Make Guide
Source Code
3d Model
PCB
Materials
- PCB board thickness: 1.0mm, black solder mask, manufactured by JLCPCB;
- Panel manufactured by LCSC Mall, parameters: 1.0mm semi-transparent black acrylic with strong light shielding, no back adhesive, to be glued together later;
- Light diffuser material: PET LGT075J, no back adhesive, to be glued together later;
- LED: WS2812B 0807 (1.7x2.0x0.85mm)
- Battery: 213455 500mAh. (21mm × 34mm × 55mm)
- Hardware: M2×3×3.2 knurled nut, M2×4 hex screw.
- GPS: ATGM336H 5N71 module + antenna (13.1mm × 15.7mm).
- QMC5883L has been discontinued, now supports QMC5883P, and the firmware will automatically recognize it
Q&A
December 02, 2024
Q: How long does GPS positioning take?
A: According to the Taobao product description and actual tests, the first positioning takes more than 30 seconds.
Q: According to the LED datasheet in the project schematic, the operating voltage should be 3.5V~5.5V, but the schematic actually uses an LDO 3.3V output as the power supply.
A: This is a design error. From the actual working situation, no serious problems have been shown yet. If there is a plan for a second version, this design will be fixed.
June 11, 2025
Q: No response when plugged into the computer after production.
A:
Check if the switch is turned on; flipping it upward is the on state.
Check if the ESP32-C3 is soldered successfully. You can remove the chip, face the back upward, and check if any pins are not tinned.
- The one in the picture just had no solder on D-, causing failure to connect to the computer. In this case, manually add solder to the module.
- The one in the picture just had no solder on D-, causing failure to connect to the computer. In this case, manually add solder to the module.
Check if the LDO output is normal.
Check if the LEDs are oriented incorrectly.
Q: After production, when plugged into the computer, the Device Manager keeps refreshing.
A: A new ESP32-C3 without firmware will keep reporting Flash errors and restart continuously, thus losing the USB connection. Just flash the firmware directly.
Q: No response during flashing.
A: Please confirm whether the firmware is checked. 
Q: LEDs stop lighting up from a certain point.
A: Check the soldering of the last working LED and the first non-working LED.
Q: 'X4' are displayed after powering on.
A: Check the soldering of the geomagnetic sensor and whether the geomagnetic sensor model is correct.
Q: QMC5883L is discontinued and unavailable.
A: It can be replaced with QMC5883P, and the firmware already supports it.