Arduino Sketches

Custom Arduino Hardware

Not able to put together an Arduino of your own to run the sketches on this page? No problemo!

We now have available a limited supply of custom built hardware, based on an Arduino Pro Micro, with CANBUS shield and dedicated K-Line interface included.

These come complete with a case, which is small enough to fit just about anywhere, pre-installed sketch configured to your requirements, and a labelled wiring harness. All you need to do is wire it up to your RNS-E!

Please contact us to check availability and arrange a purchase.

Cost: £45 (GBP) + postage:

• UK - £5
• EU/NA - £10
• ROW - Contact us for postage costs

Our latest firmware for these modules now also supports:

• Ability to adjust volume and frequency from the RNSE OPS menu.
• OPS on A4 (8EC/8ED) with 8E0 919 283 B PDC module.
• Enabling of TV/AV input on RNSE via CANBUS (Separate hardware required for CVBS to RGB conversion).

Please contact us if you wish to upgrade your existing unit.

Known compatible PDC modules:

• 8Z0 919 283 A via KWP1281 diagnostics for Audi A2 (8Z) / Audi A4 (8E2/8E5) / Audi A6 (4B)
• 8E0 919 283 via KWP1281 diagnostics for Audi A4 (8E2/8E5) / Audi A6 (4B)
• 8E0 919 283 B/E via KWP2000 diagnostics for Audi A4 (8EC/8ED)

RFSL/V-Signal Injector

Use this sketch to inject RFSL and V-Signal CANBUS messages when you are using a 193 RNS-E without dedicated hardware inputs on a A6, A2, TT 8N, etc.

You will need an Arduino UNO coupled with a MCP2515 CANBUS shield and a simple Zener diode circuit to limit the input voltage from RFSL and V-Signal to 5V on the Arduino pins. RFSL input connects to pin 6 and V-Signal to pin 5.

RFSL/V-Signal Injector with Rear ONLY OPS Support (8Z0)

This sketch adds support for triggering the 193 OPS (Optical Parking System) display from an installed 8Z0-919-283 PDC (Park Distance Control) Module on an Audi A2 (8Z) / Audi A4 (8E2/8E5) / Audi A6 (4B).

You will need to add an interface to the K-Line from the Arduino TX and RX pins. You can use a STMicroelectronics E-L9637D IC for this, as it requires no additional external components. It's a SOIC8 package, but not too difficult to solder to a SOIC8 breakout board and then attach wires from there to the necessary pins on the Arduino board.

For an Audi A3 (8P) / Audi R8 (42) / Audi TT (8J) with 8P0-919-283 you will need to do diagnostics over CAN (as they do not support K-Line). However you'd probably be better fitting the 8P0-919-475 module on these vehicles, as that module supports the OPS system natively.

Note my understanding of the OPS CANBUS message format is not complete. What I know has been reverse engineered from the RNS-E firmware. If you can provide traces of the real message protocol on CANBUS IDs 0x497, 0x6DA and 0x67A it would be very helpful.

Use V1 of our sketch for Dogwood Firmware 0280 / 0710. Use V3 for all subsequent firmwares.

RFSL/V-Signal Injector with Front+Rear OPS Support (8E0)

Here is an equivalent sketch which supports the 8E0-919-283 Front+Rear PDC Module on an Audi A4 (8E2/8E5) / Audi A6 (4B).

Connect the LED output from the PDC module to the Arduino pin 4 via an appropriate voltage limiting circuit (since the LED supply is 12v). The LED output is available at either the PDC module pin 13, or at the PDC button itself. The sketch will then activate the OPS display on the RNS-E whenever it detects the LED is illuminated, which should happen in reverse and when you have manually activated the system with the PDC button.

CANBUS Sniffer

This sketch will be useful if you ever want to log the CANBUS traffic on the infotainment bus for diagnostic purposes.

K-Line KW1281 Diagnostics Logger

This sketch will be useful if you ever want to log the KW1281 diagnostics protocol, for example between a diagnostics tool and a 8Z0 or 8E0 PDC module.

Note that this sketch requires an Arduino Mega, since it requires two hardware serial ports (the Arduino UNO only has one).

Arduino CANBUS Hardware

We use an EF02037 Arduino CAN BUS Shield for our RNS-E projects. The 9 pin DB9 Serial plug should be connected:

* Note - These pins aren't actually part of the CANBUS shield. On all shields we have encountered they are left unconnected, so we repurpose them for our own ends. Where we require these signals on a project we solder wires to the appropriate pins on the rear of the CANBUS shield and connect, via appropriate input circuitry, to the Arduino below. This allows us to have a DB9 plug permanently wired in our test vehicle, and then easily connect and disconnect Arduino projects as required.

Most CANBUS shields have a 120R terminating resistor installed between CAN-H and CAN-L. The fault tolerant CANBUS used by Audi for their Infotainment bus will not work with the terminating resistor in place. Most boards will have a way to disconnect the resistor. Usually by removing a jumper, or cutting a trace between some solder pads. Check your boards documentation or circuit diagram for the correct procedure.