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Fun with the Color Kit Grande: Building a Simple Calculator with ESP32

Color Kit Grande Calculator

We’re always excited to see how the community leverages the capabilities of the Color Kit Grande, and today, we’re sharing something a little different—a fun and practical project: a simple calculator using an ESP32! Inspired by the versatility of the Color Kit Grande’s colorful display and ESP32 power, we’ve built a handy tool that you can easily replicate or expand on.

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Using The Color Kit Grande With ESPHome and HomeAssistant

The Color Kit Grande is more than just a simple starter kit for home automation. This kit, which includes an ESP32, a capacitive touch screen, and options for a LiPo battery and 3D-printed enclosure, provides an incredible foundation for building interactive and portable smart home interfaces. When paired with ESPHome and Home Assistant, the Color Kit Grande can control lights, shutters, and other devices, while also displaying real-time data such as temperature, right on its touchscreen.

In this blog post, we’ll explore how the Color Kit Grande integrates with ESPHome and Home Assistant and walk you through the YAML configuration that powers it.

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Overcoming Design Challenges: The Touch Button Solution for the Pendrive S3

Pendrive S3

How can you add a button to a device without drilling a hole in its enclosure? This was the challenge I faced when designing the Pendrive S3, as I wanted to use an off-the-shelf USB enclosure. Drilling a hole was an option, but I aimed for the Pendrive S3 to resemble a regular USB stick without any conspicuous buttons altering its exterior.

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Spicy Prototypes: ESP32-S3 Pendrive

ThingPulse ESP32-S3 Pendrive

The ESP32 family of chips never ceases to impress; with just a few lines of code, you can turn an ESP32-S3 board into a WiFi dongle, connecting a host computer to WiFi via USB. Or you can run a script to infiltrate a target computer. Additionally, you can turn it into a memory stick with a WiFi interface.

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Microsoft Teams presence on Icon64

Microsoft Teams presence on Icon64 placed on living room sideboard

Displaying your Microsoft Teams presence on Icon64, the ThingPulse LED matrix device, is a great way to let others around you know whether you are available or whether they would be interrupting your meeting.

We are pleased to announce a brand-new app for the Icon64 that allows you to broadcast your Microsoft Teams presence to

  • your family or flat-mates in the home office
  • your co-workers at the office

Use the coupon code ‘icon64-ms-teams’ to get 30% off the Icon64!

Just like Zoom an others, Microsoft 365 family member “Teams” offers a traffic-light style presence to announce your availability . You are either available, busy, away or offline (for real or fake). There are over a dozen different detail states but the traffic-light is usually what counts. Our Icon64 app does exactly this: mapping your presence to the three colors green, yellow, and red.

For once, we did not have to start from scratch when we set out to implement a new app for the Icon64. Instead, we forked the ESPTeamsPresence project by German maker Tobias Blum. While he 3D-printed the case for the electronics, we already had a device. Hence, we only needed to port the software. Thanks to ESPTeamsPresence’s modern foundation – Tobias used PlatformIO – and well-structured code, porting it to the Icon64 was fairly simple. However, while Tobias mapped the Microsoft Teams presence to eleven different color & animation combinations, we opted for sticking to the traffic-light. We felt that your family or co-workers should not have to remember all those eleven combinations to understand how available you are.

A note on security

Your Teams presence is not publicly available, it shouldn’t be. You need to grant the Icon64 presence app permission to access this information. You do so in a simple guided workflow in the browser. It is all described in our documentation. As you will most likely do this in the context of an organization that grants you access to Teams such as your employer or your school, they might want to have a say in this as well.

On the Microsoft side the device is represented by an Azure “application”. It is not an application in a traditional sense (source code and stuff) but a security element for consent management. The application manages the data privileges your device has. It needs access your profile and presence data – and nothing else. You can either use the multi-tenant application Tobias Blum set up, which is the default, or register your own application. Which ever way it is, your organization might have to whitelist that application. The authorization workflow cannot be completed otherwise.

Microsoft Teams presence on Icon64 placed next to home-office door
Place the Icon64 next to your home-office door to communicate to your partner or family whether you are available.
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USB Settings for Logging with the ESP32-S3 in PlatformIO

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The ESP32-S3 is endowed with two noteworthy USB features that its predecessor, the original ESP32, lacked: USB OTG and USB CDC/JTAG. This blog post delves into the platformio.ini settings that govern the USB behavior of the ESP32-S3, with a particular focus on logging in CDC/JTAG mode.

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