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Proximity sensor built around a voltage comparator chip, an infrared transmitter and an infrared receiver, with a trimmer for sensitivity adjustment, analogue and digital outputs and two status LEDs for power and output signal

This compact module uses a LASER as the transmitter and a phototransistor as the receiver. The beam emitted by the transmitter is reflected by the surface in front of it and hits the lens of the receiver (the lens focuses the reflected light onto the phototransistor), turning the phototransistor on

3-pin LDR light sensor module with digital output, compact and adjustable, ideal for Arduino and automatic dusk switches.

Analogue sensor with a light-dependent resistor and a 3-pin output connector, 2.54 mm pitch.

Breakout board built around the AMS AS3935 chip, able to pick up the radio-frequency disturbance caused by an electrical arc and, through suitable processing, deliver a signal corresponding to the detection of a lightning strike and its intensity. All the signals needed to drive the chip are brought out to a row of 2.54 mm pitch pads along one edge

Made of stainless steel and fitted with a float, it is used to detect the level of a liquid inside a tank and can switch on a pump, a warning lamp, an alarm or another device

Made of stainless steel and fitted with a float, it is used to detect the level of a liquid inside a tank and can activate a pump, an indicator light, an alarm or another device