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ELM303 Datasheet(PDF) 5 Page - ELM Electronics |
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ELM303 Datasheet(HTML) 5 Page - ELM Electronics |
5 / 5 page Example Applications 5 of 5 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 second recordings 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 ELM303 ELM303DSA Elm Electronics – Circuits for the Hobbyist < http://www.elmelectronics.com/ > Figure 2. Alarm Triggering Figure 3. Time–Lapse Controller Alarm Contact +5V 0.1µF 1 2 3 4 8 7 6 5 120 Ω 120 Ω 5 4 3 2 1 +5V 22K Control L mini DIN Cable Connector (male) 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 Control L mini DIN Cable Connector (male) + 1 2 3 4 8 7 6 5 33K VDD = 4.5V 33K 33K 33K Duration closed = 1 sec open = 10 sec Period Set as per Table 1, closed = L and open = H 0.1µF 120 Ω 120 Ω 5 4 3 2 1 VDD |
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