Hello!
Based on the ideas of my project, Smart Exhibit, and the capabilities of the Arduino Nano 33 IoT board, I decided to use the following additional components:
- Temperature, humidity, proximity, light and IMU sensors - Used for collecting information about the environment where the exhibit is placed
- A microphone module and a speaker - Used by the visitors for asking questions and getting answers back (will be used together with AWS Alexa Voice Service)
- A power supply based on a battery and a charger for it - Used for providing the necessary energy for the device to run without being connected permanently to a wired power source.
The choices for each of these additional hardware components, some useful observations and the connection way to the Arduino board are shown in the table below.
| Component | Type | Observations | Connection with Arduino Nano 33 IoT |
|---|---|---|---|
| Temperature Sensor | DHT11 | Together with the Humidity Sensor in the same module | Digital input |
| Humidity Sensor | (see above) | (see above) | (see above) |
| Proximity Sensor | HC-SR501 | - | Digital input |
| Light Sensor | BH1750 | The light intensity provided value is in Lux (some other light sensors which I was considering were providing a proportional value with the light intensity but not the actual value in Lux) | I2C connection |
| IMU Sensor | LSM6DS3 | Included in the Arduino Nano 33 IoT board | I2C connection |
| Speaker | 0.25W, 8Ohm | - | Digital output (with PWM) |
| Microphone | MAX9814 CMA-4544PF-W | Microphone and MAX9814 Amplifier | Analogue input |
| Battery charger | TP4056 | Li-Ion battery charger module with battery protection | VIN and GND |
| Battery | LiPo 3.7V 1500 mAh | - | - |
I already ordered these components, so I am looking forward to testing them and to playing with them together with the Arduino Nano 33 IoT board 