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Electronic LED Candle

You can blow it out!

Electronic LED Candle
Imitation candles using an LED as the illuminating element are available commercially. But here we’re describing a rather different project with a few unusual characteristics — after all, candles are meant to be blown out!
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Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

Extra info, Update

Technical specifications

* Realistic flame simulation
* Blows out
* Lights via a touch pad
* PIC16F1827 programmed in C, source code provided
* Puff detector based on an NTC thermistor
* Constructional difficulty: average

Resistors (SMD 0603)
R1 = 100Ohm
R2 = NTC, 220 Ohm, Epcos B57311V2221J60 (e.g. Farnell # 129-9912 or RS Components # 706-2702)
R3, R4 = 10kOhm
Capacitors
C1 = 33?F 10V aluminum electrolytic, case C, e.g. Panasonic EEE1AA330SR
C2 = 100nF, SMD 0603
Semiconductors
IC1 = PIC16F1827–I/SS (SSOP20), Microchip
IC2 = CAT4016Y-T2 (TSSOP24), ON Semiconductor
D4 à D11, D15 = LED, yellow, low current, SMD 0805, e.g. Kingbright KP-2012SYCK
D1, D2, D3, D12, D14, D16 = LED, orange, low current, SMD 0805, e.g. Kingbright KPHCM-2012SECK
D13 = LED, red, low current, SMD 0805, e.g. Kingbright KPHCM-2012SURCK
Miscellaneous
K1 = 6-pin pinheader, lead pitch 0.1 inch (2.54 mm)
K2 = 4-pin pinheader, lead pitch 0.1 inch (2.54 mm)
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