I am working on a project that includes a scanning switch matrix. It also includes a joystick with an integrated push button. I am out of IO pins on the micro, but there are gaps in my switch matrix, ...
I have devices with several similar boards, all of which are basic computers (with CPU, RAM and ROMs etc.). They all interface to the I/O unit via a standard connector, although the connectors aren't ...
I am trying to wire up a LED matrix using a FET transistor as a switch. The AVR will be connected to the gate. To turn the LEDs on I have drive the pin connected to the transistor gate low, right?