开云体育

Alan et all

That is a great find. and unlike many of the other relay boards out
there, It has actual specs, documentation and a schematic.

A bit pricey but not bad. In the end I am going to need more than 8
relays though. I looked and didn't find one by these guys. , but the
Amazooooo search engine was designed by a frustrated rat psychologist.
They appear to be a real player in the new tech area (3D printing) , not
just another Great Wall Knock Off shop

I? am starting with this one recommended in an earlier thread a few
months back



But like many there is no real documentation that I could find so far .
It takes 12V DC and has a 5V output regulator which I am guessing could
be used to power the R-PI rather using the USB supply . My remote
antenna switch uses 12V relays

Dave
NR1DX

On 8/14/2021 6:05 AM, Alan Blind, WA9WUD wrote:
> I call that the "plate of spaghetti" phase of the project.
>
> I found these boards were very helpful in cleaning up a project.
> ?Combines a 12v to 5v power supply (RF clean), Raspberry Pi mounting
> and eight GPIO built into the board and wired in, relays.
>
>
> <>
>
> Alan. WA9WUD
>

--
Dave Manuals@...

--
This email has been checked for viruses by Avast antivirus software.

Alan

I just went out and traced/ measured the circuits

1) I stand corrected the 12V board uses 12V relays
2) On this board the T1/D1/R2 is a separate chip (array of 8) tied to
12V bus
3) the Optocouplers output side is tied to the 5V bus (from the LM2576
chip) not the 12V Bus
4) The voltage at idle on "IN1" in your diagram is anywhere from 0 to 5V
depending on how long the pin is has been open? kind of a charge build
up leakage thing I would guess thing (I guess?)
5) A voltage at IN1 anywhere between about 1.35V and 3.6 v will fire the
optocoupler and thus the relay. Above or below these voltages no relay
action
6) R1 is 1K, r2 is I think internal to chip darlington relay driver...I
can send the chip number if your really interested

In general my impression is this board is "OK" to use with the PI...your
thoughts?

If I had a good CAD/schematic program , I would finish reverse
engineering? and publish the schematic

Dave
NR1DX


On 8/14/2021 10:37 AM, Alan Blind, WA9WUD wrote:
> One word of caution.
>
> The 12v board you show is probably of the optical isolation type
> circuit. The "input" side is an optical diode, that when set to
> ground, via the GPIO pin, operates the other side of the circuit, via
> a transistor, with its collector at 12v, where the 12v relay coil resides.
>
> Be sure the "input" optical diode high side is no more than 5v. ? Any
> voltage greater than 5v, will "toast" the GPIO pin.
>
> Since your board references a 5v power supply, it looks like that may
> be the case.
>
> Here is a "typical" relay diagram
>
> Relay.png
>
> Alan
>
> On Sat, Aug 14, 2021 at 9:59 AM Dave / NR1DX <manuals@...
> <mailto:manuals@...>> wrote:
>
>? ? ?Alan et all
>
>? ? ?That is a great find. and unlike many of the other relay boards out
>? ? ?there, It has actual specs, documentation and a schematic.
>
>? ? ?A bit pricey but not bad. In the end I am going to need more than 8
>? ? ?relays though. I looked and didn't find one by these guys. , but the
>? ? ?Amazooooo search engine was designed by a frustrated rat
>? ? ?psychologist.
>? ? ?They appear to be a real player in the new tech area (3D printing)
>? ? ?, not
>? ? ?just another Great Wall Knock Off shop
>
>? ? ?I? am starting with this one recommended in an earlier thread a few
>? ? ?months back
>
>? ? ?
>? ? ?<>
>
>? ? ?But like many there is no real documentation that I could find so
>? ? ?far .
>? ? ?It takes 12V DC and has a 5V output regulator which I am guessing
>? ? ?could
>? ? ?be used to power the R-PI rather using the USB supply . My remote
>? ? ?antenna switch uses 12V relays
>
>? ? ?Dave
>? ? ?NR1DX
>
>? ? ?On 8/14/2021 6:05 AM, Alan Blind, WA9WUD wrote:
>? ? ?> I call that the "plate of spaghetti" phase of the project.
>? ? ?>
>? ? ?> I found these boards were very helpful in cleaning up a project.
>? ? ?> ?Combines a 12v to 5v power supply (RF clean), Raspberry Pi
>? ? ?mounting
>? ? ?> and eight GPIO built into the board and wired in, relays.
>? ? ?>
>? ? ?>
>? ? ?
>? ? ?<>
>
>? ? ?>
>? ? ?<
>? ? ?<>>
>? ? ?>
>? ? ?> Alan. WA9WUD
>? ? ?>
>
>? ? ?--
>? ? ?Dave Manuals@...
>? ? ?<>
>
>? ? ?--
>? ? ?This email has been checked for viruses by Avast antivirus software.
>? ? ? <>
>
>
>
>
>
>
>

--
Dave Manuals@...

Alan

I just went out and traced/ measured the circuits

1) I stand corrected the 12V board uses 12V relays
2) On this board the T1/D1/R2 is a separate chip (array of 8) tied to
12V bus
3) the Optocouplers output side is tied to the 5V bus (from the LM2576
chip) not the 12V Bus
4) The voltage at idle on "IN1" in your diagram is anywhere from 0 to 5V
depending on how long the pin is has been open? kind of a charge build
up leakage thing I would guess thing (I guess?)
5) A voltage at IN1 anywhere between about 1.35V and 3.6 v will fire the
optocoupler and thus the relay. Above or below these voltages no relay
action
6) R1 is 1K, r2 is I think internal to chip darlington relay driver...I
can send the chip number if your really interested

In general my impression is this board is "OK" to use with the PI...your
thoughts?

If I had a good CAD/schematic program , I would finish reverse
engineering? and publish the schematic

Dave
NR1DX


On 8/14/2021 10:37 AM, Alan Blind, WA9WUD wrote:
> One word of caution.
>
> The 12v board you show is probably of the optical isolation type
> circuit. The "input" side is an optical diode, that when set to
> ground, via the GPIO pin, operates the other side of the circuit, via
> a transistor, with its collector at 12v, where the 12v relay coil resides.
>
> Be sure the "input" optical diode high side is no more than 5v. ? Any
> voltage greater than 5v, will "toast" the GPIO pin.
>
> Since your board references a 5v power supply, it looks like that may
> be the case.
>
> Here is a "typical" relay diagram
>
> Relay.png
>
> Alan
>
> On Sat, Aug 14, 2021 at 9:59 AM Dave / NR1DX <manuals@...
> <mailto:manuals@...>> wrote:
>
>? ? ?Alan et all
>
>? ? ?That is a great find. and unlike many of the other relay boards out
>? ? ?there, It has actual specs, documentation and a schematic.
>
>? ? ?A bit pricey but not bad. In the end I am going to need more than 8
>? ? ?relays though. I looked and didn't find one by these guys. , but the
>? ? ?Amazooooo search engine was designed by a frustrated rat
>? ? ?psychologist.
>? ? ?They appear to be a real player in the new tech area (3D printing)
>? ? ?, not
>? ? ?just another Great Wall Knock Off shop
>
>? ? ?I? am starting with this one recommended in an earlier thread a few
>? ? ?months back
>
>? ? ?
>? ? ?<>
>
>? ? ?But like many there is no real documentation that I could find so
>? ? ?far .
>? ? ?It takes 12V DC and has a 5V output regulator which I am guessing
>? ? ?could
>? ? ?be used to power the R-PI rather using the USB supply . My remote
>? ? ?antenna switch uses 12V relays
>
>? ? ?Dave
>? ? ?NR1DX
>
>? ? ?On 8/14/2021 6:05 AM, Alan Blind, WA9WUD wrote:
>? ? ?> I call that the "plate of spaghetti" phase of the project.
>? ? ?>
>? ? ?> I found these boards were very helpful in cleaning up a project.
>? ? ?> ?Combines a 12v to 5v power supply (RF clean), Raspberry Pi
>? ? ?mounting
>? ? ?> and eight GPIO built into the board and wired in, relays.
>? ? ?>
>? ? ?>
>? ? ?
>? ? ?<>
>
>? ? ?>
>? ? ?<
>? ? ?<>>
>? ? ?>
>? ? ?> Alan. WA9WUD
>? ? ?>
>
>? ? ?--
>? ? ?Dave Manuals@...
>? ? ?<>
>
>? ? ?--
>? ? ?This email has been checked for viruses by Avast antivirus software.
>? ? ? <>
>
>
>
>
>
>
>

--
Dave Manuals@...