All Commands

• A digital pin output can be set to true or false. (Use the operators true :: operators boolean or false :: operators boolean.)
• A PWM pin output can be set to any value 0 through 255.
• A digital reading input is either true or false.
• An analog reading input is a number from 0 to 1023.
• Divide analog reading inputs by 4 to use the in PWM pin outputs. Using a larger number will work, but the actual effect wraps around to zero every multiple of 256.

Snap4Arduino Blocks

set digital pin ( v) to <> :: #468cfc

analog reading ( v) :: #468cfc reporter

set pin ( v) to value (128) :: #468cfc

digital reading ( v) :: #468cfc boolean

arduino connected? :: #468cfc boolean

connect arduino at [] :: #468cfc

disconnect arduino :: #468cfc

set servo ( v) to [clockwise v] :: #468cfc

Interesting Facts

• Analog means continuously adjustable. Analog devices you know: bicycle brakes, dimmer switches on (old incandescent) lights, knobs on stove to adjust gas temperature.

• The Arduino can use Pulse Width Modulation vary the brightness of LEDs. Pulse Width refers to the fraction of the time that the electricity is on. Modulation means changing. Translation: the Arduino controls brightness by changing the fraction of time the electricity is actually delivered to the light. Read more about pulse width modulation.

• PWM output is sometimes called “fake analog”. The computer pretends to have a light on 50% brightness by turning it on full blast for 50% of the time and off for the other 50% of the time (switching back and forth very fast so the human eye cannot see the transition).