BuildStatusTrafficLight

Project BuildStatusTrafficLight
A traffic light showing CI build status
Status	In progress
Contact	bertrik
Last Update	2018-10-26

Introduction

The end result of this project is a traffic light that shows the status of a software build.

It can show the following statuses:

• red: build has failed to compile
• yellow: build compiles but a unit test fails
• green: build is OK
• yellow flashing: build status unknown, e.g. still starting up, connection problem, or we receive a status we don't understand

Hardware

The plan is to use an ESP8266 (e.g. Wemos D1 mini) along with a modified toy traffic light (see below). Perhaps I'll need some kind of LED or bulb driver too.

Apparently, the ESP8266 can source about 12 mA and sink about 20 mA of current. This is enough for a small LED, might need more, I'll just have to see what kind of LED/bulb is inside the toy traffic light.

Bonus point if we can add sound when the status changes.

This one has been ordered, to be modified with the ESP8266.

Software

Source code can be found here.

It is written in C/C++ for Arduino for quick and easy development using existing libraries, like WifiManager, PubSubClient.

The plan is to simply listen to an MQTT stream. To keep things secure and secret as much as possible, I plan to use an encrypted link to the MQTT server along with a username/password.

External links

• Jenkins traffic light plugin seems to have the wrong kind of interface, designed to directly drive a bunch of wireless 230V sockets instead of just sending the information like I need
• Signalling Your Jenkins Build Status with a Mini USB Traffic Light