Modular Pressure Sensor Matrix PCBA

**GENERIC BIDS WILL NOT BE CONSIDERED**

Include in your proposal:

-expected MCU to use

This is Part 1 in a large project, the successful Freelancer will be asked to join on multiple contracts if performance on Part 1 is to a good standard.

Most of this project can be replicated through a circuit design diagram that we will provide to promising freelancer bids.

This project is for the design of a MODULAR large pressure sensor matrix PCB and requires the freelancer to develop a working PCBA, test it and deliver to our office. The pressure matrix is arranged in a grid formation, where one layer has vertical lines and the bottom layer has horizontal lines. By scrolling through each line very quickly we can determine the exact pressure positions on the sensor mat. We have used multiplexers and , diodes and switches in the past to achieve this function and it worked really well so we suggest the freelancer to use a similar method. Voltage dividers also help give the matrix a wide sensing range..

We have our own sensor mat prepared so the freelancer does not need to make the mat but should perform testing with off the shelf FSR to ensure the PCB works as desired.

The PCB should also include circuitry for 6 DC vibration motor drivers which operate at 3V. The microcontroller used should have very fast processing speed to allow for quick scanning of the 1800+ sensor points. Arduino or similar programming language is preferred so we can make edits in future.

Design Requirements:

-A module for playing simple sounds (buzzer or similar)

-MODULAR pressure sensor input so we can use the same PCB with different number of rows and columns of sensor lines. Vertical input (columns) up to 100 inputs and Horizontal input (rows) up to 100 inputs. But the pressure sensor circuit should work with any combination of columns and rows.

-Analog reading of pressure sensor should be used, use of a voltage divider or similar circuit is recommended, diodes for circuit protection

-Very fast based processor and MCU

-6X vibration motor driver circuit to control 6 DC coin type motors operating at 3V

-Lipo 3.7V or 7.4V battery power, also power through USB-C when connected

-Fast recharging rate via micro-usb or USB-C

-Wired and Wireless mode - BLE (wireless) or USB-C (wired to PC)

-BLE (Bluetooth Low Energy) for communicating sensor values to a PC or phone

-USB-C to USB or data interface to plug PCB directly to a PC for reading the values (when BLE is not used)

-Should include power button or ON/OFF switch to turn the PCB ON/OFF

-RGB Led for status indication, i.e. Blue LED means ON, Green LED means charging battery, Red LED means low battery, Purple LED means ON and Connected (BLE).

-Green Led to indicate charging

-Basic speaker/buzzer model to create good quality sounds/chimes (think pokeball plus/ps4 controller)

The freelancer is not expected to do much coding, only to test the circuit elements and features. The code is also to mainly ensure the pressure sensor matrix and power circuits are working correctly.

THE FREELANCER MUST USE EAGLE COMPATIBLE FILES

Project Deliverables:

1) PCB Eagle Schematic Files, BRD files, Gerber Files, BOM, X-Y pick and place, Code

2) Video of working PCB with testing

3) PCBA delivered to our office

Electrónica Microcontrolador Ingeniería eléctrica Diseño PCB Diseño de circuitos

Nº del proyecto: #28130089

Sobre el proyecto