This product group caters to needs around the home (ICs for security, audio, video, and home
automation are typical). Here are links to the descriptions of all the ICs in this group:
Cameras and CamcordersELM303 - Camcorder Time-Lapse Control
ELM307 - Camera Control
ELM624 - Control L (LANC) to RS232 Interpreter
MonitorsELM334 - Garage Doorman
ELM365 - Security System Controller
Stepper MotorsELM310 - Stepper Motor Controller
ELM311 - Stepper Motor Controller
ELM312 - Stepper Motor Controller
ELM313 - Stepper Motor Controller
ThermostatsELM331 - Solid State Thermostat
ELM341 - Low Power Thermostat
MiscELM337 - Light Switch
This circuit periodically powers up a Camcorder, instructs it to record either 1 or 10 seconds of video, then powers it down again. Programmable for delays of 10 minutes to 24 hours. Requires a camera with a Control L (LANC) port and a power control pin. Handy for those Science Fair projects, or for security surveillance. ELM303P (8-pin PDIP): $8.50 ELM303SM (8-pin SOIC): $10.00
ELM303
data sheet
(37K)
Trigger your still (film or digital) camera from various sources including lightning (using an AM radio), a light beam, an alarm circuit or a momentary switch. A single pushbutton is used for power on/off as well as mode switching, keeping the interface simple. ELM307P (8-pin PDIP): $8.50 ELM307SM (8-pin SOIC): $10.00
ELM307
data sheet
(32K)
Control L or LANC is a standard interface for controlling audio and video devices. It is similar in some ways to RS232, but not enough to allow direct connection to your computer. By using the ELM624, the peculiarities of the interface are translated for you, allowing direct control and monitoring of your favourite A/V machines. If you're looking for help with this chip, be sure to visit Eric Cairon's web site for some great construction plans and software.
Nigel Ealand has used Eric's circuit board, and created a Visual Basic interface to interact with it. As well as offering a free interface program, he has posted the source code for download - be sure to visit his 'Ealing Sub-Aqua Club' site.
For those that don't mind paying for a solution, one source is Applied Logic Engineering. They offer bare boards, complete boards, and software, all for a reasonable price. While you're there, have a look at their RS232 host computer boards that let you send RS232 commands to the ELM624 without needing a computer.
ELM624P (8-pin PDIP): $14.50 ELM624SM (8-pin SOIC): $16.50
ELM624
data sheet
(129K)
This IC was designed to remotely show the position of a garage door, but it can be used with almost any electrical contact. A simple two wire connection is all that is needed to a remotely show position using red and green LEDs, and with the addition of only a few transistors these same two wires can be used to control an output for operating an electric garage door opener, reset a circuit, or generate an alarm. This one is particularly handy for late at night when you're not sure if you closed the door or not. ELM334P (8-pin PDIP): $8.00 ELM334SM (8-pin SOIC): $9.50
ELM334
data sheet
(52K)
All the basics for a home security system, in one 8 pin package. This integrated circuit provides delayed and immediate operation as well as automatic alarm reset after five minutes. Both pulsing and steady outputs are provided for driving a variety of alarm devices. Buy many and create a multizone system! ELM365P (8-pin PDIP): $9.00 ELM365SM (8-pin SOIC): $10.50
ELM365
data sheet
(31K)
One of the messiest parts of getting started with stepper motors is creating the up/ down counters to drive the motor phases. This chip does all of that work for you, so that all you have to supply is a direction and a step input. The ELM310 provides dual modes of operation, easily switching between half-stepping and full-stepping modes, while also providing very high speed bidirectional operation. ELM310P (8-pin PDIP): $8.00 ELM310SM (8-pin SOIC): $9.50
ELM310
data sheet
(34K)
This IC is similar to the ELM310, but only supports the single phase full-stepping mode of operation. This is useful if you only plan to use one mode. ELM311P (8-pin PDIP): $8.00 ELM311SM (8-pin SOIC): $9.50
ELM311
data sheet
(32K)
This IC is like to the ELM310 as well, but only supports the half-stepping mode of operation. Again, this is useful if you only plan to use the one mode. ELM312P (8-pin PDIP): $8.00 ELM312SM (8-pin SOIC): $9.50
ELM312
data sheet
(32K)
This chip is almost the same as the ELM311, operating only in the full-step mode, but it always energizes two phases at a time in order to produce more motor torque. ELM313P (8-pin PDIP): $8.00 ELM313SM (8-pin SOIC): $9.50
ELM313
data sheet
(32K)
Basically a resistance comparator, this device monitors the resistance of a standard (inexpensive) NTC thermistor, compares it to a reference, and provides a control output depending on the relative values. Proportional hysteresis is provided to reduce hunting. ELM331P (8-pin PDIP): $8.00 ELM331SM (8-pin SOIC): $9.50
ELM331
data sheet
(29K)
Very similar to the ELM331, this IC switches to standby mode between temperature measurements, to reduce power consumption. This is convenient for designs that may be required to operate on a backup battery supply for extended periods of time. ELM341P (8-pin PDIP): $8.00 ELM341SM (8-pin SOIC): $9.50
ELM341
data sheet
(29K)
An easy way to interface to light dependent resistors, or photocells. One external resistor sets the threshold point, and internal circuitry provides line frequency filtering, hysteresis, and delay on pickup and dropout of 1 msec to 10 minutes. ELM337P (8-pin PDIP): $8.00 ELM337SM (8-pin SOIC): $9.50
ELM337
data sheet
(28K)
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