Abstract: An electronic device such as a wristwatch may be provided with conductive structures. The conductive structures may include a sensor electrode for an electrocardiogram (ECG) sensor. A coating may be disposed on the sensor electrode to reflect particular wavelengths of visible light so that the sensor electrode exhibits a desired color. The coating may include adhesion and transition layers on the sensor electrode, an opaque coloring layer on the adhesion and transition layers, and a thin-film interference filter on the opaque coloring layer. The thin-film interference filter may have an uppermost diamond-like carbon (DLC) layer. The DLC layer may contribute to the color response of the coating while concurrently minimizing noise in ECG waveforms gathered by the ECG sensor using the sensor electrode.

Abstract: Engines fuelled with gaseous fuel stored in liquefied form comprise different strategies and controls for managing gaseous fuel compared to other systems, previously resulting in an ad hoc arrangements of controllers. An engine control apparatus comprises an internal combustion engine fuelled with a gaseous fuel stored in liquefied form and a control unit programmed with a fuel system module, for monitoring gaseous fuel pressure and actuating a fuel injection apparatus for introducing gaseous fuel into a combustion chamber, and a liquefied gaseous fuel module, for monitoring the quantity of liquefied gaseous fuel remaining in a storage vessel and controlling a pumping apparatus that pumps liquefied gaseous fuel from the storage vessel to a vaporizer. The fuel system control module and the liquefied gaseous fuel control module cooperate to introduce gaseous fuel in the combustion chamber at a predetermined pressure as a function of engine operating conditions.

Abstract: An apparatus and method improve the accuracy of measurements taken with a capacitance-type sensor. In addition to the sensor the apparatus comprises a measurement circuit and a microprocessor. One of the sensor or a calibration capacitor with a known and fixed capacitance is connectable to the measurement circuit by a switch that has its position controlled by the microprocessor. The microprocessor sends measurement signals to the measurement circuit and receives data therefrom. According to the disclosed method, the measurement circuit is programmed to determine an error between measured calibration data and the known capacitance and to use this error to calculate a correction value, which it applies to the measured sensor data to calculate corrected sensor measurements.

Abstract: An apparatus and method improve the accuracy of measurements taken with a capacitance-type sensor. In addition to the sensor the apparatus comprises a measurement circuit and a microprocessor. One of the sensor or a calibration capacitor with a known and fixed capacitance is connectable to the measurement circuit by a switch that has its position controlled by the microprocessor. The microprocessor sends measurement signals to the measurement circuit and receives data therefrom. According to the disclosed method, the measurement circuit is programmed to determine an error between measured calibration data and the known capacitance and to use this error to calculate a correction value, which it applies to the measured sensor data to calculate corrected sensor measurements.