Tinkering with the desk lamp brought up an omission in our product catalog: a latched relay was clearly missing. This lack has now been made up thanks to the Yocto-LatchedRelay, a latched relay which can also be manually commuted.
The Yocto-LatchedRelay, the latest Yoctopuce relay
For those of you who didn't follow, a latched relay is a relay which keeps its state even without a power supply. Told like this, it doesn't appear to be much. However, if you use a classical relay, such as the Yocto-PowerRelay for example, if you switch it to the B state and then unplug the USB cable, the relay switches back to the A state. A Yocto-LatchedRelay, on the other hand, stays in the B state. Another advantage: while a Yocto-PowerRelay consumes about 80mA in the B state, a Yocto-LatchedRelay consumes 25mA both in the A state and the B state. There is simply a consumption peak during the switch.
Icing on the cake
While we were at it, as a little space remained available on the PCB, we added a small additional functionality: you can manually commute the Yocto-LatchedRelay. A small button enables you to switch the relay. Even more interesting, pads enable you to connect in parallel as many push buttons as you wish.
You can test switching with the button. Pads enable you to connect push buttons to manually switch the relay.
Thus, it is possible to wire a two-way switch which you can drive with an arbitrary number of push buttons and a computer. And it also works if the computer is switched off. Obviously, if you want to switch the relay, the module itself must be powered. A self powered USB hub will do.
Two-way switch wiring with a Yocto-LachtedRelay
Here is a demo of what we can do with a Yocto-LachtedRelay:
Moreover, the Yocto-LachtedRelay is able to switch 8 Amps at 250 Volts. This explains its bulkiness. There you are, you know most of it. I need to go now, I have to upgrade a desk lamp