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How do I integrate a CNG/LPG differential pressure sensor into my circuit?If you’re developing a microcontroller-based differential pressure measurement system there are a wide range of board-mounting sensors available to choose from. As we’ve already seen, some provide a conditioned and amplified analogue output that can be applied to an ADC input.Others digitise the signal inside the sensor, allowing them to be connected to a digital serial interface such as I2C or ZACwire.I2C is a relatively well-known interfacing technology and is even available on some of the smallest 8-bit microcontrollers. Requiring just two wires, one is used for a clock while the second is a bi-directional data line.Since I2C supports multiple nodes, it’s also important to consider the overall bandwidth of the bus. As more devices are added to the bus, the risk that the pressure sensor cannot be accessed as often as desired increases. Another important consideration is the dimensioning of the pull-up resistors on the bus. The official specification for I2C provides a proper explanation of how to calculate the necessary values.