Infrared remote control, wireless keyboard with trackball or touchpad
Customized mini pc included industrial pc, htpc and thin client
Mini-itx motherboard, dom, ssd, pc chassis and power supply
|>>Your Current Position: Interface Receiver|
Remote control receiving part of the custom at the following situations:
customers do not want to design a separate remote control receiver but
the remote control directly to the main equipment to decode the signal,
SoC system, the majority of the case, then I can offer the following solution:
First, the original remote client do not have to change the decoding process,
the needs of customers with our strict encoding format designed this format
of the remote control code corresponding to the purpose; Another method
is to provide remote control of our detailed coding specifications, the
design of new customers this decoding process. Right is a set-top boxes
with built-board receiver circuit of the relevant local plan, our company
can provide customers a variety of chip-chip interface protocol (14SOP/18SOP/20SOP
UART chip and the chip is suitable for short-range
communication between the choice, I generally provide TTL-level compatible
with the high output state idle "9600,8, n, 1" format, that
is, communication rate of 9600bps, 8 data bit, 1 stop bit, without parity
bit. Essentially all of the microprocessor from the grade of a simple
machine, four machines, 8-bit machine to a complex 32-bit embedded processor
can direct UART interface or directly to the UART format simple signal
analysis and decoding than deal directly with the infrared remote control
signal to the code much simpler.
In line with the standard RS232 interface that is
often referred to as COM port serial interface, from the sense signals
RS232 and UART format is basically the same thing, the most important
difference is that RS232 level must meet the RS232 specifications, standard
RS232 electrical level range is-12V to +12 V, the norm that is not free
when the case of data output for-12V, is for this reason that the specifications
can be used RS232 data output to further afield.
Keyboard to PC as an example, the keyboard has two parameters directly affect the operator's use of the habit. A response time parameter is the repeat (DELAY value), a parameter is the repeat rate (RATE). Click the General button on a code, but sometimes need to enter a string from the same site or a certain amount of adjustment for players such as the volume, then repeat after the keyboard is made of code on the necessary time for a little longer keys For example, do not open 500ms, the second the same code values will appear, this is the repeat time 500ms response time, according to a large number of tests show that at least duplicate the response time set to 250ms. Press the button does not release a long time, and the third, the fourth key will be created to appear in the number of second repeat button to repeat key rate used to show that in general is a key-per-second 10-30.
Because, taking into account
the flexibility of the back-end design, in the remote control transmitter
can not consider this level of response time to repeat, so as long as
the button will send a string of code, a range of repetition rate of 25ms-300ms
between, 100ms most about. If not specified, I am the company's products
are used in ordinary serial code of the remote control button to take
a way one yards. Customers can specify custom requests can be continuously
made some key code, such as video conferencing systems, there are some
keys to adjust the camera's aperture, Yuntai of rotation, the amount of
these adjustments for the use of key code for hair treatment operate more
smoothly and quickly. If a button or take a yard can be a way, the effect
is, click the button raised, the equipment moves you, once again press
the button, then move some equipment, and so repeatedly, the time between
the two keys to have a certain intervals, must be greater than to repeat
remote control codes such as the hair cycle code 100ms. Code re-issued
to deal with fat is a relatively tedious work, demanding real-time, or
will directly affect the use of the effect of the final product.
IrDA is the time for the equipment and infra-red data communications design, communication, high rate, much higher than the general control of the remote control code flow, high-speed data communications at the same time means that the design for the infrared receiver to receive from the very limited, at the same time need to prepare a dedicated driver.
IRDA is a lot of customers think that the design for the infrared remote control, this is a misunderstanding, IRDA more for high-speed infra-red data communications and design, you can see the following article:
V.PS/2 interface customization:
PS/2 interface is a PC or other similar structure
of the embedded PC platform supports the standard input interface, including
the PS/2 keyboard and PS/2 mouse, that is why in accordance with the
PS/2 protocol designed to receive the remote control does not require
any adapter the driver can direct the use of natural and nothing to do
with running the operating system, of course, there are some special function
key is to expand, with the motherboard and operating system are closely
related, such as support for ACPI agreement Power, Sleep and Wakeup keyboard,
as well as Microsoft Windows support for the expansion of the keyboard
such as the media WWW, Email, Mute, etc..
VI.Custom USB interface:
USB interface using four-wire connection, namely VCC (power), DATA-(data -), DATA + (data +) and GND (to).
VII.Interface Specification CIR and CIR custom adapter
VIA EPIA motherboard CIR provides an interface very similar to PS/2 interface, the pin generally IDC5x2 form.
In view of this CIR interface that CIR adapter specially designed collection of different types of remote control models (as required by the customer to design, production), EPIA into the host to identify the signal. The device in the digital entertainment set-top boxes and PC-type devices widely used. I, as a third-party equipment suppliers VIA can provide CIR-related technology and products, both designed and manufactured adapter CIR can also be designed and manufactured, including a remote control transmitter, remote control keyboard, mouse, such as remote control, they can even provide the corresponding low-level software development, sales of such products only to the equipment manufacturers, systems integrators, end users do not provide for such products.
Production of such products, customers need to give full consideration to the size of the motherboard and chassis structure, taking into account possible future changes in machine design.
Right is a practical example of the ML with the VIA EPIA series motherboard design, specially designed 22-point infra-red sensor, a board to front board installed in the form of the machine on the front panel, one is external through 1.5 m long wire leads, at the desktop. For example, the hotel set-top box terminals, and some hotels will be set-top box terminal at the desktop, this time can use the built-in receiver board; Some hotels will be placed under the table set-top box terminals, built-in receiver board it will be difficult to play a role, At this time the receiver can be placed in an external desktop.
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