Home automation
Archiver
Posts: 46,084
I want to use a BSP24 (or more of them) for a home autmation project.
Therefore some questions:
1. Is it possible to hook up two or more serial LCD dsiplays on one
pin (one serial line) and use different adresses for the different
LCD's?
2. Is there on the market not a hardware device which can a) convert
serial "LCD signals" (RS232 or RS485) as generated by the Stamp to
parallel signals so that cheap parallel dsiplays can be used b) with
an internal EEPROM with pre-programmed words or pictures c) with
build-on pushbuttons.
3 If I want to check the status of the rocker wall switches, I can
use a resistor network as described in the book of Al Williams but
this is not very reliable(I think). What do you propose ? I was
thinking on a simple frequency (N555) generator (each rocker switch a
different frequencies of course) build in the backside of the switch
(or wall push button) on one serial line through the house and let
the Stamp listen for a frequency generated by the rocker switches.
4. I think it must be also be possible to connect serial temperature
converters direct on the same serial line as the rocker switches. Or
will this be to complicated?
5 Can someone provide me some information if there is on the market a
relay board (let's say with 8 relays) with a serial communication
(adressable relays)
Thanks.
Therefore some questions:
1. Is it possible to hook up two or more serial LCD dsiplays on one
pin (one serial line) and use different adresses for the different
LCD's?
2. Is there on the market not a hardware device which can a) convert
serial "LCD signals" (RS232 or RS485) as generated by the Stamp to
parallel signals so that cheap parallel dsiplays can be used b) with
an internal EEPROM with pre-programmed words or pictures c) with
build-on pushbuttons.
3 If I want to check the status of the rocker wall switches, I can
use a resistor network as described in the book of Al Williams but
this is not very reliable(I think). What do you propose ? I was
thinking on a simple frequency (N555) generator (each rocker switch a
different frequencies of course) build in the backside of the switch
(or wall push button) on one serial line through the house and let
the Stamp listen for a frequency generated by the rocker switches.
4. I think it must be also be possible to connect serial temperature
converters direct on the same serial line as the rocker switches. Or
will this be to complicated?
5 Can someone provide me some information if there is on the market a
relay board (let's say with 8 relays) with a serial communication
(adressable relays)
Thanks.
Comments
The serial LCD is actually a parallel LCD (44780) with a serial
interface board. You can purchase this board for use with common,
surplus parallel LCD's
I believe Scott Edwards makes the display you require. Scotts'
display has the memory to hold several screens. The typical (44780)
LCD can only store a handful (I believe 8) custom characters. The
display does not have the capacity to store a screen's worth of data.
You would have to commit stam[noparse][[/noparse]p EEPROM for this. Anyway, I believe
you can see the display you require at http://www.seetron.com
Multiple LCD's can share a common data line, the enable line can not
be shared. Many devices can hang on the data bus, a device only pays
attention to what's on the bus when it's selected (enabled. Enable
(or chip select) lines are not shared.
As for reading switch closures I would use a shift register to
conserve pins as opposed to a resistive ladder. More reliable, less
code, faster execution. If not a shift register than maybe a 3 to 8
line converter. Easy chip to use, off the shelf at radio shack. they
have the data sheet and app notes...
Regards
Rich
--- In basicstamps@y..., "daliti" <peter.christiaen@s...> wrote:
> I want to use a BSP24 (or more of them) for a home autmation
project.
> Therefore some questions:
> 1. Is it possible to hook up two or more serial LCD dsiplays on one
> pin (one serial line) and use different adresses for the different
> LCD's?
> 2. Is there on the market not a hardware device which can a)
convert
> serial "LCD signals" (RS232 or RS485) as generated by the Stamp to
> parallel signals so that cheap parallel dsiplays can be used b)
with
> an internal EEPROM with pre-programmed words or pictures c) with
> build-on pushbuttons.
> 3 If I want to check the status of the rocker wall switches, I can
> use a resistor network as described in the book of Al Williams but
> this is not very reliable(I think). What do you propose ? I was
> thinking on a simple frequency (N555) generator (each rocker switch
a
> different frequencies of course) build in the backside of the switch
> (or wall push button) on one serial line through the house and let
> the Stamp listen for a frequency generated by the rocker switches.
> 4. I think it must be also be possible to connect serial
temperature
> converters direct on the same serial line as the rocker switches.
Or
> will this be to complicated?
> 5 Can someone provide me some information if there is on the market
a
> relay board (let's say with 8 relays) with a serial communication
> (adressable relays)
> Thanks.
network as described in the book of Al Williams but
> 5 Can someone provide me some information if there is on the market
a
> relay board (let's say with 8 relays) with a serial communication
> (adressable relays)
> Thanks.
Hello,
In answer to question 5, I have used a serial controlled relay board
made by National Control Devices. It was a bit pricey but it worked
VERY well. Try them at www.controlanything.com.
Good Luck!
John Prestley