FAIO Switch has the necessary components to become a Sip-And-Puff switch when a MPX12GP GAUGE Pressure Sensor is added to the FAIO main board. FAIO Switch is developed with idea of creating a modular device so you can add or remove the Sip-And-Puff module based on your needs.
FAIO firmware is developed in way to detect if the pressure sensor is installed during the initialization process.The firmware calculates the sip and puff pressure thresholds during initialization process and use those thresholds to detect sip and puff switch activation.
I will explain the firmware in next post.
P.S : The PCB eagle file designs and instructions manual are now available in FAIO Github repository .