Analog electronics, Digital electronics, Hobby, Integrated circuits, Projects, RF circuits, Wireless

Remote control vehicle

This is a project of a vehicle with tracks controlled by a pair of RF modules and intergated circuits HT-12E (encoder) and HT-12D (decoder).

The transmitter circuit

remote control transmitter

Material list

  • RF transmitter module.
remote control transmitter module
  • 3 female connectors module for the terminals of transmitter module.
  • 9 V battery.
  • Battery clip.
  • Printed circuit board (PCB).
  • Wires.
  • Voltage regulator L7805CV.
  • Capacitors: 1 300 nF polyester and 1 100 nF ceramic.
  • Resistors: 1 1MΩ (brown, black and green) and 4 10 kΩ (brown, black and orange).
  • 4 normally open buttons.
  • HT-12E.
  • Support for integrated circuit with 18 pins, to put the HT-12E.

Schematics

remote controller transmitter
The C1 value is 300 nF.

Remote control vehicle

remote control vehicle

Materials list

  • Receiver module.
The two sides of receiver module
The two sides of receiver module.
  • Protoboard.
  • Capacitors: 1 300 nF polyester, 1 100 nF ceramic and 1 220 μF electrolytic.
  • Voltage regulator L7805.
  • Resistors: 5 150 Ω (brown, green and brown) and 1 56 kΩ (green, blue and orange).
  • Decoder integrated circuit HT12D.
  • 5 LEDs of various colors.
  • Wires.
  • L293D H bridge.
  • 8.5 to 9 cm for the antenna.
  • 2 rechargeable batteries of 3.7 V and 2200 mAh or higher.
rechargeable batteries
The rechargeable batteries must be in series so that the voltage is between 7 and 9 V. Wires were scolded on the terminals.
protected batteries
It’s recommended that the batteries have some insulating protection.
remote control vehicle chassis

Schematics

remote control vehicle receiver
The C1 value is 300 nF, the battery image is illustrative. Click on the image to zoom in.

Why did I used protoboard and not PCB to build the receiver? With a phenolite board, a button were pressed and when it’s released, the motor kept turning, not receiving more commands. The cause was the brushed motor that produced electromagnetic interference when turning. Phenolite board aren’t adequate for RF circuits that involve motors. The following video shows the vehicle’s operation.

When the red LED is on, it’s ready to receive commands.
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About Pedro Ney Stroski

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