I've installed a sonoff mini and connected the signal wires to 3 3 way wall switches.
If I try to switch ON/OFF the sonoff using the app, there is no problem, it works like a charm always, but when I do it using the wall switches it just works "sometimes".
For what reasson can it be caused?
Is there any maximum length for the wires?
Should I activate any flag in the app?
Finally a possible solution. I arrived here with the help of a colleague from a Telegram group. I had already given up using the Sonoffs Mini due to this problem. At the time I had found nothing about it. In my case the problem happens when I use SMini on LED lamps that have a drive. In normal lamps, it works without problems. After the update to 3.5.0, the problem is different now. I had realized that the problem was also linked to the length of the cable. I will test the use of the capacitor and if it does not resolve, I will also test the use of the Cat5 cable, which Mello spoke.
I'm having similar issues. Have 4 sonoff mini's in the roof, all 4 powered in the roof space with 2 wires each (S1 and S2) coming down a conduit to a 2 separate light switches right next to each other.
All 4 Sonoff's have the same length wire, and same version of Tasmota running. 1 of the 4 switches is inconsistent with switching on and off.
Just got my 104 capacitors today, going to fit them this weekend. Will report back with findings.
I tested all my Mini Sonoffs with the 100 nF capacitor and the problem was solved. Thanks to everyone who contributed to the solution.
I'm back after doing some tests.
For more information I have attached the installation diagram.
I'm still in trouble.
@Fabio Yasuda, are you using a 474 k resistor?
resistor no, but a capacitor.
Just see the attached diagram that you will understand.