This is where solid-state relays (SSRs ... in a design is that they generate more heat than an equivalent relay. Similarly, the main shortcoming of relays in the design is that they are at ...

But what if all you have on hand is an ESP8266? [TechColab] needed to control a solenoid valve with a short pulse via a solid-state relay (SSR) but found that the trusty 555 timer was tricky to ...