Re: LF: Windows software to drive a relay at a given time?

[Andy Talbot <andy.g4jnt@gmail.com>]

I used to have quite a few of an older type of those - given to me surplus.   An RS232 drive signal will drive one quite happily - they are designed to be driven from logic signals.

The 25A rating would be enough for your PSU, I think mine were rated at a bit more.

Andy  G4JNT

On 12 April 2018 at 09:21, Chris Wilson <dead.fets@gmail.com> wrote:

Hello Peter,

Neat, and thank you, but clicking on Andy's exe file is temptingly
simple to a PC ignoramous like myself ;) I wonder if a serial port
would drive something like this directly, or would a big input surge
be likely to kill it?

http://uk.farnell.com/opto-22/240d25/relay-solid-state-dc-25a-280vac/dp/1839015

Wednesday, April 11, 2018, 6:03:07 PM, you wrote:

> Hi Chris,

> On 11.04.2018 12:16, you wrote:
>> ...
>> Software to close a relay at a given time, perhaps via the serial port?
>> ...

> Seven lines of "Python" and a relay circuit connected to com1, RTS-pin:

> # import libraries:
> import serial # see https://pythonhosted.org/pyserial/
> import time   # needed for time delay ("sleep()")

> # Create a connection object to com1:
> com = serial.Serial('com1', baudrate=9600, bytesize=serial.EIGHTBITS,
> parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, timeout=1,
> xonxoff=0, rtscts=0 )

> com.setRTS(True)  # CLICK!

> time.sleep(60)    # Wait 60 sec. or whatever

> com.setRTS(False) # CLACK!

> com.close()
> # END

> Use the standard system tool "Windows Task Scheduler" to run it at a given
> time. I did not check it on Windows, but on Linux (device name changed and
> using cron) it works driving an old rtty-relay ("Kleinpolrelais") from
> Siemens directly.

> Peter, df3lp

--
Best regards,
 Chris                            mailto:dead.fets@gmail.com