i have brought the picaxe microcontroller book by David Lincon and for my solenoid it tells me to add a NPN Transistor but i do not know what value or type so can some one help me. Thanks
See also the picaxe_manual3.pdf and look
at Standard Interfacing Circuits, page 5.
And while you are there get 1 and 2 then place
all 3 documents on your Desktop
They are all free to download here, use the
Datasheets Link at the top of this screen.
Or, you could just use the little, tiny, latching relays mentioned in an earlier post to run the solenoid at up to 2A. ;-) A nice, mechanical, solution. None of those newfangled transistor things needed. %->