Hi, I am searching for a SSR Relais which I can use with a arduino nano to switch another microprocessor unit on and off. I tried one of these common (https://www.amazon.de/gp/product/B08WWG642L/ref=ppx_yo_dt_b_asin_title_o06_s00?ie=UTF8&psc=1) but it seems that the amerage is to low to switch... If I connect my consumer the 12v are beeing reduced to ~2,5v and my consume does not start ...
any suggestions ?
SSR's as you have found are designed for many more amps than you need. As such may not work.
Do you need Isolation?
Btw I expect English is not your primary language. In English the device you are referencing is "relay". However your English is much better than my German.
Is there a common ground between the two processors.
Leo..
I have Heltec Cubecell HTCC-AB02S board which crashes after some hours using the example sketch vom heltec without modifications, others in the heltec community have the same problem , therefore I decided to switch the whole board off and on using an arduino nano... I messured the cubesell is consuming a current of 30ma and 12v.
wawa : the arduino takes the 12 voltage from my battery just like the cubecell so I think they have the same ground ...
Don't know the Cubecell, but it looks like a 3.3volt-logic board that should be powered with 5volt on the Vin pin, not with 12volt. 12volt could cause overheating and uncontrolled restarts.
I would power the Nano (assuming classic v3 Nano) with a 5volt buck converter on the 5volt pin,
(assuming you must use a 12volt battery).
Then use a PNP transistor as high-side switch to power the Cubecell on the Vin pin.
Emitter to 5volt of the Nano, collector to Vin of the Cubecell, base via a 1k resistor to a Nano pin.
A LOW on the Nano pin will turn the board on, a HIGH turns it off.
Use something like a BC327.
Leo..
If you just want to reset the board, you could use the reset pin.
If it was an Arduino, then the stock answer would be
Leo..
Hey Leo, thanks for this idea... the disadvantage of this circuit is that I want to set the nano sleep for 30min after 2 minutes powering the board.... with a HIGH for power off a sleep is not possible and the consume is higher... is there any possibility to switch this behave?
I also testet a low side switch, but this does either not work b/c the board has another ground connection ...
I read of a combination with a NPN trasnsitor which is called a pull-push or totem solution ... can I realize something with this approach ?
Sorry, don't understand. Nano pins can AFAIK stay HIGH or LOW during sleep, and an MCU does not use more power when a pin remains HIGH or LOW. Current is only used when the pin has to drive something. In this case a LOW will draw 4.3mA to ground through the 1k resistor that turns the PNP transistor and Cubecell on.
Leo..
yes you're right .. I thought if the GPIO is High the consume is high ... 
but my multimeter says the same like you .. great to learn this ....
anyway with the BC327 it seems that I dont get enough power so the voltage drops if I connect the cubecell ... so I changed to a S8550 and with this little friend the system works ...
great now Ill do a long term check .. we'll see ...
thanks for your help!
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