Smooth color transition

This circuit drives 3 LEDs (red, green and blue) to get a soft and smooth color transition from red to violet. With five changing speeds, you can enjoy a colorful show and the random scheme avoids the boring predictable color switching.
A PIC microcontroller is used to generate three different pwm (pulse width modulation) signals. These make the LEDs switch between on and off; changing the time that LEDs are on with the high enough speed, will make thehuman eye sees a change in the brightness of the LEDs.
The kit is very easy to mount and demand just a few components.
Note: light box is needed.


BillRoon (Dec 27, 2015)
Hi AAhdez,

My son and I just built the kit and it blinks one LED (2 blinks then 3 blinks), the other two LEDs light just a tiny bit every once in a while. We have the PCB kit. We followed RonQRP's idea and see that with the IC out and +5 put on pin locations 5,6,7 that the LEDs work properly. No I am wondering if the PIC is not programmed? I bought two kits, and have tried both PICs in the one PCB with the same results. Any ideas? Thanks. It would also be good if you could give more references for the opaque plastic boxes, I haven't found anything yet, and the supplier you mentioned has quite a high minimum purchase order.
AAHdez (Jan 06, 2016)
Hi BillRoon!
If just one LED blinks twice while others are off or flashes very fast, the PIC code is OK, so the problem is in the push-button switch. For normal operation the IC needs high level at pin 2 (+5V).So be sure that the 1.2k R11 is tide to VCC. If a low level still measured on this pin, check the push-button switch, it should be open the connection between pin2 and gnd when released and closed when pressed.
About the box, it can be made of any white transparent material with 3mm (0.25”) wall. I tried with acrylic, glass and foam with almost same results.
RonQRP (Aug 31, 2015)
Hi AAhdez,

I built the kit and it blinks red only, no sequencing. I guess the problem is the switch? If I pull the IC and put +5 on IC pin locations 5, 6 and 7 the respective LEDs light. The schematic and the wiring fix would be nice. I will look for the shcematic you sent.
AAHdez (Sep 01, 2015)
please refer to the circuit and the new kit instruction, in the step 6 you will find the right one.
user ClubRyan (Sep 04, 2015)
It this schematic not correct?
AAHdez (Sep 05, 2015)
that schematic and step by step manual are correct, wrong was erased.
Oregon (Aug 18, 2015)
Do you have the schematic anywhere? I want to create it without wires. thank you
AAHdez (Aug 20, 2015)
Hi, I just send the schematic to Club Jameco team, so it will be in the product page soon. I also fix a wrong connection between the PIC and the push button in the step by step. Now I am working in the PCB version of this kit.
Thanks for your comment
Oregon (Aug 29, 2015)
Thank you - I don't see the schematic there a way I can purchase the schematic and code - I would like to modify it - only for personal use only. Hopefully it is written in C ? Thanks again and I understand if this is an impossible request.
AAHdez (Aug 30, 2015)
Hi, I send to Club Jameco the schematic to release, so I will ask for that again. Sorry, but I can’t give out the PIC code; but please, let me know about what kind of modification you may want so maybe it can be upload to Club Jameco as a different version of this kit.
Braulio777 (Jun 30, 2015)
I have a question for you: Won´t I need any code so that this project functions?

Thanks a lot for your response
AAHdez (Jul 02, 2015)
hi Braulio777

Club Jameco will provide the PIC already programed, so you don´t need any code, just follow the steps and the kit will work.

Thanks for your coment