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How to “listen” to existing circuit
Shutdown Controller for Raspberry Pi in a carraspberry pi relayRaspberry Pi B+ with relay: Lights change but relays don't clickWhat is needed to switch a relay via logic output (e.g. from Raspberry Pi)?Funduino/Keyes relay board doesn't switch off relaysRelay to control the power rail on a PCI adapterHow to use CD40109BE to level shift one input from 3v to 5v?Using Raspberry to switch 12VA GPIO pin opening/closing a high power circuit?Controlling 12V Magnetic Latch Solenoid with RaspberryPi 3b
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$begingroup$
I have a joystick that is connected to an arcade board. I would like to “listen” for movement on the joystick using a Raspberry Pi or similar. The joystick runs on 12V, and I would be using the Raspberry Pi’s 3.3v GPIO.
Would a relay in series with the joystick signal wire be appropriate for this? If so would a fly back diode be recommended too?
This is the relay board that I was looking at (12V):
https://s.click.aliexpress.com/e/j9MIN2Y
Are there any precautions that I should take to avoid adversely affecting the existing system?
Thanks!
relay raspberry-pi
asked Jun 7 at 15:36
MichaelMichael
1112
New contributor
Michael is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
I have a joystick that is connected to an arcade board. I would like to “listen” for movement on the joystick using a Raspberry Pi or similar. The joystick runs on 12V, and I would be using the Raspberry Pi’s 3.3v GPIO.
Would a relay in series with the joystick signal wire be appropriate for this? If so would a fly back diode be recommended too?
This is the relay board that I was looking at (12V):
https://s.click.aliexpress.com/e/j9MIN2Y
Are there any precautions that I should take to avoid adversely affecting the existing system?
Thanks!
relay raspberry-pi
asked Jun 7 at 15:36
MichaelMichael
1112
New contributor
Michael is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
I have a joystick that is connected to an arcade board. I would like to “listen” for movement on the joystick using a Raspberry Pi or similar. The joystick runs on 12V, and I would be using the Raspberry Pi’s 3.3v GPIO.
Would a relay in series with the joystick signal wire be appropriate for this? If so would a fly back diode be recommended too?
This is the relay board that I was looking at (12V):
https://s.click.aliexpress.com/e/j9MIN2Y
Are there any precautions that I should take to avoid adversely affecting the existing system?
Thanks!
relay raspberry-pi
asked Jun 7 at 15:36
MichaelMichael
1112
New contributor
Michael 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 joystick that is connected to an arcade board. I would like to “listen” for movement on the joystick using a Raspberry Pi or similar. The joystick runs on 12V, and I would be using the Raspberry Pi’s 3.3v GPIO.
Would a relay in series with the joystick signal wire be appropriate for this? If so would a fly back diode be recommended too?
This is the relay board that I was looking at (12V):
https://s.click.aliexpress.com/e/j9MIN2Y
Are there any precautions that I should take to avoid adversely affecting the existing system?
Thanks!
relay raspberry-pi
relay raspberry-pi
asked Jun 7 at 15:36
MichaelMichael
1112
New contributor
Michael is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Jun 7 at 15:36
MichaelMichael
1112
New contributor
Michael is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Jun 7 at 15:36
MichaelMichael
1112
New contributor
Michael is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked Jun 7 at 15:36
MichaelMichael
1112
asked Jun 7 at 15:36
MichaelMichael
1112
1112
New contributor
Michael is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Michael 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 |
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
A relay is almost certainly NOT the right tool for the job.
The first step in wiretapping an interface in order reverse-engineer it is to determine the nature of the signals you want to look at. For voltage signals, you need a high-impedance buffer amplifier (like the input of an oscilloscope) that will cause minimal disruption to the existing circuit. For current signals, you need a low-impedance shunt or other measurement technology (e.g., Hall-effect), like the input to a milliammeter.
Other kinds of signals (such as capacitive, inductive or resistive sensors) might require some special ad-hoc techniques.
answered Jun 7 at 15:45
Dave Tweed♦Dave Tweed
128k10159276
$endgroup$
$begingroup$
I'm glad I asked before buying one. Would this coupled with an ADC be any use? i1.wp.com/henrysbench.capnfatz.com/wp-content/uploads/2014/11/…
$endgroup$
– Michael
Jun 7 at 20:04
$begingroup$
@Michael You should first determine if the signal is in fact a current signal and not a voltage or modulated signal. The ACS712 is designed for well one ampere so it's probably inappropriate even for a current-signal joystick.
$endgroup$
– Andrey Akhmetov
Jun 8 at 0:55
$begingroup$
@AndreyAkhmetov Since I am just interested in whether the circuit is open or closed, does it matter whether I check for voltage or current? As far as I am aware, the joystick mechanism is just a microswitch for each direction, the signal wire goes from the board to the microswitch, and then to ground back on the board.
$endgroup$
– Michael
Jun 8 at 20:02
$begingroup$
Actually, I'm not even particularly interested in which direction the joystick is being moved, so if there was a way to "listen' on the common ground wire coming out of the joystick then that would be even better for me.
$endgroup$
– Michael
Jun 8 at 20:12
$begingroup$
@Michael We've been under the assumption that we're interested in whether the switch is open/closed. If it's such a connection to ground then there's a decent chance that it's a voltage signal; check with test equipment to make certain (since you have the board and joystick available while we have to guess)
$endgroup$
– Andrey Akhmetov
Jun 8 at 22:28
add a comment |
Your Answer
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1 Answer
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1 Answer
1
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oldest
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active
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active
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votes
$begingroup$
A relay is almost certainly NOT the right tool for the job.
The first step in wiretapping an interface in order reverse-engineer it is to determine the nature of the signals you want to look at. For voltage signals, you need a high-impedance buffer amplifier (like the input of an oscilloscope) that will cause minimal disruption to the existing circuit. For current signals, you need a low-impedance shunt or other measurement technology (e.g., Hall-effect), like the input to a milliammeter.
Other kinds of signals (such as capacitive, inductive or resistive sensors) might require some special ad-hoc techniques.
answered Jun 7 at 15:45
Dave Tweed♦Dave Tweed
128k10159276
$endgroup$
$begingroup$
I'm glad I asked before buying one. Would this coupled with an ADC be any use? i1.wp.com/henrysbench.capnfatz.com/wp-content/uploads/2014/11/…
$endgroup$
– Michael
Jun 7 at 20:04
$begingroup$
@Michael You should first determine if the signal is in fact a current signal and not a voltage or modulated signal. The ACS712 is designed for well one ampere so it's probably inappropriate even for a current-signal joystick.
$endgroup$
– Andrey Akhmetov
Jun 8 at 0:55
$begingroup$
@AndreyAkhmetov Since I am just interested in whether the circuit is open or closed, does it matter whether I check for voltage or current? As far as I am aware, the joystick mechanism is just a microswitch for each direction, the signal wire goes from the board to the microswitch, and then to ground back on the board.
$endgroup$
– Michael
Jun 8 at 20:02
$begingroup$
Actually, I'm not even particularly interested in which direction the joystick is being moved, so if there was a way to "listen' on the common ground wire coming out of the joystick then that would be even better for me.
$endgroup$
– Michael
Jun 8 at 20:12
$begingroup$
@Michael We've been under the assumption that we're interested in whether the switch is open/closed. If it's such a connection to ground then there's a decent chance that it's a voltage signal; check with test equipment to make certain (since you have the board and joystick available while we have to guess)
$endgroup$
– Andrey Akhmetov
Jun 8 at 22:28
add a comment |
$begingroup$
A relay is almost certainly NOT the right tool for the job.
The first step in wiretapping an interface in order reverse-engineer it is to determine the nature of the signals you want to look at. For voltage signals, you need a high-impedance buffer amplifier (like the input of an oscilloscope) that will cause minimal disruption to the existing circuit. For current signals, you need a low-impedance shunt or other measurement technology (e.g., Hall-effect), like the input to a milliammeter.
Other kinds of signals (such as capacitive, inductive or resistive sensors) might require some special ad-hoc techniques.
answered Jun 7 at 15:45
Dave Tweed♦Dave Tweed
128k10159276
$endgroup$
$begingroup$
I'm glad I asked before buying one. Would this coupled with an ADC be any use? i1.wp.com/henrysbench.capnfatz.com/wp-content/uploads/2014/11/…
$endgroup$
– Michael
Jun 7 at 20:04
$begingroup$
@Michael You should first determine if the signal is in fact a current signal and not a voltage or modulated signal. The ACS712 is designed for well one ampere so it's probably inappropriate even for a current-signal joystick.
$endgroup$
– Andrey Akhmetov
Jun 8 at 0:55
$begingroup$
@AndreyAkhmetov Since I am just interested in whether the circuit is open or closed, does it matter whether I check for voltage or current? As far as I am aware, the joystick mechanism is just a microswitch for each direction, the signal wire goes from the board to the microswitch, and then to ground back on the board.
$endgroup$
– Michael
Jun 8 at 20:02
$begingroup$
Actually, I'm not even particularly interested in which direction the joystick is being moved, so if there was a way to "listen' on the common ground wire coming out of the joystick then that would be even better for me.
$endgroup$
– Michael
Jun 8 at 20:12
$begingroup$
@Michael We've been under the assumption that we're interested in whether the switch is open/closed. If it's such a connection to ground then there's a decent chance that it's a voltage signal; check with test equipment to make certain (since you have the board and joystick available while we have to guess)
$endgroup$
– Andrey Akhmetov
Jun 8 at 22:28
add a comment |
$begingroup$
A relay is almost certainly NOT the right tool for the job.
The first step in wiretapping an interface in order reverse-engineer it is to determine the nature of the signals you want to look at. For voltage signals, you need a high-impedance buffer amplifier (like the input of an oscilloscope) that will cause minimal disruption to the existing circuit. For current signals, you need a low-impedance shunt or other measurement technology (e.g., Hall-effect), like the input to a milliammeter.
Other kinds of signals (such as capacitive, inductive or resistive sensors) might require some special ad-hoc techniques.
answered Jun 7 at 15:45
Dave Tweed♦Dave Tweed
128k10159276
$endgroup$
A relay is almost certainly NOT the right tool for the job.
The first step in wiretapping an interface in order reverse-engineer it is to determine the nature of the signals you want to look at. For voltage signals, you need a high-impedance buffer amplifier (like the input of an oscilloscope) that will cause minimal disruption to the existing circuit. For current signals, you need a low-impedance shunt or other measurement technology (e.g., Hall-effect), like the input to a milliammeter.
Other kinds of signals (such as capacitive, inductive or resistive sensors) might require some special ad-hoc techniques.
answered Jun 7 at 15:45
Dave Tweed♦Dave Tweed
128k10159276
answered Jun 7 at 15:45
Dave Tweed♦Dave Tweed
128k10159276
answered Jun 7 at 15:45
Dave Tweed♦Dave Tweed
128k10159276
answered Jun 7 at 15:45
Dave Tweed♦Dave Tweed
128k10159276
128k10159276
$begingroup$
I'm glad I asked before buying one. Would this coupled with an ADC be any use? i1.wp.com/henrysbench.capnfatz.com/wp-content/uploads/2014/11/…
$endgroup$
– Michael
Jun 7 at 20:04
$begingroup$
@Michael You should first determine if the signal is in fact a current signal and not a voltage or modulated signal. The ACS712 is designed for well one ampere so it's probably inappropriate even for a current-signal joystick.
$endgroup$
– Andrey Akhmetov
Jun 8 at 0:55
$begingroup$
@AndreyAkhmetov Since I am just interested in whether the circuit is open or closed, does it matter whether I check for voltage or current? As far as I am aware, the joystick mechanism is just a microswitch for each direction, the signal wire goes from the board to the microswitch, and then to ground back on the board.
$endgroup$
– Michael
Jun 8 at 20:02
$begingroup$
Actually, I'm not even particularly interested in which direction the joystick is being moved, so if there was a way to "listen' on the common ground wire coming out of the joystick then that would be even better for me.
$endgroup$
– Michael
Jun 8 at 20:12
$begingroup$
@Michael We've been under the assumption that we're interested in whether the switch is open/closed. If it's such a connection to ground then there's a decent chance that it's a voltage signal; check with test equipment to make certain (since you have the board and joystick available while we have to guess)
$endgroup$
– Andrey Akhmetov
Jun 8 at 22:28
add a comment |
$begingroup$
I'm glad I asked before buying one. Would this coupled with an ADC be any use? i1.wp.com/henrysbench.capnfatz.com/wp-content/uploads/2014/11/…
$endgroup$
– Michael
Jun 7 at 20:04
$begingroup$
@Michael You should first determine if the signal is in fact a current signal and not a voltage or modulated signal. The ACS712 is designed for well one ampere so it's probably inappropriate even for a current-signal joystick.
$endgroup$
– Andrey Akhmetov
Jun 8 at 0:55
$begingroup$
@AndreyAkhmetov Since I am just interested in whether the circuit is open or closed, does it matter whether I check for voltage or current? As far as I am aware, the joystick mechanism is just a microswitch for each direction, the signal wire goes from the board to the microswitch, and then to ground back on the board.
$endgroup$
– Michael
Jun 8 at 20:02
$begingroup$
Actually, I'm not even particularly interested in which direction the joystick is being moved, so if there was a way to "listen' on the common ground wire coming out of the joystick then that would be even better for me.
$endgroup$
– Michael
Jun 8 at 20:12
$begingroup$
@Michael We've been under the assumption that we're interested in whether the switch is open/closed. If it's such a connection to ground then there's a decent chance that it's a voltage signal; check with test equipment to make certain (since you have the board and joystick available while we have to guess)
$endgroup$
– Andrey Akhmetov
Jun 8 at 22:28
$begingroup$
I'm glad I asked before buying one. Would this coupled with an ADC be any use? i1.wp.com/henrysbench.capnfatz.com/wp-content/uploads/2014/11/…
$endgroup$
– Michael
Jun 7 at 20:04
$begingroup$
I'm glad I asked before buying one. Would this coupled with an ADC be any use? i1.wp.com/henrysbench.capnfatz.com/wp-content/uploads/2014/11/…
$endgroup$
– Michael
Jun 7 at 20:04
$begingroup$
@Michael You should first determine if the signal is in fact a current signal and not a voltage or modulated signal. The ACS712 is designed for well one ampere so it's probably inappropriate even for a current-signal joystick.
$endgroup$
– Andrey Akhmetov
Jun 8 at 0:55
$begingroup$
@Michael You should first determine if the signal is in fact a current signal and not a voltage or modulated signal. The ACS712 is designed for well one ampere so it's probably inappropriate even for a current-signal joystick.
$endgroup$
– Andrey Akhmetov
Jun 8 at 0:55
$begingroup$
@AndreyAkhmetov Since I am just interested in whether the circuit is open or closed, does it matter whether I check for voltage or current? As far as I am aware, the joystick mechanism is just a microswitch for each direction, the signal wire goes from the board to the microswitch, and then to ground back on the board.
$endgroup$
– Michael
Jun 8 at 20:02
$begingroup$
@AndreyAkhmetov Since I am just interested in whether the circuit is open or closed, does it matter whether I check for voltage or current? As far as I am aware, the joystick mechanism is just a microswitch for each direction, the signal wire goes from the board to the microswitch, and then to ground back on the board.
$endgroup$
– Michael
Jun 8 at 20:02
$begingroup$
Actually, I'm not even particularly interested in which direction the joystick is being moved, so if there was a way to "listen' on the common ground wire coming out of the joystick then that would be even better for me.
$endgroup$
– Michael
Jun 8 at 20:12
$begingroup$
Actually, I'm not even particularly interested in which direction the joystick is being moved, so if there was a way to "listen' on the common ground wire coming out of the joystick then that would be even better for me.
$endgroup$
– Michael
Jun 8 at 20:12
$begingroup$
@Michael We've been under the assumption that we're interested in whether the switch is open/closed. If it's such a connection to ground then there's a decent chance that it's a voltage signal; check with test equipment to make certain (since you have the board and joystick available while we have to guess)
$endgroup$
– Andrey Akhmetov
Jun 8 at 22:28
$begingroup$
@Michael We've been under the assumption that we're interested in whether the switch is open/closed. If it's such a connection to ground then there's a decent chance that it's a voltage signal; check with test equipment to make certain (since you have the board and joystick available while we have to guess)
$endgroup$
– Andrey Akhmetov
Jun 8 at 22:28
add a comment |
Michael is a new contributor. Be nice, and check out our Code of Conduct.
Michael is a new contributor. Be nice, and check out our Code of Conduct.
Michael is a new contributor. Be nice, and check out our Code of Conduct.
Michael is a new contributor. Be nice, and check out our Code of Conduct.
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