The controller acts as a bridge between the sensor module and the host system. A set of resistor dividers measure the five force sensitive resistors while a transistor drives the haptic actuator.
I am using a SAMD21 based micro-controller module (the SeeedStudio XIAO). It incorporates an oscillator, voltage regulator, USB connector, EMI shield and more for less than $5. In production these components will be directly incorporated into the control board design, but while prototyping it would be difficult to beat the cost.