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Fig 1.1- UDLD Protocol Tx and Rx |
A few weeks ago, I shared an article about leveraging the Meraki API and a Raspberry Pi to create a Dummy Light for My Network. Today’s article expands on this slightly by adding a 16×2 LCD Display for additional output flexibility. For the sake of demonstration, we will continue to use the Meraki API as the source of what will be displayed. An example of what I have built is shown immediately below in this short video.
TL;DR
To accomplish this, I added the HD44780 to my Raspberry Pi (Pi 2 Model B) using the following pinout.
#connect LCD Pin 1 (VSS) to Ground #connect LCD Pin 2 (VDD) to 5v rail #connect LCD Pin 3 (VO) to potentiometer #connect LCD Pin 4 (RS) to 37 #connect LCD Pin 5 (RW) to Ground #connect LCD Pin 6 (E) to 35 #connect LCD Pin 12 #connect LCD Pin 13 #connect LCD Pin 14 #connect LCD Pin 15 #connect LCD andode (a) to 5v rail (Phy Pin 2) with resistance #connect LCD cathode (k) to Ground Rail (Phy Pin 6) #connect potentiometer to 5v and ground rails
Next, I wrote the following Python Script.
import requests import json import RPi.GPIO as GPIO import Continue reading
A few weeks ago, I shared an article about leveraging the Meraki API and a Raspberry Pi to create a Dummy Light for My Network. Today’s article expands on this slightly by adding a 16×2 LCD Display for additional output flexibility. For the sake of demonstration, we will continue to use the Meraki API as the source of what will be displayed. An example of what I have built is shown immediately below in this short video.
TL;DR
To accomplish this, I added the HD44780 to my Raspberry Pi (Pi 2 Model B) using the following pinout.
#connect LCD Pin 1 (VSS) to Ground #connect LCD Pin 2 (VDD) to 5v rail #connect LCD Pin 3 (VO) to potentiometer #connect LCD Pin 4 (RS) to 37 #connect LCD Pin 5 (RW) to Ground #connect LCD Pin 6 (E) to 35 #connect LCD Pin 12 #connect LCD Pin 13 #connect LCD Pin 14 #connect LCD Pin 15 #connect LCD andode (a) to 5v rail (Phy Pin 2) with resistance #connect LCD cathode (k) to Ground Rail (Phy Pin 6) #connect potentiometer to 5v and ground rails
Next, I wrote the following Python Script.
import requests import json import RPi.GPIO as GPIO import Continue reading
A few weeks ago, I shared an article about leveraging the Meraki API and a Raspberry Pi to create a Dummy Light for My Network. Today’s article expands on this slightly by adding a 16×2 LCD Display for additional output flexibility. For the sake of demonstration, we will continue to use the Meraki API as the source of what will be displayed. An example of what I have built is shown immediately below in this short video.
TL;DR
To accomplish this, I added the HD44780 to my Raspberry Pi (Pi 2 Model B) using the following pinout.
#connect LCD Pin 1 (VSS) to Ground #connect LCD Pin 2 (VDD) to 5v rail #connect LCD Pin 3 (VO) to potentiometer #connect LCD Pin 4 (RS) to 37 #connect LCD Pin 5 (RW) to Ground #connect LCD Pin 6 (E) to 35 #connect LCD Pin 12 #connect LCD Pin 13 #connect LCD Pin 14 #connect LCD Pin 15 #connect LCD andode (a) to 5v rail (Phy Pin 2) with resistance #connect LCD cathode (k) to Ground Rail (Phy Pin 6) #connect potentiometer to 5v and ground rails
Next, I wrote the following Python Script.
import requests import json import RPi.GPIO as GPIO import Continue reading
The SDS market is projected to grow 29 percent each year between now and 2025.
I won’t be publishing anything here from the 25th through the 29th, so the next post here will be next year, in 2018.
Imagine you’re at the starting line of a race, excited about the opportunity that awaits you when you complete the course. The starting pistol is fired and you try to take off, but instead of soaring with the other runners, you stumble. You look down to see that someone has slashed your shoelaces. As you crouch down to try to fix them, you see the others gain distance ahead of you.
This is the reality for many women who use the Internet. The technology is the same and its potential is the same for men and women. But when women go online, there are barriers to access and safety that men do not experience. While men might worry about identity theft or a virus, women – along with trans and non-binary users – are navigating a minefield of sexualized harassment, whether they’re on a dating site, gaming, or using social media. The sexual violence women are exposed to in the physical world translates to the online space.
According to a 2017 survey from Pew Research Center, women and men experience and view online harassment very differently. The survey found that, while 41 percent of Americans have experienced online harassment, Continue reading
Last week, the IP address space belonging to several high-profile companies, including Google, Facebook and Apple, was briefly announced out of Russia, as was first reported by BGPmon.
Following the incident, Job Snijders of NTT wrote in a post entitled, “What to do about BGP hijacks”. He stated that, given the inherent security weaknesses in BGP, things will only improve “the moment it becomes socially unacceptable to operate an Internet network without adequate protections in place” and thus customers would stop buying transit from providers that operate without proper route filtering.
Since Job has presented at NANOG about the various filtering methods employed by NTT, I decided to look into how well NTT (AS2914) did in this particular incident. While a handful of the 80 misdirected routes were ultimately carried on by AS2914 to the greater internet, NTT didn’t contribute to the leaking of any of the major internet companies, such as Facebook, Google, Apple, etc. In fact, when one analyzes the propagation of every one of these leaked routes, a pattern begins to emerge.
Route Leaks by AS39523
On 12 December 2017, AS39523 announced 80 prefixes (only one of which was theirs) for two different 3-4 Continue reading
The project brings together data scientists and software engineers.
Because this is the last “weekend reads” of the year, I’m supersizing it, and including a few articles at the end on culture I found interesting. The majority of the other stories relate to security, as always.
GPS has become such an ingrained part of our culture that many of us don’t even think about it anymore. If you want to go check out a new restaurant but don’t know where it is, search for it in Google Maps. Want to map your Continue reading
Dell EMC continues to lead the HCI vendor market, according to IDC.
Qualcomm rejects Broadcom board nominees; Ericsson, Vodafone complete pre-standard 5G test; CENX signs Open API Manifesto.
Schmidt joined the company in 2001 when it only had a few hundred employees.
This is Microsoft's second price cut this year.