This repository contains C/C++ code to read and display (via Bluetooth) car sensor values. The code was create to get information from:

• Pressure Sender
• Temperature Sender
• MPX4250AP (Pressure sensor)

Sender Diagram

This is just a simple voltage divider circuit with a 0.1 uF capacitor and a 10K ohms resistor to help stabilize the signal.

• On the water temperature sender, I used 4.7 k ohms.
• On the oil temperature sender, I used 330 ohms.
• On the oil pressure sender, I used 100 ohms.

This values can change to match the sender resistor range for the values you want more precision.

I have bought 3 eBay senders, two temperature sender and one pressure sender.

• 1/8 NPT Oil/Water TEMPERATURE TEMP Sender Sensor fits Autometer VDO Smiths Gauge (hosefittingsuk)
• Oil Pressure Electronic Sensor/Sender Replacement Universal Fit Gauge 1/8" NPT (mcgillmotorsports)
• Aftermarket Gauge Universal 1/8 NPT Oil / Water Temp Temperature Sensor Sender (aggressive_gauges_ltd)

All the calculations with voltage divider and sensor mapping is done in this google drive sheet: https://docs.google.com/spreadsheets/d/1dIEgK2CFQV0UKZFhlpiRPlZvceNms4iL4nMmq7J9Fz0

• Copy the folders inside folder lib to your arduino libraries.
• Open car_sensor_dashboard.ino inside car_sensor_dashboard folder.