Setup the Arduino IDE

Software and Prerequisites

Arduino IDE 1.6.4 or later
Working internet connection

Installation Steps

First, we need to download the Arduino IDE, which can be done from the Arduino Software page.
Install the Arduino IDE on your local machine.
Open the Arduino IDE.
Navigate to Preferences
- File > Preferences (Windows/Linux)
- Arduino > Preferences (macOS)
Add Custom Board Manager URL
- In “Additional Board Manager URLs” field, paste: https://raw.githubusercontent.com/Mister-Industries/arduino-board-index/refs/heads/main/package_tiny_core_index.json
For multiple URLs, separate with commas
Open Board Manager
- Tools > Board > Boards Manager
- Or press the Boards Manager Icon on the left menu:
Install ESP32 Boards/Tools
- Search for esp32
- Select esp32 package (v3.1.1) by Espressif
- Click “Install”
Install tinyCore Custom Board
- Search for tinyCore
- Select tinyCore ESP32 Boards package (v2.0.0) by MR.INDUSTRIES
- Click “Install”
Plug in your tinyCore via the included USB-C Cable!
Under the devices tab, you should see a new device appear. Click Select other board and port...
Search “tinyCore” and select tinyCore ESP32-S3 No PSRAM and click on the COM Port of the new device. Click OK.
Now, open the Blink Example by navigating to File -> Examples -> 01.Basics -> Blink
Under Tools, make sure that:
- Upload Mode is set to UART0 / Hardware CDC
- USB Mode is set to Hardware CDC and JTAG
Click Upload!

The code should compile and you should see the device flash and hard reset.

The SIG LED should now be blinking once every second!