Building the new "Smol Slime" trackers with JLCPCB #444

Introduction

In this tutorial, we will guide you through the process of building the "Smol Slime" trackers using JLCPCB. This project is a great introduction to PCB manufacturing and embedded systems, ideal for DIY enthusiasts and developers looking to create reliable devices. We will cover the necessary components, assembly instructions, firmware setup, and testing procedures.

Step 1: Gather Required Components

Before starting the build, ensure you have all the necessary components:

• ICM-45686 IMU: This inertial measurement unit is essential for tracking motion.
• Tenstar NRF52840 Microcontroller: This microcontroller provides Bluetooth connectivity.
• 3.7V 301730 Cell: A rechargeable battery for power.
• MSK-12-C02 Slide Switch: For power control.
• 3.6x6mm Button: For user input.

You can find these components through the following links (note that they may expire):

• ICM-45686 IMU
• Tenstar NRF52840 Microcontroller
• 3.7V 301730 Cell
• MSK-12-C02 Slide Switch
• 3.6x6mm Button

Step 2: PCB Design and Manufacturing

1. Design your PCB: Use PCB design software to create your board layout, incorporating the components listed above.
2. Upload to JLCPCB: Once your design is complete, visit JLCPCB to upload your files for manufacturing.
3. Select your options: Choose the quantity, color, and other specifications for your PCB.
4. Place your order: After confirming all details, place your order and wait for your PCBs to arrive.

Step 3: Assemble the Components

1. Prepare your workspace: Ensure you have a clean and well-lit area to work in.
2. Solder components:
   • Start with the smallest components (like resistors) and work your way to larger ones (like connectors).
   • Use a soldering iron to melt solder onto the pads while placing the components in their respective positions.
3. Check connections: After soldering, inspect each connection to ensure there are no shorts or cold solder joints.

Step 4: Firmware Setup

1. Download firmware: Access the firmware source from the documentation linked in the video description.
2. Install necessary tools: Ensure you have the required software for flashing the firmware onto the NRF52840.
3. Flash the firmware: Follow these steps:
   • Connect your device to your computer.
   • Use the flashing tool to upload the firmware to the microcontroller.

Step 5: Testing the Device

1. Power on your tracker: Use the slide switch to turn on the device.
2. Connect to a mobile device: Utilize the nRF Connect app to establish a connection and test functionalities.
3. Check sensor readings: Verify that the IMU is providing accurate motion data.

Conclusion

You've now successfully built and tested your "Smol Slime" tracker. This project not only enhances your understanding of PCB manufacturing and embedded systems but also provides a foundational device for further exploration in IoT and robotics. Consider experimenting with additional features or creating multiple units to expand your project. Happy building!