A smart parking system with IoT using both Arduino and Node MCU. Enabled cloud update of availability of parking slots.
1 Arduino MEGA 2560 board, 1 Node MCU, 1 HC-SRO4 ultrasonic sensor, 1 LCD display, 2 FC-51 IR modules, 2 SG-90 servo motors, 1 Potentiometer, 1 Breadboard, Several jumper-wires
Working Voltage: DC 5V, Working Current: 15mA, Working Frequency: 40Hz, Min Range: 2cm, Max Range: 4m, Measuring Angle: 15°.
Pin-out
VCC: Power, GND: Ground, TRIG: trigger output, ECHO: echo input
Operating voltage: 5±0.3V DC, Operating current: 1mA (without backlight), Controller: Hitachi HD44780 LCD controller, Screen resolution: 2 lines x 16 characters, Character resolution: 5 x 8 pixels
Pin-out
| Pin no. | Label | Connection | Function |
|---|---|---|---|
| 1 | VSS | GND | Signal ground |
| 2 | VDD | 5V | Logic power for LCD |
| 3 | V0 | 10 kΩ potentiometer | Contrast adjustment |
| 4 | RS | Pin 41 | Register select signal |
| 5 | R/W | GND | Read/write select signal (grounded to write) |
| 6 | E | Pin 39 | Operation enable signal |
| 7–14 | D0 – D7 | Data bus lines used for 8-bit mode | |
| 11-14 | D4 – D7 | Pin 37, 35, 33, 31 | Data bus lines used for 4-bit mode |
| 15 | A (LED+) | 5V | Anode for LCD backlight |
| 16 | K (LED-) | GND | Cathode for LCD backlight |
Detection angle: 35 °, Operating Voltage: 3.0V – 6.0V, Current Consumption: at 3.3V : ~23 mA, at 5.0V: ~43 mA, Detection range: 2cm – 30cm (Adjustable)
Pin-out
VCC: 3.3V-5V, GND: Ground, OUT: Digital Output Pin
Operating Voltage: DC 4.8-6V, Operating Speed (4.8V): 0.15 Seconds/60°, Operating Speed (6V): 0.12 Seconds/60°, Stall Torque (4.8V): 1.3kg/cm, Stall Torque (6V) : 1.5kg/cm, Rotation: 0°-180°, Gear Type: Plastic.
Pin-out
Red Colour- Supply, Orange Colour- PWM (Signal), Brown Colour- GND.
