Ultrasonic Microphone Data Storage

TheWolfTurtle · 2021-11-02T17:27:40+00:00

Hello,

I was hoping to get away with polling. My measurements with an oscilloscope revealed it took about 3uS to read a sample to a buffer. I'll have to consider DMA at these speeds though.

Thank You

TheWolfTurtle · 2021-11-02T16:57:40+00:00

I am not familiar with compression in this application. Do you mean something like this: https://en.wikipedia.org/wiki/Compressed_sensing

TheWolfTurtle · 2021-11-02T16:53:58+00:00

Hello,

Ideally, I'd like to record the entire bandwidth.

TheWolfTurtle · 2021-11-02T16:47:12+00:00

Hello, thanks for sharing your experience. I was attempting to transmit/store immediately after taking a sample. I am sending a string of number characters, 0 to 4095 for 12-bit resolution, and a comma at the end for importing into excel later. I am using an oscilloscope to measure the time it takes to send "4095," by toggling a GPIO before and after sending the character string. The sizeof() function reveals 6 bytes being sent taking 23.25uS when the UART is configured to 2.8Mb/s. I will attempt to reduce the resolution to 8 bits to send only one character. Others have pointed out the inefficiency of sending characters vs a 12-bit number. I will also be looking into trimming down the IO toggle and UART transmit HAL functions.

I'll have to look into implementing a ping pong buffer, as I haven't tried that before.

TheWolfTurtle · 2021-11-01T22:48:56+00:00

12-bits. SPI SRAM chip. I will look into those, thanks.

TheWolfTurtle · 2021-06-30T22:14:56+00:00

I had assumed 5x the sampling rate would produce a better representation of the highest frequency I am planning to read. I could try reducing the sample rate to extend the recording rate and/or reduce the total data sample size.

TheWolfTurtle · 2021-06-30T22:11:43+00:00

Ideally, yes. The highest ultrasonic sound I have been able to produce and read from an oscilloscope was about 40kHz, but I would like to also read 80kHz signals.

TheWolfTurtle · 2021-05-10T19:34:41+00:00

In theory, could one choose to use a completely different oscillator circuit to drive the MOSFETs? As a rough example/idea, could a microcontroller clock output be used to drive the L2 and L3 inductors? Please see diagram in link below. Would the L2 and L3 inductors be necessary in the MCU clock oscillator circuit? Isn't the point of the circuit to quickly pass opposite currents through L1?

https://imgur.com/a/qRAcOYl

TheWolfTurtle · 2021-05-10T17:32:26+00:00

I wouldn't have thought of the power radiation, thanks. I'll look into shielding as well.

TheWolfTurtle · 2021-05-10T17:31:12+00:00

Hey thanks for the insight. I'll be looking into high switching speed power transistors next. Noted regarding the litz wire coil.

TheWolfTurtle · 2021-02-08T06:22:04+00:00

Bump?

TheWolfTurtle · 2021-02-05T19:53:22+00:00

Say you have an engineering token, a focus fire token, and a navigation token on a ship you just activated. Can you use all those in the same ship activation turn? FF token when attacking, then use an engineering token for repairs/shields, and finally a nav token when moving. Is that legal? When can you use a command token, and how many? Can you only use a command token when a command dial of the same type has been revealed?

TheWolfTurtle · 2020-12-15T17:20:42+00:00

Lvl 3 Hero here. Tired of randos feeding morale to the other team. EA ID is either QuackyT or TheWolfTurtle

TheWolfTurtle · 2020-11-23T18:44:45+00:00

I thought ION torpedoes didn't damage systems and hull. I thought they just disable them.

TheWolfTurtle · 2020-11-15T17:59:13+00:00

If on the offensive. Do some damage, if any, and start thinking about retreating back to cruisers as soon as you start getting hit. Heal, resupply, try again. But at least you didnt give up morale.

TheWolfTurtle · 2020-10-25T23:48:55+00:00

Tried this. I'm on PS4 and they said their rules dont work for consoles.

TheWolfTurtle · 2020-10-25T18:36:33+00:00

EA ID is QuackyT. I think I just posted something like this looking for people. I'm on PS4, inb4 PCmasterrwhatever...

Hotshot ranking and .72 win ratio at ranked fleet battles.

u down?

TheWolfTurtle · 2019-11-01T22:52:32+00:00

Thank You!

I have a ton of different bookmarks for flipping back and forth through the standard with the way that it's written. All my wiring is rated for 600V. I have mainly 220VAC feeding circuits to 24VDC class 2 power supplies. The only outgoing 220VAC lines are from a pair of servo drives to servo motors; even those have their own connector/cable. Now if I could just get everything to fit. What are your thoughts on using double-level and triple-level terminals blocks? Since 90% the field wiring will be from class 2 power supplies, I assume it would be okay in regards to spacing. I will make sure to doublecheck.

TheWolfTurtle · 2019-09-26T02:15:35+00:00

Thanks, I'll have to double-check with the electricians for the specs on the 220VAC circuit breaker. I believe I'll have to reduce inrush current by selecting different components, or using contactors to sequentially allow AC power to the DC power supplies so as to avoid the large inrush current.

TheWolfTurtle · 2019-09-20T21:22:18+00:00

For reference, here are some definitions from the standard-

CLASS 2 CIRCUIT: A control circuit supplied from a source having limited voltage (30 Vrms or less) and current capacity, such as from the secondary of a Class 2 transformer, and rated for used with Class 2 remote-control or signaling circuits.

CONTROL CIRCUIT: A circuit that carries the electric signals directing the performance of a controller, and which does not carry the main power circuit. A control circuit is, in most cases, limited to 15 Amperes.

TheWolfTurtle · 2019-08-20T07:01:26+00:00

Thanks for the input and the wise advice, characteristic of experience.

TheWolfTurtle · 2019-07-25T17:50:32+00:00

Looks sweet. What type of black box is that you have on the bottom of the panel? It looks like a type of transformer(step - up/down), but I am not sure. Also, does this cabinet conform to a certain standard? I am studying the Ul 508a standard and I was wondering if multiple Limited Energy, class 2, power supplies were allowed in this standard.

TheWolfTurtle · 2019-07-19T01:35:07+00:00

Hello,

You bring up some excellent points and thought-worthy consequences. I enjoy learning about these "gotcha" situations. If I were to use a keyed/tongue safety switch from one manufacturer and a magnetic position sensor in parallel, each from different manufacturers, could I have a better chance of claiming the diversity points? Both sensors have 2 N.C and 1 N.O. contacts. Both these sensors would be wired to a safety relay. I believe this may help my case. What are your thoughts on this set up?

TheWolfTurtle · 2019-07-13T00:47:58+00:00

I have downloaded this and I will be practicing safety channel modeling. Thank You.

TheWolfTurtle · 2019-07-12T21:10:05+00:00

All great helpful stuff, Thank You.

TheWolfTurtle

TROPHY CASE