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I want o control a servo with a micro controller and I need more torque so I chose a 7.4V battery. Power my micro controller requires only 3.3V and obvious if I try to power it straight from this battery it will fry. Is there a way I can get the 3.3V to the micro controller and the 7.4 to the servo all from this same battery?

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3 Answers 3

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What you need is a 3.3v voltage regulator for your micro-controller like LM2937-3.3. The schematic shows you how to connect your servo to the micro-controller. The servo uses the 7.8v from your battery and is controlled from your micro-controller with a PWM output. Double-check the maximum power supply your servo can handle just to be sure.

schematic

simulate this circuit – Schematic created using CircuitLab

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You can use a regulator like an LD1117V33, but it's going to dissipate the extra 4.1V as heat. With only 400mAh available, you might want to consider a more efficient switching regulator like the LM2576.

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The easiest way is to use a 3.3V regulator. There are plenty on the market.

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