Time / Interval Meter

with ATtiny

This project goes to show what little hardware is sufficient to build a versatile Time and Interval Meter with a user-friendly LCD readout. An AVR microcontroller type ATtiny2313 measures the time interval between two consecutive logic level transitions of pulses applied to input pins PD2 and PD3. In the microseconds range, time intervals from 10 microseconds to 30 minutes (!) can be measured with a resolution of 1 microseconds. In the ms range, the available range is 1 ms to four hours at 1 ms resolution.

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Materials

080876-PCB.pdf

080876-11.zip

Gerber file

CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor GREEN and GOLD 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.

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PCB

Download Gerber file: 080876-1-V10

Component list

Resistors
R1,R3 = 10k
R2 = 1k
R4 = 39
R5 = 1kOhm8
P1 = 10kOhm preset
Capacitors
C1 = 22µF 35V radial
C2,C3,C6 = 100nF
C4 = 47pF trimmer
C6 = 22pF
Semiconductors
D1 = 1N4001
D2,D3 = BAT41
D4 = low current LED
IC1 = 78L05
IC2 = ATtiny2313, programmed, Elektor Shop # 080876-41
Miscellaneous
S1 = tactile switch, 6mm footprint
S2 = 4-way DIP switch
K1,K2 = PCB mount terminal block, lead pitch 5mm (0.2")
K3 = 10-way boxheader
X1 = 8MHz quartz crystal
LCD1 = LCD module, 2 lines, 16 characters, e.g. DEM16217
PCB, ref. 080876-I