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Why can't I see bouncing of switch on oscilloscope screen?
How can I project an oscilloscope display on to a wall screenHow do I 'scope a mains appliance?Simulating circuits online, oscilloscope?Send a frequency impulse when switch is activeCannot get a digital square wave on oscilloscope from the GPIO of the Raspberry Pi?First checks after oscilloscope unboxingLM311 Circuit only works when probe is attachedOscilloscope ground lead - BANG!Understanding oscilloscope patternHow to debounce a low pulse switch for automotive lighting
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty margin-bottom:0;
$begingroup$
I'm trying to view bouncing of a simple switch on the oscilloscope. I have prepared a simple breadboard circuit (power->switch->resistor->ground). The problem is, it is displayed as perfect square/rectangle on the scope. I have attached a photo of scope screen and circuit. Please help me to identify why I can't catch bouncing of the switch on the scope. I don't think it this is a non-bouncing switch.
Edit: I have added a 3rd photo showing zoomed in time scale, 50uSec. As you can see it is rising 0 to 9v within 150uSec and staying there. I have tried a few different switches. Resistor in the picture is 220ohm 0.5w resistor.
switches oscilloscope debounce
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
|
show 9 more comments
$begingroup$
I'm trying to view bouncing of a simple switch on the oscilloscope. I have prepared a simple breadboard circuit (power->switch->resistor->ground). The problem is, it is displayed as perfect square/rectangle on the scope. I have attached a photo of scope screen and circuit. Please help me to identify why I can't catch bouncing of the switch on the scope. I don't think it this is a non-bouncing switch.
Edit: I have added a 3rd photo showing zoomed in time scale, 50uSec. As you can see it is rising 0 to 9v within 150uSec and staying there. I have tried a few different switches. Resistor in the picture is 220ohm 0.5w resistor.
switches oscilloscope debounce
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
6
$begingroup$
Have you tried adjusting the time base / horizontal scale?
$endgroup$
– NMF
57 mins ago
$begingroup$
Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
$endgroup$
– Toor
55 mins ago
$begingroup$
As NMF says, you want to see an edge. Zoom in on it.
$endgroup$
– StainlessSteelRat
55 mins ago
1
$begingroup$
If you don't succeed on the first try, try again.
$endgroup$
– StainlessSteelRat
52 mins ago
1
$begingroup$
My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
$endgroup$
– Deniz
8 mins ago
|
show 9 more comments
$begingroup$
I'm trying to view bouncing of a simple switch on the oscilloscope. I have prepared a simple breadboard circuit (power->switch->resistor->ground). The problem is, it is displayed as perfect square/rectangle on the scope. I have attached a photo of scope screen and circuit. Please help me to identify why I can't catch bouncing of the switch on the scope. I don't think it this is a non-bouncing switch.
Edit: I have added a 3rd photo showing zoomed in time scale, 50uSec. As you can see it is rising 0 to 9v within 150uSec and staying there. I have tried a few different switches. Resistor in the picture is 220ohm 0.5w resistor.
switches oscilloscope debounce
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I'm trying to view bouncing of a simple switch on the oscilloscope. I have prepared a simple breadboard circuit (power->switch->resistor->ground). The problem is, it is displayed as perfect square/rectangle on the scope. I have attached a photo of scope screen and circuit. Please help me to identify why I can't catch bouncing of the switch on the scope. I don't think it this is a non-bouncing switch.
Edit: I have added a 3rd photo showing zoomed in time scale, 50uSec. As you can see it is rising 0 to 9v within 150uSec and staying there. I have tried a few different switches. Resistor in the picture is 220ohm 0.5w resistor.
switches oscilloscope debounce
switches oscilloscope debounce
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 25 mins ago
Deniz
asked 1 hour ago
DenizDeniz
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 1 hour ago
DenizDeniz
1113
asked 1 hour ago
DenizDeniz
1113
1113
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Deniz is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
6
$begingroup$
Have you tried adjusting the time base / horizontal scale?
$endgroup$
– NMF
57 mins ago
$begingroup$
Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
$endgroup$
– Toor
55 mins ago
$begingroup$
As NMF says, you want to see an edge. Zoom in on it.
$endgroup$
– StainlessSteelRat
55 mins ago
1
$begingroup$
If you don't succeed on the first try, try again.
$endgroup$
– StainlessSteelRat
52 mins ago
1
$begingroup$
My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
$endgroup$
– Deniz
8 mins ago
|
show 9 more comments
6
$begingroup$
Have you tried adjusting the time base / horizontal scale?
$endgroup$
– NMF
57 mins ago
$begingroup$
Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
$endgroup$
– Toor
55 mins ago
$begingroup$
As NMF says, you want to see an edge. Zoom in on it.
$endgroup$
– StainlessSteelRat
55 mins ago
1
$begingroup$
If you don't succeed on the first try, try again.
$endgroup$
– StainlessSteelRat
52 mins ago
1
$begingroup$
My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
$endgroup$
– Deniz
8 mins ago
6
6
$begingroup$
Have you tried adjusting the time base / horizontal scale?
$endgroup$
– NMF
57 mins ago
$begingroup$
Have you tried adjusting the time base / horizontal scale?
$endgroup$
– NMF
57 mins ago
$begingroup$
Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
$endgroup$
– Toor
55 mins ago
$begingroup$
Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
$endgroup$
– Toor
55 mins ago
$begingroup$
As NMF says, you want to see an edge. Zoom in on it.
$endgroup$
– StainlessSteelRat
55 mins ago
$begingroup$
As NMF says, you want to see an edge. Zoom in on it.
$endgroup$
– StainlessSteelRat
55 mins ago
1
1
$begingroup$
If you don't succeed on the first try, try again.
$endgroup$
– StainlessSteelRat
52 mins ago
$begingroup$
If you don't succeed on the first try, try again.
$endgroup$
– StainlessSteelRat
52 mins ago
1
1
$begingroup$
My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
$endgroup$
– Deniz
8 mins ago
$begingroup$
My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
$endgroup$
– Deniz
8 mins ago
|
show 9 more comments
2 Answers
2
active
oldest
votes
$begingroup$
First, "zoom in" to that rising edge by adjusting the time base. When you start getting close, you will start to see the rising slope of the signal.
As you do this, you'll need to capture new samples of that rising edge using the scope's triggering mechanism.
Once you can see the rising slope, capture a new sample. Any bouncing/overshoot/noise should become apparent.
answered 52 mins ago
bitsmackbitsmack
11.9k73677
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
24 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
6 mins ago
add a comment |
$begingroup$
Figure 1. The guys down at photo-forensics found this.
There are several factors:
- You have a nice new clean switch that bounces very little.
- Your scope is loading the circuit and the 15 pF is enough to help. This is unlikely, though, with what appears to be a resistor with a value in the hundreds of ohms. (The colour rendition of your photo is poor.)
- Timebase is too fast - but your comments say you've checked this.
I'd go with the first and second option.
answered 53 mins ago
TransistorTransistor
88.2k785189
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
$begingroup$
So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
$endgroup$
– Sunnyskyguy EE75
3 mins ago
add a comment |
Your Answer
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
First, "zoom in" to that rising edge by adjusting the time base. When you start getting close, you will start to see the rising slope of the signal.
As you do this, you'll need to capture new samples of that rising edge using the scope's triggering mechanism.
Once you can see the rising slope, capture a new sample. Any bouncing/overshoot/noise should become apparent.
answered 52 mins ago
bitsmackbitsmack
11.9k73677
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
24 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
6 mins ago
add a comment |
$begingroup$
First, "zoom in" to that rising edge by adjusting the time base. When you start getting close, you will start to see the rising slope of the signal.
As you do this, you'll need to capture new samples of that rising edge using the scope's triggering mechanism.
Once you can see the rising slope, capture a new sample. Any bouncing/overshoot/noise should become apparent.
answered 52 mins ago
bitsmackbitsmack
11.9k73677
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
24 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
6 mins ago
add a comment |
$begingroup$
First, "zoom in" to that rising edge by adjusting the time base. When you start getting close, you will start to see the rising slope of the signal.
As you do this, you'll need to capture new samples of that rising edge using the scope's triggering mechanism.
Once you can see the rising slope, capture a new sample. Any bouncing/overshoot/noise should become apparent.
answered 52 mins ago
bitsmackbitsmack
11.9k73677
$endgroup$
First, "zoom in" to that rising edge by adjusting the time base. When you start getting close, you will start to see the rising slope of the signal.
As you do this, you'll need to capture new samples of that rising edge using the scope's triggering mechanism.
Once you can see the rising slope, capture a new sample. Any bouncing/overshoot/noise should become apparent.
answered 52 mins ago
bitsmackbitsmack
11.9k73677
edited 13 mins ago
answered 52 mins ago
bitsmackbitsmack
11.9k73677
answered 52 mins ago
bitsmackbitsmack
11.9k73677
answered 52 mins ago
bitsmackbitsmack
11.9k73677
11.9k73677
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
24 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
6 mins ago
add a comment |
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
24 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
6 mins ago
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
1
1
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
24 mins ago
$begingroup$
If you zoom a stored waveform it may not have intermediate samples and just interpolate. You may see the edge sharper if you store a new sample at the higher timebase setting. As mentioned, good or new switches may have very little detectable bounce.
$endgroup$
– KalleMP
24 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
6 mins ago
$begingroup$
@Deniz no switch closure is going to result in a piecewise linear pulse -- that has to be a zoom-in of something sampled at a lower rate (probably 150$mu$s, because that's how long it's taking to rise up).
$endgroup$
– TimWescott
6 mins ago
add a comment |
$begingroup$
Figure 1. The guys down at photo-forensics found this.
There are several factors:
- You have a nice new clean switch that bounces very little.
- Your scope is loading the circuit and the 15 pF is enough to help. This is unlikely, though, with what appears to be a resistor with a value in the hundreds of ohms. (The colour rendition of your photo is poor.)
- Timebase is too fast - but your comments say you've checked this.
I'd go with the first and second option.
answered 53 mins ago
TransistorTransistor
88.2k785189
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
$begingroup$
So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
$endgroup$
– Sunnyskyguy EE75
3 mins ago
add a comment |
$begingroup$
Figure 1. The guys down at photo-forensics found this.
There are several factors:
- You have a nice new clean switch that bounces very little.
- Your scope is loading the circuit and the 15 pF is enough to help. This is unlikely, though, with what appears to be a resistor with a value in the hundreds of ohms. (The colour rendition of your photo is poor.)
- Timebase is too fast - but your comments say you've checked this.
I'd go with the first and second option.
answered 53 mins ago
TransistorTransistor
88.2k785189
$endgroup$
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
$begingroup$
So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
$endgroup$
– Sunnyskyguy EE75
3 mins ago
add a comment |
$begingroup$
Figure 1. The guys down at photo-forensics found this.
There are several factors:
- You have a nice new clean switch that bounces very little.
- Your scope is loading the circuit and the 15 pF is enough to help. This is unlikely, though, with what appears to be a resistor with a value in the hundreds of ohms. (The colour rendition of your photo is poor.)
- Timebase is too fast - but your comments say you've checked this.
I'd go with the first and second option.
answered 53 mins ago
TransistorTransistor
88.2k785189
$endgroup$
Figure 1. The guys down at photo-forensics found this.
There are several factors:
- You have a nice new clean switch that bounces very little.
- Your scope is loading the circuit and the 15 pF is enough to help. This is unlikely, though, with what appears to be a resistor with a value in the hundreds of ohms. (The colour rendition of your photo is poor.)
- Timebase is too fast - but your comments say you've checked this.
I'd go with the first and second option.
answered 53 mins ago
TransistorTransistor
88.2k785189
answered 53 mins ago
TransistorTransistor
88.2k785189
answered 53 mins ago
TransistorTransistor
88.2k785189
answered 53 mins ago
TransistorTransistor
88.2k785189
88.2k785189
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
$begingroup$
So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
$endgroup$
– Sunnyskyguy EE75
3 mins ago
add a comment |
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
$endgroup$
– Deniz
29 mins ago
$begingroup$
So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
$endgroup$
– Sunnyskyguy EE75
3 mins ago
$begingroup$
I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
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– Deniz
29 mins ago
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I have added 50uSec zoomed time scale photo. As you can see no bounce. I will also try to read button with a micro controller to see whether it is actually bouncing or not.
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– Deniz
29 mins ago
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So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
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– Sunnyskyguy EE75
3 mins ago
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So you think the 15pF is loading the 220 Ohms with a 3.3ns RC asymptote resulting in a 150us linear ramp? Ask the forensic guys to check again. My forensic guy said it smelt like 220 ohm i.stack.imgur.com/xEwUo.png
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– Sunnyskyguy EE75
3 mins ago
add a comment |
Deniz is a new contributor. Be nice, and check out our Code of Conduct.
Deniz is a new contributor. Be nice, and check out our Code of Conduct.
Deniz is a new contributor. Be nice, and check out our Code of Conduct.
Deniz is a new contributor. Be nice, and check out our Code of Conduct.
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6
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Have you tried adjusting the time base / horizontal scale?
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– NMF
57 mins ago
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Yeah, zoom in farther. Although, I must say that switches typically bounce for 1-10ms, and that should be visible on the OP's 50ms/div timescale. That's surprisingly clean switch.
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– Toor
55 mins ago
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As NMF says, you want to see an edge. Zoom in on it.
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– StainlessSteelRat
55 mins ago
1
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If you don't succeed on the first try, try again.
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– StainlessSteelRat
52 mins ago
1
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My zoomed photo is from another capture with battery instead of power supply. But as @pipe sait I have captured on zoomed out view and then zoomed on the rising edge after that. Now I understand that changing time scale before the capture and after the capture is different things? I didn't know that. I will need to figure out how to capture when time scale is set to uSec range.
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– Deniz
8 mins ago