User Manual

Powering Servos

The power input section of the HAT and Bonnet are

both on the left hand side.

The HAT has both 2.1mm DC jack and a terminal block

The Bonnet has a spot for

either

DC jack or terminal

block

Powering Servos / PWM

The drivers have two power supplies. One is VCC - that is the 3.3V power from the Raspberry Pi, it is used to power the

PWM chip and determines the I2C logic level and the PWM signal logic level. This supply will always be on if the Pi is

plugged in and working, check the PWR LED on the Pi (it's the red LED on the Pi 2, 3. Pi Zero does not have a PWR

LED, look for a blinking activity LED)

To power servos you will need to also connect the 5-6V V+ power supply - this is the power supply for the servos. (If

you are lighting up single 20mA standard draw LEDs you may not need this power supply, but I'm assuming you want

to use servos here.) This power supply should be 5 or 6VDC, most servos work well at 5V and if you give them 6V will

be a little stronger.

You can connect this power through the terminal block or the 2.1mm DC jack. There is reverse-polarity protection in

case you hook up power backwards, however you should use

either

the DC jack or the terminal block, not BOTH!