Hello everybody, i am a new member here who has to fix some failures of a project with GHI devices
First of all, sorry for my bad english
I got a project which sometimes restarts after switching some relays on the relay module 1.2
i cant find any datasheet about it and i hope someone has a datasheet of it, i just got the eagle .brd and .sch data
i also want to know where i can find a datasheet with characteristics of the FEZ Raptor Module, cause there is just the mainboard with some specifications on the homepage (link: https://www.ghielectronics.com/catalog/product/499)
I have to know how much current the board needs and how much current and voltage the GPIO can give because i think something on my board needs to much current
i also got the SD Module on it
so a datasheet with some characteristics of the Relay Module 1.2, the FEZ Raptor Board, the USB board and the SD card device would be very nice, i hope something like that exists, i really cant find anything about that in the internet
thanks for every help i will get from someone of you
Gus: I found this datasheet about the g400 thank you for that, but i couldnt find how much voltage the GPIO of example can give to any connected device.
Yes i know that i shouldn’t use any discontinued products but that device was already on that project ;), but you are right the schematic is really simple to understand, should be enough to understand how it works.
Yes i also think that this has something to do with a voltage drop,
so a quick overview about how everything is powered:
The 230V from the powerpoint is connected to a power pack, which has a 24V output.
The relay board is switching on and off a compressor, which needs 230V
the second device is an air cleaner or something, which also needs 230V
and the third device is a outlet which needs 24V
The Usb Modul is powered by the 24V(its 27V) 1.8A, and also a selfmade circuit board (there are on the same connection)
If i run my programm and put the air cleaner and the compressor on, there is no problem, also to with the outlet on is no problem, but 90% of the time, if i am at the end of the programm where i switch the 3 devices off, the programm starts new, it feels like there is not enough current for the relay modul to switch all three or sometimes just the two devices off,
just 10mA? so eg. is it possible to controll the three relays at the same time, as i saw the schematic of the relay board i thought they would need much much more then 10mA to controll them
well the cable are near to each other if you mean that, the devices are far enough away from each other. Do you think sometimes it could be a problem if the cable from the devices with 230V are too near to each other?
a transistor means you don’t need to supply a large current directly with the pin, so that should be fine.
The GPIO cables should all be well away from 230VAC lines. A simple relay just simply breaks the AC wave at any point, which has a whole heap of electromagnetic implications; a more effective method would be to use a zero-crossing detection relay. Also, relays themselves generate some back EMF when switched off, and an SSR might also help reduce the impact.
I guess the good news is you’ve proven the design to a point; now to do it “completely” and resolve these lingering issues you may to go to the trouble of creating your own circuitry. There’s a thread of an opto-isolated triac board over here too https://www.ghielectronics.com/community/forum/topic?id=16567&page=3#msg164203 that might also go a long way to help resolve your potential issues, if only you can convince @ Jason to sell you one (if he has any)
yes the transistor should be fine, was just a problem of thinking
but i didnt know that the relays could make a huge problem when switching off, and there is my problem i guess, i will check that and try to fix it and if that was the problem i will write a little report about that
but anyway, you helped me a lot with that information, thank you