The original article describing how to use the VNWA in conjunction with two RF relays
implied (correctly) that the relays could be controlled directly from the VNWA. The
current software embodies support for using the VNWA in conjuntion with an external
Anyway, attaching a wire to the USB board looked easy enough, there is even a pad on the board for the wire. However, getting the wire out of the enclosure was not so easy. In the original article, and others have done the same, a 3.5mm jack socket had been fitted. I wasn’t keen on that idea since such connectors can be pulled out and I wasn’t happy with the idea that this might happen and maybe short the connection to 0V.
Another solution was to use a stand-
This is a tidy solution but it would require obtaining and programming an ATTiny45 microcontroller. More on that later.
I even found Peter DC2PD’s article on using a latching relay as an S-
Peter was even able to power his 28V relay from the USB port. I wasn’t so fortunate … more on that later too!