I am trying out USB serial adapter to drive the relay. I measure that the voltage for the DTR is only 2 volt, which is not enough to drive the relay. The minimum is 3 volt. The usual is 5 volt relay.
Luckily I got my transistor switch ready. I am going to try 2 volt transistor switch to turn on the 5 voltage led power by a USB port.
I have accidentally install visual studio 2008 c#. It is easily to program in c# than c++. I am going to try my serialport little program today.
If everything turns out well, I will go to sim lim tower on wednesday to try out the ac 230 volt lamp.
I wonder how the web able to get 5 voltage from the USB serial adapter. Maybe ge is using a pc than a laptop. It is still impossible. Maybe a 2 voltage can work on certain solid state relay.
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