Obstacle sensor

Obstacle Avoidance Sensor

Available: 30 Items
MMK: 2,000 Ks

Product Description

Infrared Obstacle Avoidance Proximity Sensors Module has builtin IR transmitter and IR receiver that sends out IR energy and looks for reflected IR energy to detect presence of any obstacle in front of the sensor module. The module has on board potentiometer that lets user adjust detection range. The sensor has very good and stable response even in ambient light or in complete darkness.

The sensor module can be interfaced with Arduino, Raspberry Pi or any microcontroller having IO voltage level of 3.3V to 5V.


  • Obstacle avoidance in robots
  • Production counting on assembly lines
  • Presence detection
  • Security systems


  • LM393 Comparator based detetction circuit is very stable and accurate
  • On board potentiometer sets obstacle detection range
  • On board Power LED indicator
  • On board Obsatcle Detection LED indicator
  • 3.0MM mounting hole for easy mounting the sensor.
  • Male header for easy connection
  • Good Accuracy: By use of Infra-red LED transmitter the module performs well in Ambient light

Technical Specifications

  • Model Number: FC-51
  • Detection angle: 35 °
  • Operating Voltage: 3.0V – 6.0V
  • Detection range: 2cm – 30cm (Adjustable using potentiometer)
  • pcb size : 3.1 cm (L) x 1.4 cm (W)
  • Overall Dimension: 4.5cm (L) x 1.4 cm (W), 0.7cm (H)
  • Ative output level: Outputs Low logic level when obstacle is detected
  • In-active output level: Outputs High logic level when obstacle is not detected
  • Current Consumption:
    • at 3.3V : ~23 mA
    • at 5.0V: ~43 mA


  1. VCC: 3.3V-5V power input pin
  2. GND: 0V power pin
  3. OUT: Digital Output Pin

Documents and Download

  • Infrared Obstacle Avoidance Proximity Sensors Module FC-51 product review video 
  • LM393 Comparator IC Datasheet
  • A useful link on construction and working principle of obstacle avoidance sensor

Package Includes

  • 1x Infrared Obstacle Avoidance Proximity Sensors Module