API

Team Bytes

Byte	Function
AZ	Start
YB	Stop

Unique ID	Byte
Shon Ha	h
Maximus Mathews	m
Rohan Fernandez	f
Shelton Larance	l

Messages Sent

Message Type 2 (Light Readings from Optical Sensor)

Received and Forwarded to MQTT

	Byte 1-2	Byte 3-6	Byte 7-8	Byte 9-12
Variable Name	sensor_one	L1_Reading	sensor_two	L2_Reading
Variable Type	char	char	char	char
Min Value	S1	0000	S2	0000
Max Value	S1	9999	S2	9999
Example	S1	3567	S2	2343

Messages Received

Message Type 1 (Wifi Toggle - Auto/Manual)

Used to toggle stepper motor functionality from automatic (state 0) to manual (state 1).

	Byte 1	Byte 2
Variable Name	mode	mode_toggle
Variable Type	char	char
Min Value	M	0
Max Value	M	1
Example	M	1

Message Type 2 (Optical Sensor Readings)

Used to determine where the stepper motor will rotate, facing the solar panel towards the highest light level detected by the optical sensors. Bytes 1-2 act as an identifier, allowing the stepper motor to determine which way to face once all four readings have been sent.

	Byte 1-2	Byte 3-6	Byte 7-8	Byte 9-12
Variable Name	sensor_one	L1_Reading	sensor_two	L2_Reading
Variable Type	char	char	char	char
Min Value	S1	0000	S2	0000
Max Value	S1	9999	S2	9999
Example	S1	3567	S2	2343

Message Type 4 (Button - digital signal)

Used to manually control stepper motors from left to right. It has two states (0) and (1) to determine if the button has been pressed.

	Byte 1	Byte 2	Byte 3	Byte 4
Variable Name	left_button	button_left_toggle	right_buttom	button_right_toggle
Variable Type	char	char	char	char
Min Value	L	0	R	0
Max Value	L	1	R	1
Example	L	1	R	0

Message Handling Process Flow

Example Messages

	Message
Received	AZmhMOS13452S27865L1R0YB
Sent	AZhlS12313S28745YB
### Messages Received

flowchart TD
    A[UART Message Received] --> B{Break down messages based upon message types}
    B --> |Message Type #4|K
    B --> |For Message Type #1| D{Read Message Type} -->|Automatic| G[State 0] 
    D -->|Manual| J[State 1]
    B -->|For Message Type #2| E{Compare two readings and store into array} -->|Highest Reading| H[Rotate Stepper motor towards direction]
    E-->|Lowest Readings|L[Trash messages]
    J -->  K{Control Motor with Two Buttons}
    K --> |Left Button| C[Turn Stepper Motor CW]
    K --> |Right Button| M[Turn Stepper Motor CCW]