A bin level monitoring system bin level monitoring system comprising an optical sensor for sensing a feed level inside a feed bin, a circuit board communicatively connected to the sensor for receiving a level signal from the sensor and for processing the level signal to generate bin level data, a battery for powering the circuit board and sensor, an enclosure for enclosing the circuit board and a radio transmitter for transmitting the bin level data. The sensor may be a LIDAR sensor or a time-of-flight (ToF) sensor.