These Infrared Phototransistors detect IR light and are used for IR remote control or IR obstacle avoidance and intrusion sensors.
- Qty 5 – Infrared Phototransistor
KEY FEATURES OF INFRARED PHOTOTRANSISTOR:
- 940nm nominal wavelength detection
- Dark lens to reduce visible light interference
- 5V compatible
Infrared (IR) is the light spectrum that is commonly used for IR remotes and is outside the visible spectrum for the human eye.
These phototransistors are used to detect the presence of IR which may be from an IR remote control, an IR emitter LED or even an open flame which also emits IR.
The phototransistor is a transistor with leads coming out for the emitter and collector connections but with no base connection. The base is enabled when IR light is detected which then allows current to flow between the emitter and collector pins.
When used as an IR remote control for something like a robot, the IR is typically pulsed at a modulated rate of 38kHz to created coded messages. Different manufacturers have different transmission protocols for these coded messages. There is a library that can be used with Arduino called IRRemote.h if you are looking to create a standard remote control or other communication link that can make use of standard codes.
OUR EVALUATION RESULTS:
These devices are very useful for adding IR detection capability to a project including everything from creating a custom serial IR communication link for a robot project or to make an intrusion detector if the IR signal is blocked. The device can also be used to detect an open flame. If you need a transmitter for use with this receiver, you may also want to pick up our IR Emitter LED below.
The circuit below is an easy way to setup a simple IR emitter / IR phototransistor pair to experiment with basic operation. When the IR phototransistor detects IR coming from the IR LED, it will turn on and light the IR Detected LED. The brightness of the LED will depend on the strength of the IR that is detected. Note: If the IR Detected LED only glows slightly, make sure that the IR Phototransistor leads are not reversed.
|Dimensions||5 x 5 x 8.5mm|
|Appearance||Black (blocks visible light)|
|Viewing Angle||20 Degrees (typical)|
|IF||Maximum Forward Current||16mA (tested to)|
|VF||Collector Emitter Breakdown||5V (tested to)|
|Peak Wavelength||940nm (Typical)|
|Package Type||Plastic body, 2-lead, through hole|