It is necessary to develop a schematic diagram and printed circuit board based on the ESP32 WROOM controller for ordering ready-made boards from China with soldered components.

Main requirements:

1. Functionality of the board

Power supply:
- Use a 18650 battery as the power source.
- Implement a battery charging module using TP4056 (or a similar module) with protection against over-discharge and over-charge.
- Voltage stabilization of 3.3 V to power the ESP32 and peripheral devices through a DC-DC Buck Converter (for example, MP1584 or similar) to ensure high energy efficiency.
- Provide power stabilization with an output current of up to 1 A.
Indication:
- LEDs to display the charging status and full charge of the battery.
- Implement the ability to measure the battery charge level through the ESP32 ADC (using a voltage divider).
Type-C connector:
- For charging the battery.
- For programming the ESP32 (via USB-UART converter, for example, CP2102 or CH340).
Peripheral connection:
- Two SPI interfaces to connect to two boards with AS5048A sensors via flat cables.
- UART connector with power +3.3 V, 250 mA.
Inclination sensor:
- Integrate an inclination level sensor (for example, MPU-6050 or similar) to measure the tilt angles of the board.

2. Requirements for the printed circuit board

Develop a schematic diagram of the device.
Perform the layout of components on the board considering the specified dimensions and connector placements (details will be provided after discussion).
Use DipTrace for schematic design and board routing.
Provide points for signal testing (Test Points) on the board.

3. Additionally

Develop two separate boards for AS5048A sensors with a connection interface via SPI ribbon (one sensor per board).
Specify the requirements for the minimum sizes of these boards.

Work results:

Schematic diagram of the device in PDF format and source files in DipTrace, KiCad, Altium Designer.
Gerber files for ordering the main board and sensor boards in production.
List of used components (BOM) for each board.
3D model of the printed circuit board (if possible).
Recommendations for ordering ready-made boards from China with soldered components.

If there are any questions or suggestions for optimization, I am ready to discuss. I look forward to your responses and proposals.

Proposals 3 Discussions 4

Please select

Aleksandr A.

Winning proposal

51 0

Budget: 6000 UAH Deadline: 3 days

Good day.
I can do it in about three days if the fee is not of high complexity. If I need to "tighten up" a lot, then 4-5 days. I work in KiCAD and AD.

Valery Romanov

3 0

Budget: 6000 UAH Deadline: 7 days

I will design all the necessary files for the production of boards and their assembly.

I can do this job. I work with Diptrace without any problems, and I don't see any issues with the components either. The only thing is - I would use AMS1117-3.3 for power supply and wouldn't bother with switching regulators, as there is no advantage to them in this case.

Yurii Bondarenko 27 January 2025

можно уточнение? нужен ли ШИМ понижайка с аккумулятора до 3.3В?
например MP1584 работает от 4,5В, тоесть один аккумулятор не подойдет, надо два последовательно, но по логике должно хватать 1 аккумулятора и линейного стабилизатора, это будет дешевле в разы, надежнее и меньше аккумуляторов, КПД стабилизатора конечно будет меньше, примерно на 20%, но вот и все минусы

Dmitry Pan

27 January 2025

Добрый вечер.
Да, конечно можно все упростить. Схему питания и зарядки можно выполнить аналогично повышающему модулю https://www.alibaba.com/product-detail/3-7V-To-9V-5V-2A_1601157216003.html?spm=a2756.order-detail-ta-ta-b.0.0.3e01f19cHYbOEA

Dmitry Pan

27 January 2025

Ну и добавить, конечно, AMS1117 на 3,3В

Dmitry Pan

27 January 2025

Ну и добавить, конечно, AMS1117 на 3,3В

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