Chassis

The CHASSIS expansion is used to simulate some functions usually found in the Chassis domain of a car:

Steering Wheel
Parking Brake

Although not traditionally part of the Chassis domain, the lighting switch is also present in the Chassis domain.

../_images/chassis.png

../_images/chassis_tilt.png

Steering Wheel

The Steering wheel is simulated by a rotating potentiometer. A TVS diode is used for ESD protection, and a capacitor also protects the ECU input from chattering.

../_images/wheel.png — Schematic of the Steering wheel circuitry

Parking Brake

The parking brake is simulated by a pulled-up sliding switch. A TVS diode is used for ESD protection.

../_images/sidebrake.png — Schematic of the Parking Brake circuitry

Lighting Switch

The lighting switch is simulated by a rotating switch from the NR01 series of NKK switches. A TVS diode is used for ESD protection. The rotation of the switch selects a point from a voltage divider , which is measured by an ADC on the ECU.

../_images/lamp_switch.png — Schematic of the Lighting switch circuitry

Pinout

../_images/pinout1.png — Pinout of the CHASSIS expansion’s connector