliways
29.8k1355116
answered Feb 2 at 22:27
MilliwaysMilliways
29.8k1355116
answered Feb 2 at 22:27
MilliwaysMilliways
29.8k1355116
answered Feb 2 at 22:27
MilliwaysMilliways
29.8k1355116
29.8k1355116
Thank you!! I'll give it a go and report the result.
– Nik I.
Feb 3 at 17:54
It worked!! I edited /boot/config.txt and addedgpio=26=op,dlwhere 26 is the GPIO pin connected to the amp's shutdown pin. It mutes it in less than a second after power is supplied to the board. Thank you for your help!
– Nik I.
Feb 5 at 1:41
add a comment |
Thank you!! I'll give it a go and report the result.
– Nik I.
Feb 3 at 17:54
It worked!! I edited /boot/config.txt and addedgpio=26=op,dlwhere 26 is the GPIO pin connected to the amp's shutdown pin. It mutes it in less than a second after power is supplied to the board. Thank you for your help!
– Nik I.
Feb 5 at 1:41
Thank you!! I'll give it a go and report the result.
– Nik I.
Feb 3 at 17:54
Thank you!! I'll give it a go and report the result.
– Nik I.
Feb 3 at 17:54
It worked!! I edited /boot/config.txt and added
gpio=26=op,dl where 26 is the GPIO pin connected to the amp's shutdown pin. It mutes it in less than a second after power is supplied to the board. Thank you for your help!– Nik I.
Feb 5 at 1:41
It worked!! I edited /boot/config.txt and added
gpio=26=op,dl where 26 is the GPIO pin connected to the amp's shutdown pin. It mutes it in less than a second after power is supplied to the board. Thank you for your help!– Nik I.
Feb 5 at 1:41
add a comment |
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GPIO pin that starts low.... are you sure that it starts low?– jsotola
Feb 2 at 21:41
I measured the voltage between the pin and ground and it was hovering around 0.3mv
– Nik I.
Feb 3 at 17:54
that measurement is taken with the PAM8302 connected?
– jsotola
Feb 3 at 19:04