Car Intercooler Sprayer

Projects General Guidance
1

I am trying to figure out how to control an electric pump in my car that will spray "water" onto my intercooler to keep the intake air temps down.

I am considering two routes. I will also have a raspberry pi monitoring all of the sensors through a Bluetooth OBD2 connection. The Pi data will be displayed on a touchscreen. I have a Rasberry Pi 3 Model B, official RPi touchscreen, Arduino Uno, a 12V Active Low 2 Channel Relay, and a Mean Mug Auto 81514-232316A Front Windshield Washer Pump. Following are my two thoughts on options for the Sprayer:

1- visually monitor the intake temp and push a button (physical or perhaps digital on screen) to send a pulsing signal to the pump for a limited time (around 5-10 seconds with only 1/2 second sprays)

2- integrate the arduino to read the air temps that the Pi is monitoring, and automate the process completely.

This would need to be able to be able to turn off completely as it will not always be needed. Only when running high boost. I have a little experience with Arduino but not much. Any help is greatly appreciated. Thank you in advance.

2

If the Pi is already monitoring temperature and boost, why can't it turn the sprayer on or off as needed?

3

Yeah, makes no sense to use an Arduino. The Pi has I/O pins to signal the relay.

4

The reason I was thinking to use the arduino is so I can turn it on and off as needed without having to worry about a shutdown sequence or anything. But I could just use the Pi I guess