There was a problem connecting to the electrical load 220V, such as a contactor for switching a power load LC1E25.
For the implementation, the board Leonardo + Ethernet Shield + Relay Module Shield. Connection as in the scheme attached.
The simplest treatment program processes through the WEB-browser controller Arduino and when you click the links generates the inclusion of a particular relay. When on-off contactor is a problem with the network adapter page for the browser begins to be generated is not correct (lost part of the HTML code) can also disappear link on your network card, after a certain number of on-off controller stops responding browser.
Without connection fee contactor relay is working correctly, nothing hangs on the network card, there is no negative impact.
If I try to connect as normal load lamp with a filament, it may also appear to hang network card, but it happens not so fast, require large amounts of on-off cycles.
How can affect switching 220 V on-board relay network card Arduino? How to solve the problem?
I recommend using a separate 5V supply for the relay board and also taking advantage of its opto-isolation feature. For this, do not connect any ground wire from the relay board to the Arduino:
dlloyd's solution should help, and is likely to solve the problem, but you also want to maintain distance and/or shielding between the contactor and the arduino. There is likely to be large disturbances on the lines when these coils are activating and deactivating.
Dlloyd, thanks for your answer!
I tried this connection, now try again. Is more stable, but still has a place to hang the network card and link loss. I would like to be sure that when enabling or disabling the load will not be lost control.
Fabelizer, thanks for your advice! How to protect against electromagnetic interference Arduino?
