June 24, 2026

Mini Recordion

Name: Testudo
Brand: amomii
SKU: TD01V1K
Price: 69.99 USD
Availability: InStock

by amomii Team in Testudo

Uploading the Project

If you haven't already uploaded the Mini Recordion code to your device, there are two ways to do it:

1.Use amomii Link. amomii Link is our proprietary tool for uploading code directly from our website.

Go to Mini Grand Link and choose your project. Today we’re picking Mini Recordion.
Read about the amomii Link tool.

2.Manual Installation: Go to the Toolbox, download the code and upload it to your device using the Arduino IDE (if you don't know what that means, use option one!)

Go to Toolbox.

What it Does

This project transforms your Mini Grand piano into a digital recorder and player. By using RGB lights and pitch-shifting capabilities, you can turn your Mini Grand into an instrument that records your performances into memory banks.

Getting Started: Master Mode

When you first power on the piano after uploading the code, you start in Master Mode. You’ll know you’re there because most of the light strip will glow red, except for LED 5, which glows green. From here, you have two main paths: Free Play or Record.

Practice with Free Play Mode

If you want to warm up, press KEY 5 (the one under the green light) to enter Free Play Mode. This lets you play the piano normally to practice your skills. While in this mode, you can use the POT_A0 dial to adjust the pitch. When you are finished practicing and want to go back to the main menu, press KEY 6 and 7 together.

Recording Your Performance

To start recording a sample, press KEY 6 and 7 while in Master Mode. The recording doesn’t actually start until you hit your first note. The system tracks the notes you play, how long you hold them, and the pauses in between.

There are a few things to keep in mind while recording:

The Limit: Because of memory constraints, a single recording can have a maximum of 60 key presses. If you hit that limit, it stops automatically.
Stopping: When you’re done with your sample, press Keys 6 and 7 again to finish.

Managing Your Memory Banks

Once a recording is finished, you enter Bank Mode. The lights will change: LEDs 0–3 turn blue, LED 4 is purple, LED 5 is green, and LEDs 6–7 are red.

In this mode, the first four KEYs (0–3) represent your Memory Banks.

Blinking Red Key: The bank is empty.
Solid Red Key: A sample is already saved there.

To save your new recording, simply press the bank key where you want it to go. This will either fill an empty spot or overwrite what was already there.

Other Options in Bank Mode

Before you save, you have three other choices:

Listen: Press KEY 5 (green) to hear your performance.
Delete: Press KEY 4 (purple) to scrap the recording and start fresh.
Re-record: Press KEY 6 and 7 (red) to try the performance again immediately.

Playback

After you save a sample, you return to Master Mode. You will now see solid red lights on KEYs 0–3 indicating where your saved sounds are. You can now press those keys at any time to play your samples back like a sampler.

Tags: Mini Grand projects

June 24, 2026

Tactile Push Button: Your Gateway to Interactive Electronics

Section 1: Overview & How It WorksHave you ever wondered how a simple press can bring a complex machine to life? In the world of DIY electronics, the humble tactile push button is the ultimate bridge between human touch and digital action. This tiny, clicky component is a staple for any maker starting their journey, offering a satisfying physical response whenever it is pressed.At its core, a tactile switch functions as a momentary gatekeeper for electricity. Inside the housing, a tiny, curved metallic disc sits above an open electrical circuit. When you apply pressure to the button cap, the disc deflects downward, bridging the internal contacts and allowing current to flow freely. The moment you release your finger, the metal springs back to its original shape, instantly breaking the connection.Understanding the layout of these four-pin switches is straightforward. The pins are internally connected in pairs. When you press the button, it temporarily connects the two separate pairs, completing your circuit and registering a successful input.Section 2: Real-World Use in Arduino ProjectsFor anyone diving into the Arduino ecosystem, mastering the push button is a foundational milestone. It serves as one of the most basic digital input devices, allowing you to feed external commands directly into your microcontrollers. Whether you are assembling a soldering practice kit or designing a custom interface, buttons introduce interactivity to your creations.Integrating a tactile switch into your electronics projects opens up endless possibilities for hands-on learning. Here are two practical ways hobbyists utilize this versatile component: Mode Selectors and Toggles: You can program your microcontroller to cycle through different software states with each press. A single button can turn an LED on and off, change the flashing pattern of a light display, or switch between different sensor modes in a DIY weather station. Custom Gaming Controllers: By pairing multiple tactile switches together on a practice kit circuit board, you can build your own retro gamepad. Each button press can send a unique command to your computer, turning your hardware build into a functional controller for simple games. Navigating the mechanics of hardware input is a rewarding step for any beginner-friendly STEM program. By mastering this single component, you unlock the ability to make your projects truly responsive to the physical world.See It in the Testudo KitEvery component in this guide is part of the Testudo soldering practice kit — a hands-on way to learn electronics, soldering, and Arduino coding from the ground up.

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June 24, 2026

Potentiometer: Your Dial for Precision Control

Section 1: Overview & How It Works Have you ever wondered how the volume knob on an old stereo works? Or how a dimmer switch smoothly adjusts the brightness of a room? The unsung hero behind these everyday actions is a simple electronics component known as the rotary potentiometer. At its core, a potentiometer is a variable resistor that allows manual control over the flow of electrical current. Inside the component sits a resistive track and a tiny sliding contact called a wiper. As you turn the physical shaft, the wiper moves along the track, altering the distance the electricity must travel. A longer path creates higher resistance, while a shorter path creates less resistance. This mechanical shift directly translates to a variable voltage output. For a maker diving into hardware, understanding this component opens up endless possibilities for physical interaction. It bridges the gap between mechanical movement and digital control. When integrating one into a practice kit, proper soldering ensures a reliable connection. Hand soldering the three terminals onto a circuit board is an excellent way to refine your technique, as the pins are spaced perfectly for a standard soldering practice session. Section 2: Real-World Use in Arduino Projects In the maker community, the potentiometer is a staple component for any beginner-friendly DIY project. Because microcontroller platforms read changing voltages, this component serves as an intuitive analog input device. It allows you to feed real-time human interaction directly into your code. Here are two classic ways to use a potentiometer in your next Arduino project: LED Brightness and Speed Control: By connecting the component to an analog input pin, you can map the position of the knob to control the blinking speed of an LED. Alternatively, you can use it to smoothly dim or brighten a light, mimicking a real-world dimmer switch. Audio and Servo Motor Control: You can use the knob to position a small servo motor precisely between 0 and 180 degrees. This setup is frequently used in robotics to control mechanical arms, steering mechanisms, or even to adjust audio volume levels in custom-built speaker systems. Whether you are assembling a basic soldering practice kit or designing an intricate STEAM learning layout, mastering this component is a fundamental milestone. It provides an immediate, tactile way to see your code interact with the physical world. See It in the Testudo Kit Every component in this guide is part of the Testudo soldering practice kit — a hands-on way to learn electronics, soldering, and Arduino coding from the ground up.

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LED — component photo from the amomii Testudo kit

June 24, 2026

LED: Light Up Your Electronics Projects

Section 1: Overview & How It WorksHave you ever wondered what makes the tiny indicator lights on your favorite gadgets glow? Meet the Light Emitting Diode, or LED for short. Unlike traditional incandescent light bulbs that use a fragile filament, an LED is a solid-state semiconductor component designed to convert electrical energy directly into visible light efficiently.At the heart of every LED is a tiny chip made from materials like Aluminum Gallium Indium Phosphide. When an electrical current passes through this material in the forward direction, electrons release energy in the form of photons. This process produces a bright, clean illumination without wasting energy as heat. Because they require very little power and are incredibly robust, they are a staple in almost every electronics project.When working on a DIY soldering practice kit, understanding orientation is crucial. LEDs are polarized, meaning electricity can only flow through them in one direction. They feature a longer leg, called the anode, which connects to the positive side of your circuit. The shorter leg, known as the cathode, connects to the negative side. Reversing this orientation will not damage the component under low voltages, but it will prevent the light from turning on.Section 2: Real-World Use in Arduino ProjectsFor anyone diving into the maker community, the humble LED is almost always the starting point for learning hardware interaction. It provides immediate visual feedback, allowing you to confirm that your circuit design and programming logic are functioning correctly.Within the Arduino ecosystem, an LED serves as an ideal output component for beginner-friendly STEM and STEAM applications. For instance, you can integrate one into a smart home system where a motion sensor triggers the light to turn on automatically. Another classic project involves building a countdown timer or a visual indicator for a temperature monitoring system, where the light changes states based on environment data.Because these components are highly sensitive to current, they are typically paired with a small resistor in series to prevent them from drawing too much power. Whether you are learning soldering for the first time or prototyping an interactive gadget, mastering this versatile component opens the door to countless creative possibilities in electronics.See It in the Testudo KitEvery component in this guide is part of the Testudo soldering practice kit — a hands-on way to learn electronics, soldering, and Arduino coding from the ground up.

Learn more