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PDF ELM303 Data sheet ( Hoja de datos )

Número de pieza ELM303
Descripción Camcorder Time-Lapse Control
Fabricantes ELM Electronics 
Logotipo ELM Electronics Logotipo



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No Preview Available ! ELM303 Hoja de datos, Descripción, Manual

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.
www.DataSheet4UO.cnoemadditional 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.
Applications
• Time-lapse video recording
• Security monitoring
• Long period time delay circuits
Block Diagram
D0 5
Control L
Driver
Programmable
Delay
Control
I2 2
I1 3
I0 4
VDD
200ms Pulse
Generator
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)
VDD 1
I2 2
I1 3
I0 4
8 VSS
7 LANC
6 Power
5 D0
VDD
7 LANC
VSS
VDD
6 Power
VSS
I2 I1 I0 Interval
L L L continuous
L L H 10 min
L H L 30 min
L H H 60 min
HL L
3 hrs
HLH
6 hrs
H H L 12 hrs
H H H 24 hrs
Table 1
ELM303DSA
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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ELM303 pdf
ELM303
Example Applications
The circuits on this page show two different
configurations for the ELM303. In each case, one should
keep in mind that these are experimenter circuits that
require some extra care to protect against electrostatic
discharge, etc. The other concern is the possibility of
backfeeds from the two different power supplies
(camcorder and ELM303). To prevent damage to the
ELM303, always make sure that it is powered up before
connecting to the camcorder.
Figure 2 at the right shows the ELM303 in a typical
security configuration. The internal pullup resistor on pin
4 is used to advantage to keep I0 and I1 at high logic
levels while the alarm contact is open. With I2 at a low
level and D0 at a high, this configures the circuit for 10
www.DataSheeste4cUon.dcormecordings every hour. Note that all three
resistors shown are for ESD protection, and aren’t
necessary for circuit operation.
When the alarm contact closes, the three ‘I’ inputs
are all at a low level, causing recording to start and
continue until the contact is released.
Figure 3 is a programmable system using ‘DIP’ type
switches to allow the settings to be changed as needed.
Power is from three AA size alkaline cells, which give
approximately 4.8V when fresh. Strictly speaking the
supply should be at 5V to be consistent with the Control
L (LANC) system, but in practice, this works quite well.
Three cell battery holders are available for this type of
application, but if one can’t be found, shorting out one
position in a four cell holder will accomplish the same
thing. Of course, a regulated 5V supply would be
preferrable if one were available.
Operation of either circuit is similar. The ELM303
circuitry is powered up before connecting it to the
+5V 0.1µF
1
2
3
4
22K
Alarm
Contact
8
7
6
5 +5V
120
120
4
2
1
5
3
Control L mini DIN
Cable Connector (male)
Figure 2. Alarm Triggering
camcorder, and the camcorder is powered and placed in the
camera / standby state. The cable between the two is then
connected and approximately one minute later, the camera
will record one sequence, and will power down. After the
duration set by the Interval pins, recording will be initiated
again.
Some cameras do not have power control inputs, so will
require additional circuitry in order to take advantage of the
power control capabilities. A toggle type circuit (driven from
the power output pin) could be constructed for this purpose
by the more adventurous experimenter, but is beyond the
scope of this document to describe.
Experimentation will determine the best settings to use
for each of your applications. For plant growing experiments,
try using the 60min / 1sec setting. You will find that 1 second
is a little long for creating your own animations, but may be
just right for others…
VDD
33K 33K 33K
VDD = 4.5V
+
0.1µF
18
27
36
120
120
4
2
1
5
3
Period
Set as per Table 1,
closed = L and open = H
45
VDD
33K
Control L mini DIN
Cable Connector (male)
Duration
closed = 1 sec
open = 10 sec
Figure 3. Time–Lapse Controller
ELM303DSA
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
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