qAVR – Script to compile a C program, generate the hex and flash the microcontroller


This shell script will compile a C program, generate an hex file and flash it to an AVR microcontroller.

For updates, check my github repository:

Read More →

1KHz signal generator with a 555 timer



555 IC Formulas


## Astable waveforms

Charge time (output high)

t1 = 0.693(Ra+Rb)C

Discharge time (output low)

t2 = 0.693(Rb)C

Total period

T = t1+t2 = 0.693(Ra+2Rb)C

Frequency of oscillation

f = 1/T = 1.44/(Ra+2Rb)C

Read More →

Configuring a SAML IDP with LDAP as authentication source


In this setup, the SAML IDP will be available at and we will use the ldap server configured in this post.

Start by moving to the directory above the DocumentRoot for the domain. Let’s say that it is /var/www/, so

cd /var/www/

Download the latest simplesamlphp version

wget && tar xvfz simplesamlphp-1.14.4.tar.gz

Read More →

Installing and configuring LDAP and phpldapadmin


This will be a minimal setup. It’s a good idea to start by doing an update and upgrade on your system. In debian, use:

apt-get update && apt-get upgrade

Install the packages (set and confirm admin password)

apt-get install slapd ldap-utils phpldapadmin

Then vim /etc/ldap/ldap.conf and include:

BASE dc=example,dc=net
URI ldap://

Read More →

Quick proxy script for sharing internet among devices


I created this script to automatize sharing of the hotspot connection I’m using.

My laptop is connected to the hotspot wifi. This internet connection will be shared to a router via an ethernet cable (which is also plugged to the laptop). The router then will distribute the connection to multiple devices.

Read More →

Docker guide


Install docker (you may need to reboot afterwards)

pacman -S docker

Start docker

systemctl start docker

Check docker information

docker info

Read More →