Kemo Light Barrier - B045 - 12v
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Rapid Online - Rapid Electronics Ltd.Kemo B045 Light Barrier 12v
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Product Information
Full details
The Kemo B045 is a versatile light-sensitive relay kit designed for electronics hobbyists and DIY enthusiasts who need a reliable way to automate switching tasks. Its primary strength lies in its dual-function capability, serving effectively as either a light-activated alarm sensor or a twilight switch for automated lighting. While it offers high precision through its operational amplifier comparator design, users should be aware that this is an assembly kit requiring soldering skills and basic electronics knowledge for successful implementation.
All features
| Model Part Number | B045 |
|---|---|
| Brand | Kemo |
Extended Product Information
FAQs
Does this kit come with a power supply?
No, the Kemo B045 is an assembly kit and requires a separate 12V DC power source.
Can I use this outdoors?
The circuit board is not weatherproof; you must place it in a suitable, protected outdoor housing.
What is the maximum load the relay can handle?
Please refer to the technical datasheet included with your specific kit batch for the relay's maximum voltage and amperage ratings.
Is this difficult to solder?
It is suitable for hobbyists with basic soldering experience, but it is not recommended for absolute beginners without supervision.
Can I adjust how dark it needs to be before it turns on?
Yes, the onboard potentiometer allows you to fine-tune the sensitivity threshold.
Troubleshooting
Relay does not trigger when light is blocked
Check the sensitivity adjustment potentiometer and ensure the sensor is receiving consistent light to begin with.
Relay chatters or toggles rapidly
Verify the light source is steady and not flickering; ensure ambient light is not oscillating near the threshold level.
Unit fails to power on
Check the 12V DC power supply output and verify that all solder joints on the board are solid without cold joints.
Pros and Cons
Pros
- High precision light sensing via operational amplifier
- Dual functionality as both alarm sensor and twilight switch
- Reliable mechanical relay for controlling secondary devices
- Adjustable sensitivity for specific environment calibration
Cons
- Requires soldering and assembly before use
- No enclosure included for permanent mounting
- Requires stable 12V DC power source
- Not suitable for outdoor use without a weatherproof housing
Setup, Compatibility & Care
To set up the Kemo B045, ensure you have a regulated 12V DC power supply connected to the appropriate terminal blocks. Before assembly, verify all components against the provided kit list and use a fine-tip soldering iron to mount parts onto the PCB, ensuring proper polarity for capacitors and transistors.
Compatibility:
- Works with any 12V DC power source capable of delivering required amperage for the relay.
- Compatible with various load types (lights, horns, solenoids) provided they do not exceed the relay's rated current capacity.
Care:
- Keep the light sensor clean and free of dust or debris to maintain sensitivity.
- Use a plastic project box if deploying in dusty environments to protect the circuit board.
- Avoid exposing the PCB to moisture or extreme humidity to prevent corrosion.