OBD_Gauge

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An Arduino-powered automotive gauge using OBDII.

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# OBD_Gauge
A simple Arduino-powered automotive gauge to display readings from various car sensors.
The readings that are currently implemented are:
- Air/Fuel Ratio (AFR)
- Air Intake Temperature (°F)
- Oil Temperature (°F)
- Battery Voltage (V)
- Coolant Temperature (°F)
- Fuel Pressure (kPa)
- Engine RPM (rpm)
- Vehicle Speed (mph)
- Engine Load (%)
- Throttle Position (%)
- MPG and Average MPG (mpg)

This project was developed for and tested on a 2013 Scion FR-S, other vehicles may have different sensor setups and ECU calculations for readings.

# DEPENDENCIES
- [ArduinoOBD](https://github.com/stanleyhuangyc/ArduinoOBD)
- [TaskScheduler](https://github.com/arkhipenko/TaskScheduler)
- [Adafruit SSD1306](https://github.com/adafruit/Adafruit_SSD1306)
- [Adafruit GFX](https://github.com/adafruit/Adafruit-GFX-Library)

# HARDWARE
This project uses an ESP8266 NodeMCU, a [2.42" 128*64 SPI OLED](https://www.amazon.com/Diymore-Digital-Display-SSD1309-Electronic/dp/B07XRFFPCT?pd_rd_w=EUQfU&pf_rd_p=8baf753a-4815-4dcb-a8bf-42c9153b6c3c&pf_rd_r=ZQP4KVRZCYEDSM22EVC8&pd_rd_r=eb716e96-0f38-4710-bd69-d92a9f0fe958&pd_rd_wg=s9fjA&pd_rd_i=B07XRFFPCT&psc=1&ref_=pd_bap_d_rp_5_i), and a [Freematics OBD-II UART Adapter](https://freematics.com/products).

> Pin RST -> Button 1 -> GND \
> Pin D1 (330Ohm pulldown resistor) -> Button 2 -> 3.3V \
> Pin D4 -> DC on OLED  \
> Pin D5 -> SCL (SCK) on OLED  \
> Pin D6 -> RES (MISO) on OLED \
> Pin D7 -> SDA (MOSI) on OLED\
> Pin D8 -> CS on OLED\
> 3.3V & GND to VCC & GND on OLED \
> Pin TX -> RX on OBD-II UART Adapter \
> Pin RX -> TX on OBD-II UART Adapter \
> 5V and GND is provided from OBD-II UART Adapter for Arduino and OLED

# LIBRARY MODIFICATIONS
I found that the OBD2UART library with the ESP8266 board select Serial1 for UART communication - which, normally, would be fine BUT the SPI display uses the Serial1 pins and effectively makes the display go crazy. Therefore, Serial should be used for for UART communication - so I changed line 17 in `OBD2UART.h` to: 
```cpp
#define OBDUART Serial
```
I also didn't like the Adafruit splash screen on each reboot - so I removed it by deleting these lines (# 470 - 476) in `Adafruit_SSD1306.cpp`:
```cpp
if (HEIGHT > 32) {
   drawBitmap((WIDTH - splash1_width) / 2, (HEIGHT - splash1_height) / 2,
            splash1_data, splash1_width, splash1_height, 1);
} else {
   drawBitmap((WIDTH - splash2_width) / 2, (HEIGHT - splash2_height) / 2,
            splash2_data, splash2_width, splash2_height, 1);
}
```
# REFERENCES
- A user named robot on the FT86CLUB forums inspired this project with his [post](https://www.ft86club.com/forums/showthread.php?t=75181&highlight=arduino) and his [code](https://github.com/stirobot/arduinoModularTFTgauges/blob/master/oledOBDgaugesSmallIrvinedLib/oledOBDgaugesSmallIrvinedLib.ino).

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