ELM303
Camcorder Time–Lapse Control
Description
The ELM303 is a specialized circuit for creating
time-lapse videos on suitably equipped camcorders.
The camcorder to be controlled must have a Control
L (LANC) port, and also be capable of responding to
power control signals. This is usually only available
with the mini DIN connectors, and not the 2.5mm
stereo plug interfaces.
The ELM303 provides intervals of 10 minutes to
24 hours between recordings, without requiring any
external timing components. Recording durations of
either 1 second or 10 seconds is also selectable.
One additional feature allows manually triggered
recordings to be initiated when all three interval
inputs are at a low level. Recording will begin
immediately and will continue as long as the inputs
remain low. This combination is fully debounced,
simplifying the interface to mechanical switches.
The ELM303 has been ‘hard–coded’ to send the
Control L hex command ‘33’ (word 1) to device ‘18’
(word 0), and cannot be modified. Be sure to verify
that these are appropriate for your camera before
committing to any designs.
Features
• Delays of 10 minutes to 24 hours with no external
timing components
• Recording durations of 1 or 10 seconds
• Low power CMOS design - typically 1mA at 5V
• Security feature allows on demand recording
• Initial recording after 1 minute to verify system
operation and connections
• Pulsed power output to control camera power
Connection Diagram
PDIP and SOIC
(top view)
V
DD
I2
I1
I0
1
2
3
4
8
7
6
5
V
SS
LANC
Power
D0
Applications
• Time-lapse video recording
• Security monitoring
• Long period time delay circuits
V
DD
Block Diagram
Control L
Driver
D0
Programmable
Delay
I2
I1
I0
2
5
7
LANC
I2
L
L
L
L
H
H
H
H
I1
L
L
H
H
L
L
H
H
I0
L
H
L
H
L
H
L
H
Interval
continuous
10 min
30 min
60 min
3 hrs
6 hrs
12 hrs
24 hrs
V
SS
Control
V
DD
V
DD
3
200ms Pulse
Generator
V
SS
6
Power
Table 1
4
ELM303DSA
Elm Electronics – Circuits for the Hobbyist
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