ITEM SUPPLIER/PART NO.
❑ SX- 48 Protoboard Parallax/45300
❑ 2x16 Backlit LCD Display Parallax/27977
A non-backlit display will work just as well.
❑ XTAL- 32.768 kHz Parallax/251-03230
❑ Trickle Charge Dallas Semiconductor/DS1302;
Timekeeping Chip Parallax/604-00005
❑ Super Cap Elna/DB-5R5D105;
4 Direction Switch ALPS: SKQUCAA010;
❑ Dual Optocoupler Fairchild Semiconductor/MCT6;
❑ R1, R2, R5 — 4.7K
❑ R3, R4 — 1K
❑ R6 — 22K
❑ R7, R8 — 220 ohms
❑ R9 — 150 ohms
paint the kitchen, I set up my
camera to film it. I used the Now
mode of the intervalometer. In
this mode, the intervalometer
starts triggering pictures immediately, and continues for four
hours. After an hour, a defect
caused the triggering to stop.
After debugging through
the code, I found that I was
using a variable twice which
affected the calculation for the
Now mode. After making a correction, the intervalometer
operated the entire four hours.
I discovered one last defect when
setting the date and time. It was difficult to track down because I was using
an index to write to memory. The
index was one greater than it should
have been, and this affected how information was displayed. When I corrected the index, the defect was resolved.
■ SCHEMATIC 1
Instead of using elapsed time to
trigger frames, the intervalometer
could be modified to accept motion
sensor information. In this manner, the
intervalometer waits until the sensor
detects motion, and then takes a picture. This could be used for photographing wildlife in remote places.
Many cameras have a USB port
which provides for remote operation.
The intervalometer could be modified
to support a USB interface with the
addition of commercially available integrated circuits. While this would
involve hardware and firmware changes,
the intervalometer would support a
wider range of cameras. NV