- on Home & Garden
- Published in issue 12/2011 on page 60
Electronic LED Candle
You can blow it out!
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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.
* 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
R1 = 100Ohm
R2 = NTC, 220 Ohm, Epcos B57311V2221J60 (e.g. Farnell # 129-9912 or RS Components # 706-2702)
R3, R4 = 10kOhm
C1 = 33?F 10V aluminum electrolytic, case C, e.g. Panasonic EEE1AA330SR
C2 = 100nF, SMD 0603
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
K1 = 6-pin pinheader, lead pitch 0.1 inch (2.54 mm)
K2 = 4-pin pinheader, lead pitch 0.1 inch (2.54 mm)