You can use all 20 pins as outputs. However if you do not properly set the modes then what you describe might happen. Have a look at my basic sketcheshttp://blog.blinkenlight.net/experiments/basic-sketches/. Maybe you did not set the modes properly?
You can use all 20 pins as outputs. However if you do not properly set the modes then what you describe might happen. Have a look at my basic sketcheshttp://blog.blinkenlight.net/experiments/basic-sketches/. Maybe you did not set the modes properly?