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Arduino

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Articles related to lessons learned or projects built using Arduino devices or Arduino-compatible devices. This page lists all posts in the category, in reverse chronological order.

• Note: An AI Generated pill displayed in the list below indicates that the post description displayed on the page was generated from the post content using Generative AI (GenAI). The post content itself was written by a human (me).

• Cloud Function Certificate Issue

  Posted Tuesday, February 18, 2025 at 07:53 PM  in Arduino, ESP32, Internet of Things (IoT)
  

  After publishing my M5StackC-Plus Cloud Function Execution example, I used it for about a week before it just stopped working one day.

• ESP32 Request Repeater With Sleep

  Posted Tuesday, February 18, 2025 at 06:46 PM  in Arduino, ESP32, Internet of Things (IoT)
  

  In my previous post I described how to put an ESP device to sleep (allowing it to wake up later). I used a sample sketch I created, ESP32 Request Repeater (HTTP), to show how it works.

• Putting an ESP32 Device to Sleep

  Posted Sunday, February 16, 2025 at 08:15 AM  in Arduino, ESP32, Internet of Things (IoT)
  

  While playing around this week with a hardware project, I decided to spend some time learning how to use Sleep modes in an Arduino project on an ESP32 device. It turns out that it's not that hard to do, but you really have to pay attention to a couple of things as you code your project. In this post, I demonstrate how to build an Arduino project that sends a HTTP request to a remote server, puts the device running the sketch asleep for a few minutes, then wakes up and does it again until the device loses power.

• ESP32 Parroting Web Server

  Posted Saturday, February 15, 2025 at 08:41 PM  in Arduino, ESP32, Internet of Things (IoT)
  

  I'm working on a version of my Pumpkin LED Controller for the Unihiker M10 single board computer. Web and mobile apps have a variety of issues when connecting to a web server running on an ESP32 device (as I wrote about in Accessing an Arduino ESP32 Web Serverand Pumpkin Controller Native Apps for Windows) and I think a device like the Unihiker may provide a way around them.

• M5Stack M5StickC-PLUS Garage Door Opener

  Posted Tuesday, February 11, 2025 at 05:26 PM  in Arduino, ESP32, Internet of Things (IoT)
  

  In ESP32 HTTP Client Request with JSON Body I demonstrated how to call a remote API from an ESP32 device; in that example, the request body passed content in JSON format to the server. As I described in that post, I built that sample because I wanted to be able to build an ESP32 garage door opener and that was a stepping stone for me to this project.

• Certificate to Arduino Command-line

  Posted Friday, January 24, 2025 at 06:59 AM  in Arduino, JavaScript, Internet of Things (IoT)
  

  Before I created the web application described in Automated Public Cert to Arduino Header Conversion, I started with a simple node.js command-line utility. I like command-line tools and starting with the Node version made sense to me. I switched to the web app version once I realized that most people who needed to do the certificate conversion to Arduino wouldn't have node installed on their development systems.

• Corrupt Arduino IDE Installation

  Posted Saturday, January 11, 2025 at 08:57 AM  in Arduino, Internet of Things (IoT)
  

  AI Generated   I recently encountered issues compiling code for an M5Stack project and struggled to resolve them. After finding outdated libraries on my system, I uninstalled everything, deleted leftover files, and reinstalled. I discovered additional files in the AppData folder that were causing the problem. Once I removed all the folders and reinstalled, my issues were resolved. It seems my system's configuration had become corrupted, preventing updated library installations.

• Flame Throwing Pumpkin

  Posted Tuesday, October 15, 2024 at 07:34 PM  in Arduino, Internet of Things (IoT)
  

  Back in 2019, I decided to finally start work on a Flame Throwing pumpkin project for Halloween. I saw some projects like this in the past, and I wanted to do my own version. Some projects do some pretty sophisticated things to make a flame thrower in a pumpkin (like using a solenoid to push down the nozzle of a spray can (hair spray or WD-40)) but others use a simple air freshener (short spurt) in front of a candle.

• Using UDP Broadcast to Synchronize Actions Across Arduino Devices

  Posted November 5, 2023  in Arduino, ESP32, Raspberry Pi, Internet of Things (IoT)
  

  Describes a way to synchronize actions or activities across multiple Arduino devices using UDP (broadcast and receiver).

• Arduino UDP Broadcast Receiver

  Posted November 2, 2023  in Arduino, ESP32, Internet of Things (IoT), Flutter
  

  I created an Arduino sketch that implements an UDP broadcast receiver which allows me to control multiple Arduino devices simultaneously from a mobile app.

• Read Pin State Between Two Arduino Devices

  Posted November 1, 2023  in Arduino, Internet of Things (IoT)
  

  As I worked on my latest Halloween project, I realized that one of the things I wanted to do was read the pin state from a different/separate Arduino device. My project used two Arduino-compatible devices for different purposes and I wanted to be able to send a signal from one to the other. I looked around for a while and found a bunch of Forum questions on this topic and answers for the most part, but I couldn't find a post that actually described it in detail. This post does that.

• A Better Arduino MicroFogger Controller Redux

  Posted October 30, 2023  in Internet of Things (IoT), Arduino
  

  In my previous post, I demonstrated a better way to randomly generate smoke using the Vosentech MicroFogger 5 Pro from an Arduino sketch. That version was better because it didn’t block the main loop, instead it let other stuff while it generated smoke and waited.

• A Better Arduino MicroFogger Controller

  Posted October 29, 2023  in Arduino, Internet of Things (IoT)
  

  Describes a better way to control a Vosentech MicroFogger from an Arduino sketch. The example provided in the previous post blocked the sketch's `loop` function and this one doesn't.

• Controlling the Vosentech MicroFogger From An Arduino

  Posted October 28, 2023  in Internet of Things (IoT), Arduino
  

  Describes how to use an Arduino device to control the Vosentech MicroFogger.

• Glowing Pumpkin Project Refresh

  Posted August 30, 2023  in Arduino, ESP32, Internet of Things (IoT)
  

  Years ago I published a several Glowing Pumpkin projects: Arduino Glowing Pumpkin and Arduino Glowing Pumpkin (Adafruit Feather). Both projects used Arduino compatible devices plus either one of the Adafruit multi-NeoPixel devices or a NeoPixel shield. The shield approach was easy because I just had to solder some male and female headers to the boards and press them together into a unit. My first project used the NeoPixel Ring which required soldering wires and running them into an enclosure where the Arduino device resides.

• Arduino ESP32 Web Server on a Processor Core

  Posted August 27, 2023  in Internet of Things (IoT), Arduino, ESP32
  

  The second article in this series, describes in detail how to run a web server in an Arduino project on the Espressif ESP32 microcontroller.

• Arduino ESP32 Running Tasks On Multiple Cores

  Posted August 25, 2023  in Arduino, ESP32, Internet of Things (IoT)
  

  This article demonstrates how to assign different tasks to separate processor cores using the Arduino platform and multiple core microcontrollers. I always wanted to learn how to do this, but the examples on the web are so full of ads that I wanted to publish a version with no advertisements as a super clean example.

• Andy Doro Word Clock Update

  Posted August 10, 2021  in Internet of Things (IoT), Arduino
  

  I recently discovered Andy Doro's Word Clock and I love the project. I built one for my self then started looking at the code for ways to improve it. I made a bunch of changes to the code and, once Andy added a license to the project repository, forked it and published my own version of it.

• Using the Arduino NTPClient Library

  Posted July 18, 2021  in Internet of Things (IoT), Arduino
  

  I have a version of Andy Doro’s Word Clock running in my house. I had some issues with the real-time clock (RTC) keeping time correctly, so I decided to rebuild the clock using a Wi-Fi enabled device and the Network Time Protocol (NTP) to keep my clock’s local time synchronized with reality.

• Word Clock Time Issues

  Posted July 14, 2021  in Internet of Things (IoT), Arduino
  

  The clock's been running in our guest bathroom for more than a year now and I recently noticed that the clock wasn't keeping time very well. It was about 20 minutes fast. The original project is based on the Adafruit Trinket device which doesn't have a Wi-Fi connection, so it can't get it's time through Network Time Protocol (NTP). Instead, sets the clock to the compile date/time for the currently running sketch.

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Header image: Photo by Sahand Babali on Unsplash