chrisphl / rvsmartcontrol

RV Smart Control

RV Smart Control is a LIN-bus based control system for recreational vehicles. It runs on an ESP32 (NodeMCU-ESP32/ESP32 DEVKITV1), utilizes an extra LINBUS Breakout board and a CJMCU-111 rotary input device. (I wrote an Arduino demo which shows the latter one interrupt driven.) Furhtermore an ILI9341 Display (320x240 px) is used to show the menu driven control and a combined sensor board is connected to aquire environmental information.

Part List

Please note: The links are just to showcase the components. You may buy your parts elsewhere, of course.

• NodeMCU-ESP32 - https://joy-it.net/de/products/SBC-NodeMCU-ESP32
• LIN-Bus breakout board - https://buyzero.de/products/lin-bus-breakout-board
• USB Step Down DC-DC Spannungswandler 6-24V zu 5V 3A Arduino Spannungsregler - https://www.makershop.de/module/step-downup/6-24v-usb-spannungswandler/
• 2.8 Inch ILI9341 240x320 SPI TFT LCD Display Touch Panel SPI Serial Port Module - http://www.lcdwiki.com/2.8inch_SPI_Module_ILI9341_SKU:MSP2807
• CJMCU-111 DC 5V Push Button Switch Rotary Encoder / Momentary Push Switch - https://funduinoshop.com/elektronische-module/keypads-und-buttons/rotary-encoder/rotary-encoder-cjmcu-111
• GY-91 - https://artofcircuits.com/product/10dof-gy-91-4-in-1-mpu-9250-and-bmp280-multi-sensor-module

Software

This is a PlatformIO project, developed using VSCodium editor with PlatformIO IDE extension. To install PlatformIO IDE extension you might need to activate the M$ extension maketplace for VSCode This procedure is described here: https://github.com/VSCodium/vscodium/blob/master/DOCS.md#how-to-use-the-vs-code-marketplace.

Prerequisits

Prior to compile you need to run once the following commands to install dependencies:

• pio pkg install -l "adafruit/Adafruit ILI9341"
• pio pkg install -l "adafruit/Adafruit BMP280 Library"
• pio pkg install -l "hideakitai/MPU9250"
• pio pkg install -l "adafruit/Adafruit BusIO"

The complete code is auto formatted using "atom-beutify", which is installed like this: apm install atom-beautify Selected auto formatter is "uncrustify" with default settings.

3rd Party Libraries

RvSmartControl uses the RemoteDebug library make serial debugging obsolete and uses a websocket over WiFi instead. On the remote side you can use RemoteDebugApp to receive debug messages and even control the debugging behaviour.

Hardware

This hardware description comes from https://github.com/frankschoeniger/LIN_Interface as I found it very good and the this project is slightly inspired by "LIN_interface". This description uses an Arduino Nano running the code.

Wiring Of The Components

TODO: Create Fritzing project to illustrate the wiring.

LINBUS Breakout - skpang.co.uk

PIN LIN	PIN NodeMCU-ESP32
GND	GND
CS	D12
FAULT	not connected
TxD	TX2
RxD	RX2
VCC	D14

Connector 2 on LIN Breakout

PIN LIN	PIN IBS / Car
UBat	Battery +12V
LIN	IBS PIN 2
GND	GND terminal of IBS

Hella IBS 200X Sensor

IBS	PIN IBS / LINBUS breakout
PIN1	Battery +12V
PIN2	LIN

ILI9341 TFT Display

PIN Display	PIN NodeMCU-ESP32
VCC	D27
GND	GND
CS	D32
RESET	D25
D/C	D33
SDI(MOSI)	D23
SCK	D18
LED	D26
SDO(MOSI)	D19

GY-91 Sensor

PIN GY-91	PIN NodeMCU-ESP32
VIN	not connected
3V3	D13
GND	GND
SCL	D22
SDA	D21
SDD/SAO	D4
NCS	not connected
CSB	not connected

Things to do

There are allways things that one want to see included into this project. So for a long term plan I put some use cases to remember here:

• Control Truma Combi heating devices
• Integrate DalyBMS UART Protocol over Serial2
• Water level display utilizing the GY-91 multi sensor.

If you have done some work on that allready or if you just want to contribute to the project in any way, feel free to file a pull request or open an issue.