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@kmobs
kmobs / frequencytester.md
Last active March 29, 2024 14:44
Frequency Tester

Frequency Testing

This will allow you to test a specific frequency that you hear when you do your resonance testing in Klipper and potentially track down where extra peaks are coming from. If something is rattling at a specific frequency, you can specify that frequency and feel around the printer until you track it down.

Code was adopted by zifnab from somewhere in Klipper.

Usage

You have to have [resonance_holder] in your printer.cfg.

The command is HOLD_RESONANCE AXIS=<axis> FREQ=int SECONDS=<seconds>

@ktosiek
ktosiek / PA profile-set astro-a50-gen4.conf
Last active February 27, 2024 22:46
Astro A50 support on Linux - basic configuration for PulseAudio 13 (tested on Ubuntu's 13.99.1). Install the files and reboot, to make sure udev and PA reloaded :-)
; /usr/share/pulseaudio/alsa-mixer/profile-sets/astro-a50-gen4.conf
[General]
auto-profiles = yes
[Mapping analog-voice]
description = Voice
device-strings = hw:%f,0,0
channel-map = left,right
paths-output = steelseries-arctis-output-chat-common
@bistory
bistory / Klipper Anycubic i3 Mega
Last active August 3, 2023 11:00
Anycubic i3 Mega configuration for Klipper (with TMC2209 + SPI, BMG extruder with stock motor, pressure advance and BLTouch clone)
# This file contains pin mappings for the Anycubic i3 Mega with
# Ultrabase from 2017. (This config may work on an Anycubic i3 Mega v1
# prior to the Ultrabase if you comment out the definition of the
# endstop_pin in the stepper_z1 section.) To use this config, the
# firmware should be compiled for the AVR atmega2560.
# See the example.cfg file for a description of available parameters.
[stepper_x]
step_pin: PF0
@andywer
andywer / postgres-outage.md
Created August 21, 2018 05:03
Post Mortem: Postgres outage on 2018-08-20

2018-08-20: Postgres failure

What happened

The PostgreSQL container stopped unexpectedly, was automatically restarted, but suddenly didn't accept any connections anymore. Neither from the API service containers nor from the Macbook over the internet.

Error in logs:

FATAL:  pg_hba.conf rejects connection for host "10.0.1.2", user "postgres", database "******", SSL off
sudo apt-get update
sudo apt-get install build-essential chrpath libssl-dev libxft-dev -y
sudo apt-get install libfreetype6 libfreetype6-dev -y
sudo apt-get install libfontconfig1 libfontconfig1-dev -y
cd ~
export PHANTOM_JS="phantomjs-2.1.1-linux-x86_64"
wget https://github.com/Medium/phantomjs/releases/download/v2.1.1/$PHANTOM_JS.tar.bz2
sudo tar xvjf $PHANTOM_JS.tar.bz2
sudo mv $PHANTOM_JS /usr/local/share
sudo ln -sf /usr/local/share/$PHANTOM_JS/bin/phantomjs /usr/local/bin
@rob-murray
rob-murray / find_dups.rb
Created October 27, 2015 09:59
Rails find duplicate records
columns_that_make_record_distinct = [:some_id, :another_name]
distinct_ids = Model.select("MIN(id) as id").group(columns_that_make_record_distinct).map(&:id)
duplicate_records = Model.where.not(id: distinct_ids)
@rock3m
rock3m / lm35-to-thingspeak.lua
Last active March 25, 2018 00:58
Detecting the indoor temperature using LM35, and send the periodic recordings to ThingSpeak via WiFi. See project details at https://medium.com/grace-learns-iot/day-7-monitoring-home-temperature-on-the-internet-26c175ee7200
--- Config
SSID = "YOUR_WIFI_NAME"
PASSWORD = "YOUR_WIFI_PASSWORD"
TIMEOUT = 30000000 -- 30s
--- Station modes
STAMODE = {
STATION_IDLE = 0,
STATION_CONNECTING = 1,
STATION_WRONG_PASSWORD = 2,
@foosel
foosel / README.md
Last active January 24, 2017 20:14
First experiments with NodeMCU to publish the current settings of my adjustable height working desk to MQTT

First experiments with NodeMCU to publish the current settings of my adjustable height working desk to MQTT.

NodeMCU can be found here: https://github.com/nodemcu/nodemcu-firmware

Note that you'll need a current version with support for floats (which the ultrasonic sensor library utilizes), I'm using 0.9.5 2015-03-18 with float support myself.

Support for the HC-SR04 sensor in NodeMCU can be found here: https://github.com/sza2/node_hcsr04

I provided my slightly adjusted version which makes measuring a non-blocking afair, allowing for callbacks when the measurement completes.

@chunlea
chunlea / input-group-in-simple-form.md
Last active October 5, 2021 20:03
How to use Boostrap 3 input-group in Simple Form

Finally, Simple Form support Boostrap 3. 👏

But I found it still dosen't support some components in Bootstrap 3. Or may be in the future. But I can't wait, so I find a solution to support them. It was inspired by heartcombo/simple_form#531 (comment) .

This is a final solution and I used in my project.

simple_form

@christopher-hopper
christopher-hopper / vm-resize-hard-disk.md
Last active April 5, 2022 10:30
Resize a Hard Disk for a Virtual Machine provisioned using Vagrant from a Linux base box to run using VirutalBox.

Resize a Hard Disk for a Virtual Machine

Our Virtual Machines are provisioned using Vagrant from a Linux base box to run using VirutalBox. If the Hard Disk space runs out and you cannot remove files to free-up space, you can resize the Hard Disk using some VirtualBox and Linux commands.

Some assumptions

The following steps assume you've got a set-up like mine, where: