Sensors module

Sensors module includes the combined board of sensors, low-pass filter and external senors.

Sensors module features

• Ultrasonic distance measure sensor Devantech SRF05 with cable (measuring distance 1-400 cm) datasheet
• Infrared distance sensor Sharp GP2Y0A21YK0F (measuring distance 10-80 cm) datasheet
• Light intensity sensor (photoresistor) VT935G (resistance 18,5 kΩ on 10 lux) datasheet
• temperature sensor (thermistor NTC) (resistance 10 kΩ on 25 °C) datasheet
• Potentiometer 10 kΩ

Every sensor on the board is connected through the multiplexer, enabling to select between on-board sensor or external sensor which can be connected to the same port through the connectors. By default all on-board sensors are connected to the analogous inputs of the microcontroller (ADC0-ADC3).

Schematics of sensors connections

Low-pass filter can be composed between external analogous inputs 0-3 (PF0-PF3). Resistor and capacitor will be connected to the socket for building up the low-pass filter. By default a low-pass filter is composed for the channel 0 (PF0). Resistor value is 10 kΩ and capacitor value is 100 nF.

Schematics of low-pass filter

While connecting the module it is suggested to follow the order as described below. Before connecting any cable make sure that the power is removed from Controller board.

1. Connect the Sensors module with Controller module
2. If needed connect the external sensor(s) (check the polarity)
3. If needed connect the User Interface module on the top of layers.
4. If needed connect the JTAG programmer with Controller module.
5. Connect the power supply with Controller module.

Connecting the Sensors module