Updates

Update: 3/20/2020

The project has been completed up to the base functionalities (See project demo video: youtu.be/YYclaDwrQq0). The state diagram has been updated to match the current model used in the code, and some pictures of the final product has been added.

In the coming months, I may come back to this project and add or change functionalities, such as changing the method of tracking people within the room to GPS using a GPS module, rather than relying on the combination of the ultrasonic and IR sensors. This would mean that visitors would not be considered, making it less useful for common areas like the living room, but for a private space like a bedroom, it would likely be more convenient. I will keep adding updates whenever I work on the project.

Update: 3/12/2020

Finished soldering light sensor pins, as well as extending the wires for all of the components that needed extensions. I also finished all of the coding for the initialization of the GPIO pins, as well as for the RTC clock. I will need to check which clock I will be using for the system clock, but I will likely end up using the default.

While beginning to translate my main function pseudocode into actual code, new potential problems arose, such as the possibility of a person flipping the light switch manually. I decided to fix this issues by combining the "lightlv" variable with the "light" variable (see state machine from previous update), and making the light sensor check if enough light is in the room whenever movement is found by the IR sensor.
Another issue I thought of, was if the RTC clock became off from the real time (due to power outage, or pressing the reset switch on the STM32, etc.). I fixed this temporarily by removing the RTC clock display, changing the clock to a purely internal clock that only uses the time as a reference, as well as setting the time upon the reset button being pressed to 6 PM. I chose 6 PM as the reset time, because only time you would notice that the RTC was off would be if the room became dark after sunset, and the light never turned on, upon which you could now press the reset switch, and the project would begin checking for sunset 2 hours before the room gets too dark starting the next day. For a longer term solution, however, I would like to implement a time correction/editing system using the bluetooth connection.

Update: 3/5/2020

I finished configuring initialization for the GPIO pins in the code. Attempted to test servo functionality again, but realized the servo I wanted to use was attempting to pull too much current while it was powered on, so I will need to procure an external power source, likely using batteries. Will need to solder on the pins for the light sensor, but other than that, the wiring for the project is finished temporarily (ready to be tested). The wiring will need to be redone for the final product to clean it up and extend the wire length for certain sensors. While a bit difficult to tell from the image, each of the GPIO pins have been mapped to the specific functions as follows :

• PE8 - TIM1_CH1N (servo motor control PWM signal)

• PA0 - TIM5_CH1 (ultrasonic sensor echo input capture)

• PA5 - TIM8_CH1N (ultrasonic sensor trigger PWM signal)

• PA1 - GPIO Input (IR sensor output receiver)

• PA2 - USART2_TX (bluetooth module TX pin)

• PA3 - USART2_RX (bluetooth module RX pin)

• PB6 - I2C1_SCL (light sensor SCL line)

• PB7 - I2C1_SDA (light sensor SDA line)

Outside of this, all of the components have been wired to share the same ground, as well as receiving output from the 5V output of the STM32 board. However, since the board was indicating current overflow error, I will power some of the components (primarily the servo motor) using an external battery. In addition, I will likely end up adding extra IR sensors later on after testing the project in full using the single sensor for now.

Update: 2/27/2020