Our project consists of three main components:
- TM4C123GH6PM microcontroller
- RC1602E character LCD
- Ublox NEO-6m GPS Module
| GPS module PINS | TM4C123 GPIO PINS |
|---|---|
| VCC | 3.3V |
| GND | GND |
| TX | PB0(uart1_RX) |
| LCD PINS | TM4C123 GPIO PINS | |
|---|---|---|
| LCD Control | RS | PE1 |
| LCD Control | RW | PE2 |
| LCD Control | E | PE3 |
| LCD Data | D7 | PD3 |
| LCD Data | D6 | PD2 |
| LCD Data | D5 | PD1 |
| LCD Data | D4 | PD0 |
| Power | VSS | GND |
| Power | VDD | VBUS |
| Power | VO | Potentiometer out |
| Power | A | VBUS |
| Power | K | GND |
The system goes through various states throughout its lifetime
-
Getting the destination location through UART0 which is connected to the laptop.
- The user enters the latitude and longitude of the desired destination.
- "Enter the destination" on the LCD to indicate we are in this state.
-
Searching state
- The GPS searches for nearest satellites to read accurate locations.
- It usually takes around 1min and it could last longer if we were in a closed place.
- “Searching For satellites” on the lcd and Blue led indicate we are in the searching state.
-
Ready state
- We enter the Ready state after the GPS has initialized correctly and we can get readings now.
- We should push SW1 to exits this state and start moving.
- “GPS Ready Sw1 to start” on the lcd and purple led to indicate we are in the Ready state.
-
Reading state
- When we are moving, and the distance is being accumulated.
- the distance we have moved would appear on lcd.
- Led color depends on how far we are from the destination.
-
Destination is far state.
- Red LED means we are more than 5 meters away from the destination.
-
Reaching state
- Yellow LED to indicate we are less than 5 meters away from the destination.
-
Destination Reached state.
- Green LED to indicate we reached the destination.
- "Destination Reached" on the LCD for 5 second.
- The total distance we traveled is shown on the LCD then the program ends.
-
Error state
- White LED to indicate there is an error.