Rue Mohr @RueNahcMohr Twitter profile | Pikagi

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Rue Mohr

@RueNahcMohr

9,222

Followers

123

Following

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Statuses

1 Techie. Electronics, Programming, Mechanical. I do it for fun, but I walk a lonely road.

Gibsons, British Columbia

https://t.co/6LG6iyJxQz

Joined April 2011

Don't wanna be here? Send us removal request.

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@RueNahcMohr

Rue Mohr

4 years

Do you life activities include diagnosing bad capacitors on circuit boards? Take the time to build an in-circuit capacitor tester and stop needlessly replacing caps that are fine! It takes just seconds to go thru a board and identify all the bad caps!

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@RueNahcMohr

Rue Mohr

28 days

'U' is a handy character because its hex code is 0x55, which is 01010101 in binary. This makes it really easy to test baud rates for serial cause the electrons go: _-_-_-_- I expect everyone following me already knows this (if you didn't, you can just lie)

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@RueNahcMohr

Rue Mohr

2 years

Twitter has done wonders for my photoshopping skillz ❤️

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@RueNahcMohr

Rue Mohr

5 months

ITS 1AM. I GOT SERIAL PROGRAMMING WORKING ON THE 1 BIT COMPUTER!!!!!! THIS IS __AWESOME__!!!!! (ugh, so much fight) now I can *just* upload programs to it!!! Its running off an SRAM chip!!!

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@RueNahcMohr

Rue Mohr

2 years

!!!WOW I didn't expect that much of a difference!

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@RueNahcMohr

Rue Mohr

3 months

Why would they glue down the only part that would ever need to be replaced???

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@RueNahcMohr

Rue Mohr

1 year

all my followers see this, right?

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@amazing_physics

Amazing Physics

@amazing_physics

1 year

Stairs🤔

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@RueNahcMohr

Rue Mohr

1 year

ok, the test shows that I am finding this WAY too entertaining! This is a tiny13 and A4988 motor driver. The input is analog 0-5V from a potentiometer. Who wants a copy of the code!? *may still have bugs. The next step is Hobby PWM control.

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@RueNahcMohr

Rue Mohr

1 year

Dear twitter, today i found a wonderful toy

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@RueNahcMohr

Rue Mohr

5 years

@CousinBarnabas @MLE_Online 🤣 "mmmm seedless, thanks"

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@RueNahcMohr

Rue Mohr

1 year

Did someone say 16 phase rectifier?

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@RueNahcMohr

Rue Mohr

4 months

YES!!!! I can just assemble a program for the 1 bit computer and upload it thru a serial port!!! Here are the two assembled units side by side, being loaded with a program after powerup. I have 64k SRAM chips installed in these. The 555 clock module is adjustable.

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@RueNahcMohr

Rue Mohr

5 years

Finally!, the secret to mounting those things on protoboard!

@to_1805

とにー

5 years

最近見かけた某氏のDCジャック固定方法試作ならわざわざ穴開けることないし便利かも

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@RueNahcMohr

Rue Mohr

1 year

Progress on the upload software for the 1 bit computer......

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@RueNahcMohr

Rue Mohr

1 year

I'm not posting this to get likes, but because I think you will like it.

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@RueNahcMohr

Rue Mohr

3 years

🤣🤣🤣 ok, there we have that, a steam powered CPLD LED flasher. hahahaha Seeing as I'm multitasking anyhow, why not just randomly mix projects?

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@RueNahcMohr

Rue Mohr

1 year

This is both super cool and totally unimpressive. This 1 bit computer samples an input and sends the value as an ASCII character at 9600 baud using a carefully trimmed 555 RC oscillator. This is the source code I posted earlier this week!

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@RueNahcMohr

Rue Mohr

1 month

OMG. Its happened, its actually happened. An error in a PCB design, due to a weakpoint in PCB cad software (kicad!!!) has actually lead to the creation of a new hardware component.... (image credit )

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@RueNahcMohr

Rue Mohr

6 months

HARDWARE STATE MACHINES I was so frustrated when I was first starting with this stuff because I had NOBODY I could talk to who understood any of it. (till about 3 years ago) I will try to tell the story of my work in order. This is the basic configuration:

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@RueNahcMohr

Rue Mohr

1 year

In this strange game, its the toys challenge to not touch you! This worked nicely, sorry I didn't make a proper thread for it, if you search back thru my twitter mess you can find the other bits of it :] attiny13, 2x IR sensors and LEDs, motor driver (and a sticky slider)

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@RueNahcMohr

Rue Mohr

4 years

Lets play a game... For 256 likes, I'll pull out the little one (portable II) and do a video of starting it up.. For 512 likes, I'll pull out the HUGE old luggable and try booting IT up. I'm not worried as I anticipate 8 likes here. 😜 RueNahcMohr - NOT RETRO COMPUTING GUY, OK?

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@RueNahcMohr

Rue Mohr

1 year

1-bit computer programming thread. Cause, why not? The 1-bit computer programs via an assembler-like language. My plan here is to make a loooooooong boring thread about programming it! :]

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@RueNahcMohr

Rue Mohr

1 year

chip of the day!! 7 segment to BCD encoder! hahahahah

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@RueNahcMohr

Rue Mohr

6 months

I am so happy right now!

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@RueNahcMohr

Rue Mohr

2 months

So, it should be possible to make an LED that when powered, plays an internally stored music loop via a TOSLINK stream....

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@RueNahcMohr

Rue Mohr

9 months

I HAVE DONE IT! I HAVE DONE THE THING EVERYONE KNEW I COULD DO! Its an operational interactive 74ls138 svg Give it a try! hint: red is high, green is low. pins G2* need to be low for it to be enabled. A,B,C select the active output pin.

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@RueNahcMohr

Rue Mohr

4 months

Going thru old stuff, I need to make more soldering gun tips!!! (this is from 2017 when I did the last batch)

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@RueNahcMohr

Rue Mohr

1 year

PID loop controller ok, lets see what you.... HEY! WAIT!!.... :/

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@RueNahcMohr

Rue Mohr

24 days

"OMFG, IT WORKS" This is so crazy cool! This is audio encoded as a corrupt 1 bit stream that you can regenerate with an RC lowpass. This video is the recording setup, but 1 wire was moved to test play (and it works) Whole audio here: @LOOKMUMNOCMPUTR HeLLo

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@RueNahcMohr

Rue Mohr

3 months

While looking for a good video card I found this. How stupid! its got no outputs!!! ;)

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@RueNahcMohr

Rue Mohr

2 years

🤣🤣🤣🤣 30MW, and thats just the pre-amp, wait until you see the power stage!!

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@RueNahcMohr

Rue Mohr

1 year

(Sorting boxes of misc stuff) Meh, laptop floppy drive.. WAIT... wut this????

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@RueNahcMohr

Rue Mohr

3 months

Morning schematic, T flipflop.

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@RueNahcMohr

Rue Mohr

4 months

DIY crystal oscillator with DIY vacuum tube and DIY quartz crystal! :]

@murabi10_c1815

ヤギ型トランジスタ

@murabi10_c1815

4 months

やった！！！！！！！！自分で切り出した水晶板と自作の真空管で水晶発振回路を組み立てて発振させることに成功した！！！！！！！！！！！！！これで無線機が作れるぞ！！！！

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@RueNahcMohr

Rue Mohr

4 months

A programming hardware B CPU core C input chip D output chip E clock (555 or crystal) F 7 user LEDs G 7 user switches H Floppy drive power connector I Serial port for programming and output Jumpers allow LEDs and switches to be disconnected. :] The other 74HC14 is glue logic ;]

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@RueNahcMohr

Rue Mohr

5 months

How about a thread of wonderful new tech from 2023... (yea, I hit the rate limit on mastadon while posting my 2023 summary...) 1) EGMK. Educated guess motor kicking, for stepping DC servos. WORKS GREAT! (if your motor doesn't blow up)

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@RueNahcMohr

Rue Mohr

1 year

Good news on the 1-bit computer!

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@RueNahcMohr

Rue Mohr

1 year

YAAAy! this code is "ready" for release too! Have fun kids! attiny13 and stepper driver to make servo.

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@RueNahcMohr

Rue Mohr

1 year

🤬🤬🤬🤬🤬 CHARGE ONLY CABLE!!!! RRRRRRRRR }:[

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@RueNahcMohr

Rue Mohr

1 year

My name is Rue, and I have a problem.... [I'm short on breadboards again...]

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@RueNahcMohr

Rue Mohr

1 year

Hey, stop doom scrolling for a sec. Do you want to build one of those 1-bit computers? Tell me what details aren't in the github repo that you feel you need and I'll try to add the info! :]

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@RueNahcMohr

Rue Mohr

4 months

SEE THESE WIGGLES? These are bad wiggles....

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@RueNahcMohr

Rue Mohr

1 year

😯

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Cancel PWM DAC ripple with analog subtraction—revisited - EDN Asia

Improving upon an old design idea for filtering and attenuating PWM DAC output ripple to yield an increase in respond speed without any increase in circuit complexity and cost.

www.ednasia.com

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@RueNahcMohr

Rue Mohr

4 months

Morning, schematics!

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@RueNahcMohr

Rue Mohr

4 months

Are you tired of hearing about the 1 bit computer yet? There is more! I built a 9.6kHz 555 module, here is the 1 bit doing serial data! Its reporting the state of the switch in ASCII. Look, its fast enough to have caught the switch bounce!

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@RueNahcMohr

Rue Mohr

4 months

Morning schematic, I'll try to make it a daily (maybe 5 days a week...)

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@RueNahcMohr

Rue Mohr

8 months

I could have been a computer programmer that nobody has ever heard of, but no, here I am, on twitter, with aluminum chaff in my *everywhere* I could be working on FPGA stuff right now...

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@RueNahcMohr

Rue Mohr

5 months

Because you don't always have to use a microcontroller.

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@RueNahcMohr

Rue Mohr

2 months

This is cool, all the fets are in sockets on the heatsink. I can 'unplug' the heatsink with all the fets attached.

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@RueNahcMohr

Rue Mohr

4 months

Technology levels: Can it run linux? Can it run doom? Can it play bad apple? Can it say Hello world? Can it blink an led?

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@RueNahcMohr

Rue Mohr

1 year

What is Rue doing at 2am? Reading books of schematics... I came across this circuit that sparked an idea for an old project... I have an "on-demand" hot water heater. It can take a while for the hot water to get to the bathroom tap. I wanted to add a warm water indicator.

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@RueNahcMohr

Rue Mohr

7 months

The obvious next question is: Can the circuit be made to fit *here*

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@RueNahcMohr

Rue Mohr

10 months

... NOP NOP NOP CALL 0x0742 CALL 0x14CB ... Decoding binary by eye... Does this happen to other people too when looking at binary dumps?

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@RueNahcMohr

Rue Mohr

11 months

I have shoes on.. their just painted to look like bare feet..😅 "Set the mower loose!"

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@RueNahcMohr

Rue Mohr

11 months

@shieladixon Command line tools often trip up on spaces. In lots of situations command line is much faster to use than gui.

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@RueNahcMohr

Rue Mohr

5 years

@AwwwwCats My cat routinely goes up and down this ladder to my shop roof, always catches visitors off guard. I can coax him down, can't prompt him to go up on queue.

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@RueNahcMohr

Rue Mohr

7 months

I could be playing a video game, but no, I needed a boss that was a bigger challenge... is there a cheat code for this?

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@RueNahcMohr

Rue Mohr

9 months

heh, no, not that one...

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@RueNahcMohr

Rue Mohr

4 months

Here is assembling source and uploading a hello world program for that 1 bit computer :] 55% of the program space! my largest program yet!!!

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@RueNahcMohr

Rue Mohr

4 years

@JamesFarmer87 @TiklishHoneyBee see this chap too.

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@RueNahcMohr

Rue Mohr

27 days

I been at this for years now, I'm giving up and buying a power supply from aliexpress :/ (@#$%@&@#$%)

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@RueNahcMohr

Rue Mohr

24 days

I have updated the github repo with the source code and schematics for the encoder. I'm sorry I'm not going to tune this circuit. Please play with it yourself if you like. serial->audio using an RC :]

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@RueNahcMohr

Rue Mohr

5 months

I will update github diagrams and software for the 1 bit computer, the ALU will require a major modification to the assembler. Its super cool to be able to just assemble and upload software to this thing, I love this!!!

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@RueNahcMohr

Rue Mohr

1 year

1 bit computer with 9600 baud serial programming interface. This schematic is on the border of too complex to be fit on a page of paper :/ I skipped most of the pin numbers because its going to get silly. The 28C64 can be substituted for a 64k SRAM. I dont think I made any errors

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@RueNahcMohr

Rue Mohr

5 months

I am trying to continue the 1 bit computer work, and nothing is adding up. I think I'v found the corrected values for the encoding, but the wire-wrapped build is completely missing one of the 74595...

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@RueNahcMohr

Rue Mohr

4 months

Dare I attempt pong on a 1-bit computer?

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@RueNahcMohr

Rue Mohr

4 months

#RedWings Sports is stupid, CHECK OUT THESE SCHEMATICS!!!

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@RueNahcMohr

Rue Mohr

7 months

yep, its addictive....

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@RueNahcMohr

Rue Mohr

1 year

Here is one to help blow your mind @ag88_ There is no sensor on this, the microcontroller is tracking the position by the backEMF of the motor. I did not do as good a job as the Japanese person who inspired me to try (sorry I don't remember who you were!)

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@RueNahcMohr

Rue Mohr

2 years

A table, for makers. The surface travels quite slowly to the left, about 5mm per day. The left edge of the table empties into a tub.

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@RueNahcMohr

Rue Mohr

3 months

A nice thing about a book is being able to trace the information source a bit. "73 magazine, June, 1983 page 106."

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@RueNahcMohr

Rue Mohr

1 year

This is a display from one of the things I stripped down for parts recently.

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@RueNahcMohr

Rue Mohr

2 years

random old images

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@RueNahcMohr

Rue Mohr

4 months

Hi, My name is Rue Mohr, I so all sorts of electronics and mechanical projects. This Feb I will be trying to focus on a servo control method I call Educated Guess Motor Kicking (EGMK). Its specifically aimed at high speed, low latency stepped control of positioning systems.

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@RueNahcMohr

Rue Mohr

4 months

Sine waves, I didn't do a distortion check...

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@RueNahcMohr

Rue Mohr

1 year

Hey, this is progress! I need to get the detector on both sides working next!

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@RueNahcMohr

Rue Mohr

9 months

"I want to redefine the way you think about analog meters."

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@RueNahcMohr

Rue Mohr

28 days

@nixcraft Why. What is the point to this change. And systemd sucks, makes machines take 10x longer to boot with less then 1/4 the reliability (systemd fails for simple issues that should not stop the boot process)

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@RueNahcMohr

Rue Mohr

9 months

:) That opportunity to crawl into the head of someone who existed about 100 years ago and see a bit about what they were thinking...

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@RueNahcMohr

Rue Mohr

2 years

Rue: "I feel like doing something silly" Rue: "How silly?" Rue: "Just a sec..."🤪 Rue: "EEEEEEEEE!!!"😱

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@RueNahcMohr

Rue Mohr

28 days

@shadowbanenub But decimal 42 is '*' in ascii, which is the wildcard for everything (life, the universe, AND everything) ;]

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@RueNahcMohr

Rue Mohr

1 month

Next time you hear someone say code has to be limited to 80 columns, tell them we wont be going back to punch cards, so no.

@kenshirriff

Ken Shirriff

1 month

@ComputerHistory A punch card holds 80 characters, one per column. The holes in each column represent the character. Cards can be punched manually with a typewriter-like keypunch. Or the computer can punch cards at high speed through an attached reader/punch. 2/9

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@RueNahcMohr

Rue Mohr

3 years

My shop has a pretty big collection of parts drawers. I'll make this a thread about whats all in it, and a bit about what is not.

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@RueNahcMohr

Rue Mohr

1 year

New electric stove technology being developed that will allow your stove to flip the pancakes over for you!

@coilgun_9

こいるガン⑨〜

1 year

本日は全国的に大雪となり、ところによりフライパンに注意です。

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@RueNahcMohr

Rue Mohr

9 months

ok, I cant find the last device I put a DIP smt carrier, in, so, I'll make another one... Spoiler alert, the image below is the result. don't look if you don't want to see how it turned out. (just don't look down) (at the image just under this text) (try harder...)

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@RueNahcMohr

Rue Mohr

1 year

You walk into the workshop of a remote office. Your co-worker at this site asks if you would like "this old thing" he points to a plain looking beige metal box on a cart. Do you accept the box?

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@RueNahcMohr

Rue Mohr

1 year

Serial programming of the 1 bit computer is working!!!!! But, only at 9600 baud... Here I have a 64k ram chip that I upload 2 different programs to! I will post schematics and software a bit later!

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@RueNahcMohr

Rue Mohr

1 year

So, the error in my software uart RX caused the character 'b' to receive as 'F' The code for 'b' is 0x62 The code for 'F' is 0x46 0x62 is 01100010 0x46 is 01000110 Can you see the error? :]

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@RueNahcMohr

Rue Mohr

8 months

60Yr old cable pulled out of work with some amazing colours.

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@RueNahcMohr

Rue Mohr

2 months

I keep these. I dont know why. I would NEVER allow myself to design or build anything inefficient enough to need them. Its a circle, and its hurting me.

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@RueNahcMohr

Rue Mohr

11 months

A d-sub connector, 2 row density, normal pins (think db9) is rated to 5A. How much current would YOU trust it to?

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@RueNahcMohr

Rue Mohr

1 year

This project is being difficult, but now I just need a motor driver. (you will see later)

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@RueNahcMohr

Rue Mohr

3 years

🤣 its 3am. I won. Dead bug BGA CPLD. heh, too much fun! Clock is 33MHz, counter is 26 bits. There is a whole lot more I/O I can play with. Programmed with ISE and xc3sprog on Linux.

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@RueNahcMohr

Rue Mohr

4 months

Herbert Wigwe is trending on twitter, good for that person? BUT FOR SOMETHING INTERESTING, WE HAVE SOME SCHEMATICS!!!

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@RueNahcMohr

Rue Mohr

4 years

ok! seeing as I'm taking it apart soon.. @SteeleCryotank Here ya go.

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@RueNahcMohr

Rue Mohr

1 year

As its related, here is a project from Jan 2022. Credits for this project idea go to @sudamin ! This is a 3V DC motor with no sensors. BackEMF is used to try to track position. Breadboard has op-amp and motor driver. Uno board is used for a controller.

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@RueNahcMohr

Rue Mohr

5 years

NO MICROCONTROLLER! 4 transistors 8 resistors, and a 74HC574! scanless keyboard circuit! #diy #electronics #keyboard #scanless

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@RueNahcMohr

Rue Mohr

4 months

OMG you just open photoshop and before you know it, its freaking 4am! This is a diagram of the 1 bit computer, its not really all that accurate, but its accurate enough. I will now take questions (expect why it looks like a 8051 datasheet from like 1980) *COUGH*

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@RueNahcMohr

Rue Mohr

26 days

Mail delivery! Another 5 times I can try to stop myself from trying to cut that wire thats a *little* too large for the lead trimming cutters.... *snap*! ... awe.....

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@RueNahcMohr

Rue Mohr

6 months

The first test of the pickup head looks good...

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