How do I put an Arduino Uno in sleep mode?

How do I put an Arduino Uno in sleep mode?

Load your sketch and wait 5 seconds for the LED to turn off and the Arduino to go to sleep. After the LED turns off insert the other end of the jumper wire in a GND pin on your Arduino Uno. This will pull pin 2 LOW triggering the interrupt, thus awaking the sleeping Arduino.

How many interrupt pins on Arduino?

Arduinos can have more interrupt pins enabled by using pin change interrupts. In ATmega168/328 based Arduino boards any pins or all the 20 signal pins can be used as interrupt pins. They can also be triggered using RISING or FALLING edges….Interrupts in Arduino.

Arduino Board External Interrupt pins:
Mega 2,3,18,19,20,21

What is interrupt attach?

The first parameter to attachInterrupt() is an interrupt number. Normally you should use digitalPinToInterrupt(pin) to translate the actual digital pin to the specific interrupt number. For example, if you connect to pin 3, use digitalPinToInterrupt(3) as the first parameter to attachInterrupt() .

How do you put an Arduino Uno to sleep?

After the LED turns off insert the other end of the jumper wire in a GND pin on your Arduino Uno. This will pull pin 2 LOW triggering the interrupt, thus awaking the sleeping Arduino. After the LED comes back on you can remove the jumper wire out of GND and 5 seconds later the Arduino goes back to sleep.

Is the Arduino set up for external interrupts?

Please be sure to get the basic external interrupt example working before attempting to follow this entry, this will prove that your hardware setup is correct. Code execution continues where it had previously stopped. The circuit is set up as specified in the Arduino External Interrupts blog.

How many volts does an Arduino Pro Mini have?

Each of the 14 digital pins on the Pro Mini can be used as an input or output, using pinMode, digitalWrite, and digitalRead functions. They operate at 3.3 or 5 volts (depending on the model). Each pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms.

How much battery does an Arduino pro use?

The Pro Mini uses 25mA when awake and 0.57 mA when asleep. As every mA matters when hooking it up to a battery you can see that there is no contest and the Arduino Pro Mini is the winner. Note: As a beginner Maker the Arduino Pro Mini might be a bit intimidating, but there is no reason for it.