- on Test & Measurement
- Published in issue 7/2005 on page 0
1 MHz Frequency Counter
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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.
The software has been written for a 4.194304-MHz quartz crystal. To enable the microcontroller to be used with an 8.388608-MHz crystal, the program has to be modified as explained in the source code file, and then compiled again.
R1 = 10k
P1 = 1k preset
C1, C2 = 27pF
C3 = 1µF / 16V radial
C4, C6 = 100nF
IC1 = 78L05
IC2 = AT90S2313-10PI, programmed, order code 030045-41
X1 = 4.194304MHz or 8.388608MHz quartz crystal (see text)
LCD1 = LCD Module, 1 line, 16 characters
PCB, ref. 030045-1
project software, ref. 030045-11