Jean Brito jeanfbrito

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>

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

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.

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.

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:

	; /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

	# 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

	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

	--- 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,

	columns_that_make_record_distinct = [:some_id, :another_name]

	duplicate_records = Model.where.not(id: Model.select("MIN(id) as id").group(columns_that_make_record_distinct))