Hi,
I am having a problem powering my Arduino UNO due to the low power 9V battery that are available for my use.
I am thinking of using two Panasonic CGR18650HG 3.7V 3800mAh Lithium Ion Battery to power my Arduino. I am Thinking of connecting these in Series to give me a supply voltage of 7.4V... Please are there disadvantages of using such power sources on arduino?
The small PP3 style of 9v battery is useless as it cannot provide enough current.
The specs say that the recommended voltage for an Uno is 7 to 12v so your 7.4v battery should be fine.
A pack of 6 x AA cells is another alternative.
...R
It all depends on what you are powering - is it just the UNO, or is it the Uno and some LED's, etc?
You should be fine providing power using 2x CGR18650HG cells. You are well within the spec for the uno (7-12v).
Regarding the PP3 9v battery... The PP3 battery should be able to provide enough current for the atmega (it draws less than 100mA, and the PP3 type batteries can provide ~500mA). If you're having problems with current, you can use a capacitor and inductor in order to provide the additional current during peak operation.
Thanks a lot guys for your assurances that the power source I want to use will be just fine... I will be powering the Arduino Uno, Two PING))) Ultrasonic Sensors, A Futaba S3114 Micro-Servo and a TSOP31138 IR Sensor. But these all will not be on operation at once.
First, the PING))) Ultrasonic sensors will be powered for object detection... Once an object is detected and avoided, the PING)) will stop pinging.... Then the servo and the IR Sensor will be powered for operation at the same time... After completing their tasks, they are to stop operation. Afterwhich the PING))) sensors and collision avoidance will begin. So goes the cycle...
Will it be far better if I connect 3 of these CELLS (3.7V 3800mAh Lithium ion power source) to give 11.1V 3800mAh seeing that the other components will be powered by the Arduino UNO?