LED chaser using NE555, CD4017, Infrared receiver and photoresistor

This product is shipped from Sydney, Australia. Worldwide shipping available- we ship to USA, Canada, New Zealand, UK, EU and Non-EU countries.

This is the modified version of a conventional LED chaser. We have modified this kit to respond to infrared and light. 

The kit does work normally like a normal LED chaser kit. In addition to its obvious features, it has a photoresistor that allows you to change the speed of the chasing LEDs. In the old LED chaser, the speed is controlled with a variable resistor. In this kit, we have used a photoresistor to work as a variable resistor. As the light falling on the photoresistor changes, the speed of the LEDs also changes.

You can set the kit to receive infrared signals. If you turn on this feature, the LED chaser works only when you press a remote control close to the infrared receiver.  

You can use both infrared and photoresistor features at the same time.  

How does it work? 

NE555 timer has been configured in astable mode and CD4017 works as a decade counter. NE555 can be powered directly or via BC547 transistor. To change the power source, you can use the SPDT switch IR func. The output of NE555 has been connected to CD4017. For each pulse generated by NE555, CD4017 lights up LEDs in a sequence.

A photoresistor has been connected to NE555. This has been used in place of the variable resistor. When the light level falling on the photoresistor changes, the output frequency of NE555 changes and that consequently changes the LED running speed.

Make sure that you use a small piece of heat shrink tube block the light falling on the LDR. We will send you a piece of heat shrink tube.

Operating voltage: 6V DC (Though the video shows 9V, you should use 6V, the voltage should not exceed 9V)

The PCB has been designed in a way that beginners can follow the silkscreen labels to solder the components. The component's name has been labeled properly. There is an assembly tutorial at the end of this page. You can follow that to solder the kit properly. Beginner level knowledge in soldering is enough to build this kit. 

The kit package includes the following 38 components:

1. 1 x Bare PCB
2. 1 x CD4017
3. 1 x NE555
4. 1 x 16 pin DIL socket
5. 1 x 8 pin DIL socket
6. 1 x LDR/photoresistor
7. 1 x TSOP4838 or TSOP1838 infrared sensor. 
8. 1 x Screw terminal- 2 pin
9. 1 x BC547
10. 1 x BC557
11. 1 x 1uF
12. 1 x 100uF
13. 1 x 1P DIP switch
14. 2 x SPDT switch
15. 10 x 5mm LED
16. 3 x 5mm different color LEDs
17. 6 x 1k Ohm resistor
18. 2 x 470R resistors
19. 1 x 470k Ohm resistor
20. 1 x 9V battery connector

Schematic:

Documents:

1. Assembly images- See how the components are soldered on the kit