|
it could be dramatically worse. I did all of my breadboards in school as ratsnests, using one length of wire nearly exclusively
|
#
?
Feb 9, 2017 17:39
|
|
|
|
| # ? May 16, 2024 05:15 |
|
|
http://a.co/aMcRTWv I "discovered" jumper wire kits in college after cutting my own for years and would never, ever go back to anything else.
|
|
#
?
Feb 9, 2017 20:15
|
|
|
meatpotato posted:http://a.co/aMcRTWv i'm using pretty much that yeah. does mean that my +3.3 and ground don't have red and black though!
|
|
#
?
Feb 9, 2017 20:31
|
|
|
I credit these vids which are just insanely good https://www.youtube.com/watch?v=g_1HyxBzjl0&hd=1
|
|
#
?
Feb 9, 2017 20:32
|
|
|
the real problem is sensors with wires already attached and having wire to bare pads and the like
|
|
#
?
Feb 9, 2017 23:00
|
|
|
hobbesmaster posted:the real problem is sensors with wires already attached and having wire to bare pads and the like i accidentally bought this:  It's roughly 1cm a side. after looking for a socket that'll fit it, in the end i just bought a second that comes attached to a pcb. for £90. my only justification is eventually i'll need three if i follow through with this project
|
|
#
?
Feb 9, 2017 23:12
|
|
|
gonadic io posted:i accidentally bought this: just dead bug it 
|
|
#
?
Feb 9, 2017 23:26
|
|
|
inertial MEMS sensors are designed to go into cellphones, there is no market for any chip package other than "as small as possible" dev and eval kits do tend to be pretty expensive (and they're still sold at a loss considering the amount of NRE that goes into them) but the chips themselves are manufactured in huge volumes so they shouldnt cost more than like $10 off digikey for the really fancy ones my research masters project was a cool distributed wireless motion capture algorithm built for a radio network of these things worn on the body. it was quite the baptism of fire for learning embedded development.
|
|
#
?
Feb 9, 2017 23:27
|
|
|
also the sensitivity of those things is incredible. when i finished doing hw bring-up on the PCB that had been designed for me to implement the project on, I pumped the raw data stream over the on-board radio, wrote an OpenGL attitude visualization, cased up the battery powered PCB (it was slightly smaller than a matchbox) and dropped it onto my desk from 1ft in the air The cased-up PCB hit the desk and wobbled to a rest and the wobbles were precisely rendered in real time on the screen. It was amazing to see. MEMS gyroscope precision is out of this world.
|
|
#
?
Feb 9, 2017 23:32
|
|
|
they're incredibly noisy unless you got some crazy expensive aviation ones though
|
|
#
?
Feb 9, 2017 23:36
|
|
|
gonadic io posted:i accidentally bought this: At least you can still solder those with an iron.
|
|
#
?
Feb 9, 2017 23:38
|
|
|
spankmeister posted:At least you can still solder those with an iron. 
|
|
#
?
Feb 9, 2017 23:44
|
|
|
Spatial posted:yeah if you're this guy hey man, better than accidentally buying a bga
|
|
#
?
Feb 10, 2017 01:16
|
|
|
QFNs suck to hand-solder but they could be worse
|
|
#
?
Feb 10, 2017 01:29
|
|
|
I actually did this, although in an unorthodox way while assembling those pcbs didn't use solder paste, instead i used a needle to put solder balls next to each pad then blasted the whole thing with a heat gun yeah idkwtf i was just told to do it that way.
|
|
#
?
Feb 10, 2017 01:39
|
|
|
PSA: if a data sheet has "DRAFT" as the background for every page and SUBJECT TO CHANGE as the footer do not do a board layout based on the pinouts
|
|
#
?
Feb 10, 2017 22:39
|
|
|
hobbesmaster posted:PSA: if a data sheet has "DRAFT" as the background for every page and SUBJECT TO CHANGE as the footer do not do a board layout based on the pinouts that seems like pretty solid advice
|
|
#
?
Feb 11, 2017 01:44
|
|
|
  crazy bastard posted:My project involves interfacing an AMD Radeon HD 2400 graphics card with a STM32 Discovery evaluation board. Using AMD's publicly available documentation together with MMIO traces of the proprietary Catalyst driver I have managed to upload and execute code on the GPU's internal hardware video decoder which features a Tensilica Xtensa 32-bit CPU. the dream of the single-board computer has finally come true running an RTOS on the video codec to control the gpu
|
|
#
?
Feb 12, 2017 22:39
|
|
|
my goodness
|
|
#
?
Feb 13, 2017 00:13
|
|
|
holy poo poo, bad rear end
|
|
#
?
Feb 13, 2017 01:38
|
|
|
is that card powered by backfeeding the unused fan header?
|
|
#
?
Feb 13, 2017 06:52
|
|
|
DJ Commie posted:is that card powered by backfeeding the unused fan header? I thought it was the debug connector going to the breadboard but I think you may be right 
|
|
#
?
Feb 13, 2017 06:57
|
|
|
hobbesmaster posted:I thought it was the debug connector going to the breadboard but I think you may be right i see some other breaking out from there, i assume they sneaking power elsewhere to power things not to diminish how crazy of an idea it was
|
|
#
?
Feb 13, 2017 07:16
|
|
|
DJ Commie posted:i see some other breaking out from there, i assume they sneaking power elsewhere to power things In one of the Flickr sets he confirms that yes, it is powered via fan header.
|
|
#
?
Feb 13, 2017 08:23
|
|
|
Jesus Christ
|
|
#
?
Feb 13, 2017 14:56
|
|
|
i had a productive lunch today  i guess im officially now a terrible bit janitor https://www.youtube.com/watch?v=S8MtqhWVQ2E&hd=1 this is in C in the arduino IDE, time for another attempt at replicating rust next i think
|
|
#
?
Feb 14, 2017 14:34
|
|
|
Pro tips from an actual IC designer: If you don't have many registers, you can make I2C registers hold 9 bits! Just use the least significant of the register address as the 9th bit of the data, and let people multiply the listed address by 2. It's totally intuitive and people will love you for it! Don't waste time with pesky logic that lets you write back onto the I2C bus. Users only want to set registers and won't ever want to read them back. Think of all the silicon you'll save! 
|
|
#
?
Feb 14, 2017 21:54
|
|
|
so I wanna figure out how to strap an ESP8266 onto the back of a cheap 3" solar panel - any recommendations for dirt-cheap solutions for boost converter circuitry/ICs? Linear technology's got a very nice module but it's $6 apiece and my goal is to be as comedy-cheap as possible on these things as possible
|
|
#
?
Feb 15, 2017 09:07
|
|
|
Buy a board off aliexpress. 
|
|
#
?
Feb 15, 2017 09:10
|
|
|
hobbesmaster posted:PSA: if a data sheet has "DRAFT" as the background for every page and SUBJECT TO CHANGE as the footer do not do a board layout based on the pinouts 
|
|
#
?
Feb 15, 2017 11:09
|
|
|
ah so that's what they're reserved for
|
|
#
?
Feb 15, 2017 12:33
|
|
|
hobbesmaster posted:they're incredibly noisy unless you got some crazy expensive aviation ones though gyros are fine (but subject to bias), it's the accelerometers that are noisy
|
|
#
?
Feb 15, 2017 18:00
|
|
|
fritz posted:gyros are fine (but subject to bias), it's the accelerometers that are noisy  gently caress 2mm pitch pins. Also what are we counting as "crazy expensive aviation" ones? These are £90 each,and I am eventually planning on using them in aviation. gonadic io fucked around with this message at 18:49 on Feb 15, 2017 |
|
#
?
Feb 15, 2017 18:35
|
|
|
Jimmy Carter posted:so I wanna figure out how to strap an ESP8266 onto the back of a cheap 3" solar panel - any recommendations for dirt-cheap solutions for boost converter circuitry/ICs? Linear technology's got a very nice module but it's $6 apiece and my goal is to be as comedy-cheap as possible on these things as possible It might be cheaper to hook smaller panels in series than to find a boost module that can go from 0.5 V to 3V.
|
|
#
?
Feb 15, 2017 18:40
|
|
|
please do not crash your plane, forums poster gonadic io
|
|
#
?
Feb 17, 2017 22:17
|
|
|
Silver Alicorn posted:please do not crash your plane, forums poster gonadic io plane?  https://github.com/djmcgill/to-the-moon
|
|
#
?
Feb 17, 2017 23:25
|
|
|
gonadic io posted:Also what are we counting as "crazy expensive aviation" ones? These are £90 each,and I am eventually planning on using them in aviation. like i would've started with a MPU6050 and upgraded after bench tests showed it to be too noisy e: the first MPU6050 i bought was in huaquiangbei, i wrote "9 DOF IMU" and showed it to the nice lady in one of the SEG booths, she shook her head and wrote 6 and spent a while trying to translate DoF, i paid like $0.50
|
|
#
?
Feb 17, 2017 23:35
|
|
|
side note, drone teardown are disappointing like i'm expecting part #'s and most are happy to pull a ESC and correctly identify it
|
|
#
?
Feb 17, 2017 23:38
|
|
|
JawnV6 posted:how'd you even find that $70 gyro? it's the latest model of the one used by this guy: https://www.aeroconsystems.com/tips/Active_Stabilized_rocket_Wyatt.pdf i got the same solenoid valves too.
|
|
#
?
Feb 17, 2017 23:45
|
|
|
|
| # ? May 16, 2024 05:15 |
|
|
idk, one of the trends since 2007 is that any component common to cell phones (gyros included) has plummeted in price. you might be able to find a good-enough part for much cheaper now one of the parts of embedded I find really fun is starting from physical problems and dimensional analyzing all the way to bits like let's say i'm working with a boiler. i have a thermistor (temp-sensitive resistor) inside it and the FW needs to know the temperature to within 0.5 degrees C. there's a chain from "0.5 deg C -> thermistor resistance delta -> voltage delta -> ADC input -> bits" and if the lowest bit tells me less than the degrees I need, the FW can't possibly meet the product spec. i was in a schematic review where the EE showed his plan to lop off half the usable voltage delta, i had to argue for a re-design im not sure how to set your problem up, but i'd imagine it's measuring degrees off the vertical. "if i'm over 2 degrees the wrong way, fire the solenoid" is the problem statement? forget about time for now, how precise do you need the degree measurement to be?
|
|
#
?
Feb 18, 2017 00:55
|
|