Remote Light Switch by Wireless from Nano

Hi

I am attempting to set up 2 x Arduino Nano’s for remote controlled 12vdc spotlight use.

Components:

2 x Arduino nano

2 x nRF24L01 wireless modules

1 x L298N Dual H Bridge module

1 x Joy Stick (same as project type)

1 x 12vdc 40RPM reversible motor (rotator)

1 x 12vdc 2rpm reversible motor (up/down)

2 x sets 2:1 ratio gear (20:40)

1 x 40amp 12v 5pole relay

Power : 12 volt dc – standard motor vehicle current.

Relevant Buck up/down to suit module power requirements and to smooth out flow.

The idea for this came from the DroneBot Workshop YouTube video “Wireless Joystick for Arduino Robot car with nRF24L01”.

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I would like to use the SW (Switch) on the joy stick to remote activate the spotlight. This requires 2 x digital pins:

( As per Paul McWhorters Tutorials 27 & 28)- I adapted his tutes and have the Joy Stick switch operating.

int LEDState=0;

int LEDPin =8;

int buttonPin=12;

int buttonNew;

int buttonOld=1;

int dt=100;

void setup() {

// put your setup code here, to run once:

Serial.begin(9600);

pinMode (LEDPin, OUTPUT);

pinMode (buttonPin, INPUT);

}

void loop() {

// put your main code here, to run repeatedly:

buttonNew=digitalRead(buttonPin);

if(buttonOld==0 && buttonNew==1){

if(LEDState==0){

digitalWrite(LEDPin,HIGH);

LEDState=1;

}

else{

digitalWrite(LEDPin, LOW);

LEDState=0;

}

}

buttonOld=buttonNew;

delay(dt);

}

However:

The DroneBot video etc is based on the Uno not the Nano.

On the client end of the wireless transmission I have

1 x Nano – with effectively 12 digital pins.

1 x nRF24L01 takes up 5 pins

1 x L298N takes up 6 pins.

I have 1 x Digital pin left{

Question 1.

On the client side will the nano require 2 pins as this will be an output to the relay.

If 2 pins required then:-

Question 2.

Can I use Pins 1 or 2? - I have attempted to use them with no effect

Can I use a Analog pin? I have attempted to use them with no effect.

Any help on these questions would be appreciated.