A simplified explanation of how a capacitive MEMS accelerometer works. Website: www.afrotechmods.com/ Accelerometer math: www2.usfirst.org/2005comp/Manu...
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Great job covering some prime electronics topics that hobbyists and engineers are commonly looking up! I love the channel; everything you say is well thought out.
I found you after looking up some scientific glassblowing videos, and I have to say this is one of the best channels on RU-vid. I wish my recommendations had videos like this instead of Vevo and Veritasium.
You set me straight, as I thought they had something like an Inclinometer or an encoder that has a small weight on it. PS: Another great video, can't wait for the next one.
keep up the great videos, your videos help me so much, and i have relied on them to understand quite a bit of what i currently know about electronics, hope i can be as successful one day.
What I wonder with these micosystems is HOW do they actually move? Are they suspended in some medium? Where are the fulcrim points? And how long is the mean time between failure? Will my car with 100,000 miles hav .one fail and wrap me in my big Pie Hole someday? Can you do a.video on barometric swotches also, and others on these most interesting devices? Do.these qualify aa nanomachines?
Some animation would help the viewers tremendously in visualizing and understanding what you are talking about. I, for one, are still not quite understanding what you are trying to convey.
Change in distance between closely spaced conductors will alter the capacitance between the conductors. Look at the comb structure just as two plates for simplicity. the two plates are separated by an air gap dictated by the manufacturing process. At any rate it is a very small gap. Due to inertia ( things wanting to stay at the same speed they are currently going)when the system moves the weight wants to stay in its current state more than the thin plate(s) it is attached to so in doing so it bends the plate ( or comb) it is attached to creating a difference in capacitance which is sensed electronically.Is this helpful?
Great video! I've read that acclerometers are very noisy and should only be used for steady-state tilt information only, even though they are often rated to measure 10khz. Is this true? Is a gyro the only way to get accurate real-time acceleration data? A video suggestion : the mechanism behind gyros and the practical difference in the data produced vs accerometers!
You can use an accelerometer to measure acceleration just fine. However one problem that some people encounter is trying to integrate acceleration to get velocity or position data, and in those scenarios accelerometer error does accumulate very quickly, so people tend to combine data with gyro & gps.
This was a long time ago, in a galaxy far far away. The technique is called photolithography and here is a good primer: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-1bxf9QRVesQ.html
+MrPolymath0 There'are a lot of phases as following: - Chemical Vapor Depositation ( at low pressures and high temperatures) o Epitaxial Growth - Etching of silicon parts in order to achieve the correct mass for the wanted resonance frequency ( taking into account non idealities due to under/over etching) --> Dry etching or wet etching - Dioxide Silicon Elimination using acids like HF. So in this way, it's possible to correctly obtain a moving mass which will be the inertial mass for the inertial forces detection. -Packaging ( at low pressure, obviously depending on requirements and budget), by means glass frit or eutectic bonding. etc etc. It may seem easy but it's far from it.
Strange. For some reason in my mind I always imagined tiny ball bearings in channels with contact points on the the sides and ass the ball rolled past it would tell the device which way it was tilting. I guess it wouldn't be able to detect how many g-forces are being applied though.
Hey Afrotechmods plz do a video that tells the difference between current and voltage... Most of the people in real life doesn't differ between them.. I also do have a little idea about it...
shubham saxena You can think of electricity like a river flowing downhill. The current is the cross sectional area of the river, so is the amount of water flowing at any given time. The voltage (also known as potential difference) is the difference in height of the river, so it is the amount of 'pushing force' behind the river's movement. To sum it up, the current is the amount of electrons moving while the voltage is the amount of force that is 'pushing' the electrons.
Is there a way to avoid (physical) oscillations in such circuits? Is it damped out somehow? It might be fun to try to make a more macro size one with little magnets on plastic tabs with hall effect sensors.
Since the structures are so small their resonant frequency (and hence oscillations) are very high in frequency, and your measurements would be lower than the resonant frequency. If you do hit resonance, it can destroy the accelerometer though, depending on the model. Some may have a 'hard stop' which prevents excessive deflection at resonance, and prevents damage from mechanical shock (i.e. 8 g accelerometers that can survive a 10,000 g shock)
interesting! How hard do you have to shake an accelerometer for the capacitor plates to touch each other and create a short (possibly destroying the IC)?
Afrotechmods thanks for the swift reply, I'm sure you could have mentioned other vendors, it just seemed a teeny bit suspicous, with all the stuff going on and all, sorry for the nagging, fun video! :)
Adafruit is the boss! Why would product placement be bad? Would that somehow reduce afrotechmods integrity? How is getting paid for hard work bad? Do you do all your work for free? I HOPE Adafruit pays him for product placement, so he has more incentive to make rediculamously fantawesomic videos!
Im trying to make a device to help my friend walk straight by sending alerts if slightly deviated (right or left). Would Gyroscope or accelerometer or gyroscope work? I need suggestions. Thank You
It's not the sensor , but the electronics and software that reads it that causes the delay. The data from the sensor is converted to digital data. Then it goes through software calculations to determine the angle , speed .. This causes a delay.
Hi I have a doubt what happens to output of accelerometer when accelerometer is moved with same speed for some time will it be zeros or some constant km/s^2
i guess that the reason is because some devices only have data lines with 3.3v volts like the Rpi, if you used 5v you will end up frying the gpio or the processor of the pi
Dudes always be like "Damn imagine if aliens came to earth and saw our technology they'd think we're cavemen" when likely they're just gonna be better suited for space travel than humans and the second they look at our technology they're gonna think "holy shit these dudes are fucking cracked"
Afrotechmods CQ(seekyou?) would be more appropriate for an intro , QRT( basically the end of transmission) for the exit. BTW i watched enineeringuy's video on the topic last week, you both explainit well, but you had the die to show us
Great video (as always). But I except it to be a little longer. What about making a second part explaining MEMS gyroscope, magnometer, ... (9 dof) and how to use them together to retrieve stable and precise orientation (kalman filter, high/low pass filters...). No need to go in math detail, just to mention it.
The gyroscope uses the Coriolis effect combined with vibrating matrices at each axis. Basically the vibrations tend to stay in the same plane as the supporting structure of the proof mass. IIRC they still use changing capacitance but its the error of the vibrations which is really measured as this would indicated rotation about that axis.
That's just an electrical motor with an off-centre mass, like a tiny version of a washing machine with a heavy load, as it spins it shakes. Cellphones have ones that are even tinier still, hard to even recognise them as motors.
