This project uses
- 1 Wire Interface (Digital Pin 7) => Four 1 Wire temp sensors (CoolantTemp, GearBox Temp, Transfer Case Temp and Intake Mainifold/ Air temp)
- SPI Interface (Digital Pin 4,5,6) => One Thermocouple Amplifier with K-Type Thermocouple (EGT Temperature)
- Analog Interface (Analog Pin 3 and 4) Two 5V 0-100psi Pressure Transducers (Boost Pressure 0-30psi and Oil Pressure 0-100Psi 0.5 to 4.5V reading)
- I2C Interface (Digital PIN 20 and 21) One OLED 128x128 Display (Metrics Display) + One BMP180 Barometric Pressure/Temperature/Altitude Sensor (Cabin Temp and Altitude Sensor) To Add
- Two B25 Voltage Sensor Detection Module (Starter Battery and Auxilliary Battery Sensors)
Other components
- 1 4.7 KOHM Resistor as a pull up between data/ signal Pin 7 and VCC.
- 1 5V Power supply in the engine bay with a jumper cable to arduino's ground (Arduino is in the Cab)
All 1 Wire sensors, Pressure Transducers and Themocouple Amplifier get power from the secondary 5V power supply above in the engine bay. All data/ signal pins terminate to a CAT6 wall outlet jack in the engine bay. The arduino powers the OLED and the BMP180 Barometric Pressure/Temperature/Altitude Sensor All other signal Pins terminate on a second CAT6 Wall outlet jack attached to the box with Arduino. There is a cat6 cable connecting the two cat6 jacks in the cabin and the engine bay running through the firewall. Arduino is powered indipendently using a 13.8 -9V buck converter. But it can also be powered using a normal 5v source. The Arduino, Display and the Temp/Pressure sensors are in a small box that fits between the driver A Pilar and the Intrument Cluster.
Notes 2024 Jan Added integration to ESP32 via UART (Serial 2) - ESP32 listents to serial 2 data coming from Serial2.print on Arduino and reads the last complete block of sensor and time data. ESP32 converts that data to JSOn and exposes it on a /readings enpoint This is then visualized on the root path / as gauges using Javascript, CSS and HTML A second /charts page shows the trends of various metrics over time as long as the browser remains open (not stored anywhere in ESP32) ESP32 Exposes a wifi network that allows you to connect and access the page at http://192.168.4.1/. It can also connect to your exixting wifi network by commenting out ( //Set ESP32 as Wifi Client). You can use as both AP and client but I have noted that ESP32 is running out of resources if you do that.
Future Plans Add a buttons page to enable buttons/ sliders and sen values to Arduino from ESP32 that are then used to trigger actions via a relay block and/or optocouplers. Add a page on ESP32 to manage basic sensor configurations like allocate newly discovered one wire sensors or add an additional sensor to I2C, Analog Port etc.