8 DIGITAL, 4 ANALOG and one I2C - can be used for all fischertechnik sensors: phototransistor, photo resistor, magnetic sensor, switch, NTC, colour sensor and IR track sensor. Sensors from fischertechnik which are operated via I2C communication with 3.3 V, such as environmental sensor, combination sensor and TXT ultrasonic sensor, are not supported. However, sensors from other manufacturers can be used (power supply via the 3.3 V or 5 V output connections). Sensors that use 9V for power supply are connected to one of the outputs and sensors with a maximum output signal of up to 9V are connected to the inputs of the Pi-F5-HAT. In addition to conventional connections, the HAT also includes a serial UART (TX / RX) connector.