The August 2016 DFW Hackster MQTT meeting was a blast. Here is a link to the online presentation. https://sway.com/DpyBV3JjNYoTFrsx
If you check back on this post I will update it with related videos. I promised some people at the event to do an Arduino MQTT demo and also finish up my video on the MQTT garage door opener.
If you want to get started with MQTT in your own time here are some resources:
What is MQTT
TI LaunchPad MQTT demo.
Software to Download:
Download HiveMQ it is free but they will make you fill out contact information for the download link. There is lots of great info and white papers on MQTT here so stay awhile and do some reading!
You will need a MQTT test client, I suggest MQTT.FX
Here are source code samples for NodeMCU, WeMos, and TILaunchpad.
I want Node-Red to start up (and other command line programs) when Windows 10 starts. Batch files are a simple way to achieve this.
One feature, bad or good, is the batch file will open a command prompt window that essentially acts like a live log viewer for node-red. This is fine for my application because I have a PC dedicated running 24-7 for a camera video server, MQTT server, and now Node-Red. I like being able to see what Node-Red is doing, if you want Node-Red to run in the background as a service you will want to use a different method.
Cortana can easily be extended to aid you with your DIY home automaton projects. In this example Cortana sends MQTT commands to open and close a garage door as well as ring the doorbell with custom jingles. By the way, you don’t have to use MQTT, you can also do a whole lot of other things as well from opening a file, opening a program, or launching your favorite websites.
As of the writing of this entry I am frantically trying to finish documenting the MQTT Doorbell and Garage Door Opener devices in separate posts. Hopefully I can get those whipped out in a few days.
Homemade bubble machine complete with variable speed bubble wand, variable speed fan. PID loop controlled heaters to heat the air to give the bubbles more lift.
- 150W PC power supply
- Fan: NIDEC BetaV M# 35291-35 2.3A
- EZ HEat 300W band heater 1.5”
- PID controller REX-C100
- 12 Volt gear motor from Tokyo Micro
- Fotek Solid State Relay SSR-25DA
This demo connects two TI LaunchPad devices together using MQTT. I have every intention to add other devices to the mix like Arduino, Netduino, RaspBerry Pi, and BeagleBone in the future.
The Simple Wi-Fi HC-21 module is a meager $10-$15 bucks on ebay right now. It is a simple Wi-Fi serial port server or virtual serial port. This means it is self contained and will handle all the overhead of negotiating a Wi-Fi connection and communication leaving more room for your application in the Arduino.
Windows 10 (Threshold, Technical Preview)
Microsoft released a “Technical Preview” of their new upcoming version of Windows operating system on October 1, 2014. This version of Windows will be named Windows 10. Here is a brief review that should help the average users decide if Windows 10 is for them. Keep in mind a lot could happen between now and mid 2015 when windows 10 is released.
error: expected unqualified-id before numeric constant
This Arduino IDE error blew my mind for a while, come to find out it can be caused from syntax errors. look for a missing semi colon or accidental text at the top of your sketch.
Thermostat1:1: error: expected unqualified-id before numeric constant
In file included from Thermostat1.ino:9: Read More…
Arduino Mini BMO
BMO from Comedy Central’s Adventure Time is adorable, if only someone would make one that can walk! Atleast we can make one with a personality. Here is a build using easy to get parts including Arduino Pro Mini, Nokia 3310 LCD screen, audio playback, accelerometers, and distance sensors. Read More…
X10 Lighting and appliance modules are cheap on Ebay, I wanted to control them with my HMI (ScadaBR) so I put a X10 and Modbus library together in an Arduino to turn on and off the modules.