hi !
i have two questions.
Question (a)
I've seen an example of Arduino UNO (ID: 50) and board amplifiers connected together (http://learn.adafruit.com/thermocouple/ ... ermocouple). When I replace UNO with a Arduino Leonardo (ID: 849), are the pins (5, 4, 3) in the same alignment with Leonardo as with UNO?
Question (b)
On the Leonardo board (ID: 849), is it possible to replace the power supply with the battery. If so – what would be required? How much voltage and how much current should I be applying to the board from the battery?
thank you!
Leonardo board and Pins
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Please be positive and constructive with your questions and comments.
- adafruit_support_mike
- Posts: 67485
- Joined: Thu Feb 11, 2010 2:51 pm
Re: Leonardo board and Pins
Yep. The mechanical layouts (where the pin headers go) are the same. The main difference is that the Leonardo uses a microcontroller that does its own USB, where older UNOs have a separate chip to handle USB. That does create some small programming issues (the serial connection disappears and reappears every time you reset the board), but for basic programming and plugging-in-shields, they're pretty much the same.savard wrote:When I replace UNO with a Arduino Leonardo (ID: 849), are the pins (5, 4, 3) in the same alignment with Leonardo as with UNO?
Again, yes. Running Arduinos from battery packs is common.savard wrote:On the Leonardo board (ID: 849), is it possible to replace the power supply with the battery. If so – what would be required? How much voltage and how much current should I be applying to the board from the battery?
Your best bet is a 4-AA battery pack like this one: http://www.adafruit.com/products/830 You can even add a plug that fits the Arduino's power jack: http://www.adafruit.com/products/369
The Arduino runs at 5v and has an on-board voltage regulator. It can accept external power from supplies between 6v-20v, but prefers 7-12v if possible. A four-pack of AAs works fine. The microcontroller can supply 40mA per pin, but its upper limit is about 200mA at any one time. AA batteries usually have around 2000mA-hrs of energy, which is good for about 10 hours of continuous runtime.
If you want to be fancy, you can use the MintyBoost (http://www.adafruit.com/products/14) which boosts the power from two AAs to 5v and supplies 500mA of current. That will power an Arduino through the USB port, just like your computer does.
- savard
- Posts: 34
- Joined: Mon Feb 11, 2013 12:46 pm
Re: Leonardo board and Pins
hey -
thank you mstone!
thank you mstone!
Please be positive and constructive with your questions and comments.