⬇️ The project has the spiritual support of NTKA 💌 aka honey ⬇️
- Overview about this project, this device measures the noise/sound level thourgh sound sensor (Simple) to give a warning (Text/LED !Not Any Sound) and use Wifi to send data to Cloud Server for Dashboard Management.
- In AWS, I use the service EC2 for deploy Server and DynamoDB for storing and querying data.
- This is the perfect combination of embedded systems, electronic circuits and IT.
- I just focus on Hardware and Firmware in this section description.
This device uses STM32F103C8T6 for MCU and ESP12F for Wireless Connection. ESP12F is the main factor of this description and helps STM32F103 connect Internet to send or recevive through HTTP protocol. The photo below is a combination of the components together. Additionally, it use MAX4466(Sensor Microphone) which has amplifier to measure sound around in the environment. To know which level is called "Noise" , it depends on the level and threshold you want to config (Depend on your option)
| STM32F1 | ESP12F | DS3231 | MAX4466 | Description |
|---|---|---|---|---|
| 3.3V | VCC | VCC | VCC | Power supply (3.3V) |
| GND | GND | GND | GND | Ground |
| PB6 (I2C1_SCL) | - | SCL | - | I2C Clock |
| PB7 (I2C1_SDA) | - | SDA | - | I2C Data |
| PA9 (USART1_TX) | RXD | - | - | UART Transmit |
| PA10 (USART1_RX) | TXD | - | - | UART Receive |
| PA0 (ADC_IN0) | - | - | OUT | Audio input from MAX4466 |
- STM32F1: Uses PB6 and PB7 for I2C communication with DS3231 (real-time clock). PA9 and PA10 are used for UART communication with ESP12F (Wi-Fi module). PA0 is used for analog input from the MAX4466 (microphone amplifier).
- ESP12F: Communicates with STM32F1 via UART using TXD and RXD.
- DS3231: Real-time clock module uses I2C communication with STM32F1.
- MAX4466: Outputs audio signal to STM32F1’s ADC pin (PA0).
The pictures show the schematic and hardware board of the WiFi module, respectively on the left and right.
⚠️ Important: You need to use an external 3.3V power source.
The ESP12F has three different boot modes selected by the state of GPIO15, GPIO0, and GPIO2 at start-up.
| MODE | GPIO_15 | GPIO_0 | GPIO_2 |
|---|---|---|---|
| SDIO (Boot SD Card) | 1 | x | x |
| UART (Upload Code) | 0 | 0 | x or 1 |
| FLASH (Normal Running) | 0 | x or 1 | x or 1 |
- Sign "x or 1" must be left either floating or pulled up to 3.3V.
- The "chip enable" (EN/CH_PD) pin has to be pulled up to 3.3V. Otherwise, the ESP12F will not run.
//TODO: Update earlier in future
- First time, i run my server NodeJS in local but it must have same Wifi Connection (I dont want that). So, i use AWS EC2 to deploy this local server to cloud server which can overcome the problem of not working everywhere. (Dasboard Website/App).
- In this section, i just do add this parameter to file
.env
AWS_ACCESS_KEY_ID=XXXXXXXXXXXXXBCDEFGHIK.
AWS_SECRET_ACCESS_KEY=XXXXXXXXXXXXXBCDEFGHIK132323232132132.
AWS_REGION=your-region.
EXPRESSPORT=your-port.
