a thread about janitoring individual bits and using oscilloscopes and stuff

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > YOSPOS > a thread about janitoring individual bits and using oscilloscopes and stuff

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gonadic io: Feb 16, 2011; >>=

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

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# ¿ May 16, 2024 21:24

gonadic io: Feb 16, 2011; >>=

i had a productive lunch today :toot:

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

gonadic io: Feb 16, 2011; >>=

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

gonadic io: Feb 16, 2011; >>=

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: Feb 16, 2011; >>=

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

gonadic io: Feb 16, 2011; >>=

JawnV6 posted:

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?

p much yeah, and i have no idea :v:

i'm just copying that paper mostly. once i have anything working, in about 10 years, i'll look to lower the price.

# ¿ Feb 18, 2017 08:24

gonadic io: Feb 16, 2011; >>=

https://www.arduino.cc/en/Tutorial/Potentiometer

why this tutorial say to connect 1 pin with ground, one with the board, and then 1 to +V?

surely the same effect is achieved with enabling the internal pullup resistor, then connecting it to the middle pin then connecting ground to either of the side ones?

# ¿ Feb 19, 2017 15:33

gonadic io: Feb 16, 2011; >>=

Sweevo posted:

if you connect both ends of the potentiometer to ground then the mid point will always be ground regardless of where you turn it.

i get that, what i'm asking is the diff between

code:

     pin
      |
0V ---|-- 5V

and

code:

  pulledup pin (+5V)
      |
0V ---|--- (disconnected)

# ¿ Feb 19, 2017 16:26

gonadic io: Feb 16, 2011; >>=

Bloody posted:

the goal is to use the pot as a voltage divider presumably. if you just pull up the middle of the pot you have... something. not a voltage divider. well at least not a useful voltage divider

i see, it goes between 0 and 5 with all three pins connected.

with just the middle you have something that goes between x and y where 0 < x < y < 5 and they both depend on the exact resistors involved

# ¿ Feb 19, 2017 17:08

gonadic io: Feb 16, 2011; >>=

Bah, still having issues with Rust and my Arduino. Anybody want to weigh in? http://stackoverflow.com/questions/42368675/why-does-getting-the-address-of-certain-linker-variables-halt-samd21-execution-i

Honestly at this point I'm not far off just creating a dynamic library in Rust and doing the setup in C to call the Rust library.

# ¿ Feb 21, 2017 15:31

gonadic io: Feb 16, 2011; >>=

hmm, this doesn't look good

code:

0000247c <__etext-0x68>:
    247c:	7ffffc38 	svcvc	0x00fffc38
    2480:	80978408 	addshi	r8, r7, r8, lsl #8
    2484:	7ffffca0 	svcvc	0x00fffca0
...
    24c4:	7ffffec0 	svcvc	0x00fffec0
    24c8:	8000b0b0 	strhhi	fp, [r0], -r0
    24cc:	7ffffec0 	svcvc	0x00fffec0
    24d0:	800ba8b0 			; <UNDEFINED> instruction: 0x800ba8b0
    24d4:	7ffffeec 	svcvc	0x00fffeec
    24d8:	8006abb0 			; <UNDEFINED> instruction: 0x8006abb0
    24dc:	7fffff14 	svcvc	0x00ffff14
    24e0:	00000001 	andeq	r0, r0, r1

# ¿ Feb 22, 2017 00:50

gonadic io: Feb 16, 2011; >>=

dumb noob question

if i only have a 24V battery, and i use some DC/DC regulator to get it to 3.3

can i have

pre:

+24V ----- motor --|
       |           |
     DC/DC         |
       | (+3.3V)   |
     arduino       |
       |           |
 +0v --------------|

i.e. i don't need to protect the arduino from the ground rail, 0 is 0? the motor will have a rectifier diode to prevent kickback.

# ¿ Feb 22, 2017 18:23

gonadic io: Feb 16, 2011; >>=

i mean i'll probably have to step up to 24 instead of stepping down to 3.3 but the question is still relevant

# ¿ Feb 22, 2017 18:25

gonadic io: Feb 16, 2011; >>=

triple post project update:

i got digitial pio working in rust so my single-digit-button-counter
https://www.youtube.com/watch?v=S8MtqhWVQ2E&hd=1
is now implemented entirely in rust with a little bash script to compile and upload!

it's not especially good code, and i still can't get the address of __etext, but i'm pretty pleased that it's working

# ¿ Feb 22, 2017 21:46

gonadic io: Feb 16, 2011; >>=

yippee cahier posted:

0 is 0, yeah. some people might still warn you about noise from the motor, idk.

do you want to control the motor using the arduino? i used https://www.sparkfun.com/products/10213 to control a higher voltage DC motor from a 3.3V arduino.

yeah i have a bunch of those, currently i'm blinking an led with one but the plan is to control motors/solenoid valves with them

# ¿ Feb 22, 2017 21:54

gonadic io: Feb 16, 2011; >>=

atomicthumbs posted:

it's all fun and games until your inductive load starts ringin', flips that pulse around, and rams it backwards through your switching bank and capacitor

got myself some rectifier diodes to put across the motors and solenoid valves

# ¿ Feb 23, 2017 12:54

gonadic io: Feb 16, 2011; >>=

Zero:

quote:

The board can operate on an external supply of 6 to 20 volts. The recommended range is 7 to 12 volts.

MKRZero:

quote:

Vin
This pin can be used to power the board with a regulated 5V source. If the power is fed through this pin, the USB power source is disconnected. This is the only way you can supply 5v (range is 5V to maximum 6V) to the board not using USB. This pin is an INPUT.

# ¿ Feb 24, 2017 07:52

gonadic io: Feb 16, 2011; >>=

Got my Arduino's ADC working in Rust! i'm p happy not going to lie

code:

const VAR_RES: Port = A2;
const ADC: *mut ADC = 0x42004000 as *mut ADC;

pub fn main() {
    unsafe {
        VAR_RES.set_pin_dir(false);
        let mut digit = create_eight_segment!(D7, D6, D3, D4, D5, D8, D9, D2);

        loop {
            let s = (*ADC).analog_read(VAR_RES) as u32;        
            digit.display( s >> 7 );
            delay(100);
        }
    }
}

https://www.youtube.com/watch?v=rE2VUSBSRB8

gonadic io fucked around with this message at 14:06 on Apr 4, 2017

# ¿ Apr 4, 2017 13:54

gonadic io: Feb 16, 2011; >>=

Sagebrush posted:

i know i keep spamming this thread but i am finding this stuff p cool

fwiw i'm also finding your stuff really cool. especially since my rust arduino project has kinda stalled

# ¿ May 27, 2017 08:29

gonadic io: Feb 16, 2011; >>=

Bloody posted:

caps are full of lies and are trash

ACAB

# ¿ Jun 4, 2017 18:57

gonadic io: Feb 16, 2011; >>=

what use case does logical shift have except trying to out-optimise the compiler when multiplying/dividing by powers of 2?

# ¿ Jul 21, 2017 14:57

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# ¿ May 16, 2024 21:24

gonadic io: Feb 16, 2011; >>=

Wait poo poo I got them the wrong way around. I'm all for bitshifting, I guess I meant arithmetic shift

# ¿ Jul 21, 2017 15:49

The Something Awful Forums > Discussion > Serious Hardware/Software Crap > YOSPOS > a thread about janitoring individual bits and using oscilloscopes and stuff

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