10/30/2020

Simple and Cheap, 4 Channel Remote Control Construction for RC Vehicles. DIY RC

RF 4 Channel Remote Control construction with PT2262 Encoder and PT2272 M4 Decoder integration.

I used 433Mhz RF modules in this circuit. With the RX470-4 transmitter and WL102-341 receiver module, it is possible to reach a range of 100 meters in ideal conditions. This range is more than enough for small RC model vehicles. Longer range can be achieved by using different RF modules in the same circuit. In theory up to 4km is possible.

The remote control system consists of a transmitter with 4 buttons and a receiver with L293B integrated, which can drive 2 motors independently. L293D can also be used as a motor driver. L293D has a maximum current support of 0.6 Amps for each motor. L293B, on the other hand, can provide 1 Ampere support continuously. If the current drawn by the motors you will use is not greater than 0.6A, you can use the relatively cheaper L293D.

The commands are not proportional in this type of circuit. It provides commands such as Open-Close / Forward-Back / Right-Left. It can be used in many non-sophisticated RC vehicle applications and with devices that want to be controlled wirelessly.

RF Transmitter Circuit Diagram:
Required Materials and their duties in the Circuit:

L7805 5V Regulator (Reduces the input voltage to a constant 5v for the regulator section)
https://www.banggood.com/custlink/33vYVvaTR0

0.33uF Capacitor (filters possible electrical interference at input voltage for 5v regulated section)
0.1uF Capacitor (5v regulated section filters out possible small electrical interference)
https://www.banggood.com/custlink/v3DGOAqc2e

10uF 25V Capacitor (filters possible relatively large electrical interference in output voltage for 5v regulated section)
https://www.banggood.com/custlink/KDmvNvuooD

PT2262 Encoder IC (encodes the signal sent to the RF transmitter module)
https://bit.ly/3lnro9a

18 Pin IC socket Optional. It is used when the integrated leg is not desired to be soldered.
https://www.banggood.com/custlink/3D3dFGlfCf

RF Transmitter module
(Used to wirelessly transmit the data generated by the Integration) 4 x 10K Resistors (Resistors for pulldown purposes; It prevents instability caused by interference that may occur due to the momentary idle circuit ends while pressing or releasing the buttons)
TX & RX Modul: https://www.banggood.com/custlink/v3GdtDLTJU

4 x 1N4148 Diodes (When the button is not pressed, it prevents electricity from going to the integrated, ensuring stable operation of the transmitter)
https://bit.ly/2GybpGF

1.2M Resistor
(Connected between the Integrated OSC outputs and determines the frequency. There should not be a random resistor. Which values ​​can be used resistors are specified in the PT2262 Datasheet)
Resistors:  https://bit.ly/2GJJROe

4 x 12mm Tach Button (Buttons can be of different size or type. Momentary push type is sufficient)
https://bit.ly/3lnxxCl

9V Battery (The regulation circuit supports up to 18V, but it is recommended to use a supply between 7-9 volts for efficiency. Ideally it can be a 9V battery or 7.4V LiPo. The supply
voltage should not be less than 7 volts. Because about 2V of the energy passing through the 7805 is the drop voltage. (In a sense, it can be called lost voltage.) That is, if we feed it with 6V, the output will be 4V. The ideal operating voltage of the transmitter is 5V. Low voltage range also negatively affects. Therefore, we can say that between 7V and 9V is the ideal supply voltage.

The buttons can be shaped according to the vehicle we want to control. The positions in the diagram are ideal for classic Rc car and boat. But for Rc tanks or similarly moving vehicles, if the buttons on the right are placed like the ones on the left, a more practical use is obtained.

RF Receiver Circuit Diagram:
Required Materials and their duties in the Circuit:

L7805 5V Regulator (Reduces the input voltage to a constant 5v for the regulator section)
https://www.banggood.com/custlink/33vYVvaTR0

0.33uF Capacitor (filters possible electrical interference at input voltage for 5v regulated section)
0.1uF Capacitor (5v regulated section filters out possible small electrical interference)
https://www.banggood.com/custlink/v3DGOAqc2e

10uF 25V Capacitor (filters possible relatively large electrical interference in output voltage for 5v regulated section)
https://www.banggood.com/custlink/KDmvNvuooD

PT2272 M4 Decoder IC (decodes the signal coming to the RF receiver module and activates the corresponding channel output)
https://bit.ly/33DK1jq

18 Pin IC socket Optional. It is used when the integrated leg is not desired to be soldered.

5 x 680R Resistor (It is used to reduce the current to the LEDs indicating the signal coming and which channel the command is coming in. Because the voltage output from PT2272 is high for LEDs)

5 x 3mm Leds (Indicates which channel is active.
https://www.banggood.com/custlink/Gm3EtGoTNJ

200K Resistor (Connected between the Integrated OSC outputs and determines the frequency. There should not be a random resistor. Which values ​​can be used resistors are specified in the PT2272 Datasheet)

RF Receiver Module (Receives the data received with the signal and sends it to the decoder integrated)

L293B Motor Driver IC (Directs DC motors according to commands from decoder)
https://www.banggood.com/custlink/vKKRVDaTll

16 Pin IC socket Optional. It is used when the integrated leg is not desired to be soldered.

Gear motor: https://www.banggood.com/custlink/vGDhHKlfeY

The circuit has two motor connections. In the sample vehicle in the video, 4 engines are used. The cables of the 2 motors on the right are connected in parallel to each other and act like a single motor. Likewise for the two engines on the left.

This circuit can be used with different applications other than RC vehicles. It is also suitable for functions such as turning on light, remotely turning on / off any electrical device by using the appropriate relay instead of the motor driver.