Ordering Components

n order to properly start the development of the device, I need to order all the required components, therefore, the following list has been created.

Components already ordered for the prototype developement:

1. Arduino Pro Mini = The Arduino Pro Mini is a microcontroller board based on the ATmega328. It has 14 digital input/output pins (of which 6 can be used as PWM outputs)and 6 analog inputs. It also supports I2C and SPI interfaces for sensor communication. The 3.3v version of this board has been taken.

2. Voice Recognition Module V3 (by Elechouse) = Speaker-dependent voice recognition module. It supports up to 80 voice commands with a maximum of 7 voice commands at the same time. Any sound could be trained as a command.

3. DFRobot DFPlayer = A module that can use a MicroSD card (up to 64GB, FAT32 format), to output wav sounds/files to a speaker connected directly to the board, passing through an available amplifier.

4. EEMB 3.7V Lipo Battery 320mAh = 1 cell LiPo battery 320mAh, weight: approximate 6g; Size: 25.5 x 36 x 4.3mm/1"x1.41"x0.17" (WxLxH). Max charge 4.2 volts.

5. Speaker 8ohm 1.5watts = mini speaker used to output the voice files available on the microSD. The speaker may be changed later for something more powerful and smaller.

Components ordered this week:

• Nicla Sense ME: The Nicla Sense ME is a tiny, low-power tool that sets a new standard for intelligent sensing solutions. With the simplicity of integration and scalability of the Arduino ecosystem, the board combines four state-of-the-art sensors from Bosch Sensortec:

  • IMU (Accelerometer and Gyroscope)

  • Magnetometer

  • Pressure sensor

  • VOC/VOOs gases

  • Pressure

  • Humidity

  • Temperature

  • Bluetooth 4.2

Datasheet: https://docs.arduino.cc/resources/datasheets/ABX00050-datasheet.pdf?_gl=1*6zb7n4*_ga*NTU3OTkxMjk2LjE2MzM1MTEzODA.*_ga_NEXN8H46L5*MTY0MzQ3NjIwMi4yMC4xLjE2NDM0NzYyMDIuMA

• DFRobot Gravity SEN0203:

  • SpO2

  • Heart Rate (BMP)

Datasheet: https://wiki.dfrobot.com/Heart_Rate_Sensor_SKU__SEN0203

• Adafruit 2716 Silicon MEMS Microphone Breakout - SPW2430:

  • Noise Levels

  • Other output that may be possible with a microphone (yet to develop)

• Adafruit 1777 SI1145 Digital UV Index / IR / Visible Light Sensor I2C

  • Infrared Light

  • UV light

  • Visible Light

  • UV Index Report

Datasheet: https://cdn-shop.adafruit.com/datasheets/Si1145-46-47.pdf

• MLX90614 Sensor:

  • Infrared Distance Temperature (To be used for measuring the wearer's skin temperature and deduct any outputs, such as a fever).

Datasheet: https://www.electronics-lab.com/project/infrared-thermometer-arduino-mlx90614-temperature-sensor/

Concluding notes:

• The total cost for all the components is circa £150.

• The delivery of the new components should be before the 7th of February (within a week).

• The speaker, as mentioned, may need to be changed with something smaller and more powerful.

• Furthermore, a specific external amplifier may be used outside of the one present on the DFRobot DFPlayer module.

• At the current moment no other sensors are required. However, material such as brass(CNC), aluminium (Waterjet), resin (3D Printing) are still required, but will be discussed at a later stage.

EDIT 31/01/2022: Components have all been shipped and are expected by the 2nd/3rd of February.