Can use two 3.7V AA battery?

SpokePOV kit for bikes

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tony18183
 
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Can use two 3.7V AA battery?

Post by tony18183 »

Is it okay to use two 3.7V AA battery to replace two 1.5V AA battery?

brighter LED?

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adafruit_support_bill
 
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Re: Can use two 3.7V AA battery?

Post by adafruit_support_bill »

Two 3.7v cells is way too much voltage. You will burn out the LEDs if you don't fry the processor first.

tony18183
 
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Joined: Mon Dec 19, 2011 11:19 pm

Re: Can use two 3.7V AA battery?

Post by tony18183 »

what is the maximum voltage can take without getting the LEDs or processor fry?

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adafruit_support_bill
 
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Re: Can use two 3.7V AA battery?

Post by adafruit_support_bill »

The processor is 5.5v max. For the LEDs, you need to worry about current. The current going to the leds is controlled partly by the battery voltage and partly be the resistor arrays RN1-RN8. The LEDs are rated for 20mA each.

Details on driving LEDs are here: http://www.ladyada.net/learn/arduino/LEDs.html

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