Logical Line Follower
A line follower bot, made without any microcontrollers
Why?
The project is being made as an educational project. I am building it to gain hands-on experience with digital electronics and embedded systems.
What’s new?
Almost all line follower projects use a microcontroller, namely the Arduino. I have already done that, now I am making a line follower bot that doesn’t use an Arduino or any other microcontrollers, but instead it uses a custom logic circuit made using the 74XX IC Series
The ICs being used
| IC no. | IC name |
|---|---|
| 7404 | HEX INVERTER |
| 7408 | QUAD 2-INPUT AND |
| 555 | 555 Timer IC |
555-bistable 5-bit memory for storing the current state of the bot
Next I will make a Control Unit using Inverters and diodes.
The 5 states
| State | Full Name |
|---|---|
| LF | Left - Full speed |
| LH | Left - Half speed |
| FF | Forward - Full speed |
| RH | Right - Half speed |
| RF | Right - Full speed |
The Control system
NOTE : “ANOS” means “AND NO OTHER STATES”
I/O
| Inputs | Purpose |
|---|---|
| A | Very Left sensor |
| B | Slightly Left sensor |
| C | Middle sensor |
| D | Slightly Right sensor |
| E | Very Right sensor |
State Saver
| State | Entry | Exit |
|---|---|---|
| LF | A ANOS | C |
| LH | B ANOS | A + C |
| FF | C ANOS | A + B + D + E |
| RH | D ANOS | C + E |
| RF | E ANOS | C |