Hi Ralph, thanks for pointing out the serial plotter. I didn't know it existed even though it's been in my tools the whole time! What a great feature. Had I known it was there I might not have purchased my Hantek a month ago. It is going to come in so handy for the project I'm currently working on. Thanks again for ALL your fantastic information and the work you do to educate us on Arduino tricks and projects. Hi to Benny also.
Benny is purring like a traction engine; he loves being mentioned in comments! And thanks for your kind words about my channel, I'm just happy you like the videos. Thanks for posting. Benny says it was purrfect!
Realise this is an old post but was wondering about the sw420 sensor. It appears to be based on the same sensor as in your post here. I was looking for a vibration sensor that I can mount under the front flange of a car differential housing to sense driveshaft vibration in rear wheel drive vehicle, however, I cannot see where this is particularly direction prone. My idea is to sense this vibration when it it either at the top of travel, i.e. the top of the diff housing , or at the bottom. Flash a timing light neon at this point so I can determine the vibration "high point". Monitor the flash via one of the elcheapo FPV camera/transmitters. Balance of the drive shaft could then be started using conventional means ( hose clamps) on the "low point" to minimise and eventually null the vibration. This essentally requires the sensor to have some "directional" characteristics. Not much info out there as far as I can muster and thought maybe you would have some idea. Cheers Jorgo Found your vibration sensor too....... www.learningaboutelectronics.com/Articles/Vibration-detector-circuit.php RS Components
I don't think I've heard of a _directional_ vibration sensor, but mounting two (or more) at various angles might achieve this. Wouldn't take long for a man of your talents to knock up a test rig. Sounds interesting, so good luck with your project Jorgo.
@@RalphBacon Thanks Ralph. With a little more digging I came across a module ADXL345 used with a prop balancer project over on RCgroups but they use a Teensy 3.2 which , over here at least, lightens ones pocket by at least $60-$70 before one gets started. The module itself can be had for a few dollars so will start and go from there with an Arduino Promini. Cheers Jorgo
Another great video. Thanks! At 26:54 you ask: "Why would you want someting that is so insentivie..." The first thing I thought about was a release-switch (trigger) for an airbag (in cars). And then I thought "No! Ralphs sensor is way too sensitive". :)
Ha Ha, the last thing you want is an air bag deployed when you don't need it! And something tells me my car doesn't have either an Arduino or one of this sensors in it! Alan Powell also commented on these sensors, which apparently are good at detected vibrations but not shocks - see his post above. I'll revisit this topic one day as I have new sensors to test.
Bit late to the party here, but OI think those "shake" switches are used for detecting whether fragile packages have been dropped (or chucked onto the back of a lorry) in transit.
Ralph, Got some of these. If you place it vertically on on a surface which actually vibrates, such as the top of a microwave or a food processor, the little spring starts to oscillate i.e sets up a pendulum like motion and accumulates energy to the point where it makes contact on most swings, detecting a vibration rater than a knock. . Probably need to average the readings to make anything sensible of it. There is another less sensitive version, a "knock Sensor", which responds to the more violent movements, such as a hammer tap. I've got some of those to make a "fall when hit" servo driven target for things like nerf projectiles. i.e. target falls when hit and picks itself up after a few seconds.
Ah ha, the plot thickens. So the "vibration sensor" responds to vibrations but not sharp knocks. I've actually had a few different knock/vibration sensors arrive lately, I shall have to experiment further. Thanks for the update Alan.
For anyone still wondering about the vibration sensor it probably makes a contact for a very short time, so if you poll the state of the pin, it is not likely that you check it at the exact moment it does contact. You have to use an interrupt to detect the vibration, or add something like a peak detector circuit. How stiff was that spring by the way? I want to know how small a vibration can it detect
It would be interesting to see whether this hypothesis is true, Luis. Although a vibration/tilt switch with such a short pulse is slightly less than useful. But if an interrupt works that would be good too.
@@RalphBacon Sure It would be very interesting to see how long the contact time is, if you have an oscilloscope it would make for an interesting video... The inside contact will bounce a lot and so it is very random and short pulses. People be careful though using interrupts as the interrupt is called for every rising or falling edge and if there is a lot of vibration there will be a lot of rising edges and it can take a lot of the CPU time.
That's the one, Paul! I'm pretty sure I didn't get it from Sparkfun but that memory is surely faded now anyway so you never know. Clones are probably available from our Far Eastern friends but it might be too niche a product to find anywhere else. Thanks for posting, I'm sure others will also find this link very useful.
+Ralph S Bacon : Yes it was the _springy_ one. It was in the so called "40 sensor" pack, listed as a "klopf" sensor (For som reason I got a German version)
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Hi Ralph, thanks for pointing out the serial plotter. I didn't know it existed even though it's been in my tools the whole time! What a great feature. Had I known it was there I might not have purchased my Hantek a month ago. It is going to come in so handy for the project I'm currently working on. Thanks again for ALL your fantastic information and the work you do to educate us on Arduino tricks and projects. Hi to Benny also.
Benny is purring like a traction engine; he loves being mentioned in comments! And thanks for your kind words about my channel, I'm just happy you like the videos. Thanks for posting. Benny says it was purrfect!
I had no idea about the Serial Plotter or even knew it was there, Thanks, Benny steals the show, Nice...
Yes, it was Benny who alerted me to this new feature, he'd apparently been plotting the frequency distribution of mice across the floor...
Realise this is an old post but was wondering about the sw420 sensor. It appears to be based on the same sensor as in your post here. I was looking for a vibration sensor that I can mount under the front flange of a car differential housing to sense driveshaft vibration in rear wheel drive vehicle, however, I cannot see where this is particularly direction prone. My idea is to sense this vibration when it it either at the top of travel, i.e. the top of the diff housing , or at the bottom. Flash a timing light neon at this point so I can determine the vibration "high point". Monitor the flash via one of the elcheapo FPV camera/transmitters. Balance of the drive shaft could then be started using conventional means ( hose clamps) on the "low point" to minimise and eventually null the vibration.
This essentally requires the sensor to have some "directional" characteristics. Not much info out there as far as I can muster and thought maybe you would have some idea. Cheers Jorgo
Found your vibration sensor too....... www.learningaboutelectronics.com/Articles/Vibration-detector-circuit.php RS Components
I don't think I've heard of a _directional_ vibration sensor, but mounting two (or more) at various angles might achieve this. Wouldn't take long for a man of your talents to knock up a test rig. Sounds interesting, so good luck with your project Jorgo.
@@RalphBacon Thanks Ralph. With a little more digging I came across a module ADXL345 used with a prop balancer project over on RCgroups but they use a Teensy 3.2 which , over here at least, lightens ones pocket by at least $60-$70 before one gets started. The module itself can be had for a few dollars so will start and go from there with an Arduino Promini. Cheers Jorgo
Another great video. Thanks!
At 26:54 you ask: "Why would you want someting that is so insentivie..."
The first thing I thought about was a release-switch (trigger) for an airbag (in cars). And then I thought "No! Ralphs sensor is way too sensitive". :)
Ha Ha, the last thing you want is an air bag deployed when you don't need it! And something tells me my car doesn't have either an Arduino or one of this sensors in it! Alan Powell also commented on these sensors, which apparently are good at detected vibrations but not shocks - see his post above. I'll revisit this topic one day as I have new sensors to test.
Bit late to the party here, but OI think those "shake" switches are used for detecting whether fragile packages have been dropped (or chucked onto the back of a lorry) in transit.
You mean couriers don't gently place each parcel with loving care into the back of a DHL/ParcelFarce/Post Office/Yodel van? I'm shocked.
Ralph, Got some of these. If you place it vertically on on a surface which actually vibrates, such as the top of a microwave or a food processor, the little spring starts to oscillate i.e sets up a pendulum like motion and accumulates energy to the point where it makes contact on most swings, detecting a vibration rater than a knock. . Probably need to average the readings to make anything sensible of it. There is another less sensitive version, a "knock Sensor", which responds to the more violent movements, such as a hammer tap. I've got some of those to make a "fall when hit" servo driven target for things like nerf projectiles. i.e. target falls when hit and picks itself up after a few seconds.
Ah ha, the plot thickens. So the "vibration sensor" responds to vibrations but not sharp knocks. I've actually had a few different knock/vibration sensors arrive lately, I shall have to experiment further. Thanks for the update Alan.
Merry Christmas Ralph to you and yours and all the very best for 2017.
I hope you had a good one Nick, and here's to an even brighter 2017!
For anyone still wondering about the vibration sensor it probably makes a contact for a very short time, so if you poll the state of the pin, it is not likely that you check it at the exact moment it does contact.
You have to use an interrupt to detect the vibration, or add something like a peak detector circuit.
How stiff was that spring by the way? I want to know how small a vibration can it detect
It would be interesting to see whether this hypothesis is true, Luis. Although a vibration/tilt switch with such a short pulse is slightly less than useful. But if an interrupt works that would be good too.
@@RalphBacon Sure It would be very interesting to see how long the contact time is, if you have an oscilloscope it would make for an interesting video...
The inside contact will bounce a lot and so it is very random and short pulses.
People be careful though using interrupts as the interrupt is called for every rising or falling edge and if there is a lot of vibration there will be a lot of rising edges and it can take a lot of the CPU time.
His code works fine, and it "only" reads the pin.
Here is the vibration sensor you used with the brass eye. www.sparkfun.com/products/9198
That's the one, Paul! I'm pretty sure I didn't get it from Sparkfun but that memory is surely faded now anyway so you never know. Clones are probably available from our Far Eastern friends but it might be too niche a product to find anywhere else. Thanks for posting, I'm sure others will also find this link very useful.
I use the last sensor you demonstrated as a _knock_ sensor for snoozing my alarm clock. One knock for snooze two for off.
Which sensor was that Zeedijk? The vibration sensor? Sounds like an original implementation. Nice idea.
+Ralph S Bacon : Yes it was the _springy_ one. It was in the so called "40 sensor" pack, listed as a "klopf" sensor (For som reason I got a German version)
Thanks for sharing this👍😀
Glad you liked this video too Asger, and thanks for posting here, appreciated.
a 1 meg ohm resistor is bigger than a 100k
In value, certainly, in size, not at all. I don't know what reference this is to Eric, got a time code in the video?
@@RalphBacon 9:03 - 9:05