How to Reset the Arduino MKR1000

I am working on a project that uses the Arduino MKR1000 with ThingSpeak. While working on my code, I uploaded a bad sketch to the MKR1000. Every time that the board powers up, it starts running my bad code over and over and appears to be stuck in an infinite loop. I tried pressing the reset button, unplugging the USB cable, reboot my computer, reinstalling drivers, and unplugging the USB cable (for good measure). Nothing made the board responsive again. I found a forum post talking about the bootloader. The user mentioned that quickly pressing the reset button twice put the device into a good state by loading the bootloader. Success!

Tracking My Baby’s Progress on Our Software Team’s Kanban Board

My team at work uses a Kanban board to track our software development process. We use Kanban to track tasks and pull new tasks to our respective swim lanes. We use sticky notes to indicate our tasks and move them around to indicate their status, such as “To Develop”, “To Test”, or “Completed”.

Kanban is a method for managing knowledge work which balances demands for work with the available capacity for new work. Work items are visualized to give participants a view of progress and process, from task definition to customer delivery. Team members “pull” work as capacity permits, rather than work being “pushed” into the process when requested.

In software development, for example, Kanban provides a visual process-management system which aids decision-making about what, when and how much to produce. Although the method (inspired by the Toyota Production System and lean manufacturing) originated in software development and IT, it may be applied to any professional service whose work outcome is intangible rather than physical.


For fun, I added my baby as a task. And, tracked the sticky all the way to completion… He’s our best feature yet!


CheerLights Robot for Your Nursery

I shared my latest project over on my Nursery Hacks website. It combines some of my favorite things… IoT, CheerLights, ThingSpeak, Particle, and building things for my soon-to-be-here son’s nursery.  I didn’t want a bright light in the nursery, but I did want to build a little CheerLights display for something in the background.

I found a Robot Nightlight on Amazon and purchased it. This little robot is a great night-light and you can change the color using the included infrared remote control. To connect this light to CheerLights, I built an IR controller that is internet-connected using the Particle Photon. The Photon subscribes to the latest CheerLights color on ThingSpeak and transmits the IR code as if the button was pressed on the remote control.

To build your own CheerLights Robot, visit Nursery Hacks for the parts and code.

Brain Candy Live!

Brain Candy Live is a touring show featuring Adam Savage and Michael Stevens (Vsauce). My mind is blown think about these two guys together and seeing them live. I am addicted to their YouTube channels. I regularly watch Adam’s one day builds on Tested and Michael’s Vsauce. It’s got what brains crave.

Becky and I are excited to see the show in Worcester, MA this weekend. It is going to be epic.

Building Successful Online Communities

I am fascinated by how communities form. I fell into community building over 15 years ago when I had a comment thread on my website go crazy. Many people started commenting and replying to others and before I knew there were hundreds of comments. I installed forum and wiki software on my server and the conversation continued and more people joined in. A community formed – it grew, moderators took over, and people slowly left as interest in the topic waned.

I recommend the book Building Successful Online Communities. Communities are complex, but they lead to interesting discussions and discoveries.

Online communities are among the most popular destinations on the Internet, but not all online communities are equally successful. For every flourishing Facebook, there is a moribund Friendster — not to mention the scores of smaller social networking sites that never attracted enough members to be viable. This book offers lessons from theory and empirical research in the social sciences that can help improve the design of online communities.

What is the Use of Nonlinear Over Time?

I like the word nonlinear.

“In physical sciences, a nonlinear system is a system in which the output is not directly proportional to the input. Nonlinear problems are of interest to engineers, physicists and mathematicians and many other scientists because most systems are inherently nonlinear in nature. Nonlinear systems may appear chaotic, unpredictable or counterintuitive, contrasting with the much simpler linear systems.”


I wondered what the use of the word nonlinear over time was. I found Google Books and they track such things with their Ngram Viewer.

Use of nonlinear over time

The use of the word nonlinear in books is decidedly nonlinear.

Measure Wi-Fi Signal Levels with the ESP8266 and ThingSpeak

Oh, my. I am sure you have been hearing about the Internet of Things… The IoT! You might be wondering how to get started with i(o)t. There are many places to start. You might be interested in the data that devices collect and analyzing it or you might be interested in how to deploy thousands of sensors around a factory floor to better understand how efficient things are. You might just want to tinker. Be the cool person at the party talking about Arduino, Raspberry Pi, and Maroon 5. If you want to try out a “thing” – a small, connected device – that can measure data, I will help you get started with a quick tutorial using the ESP8266 “thing”.


First, you need to go by a thing on Amazon. I recommend for this project an ESP8266 compatible device like the NodeMCU. Don’t be scared. Add it to your Amazon shopping list or ask Alexa to buy you one. It’s $8.

ESP8266 NodeMCU

Other parts that you will need:

  • Laptop
  • Micro USB cable


While you are waiting for your Amazon stuff to arrive, you can learn about ThingSpeak.

ThingSpeak IoT Platform

ThingSpeak is where we are going to store the data collected by our thing and where we can see the data that we collected. Visit and Sign Up for an account. This will just take a minute and user accounts are free. Once you have a user account, you need to create a channel. ThingSpeak channels are where data gets stored. Create a new channel by selecting Channels, My Channels, and then New Channel. Name the channel, “ESP8266 Signal Strength” and name Field 1, “RSSI”. Click “Save Channel” at the bottom to finish the process.



Once the ESP8266 comes in the mail in a couple of days you need to gather a few more things to be able to program this thing. You will need a laptop and a micro USB cable (like the one that you charge a phone with). On the laptop, we need to install some software to be able to program the ESP8266. Visit and install the Arduino IDE.

Arduino IDE

Once the Arduino IDE is installed, open the program so we can do a couple of setup steps to get it ready to program ESP8266 devices. Under File, Preferences, and Additional Boards Manager URLs, add this link: – this will allow the Arduino IDE to manage ESP8266 compatiable boards.

Arduino Preferences for ESP8266 programming

The thing that you bought from Amazon uses the CP2102 USB driver. You might have to install a USB driver from Silicon Labs for this to work with your computer. Connect the ESP8266 to your laptop with the micro USB cable.

USB Driver for the ESP8266 CP2102

Back on the Arduino IDE, under tools, configure the following settings:
Arduino Board Settings for NodeMCU

Whew. We got through the setup. Now we can program this device or any ESP8266 compatible device and shouldn’t have to do that again.


The code that the Arduino IDE uses is called a “sketch” – this is just a short program that the device runs over and over. In our project, we are going to have the code measure the signal strength of the Wi-Fi connection and upload the data to ThingSpeak, wait, and repeat. Over time we can see the signal strength of our Wi-Fi connection. Copy the example code to your Arduino IDE and change some of the defaults to match your Wi-Fi network and ThingSpeak settings.

Once everything is set, click Sketch and then Upload. This will take the code and program the ESP8266 with it. It takes a minute so be patient. If anything goes wrong, make sure that you have the right board settings and that your “Port” matches what your laptop thinks the port is.

Back on ThingSpeak, you should see data start to come in. You are looking for the Private View of your channel and a chart that is updating. As new dsata comes in, the chart shows the latest value. If you carry the ESP8266 around the house, you might notice the signal strength changing.


Next Steps

To take the project further, you can use MATLAB on ThingSpeak to do some data analysis. I will post about IoT data analytics on another day. The ESP8266 source code for sending data to ThingSpeak is available on GitHub.

Welcome to the Internet of Things. Let me know if you try this out and let me know if you take this project further and build something cool.

Learn How to Use MQTT.fx with ThingSpeak

ThingSpeak just announced that they added MQTT as a way to send data to a ThingSpeak channel. This is great news since a lot of devices support MQTT. If you don’t have a device, but want to try out the MQTT protocol with ThingSpeak, you can use a desktop application called MQTT.fx. In this example, I am going to explain how to use MQTT.fx to send data to a ThingSpeak channel.

ThingSpeak MQTT Broker

Setup ThingSpeak

  • Sign up for ThingSpeak (or log in if you have an account)
  • Create a new channel
  • Note the Channel ID and Write API Key

Setup MQTT.fx

  • Download and install MQTT.fx.
  • Configure the connection profile for the desktop MQTT client.
    • Broker Address:
    • Broker Port: 1883

MQTT.fx Screenshot

  • Click Connect to connect to the ThingSpeak MQTT broker.


  • Enter the topic channels/<channelID>/publish/<apikey> to publish data to a channel feed. Replace <channelID> with the channel ID and <apikey> with the write API key of the channel. Enter the message to publish to the channel feed. This PUBLISH message publishes a value of 45 to field 1 and 60 to field 2 of the specified channel, along with a status message MQTTPUBLISH.


  • Alternatively, you can enter the topic channels/<channelID>/publish/fields/field<fieldnumber>/<apikey> to publish to a channel field. Replace <channelID> with the channel ID, <fieldnumber> with field number that want to update, and <apikey> with the write API key of the channel. Enter the message to publish to the channel field. This PUBLISH message publishes a value of 45 to field 1 of the specified channel.


Additional Resources

  • MQTT Basics – Learn about the publish/subscribe architecture for connecting bandwidth and power-constrained devices over wireless networks
  • MQTT Client Configuration – Learn how to set up an MQTT client to communicate with the ThingSpeak MQTT broker
  • Choose Between REST and MQTT – Learn when to use REST and MQTT to update a channel