Adafruit 16-channel PWM/Servo Shield - Using Analoge Pins 4

[Gamaxy]

Hey,

I have the Adafruit 16-channel PWM/Servo Shield and stacked it on a Arduino UNO. I want to run 6 servos in total each controlled with a Potentiometer. The servos are normally attached to the servo pins on positions 0 to 5. And are powered through a external 5V power supply with 6A. The program I am using you can find also in the uploaded files. I soldered one of the adress spots A0 to run the shield at the adress of 0X41, which you would find as well in the code.

The problem would I have right know is, that every servo and every potentiometer works fine, if I use them on the servo pins 0 to 3. But if I want to use 4 and 5 they do not work with the attached potentiometers on analaog pins 4 and 5. It seems to be a problem with the connections A4 and A5.

Is there some communication problem because of pins A4 and A5? Or is it something different?

Thank you in advance for you help!

[adafruit_support_bill]

On the Arduino UNO, pins A4 and A5 are also SDA and SCL for the i2c bus. Since the shield is controlled via i2c, these pins are not available for analog readings when using the shield.

[Gamaxy]

Hey,

is there really no workaround? I dont want to stack up another shield for this. I thought it is just a matter of communication. Setting the adress or frequency or something like this.


Thank you anyway! It is already a good hint.

[adafruit_support_bill]

You can use a different processor that does not share pins A4 and A5 with i2c.
For example, there is the Metro M0: https://www.adafruit.com/product/3505

[cclclrk]

The Metro M0 is still compatible with the PWM shield, right?

[adafruit_support_bill]

Yes. The shield is compatible with the Metro M0.