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4 changes: 2 additions & 2 deletions docs/guide/build_hardware.md
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Expand Up @@ -177,9 +177,9 @@ The PCA9685 Servo controller can control up to 16 PWM devices like servos, motor
* SDA is board pin 03
* SCL is board pin 05
* Wiring
* SDA and SCL may be through a shared bus rather than a direct connection between nano and PCA9685 if other devices are using the I2C bus (like an OLED display)
* SDA and SCL may be through a shared bus rather than a direct connection between Raspberry Pi and PCA9685 if other devices are using the I2C bus (like an OLED display)
* 3.3v VCC power may be provided by a 3.3v pin on the GPIO bus (typically board pin 01).
* 5v VIN should NOT be provided by the GPIO bus because motors/servos may draw too much power. Most Electronic Speed Controllers actually provide the necessary power via the 3 pin cables that get plugged into the PCA9685, so it is generally not necessary to provide power directly to VIN.
* 5v VIN should NOT be provided by the GPIO bus because motors/servos may draw too much power. Most Electronic Speed Controllers(ESC) actually provide the necessary power with an onboard Battery Eliminator Circuit(BEC) via the 3 pin cables that get plugged into the PCA9685, so it is generally not necessary to provide power directly to VIN.
* All GND must be common ground. On the GPIO it is usually easiest to use GPIO board pin 09 for ground. Once again the 3 pin cables from the ESC carry ground and the PCA9685 connects this to the GPIO via the GND pin.

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