MitchElectronics
Light Alarm
£6.99
20 items in stock
The Light Alarm kit is a DIY electronics kit that lets you build an alarm that triggers upon detecting light. RoHS compliant, REACH compliant, and perfect for beginners!
- Product Code
- LIGHT-ALARM
- Manufacturer
- MitchElectronics
- Manufacturer Part Number
- LIGHT-ALARM
- Category
- Blue Kits
- Country of Origin
- United Kingdom
RoHS: YesREACH: YesCE: YesUKCA: Yes
Overview
Product Description
The Light Alarm kit allows you to build an alarm circuit that beeps a small (but very loud) buzzer upon detecting too much light. The sensitivity of the light sensor can be changed with the onboard potentiometer, and component values on the PCB can be changed if needed to increase or decrease the rate of the buzzer.
Because the buzzer is a 5V device, this circuit needs a 5V supply which can be obtained using a 7805 regulator or using another MitchElectronics kit such as the Simple Power Supply and the Simple Power Module SMD Trainer kit. If the buzzer is removed, the board can be powered from a 9V PP3 battery and an external buzzer circuit can then be used that is compatible with 9V supplies.
Because the buzzer is a 5V device, this circuit needs a 5V supply which can be obtained using a 7805 regulator or using another MitchElectronics kit such as the Simple Power Supply and the Simple Power Module SMD Trainer kit. If the buzzer is removed, the board can be powered from a 9V PP3 battery and an external buzzer circuit can then be used that is compatible with 9V supplies.
Resources
Instructions & Documentation
Technical
Product Specifications
- Assembly
- Kit form
- Prebuilt
No
- PCB Dimensions
- 68mm x 34mm
- Mounting Holes
Yes
- Battery Powered
No
- Component Count
- 20
- Battery Included
No
- Operating Voltage
- 5V
- Operating Frequency
- N/A
- Mounting Hole Details
- 4 x M4 (60mm x 26mm)
In the box
Included With This Product
| Name | Quantity | Reference |
|---|---|---|
| 8 DIP Socket | 2 | U1, U3 |
| 14 DIP Socket | 1 | U2 |
| LM358 | 1 | U1 |
| NE555 | 1 | U3 |
| 4013 | 1 | U2 |
| 100nF Capacitor | 1 | C2 |
| 10uF Capacitor | 1 | C1 |
| 1KΩ Resistor | 2 | R2, R4 |
| 10KΩ Resistor | 2 | R1, R5 |
| 56KΩ Resistor | 1 | R3 |
| 10KΩ Potentiometer | 1 | RV1 |
| 1N5817 Diode | 2 | D2, D3 |
| 2N3904 | 1 | Q1 |
| Photodetector | 1 | D1 |
| Buzzer | 1 | BZ1 |
| Tactile Switch | 1 | SW1 |
| Black Wire | 1 | J1 |
| Red Wire | 1 | J1 |
| Light Alarm PCB | 1 | — |
More information
Applications
- The Light Alarm kit is an excellent project for those wanting to learn about photodetectors, how they work, and how they can be used in trigger circuits. This kit also teaches how logic circuits work, the function of flip flops, and how comparators can be used to convert an analogue signal into a digital signal. Additionally, this is also excellent for those looking to create basic security systems as well as those who want to train their soldering capabilities.
- Education and training – Useful for teaching light-dependent sensing, comparators and threshold detection, while providing practical experience with through-hole soldering, component identification and PCB assembly.
- Project integration – Suitable for projects such as Burglar Alarm, Headlight Warning System, Darkroom Integrity Monitor, and other designs where the following function is useful: Light-triggered alarm with adjustable sensitivity and an audible output
More information
Notes
- Electrical specifications are nominal and may vary with component tolerances, supply voltage, load and operating conditions.
- The product is supplied in kit form and requires soldering and assembly before use.
- Check component values and observe the polarity or orientation of ICs, diodes, LEDs, transistors and electrolytic capacitors before applying power.