On my InMoov I am using a 22 Amp, 6 / 12 Volt adjustable PS. from Pyramid. http://radioproshop.com/pyramid-ps/powersupply.htm It has a voltage & amp meter in front. They also sell PS with higher amp.

The HItec HS-805BB (12) + EZ-Robot servo (12) are supplied by this PS.

The head also contains 4 EZ-Robot servos connected directly to the EZB. everything is supplied by the PS. adjust to 6.3 v.

To keep the system stable, I just make sure not to start all servos at the same time, by inducing a short time delay in each sub assembly.

Still intermittently, even with all servos in a release state, the EZB will start a servo without any command coming from a script. I suspect I will need to increase the voltage to 7 V at the EZB with a voltage regulator.

Hi All,

Thanks for everyone to reply and help!

Hi Steve, My robotics is connected EZB4 x 3 (see attached file)

Question is :

1. This connecting method, is it correct or too complicate?
2. For safety, use 7v 20amp and moving servo quality within 20amp. In this spec., will not damage my servo and EZB-4? Or I can use 5V 60amp with EZB-4 (same as Richard)?

Thanks a lot everyone again! Ricky Ma

For question 1, if batteries are not an option for your robot, then connecting servos directly to a power supply (as in your picture), you will need to connect a common ground between the power supply and the EZ-B as well.

For question 2, either the 7v 20 amp or 5v 60 amp power supply will work fine, but it really depends on how many servos you intend to have moving simultaneously. As long as the voltage you supply the servos are within the minimum and maximum limits for the servo (found in the spec/data sheets), you will be fine and you won't need to worry about that. What you need to work out though, is the maximum amp draw for the servos inrush (the point at when they start to move) when moving them at the same time, add this figure together, and that is the amp range for the power supply you will be looking for (plus a few extra amps on top as a safety margin is a good idea).

For example, if your servo inrush draw is 5 amps maximum, and you intend to move 10 servos at the exact same time, this would equal 50 amps (10x5=50), so a 20 amp supply would not be enough so you would need the 60 amp supply.

If the servos draw 3 amp maximum, and you intend to move 6 of them at the same time, this would equal 18 amps (6x3=18), so a 20 amp supply would be sufficient.

The thing to remember is the voltage has to be in the correct range, but with amps/current, you cannot supply "to much" as the device that draws amps will only take what it needs.

Hi Steve,

I brought a new power supply (5V 60A), But the EZB4 say "battery is low" and without any servo. Pls. see my attached photo as below:

So, is it I need to buy a high Volt power supply(e.g 7.4V, 12V)? or any wrong connecting methods with my EZB4?

Thanks for your help Ricky Ma

Disable the battery monitor in your project. Press the config button on the connection control to disable the battery monitor.

The tutorial for the battery monitor and ez-b power can be found here: https://synthiam.com/Tutorials/Lesson/13?courseId=5

The course for the EZ-B v4, which contains this information and a lot more (including datasheet) can be found here: https://www.ez-robot.com/Tutorials/Course/5

PS, that looks like an adjustable power supply (hence the adjustable value). Ensure you have configured it for the expected voltage output before you begin connecting anything to it. A volt meter will be necessary for checking the voltage. Verifying the voltage will prevent anything from being damaged by exceeding voltages on your servos or sensors.

Appreciated for all experts to reply to me and help! Finally, I used DC 7.5V 46A for the EZB4. It is work for me!

Thanks again!

Ricky Ma