16-Channel 12-bit PWM/Servo Driver ?
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16-Channel 12-bit PWM/Servo Driver ?

by cwc1885 on Sat Oct 13, 2012 8:48 am

Adafruit 16-Channel 12-bit PWM/Servo Driver - I2C interface - PCA9685

We just purchased 2 16-Channel 12-bit PWM/Servo Drivers.

What size of capacitor is used (shown in the photo?)
http://www.adafruit.com/index.php?main_ ... ge&pID=815

Also: How are two of them connected to control more that 16 servos?

Thanks
cwc1885
 
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Re: 16-Channel 12-bit PWM/Servo Driver ?

by adafruit_support_bill on Sat Oct 13, 2012 10:19 am

We should have a full tutorial up shortly. In the mean-time:
The capacitor is not essential in most cases. If you see erratic behavior when moving multiple servos at once, you can add some capacitance. Something like a 470-1000uF @6v or more is a good value to start with.

To connect 2 or more in series, just chain the 6-pins one the end of the board to the next board. A 6-pin cable like this makes it easy. Use a bit of solder to bridge the address jumpers on the upper right of the board. For 2 boards, just bridge A0 on the second board. Its I2C address will then be 0x41.
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Re: 16-Channel 12-bit PWM/Servo Driver ?

by cwc1885 on Sat Oct 13, 2012 4:02 pm

adafruit_support wrote:We should have a full tutorial up shortly. In the mean-time:
The capacitor is not essential in most cases. If you see erratic behavior when moving multiple servos at once, you can add some capacitance. Something like a 470-1000uF @6v or more is a good value to start with.

To connect 2 or more in series, just chain the 6-pins one the end of the board to the next board. A 6-pin cable like this makes it easy. Use a bit of solder to bridge the address jumpers on the upper right of the board. For 2 boards, just bridge A0 on the second board. Its I2C address will then be 0x41.


thank you for the help.
we're looking forward to the tutorial
cwc1885
 
Posts: 42
Joined: Sun May 24, 2009 1:12 am