Resolved by Steve G!
I'm running a 12 volt 3 amp power supply. Then I have a 12 volt to 6 volt DC step-down to power my EZ-B4 and servos. After the robot runs a little while sometimes the servos stop responding. But most often If I run a script to put the robots arm on its hip, sometimes it will work. Other times the arms will start to move and then the EZ-B4 will disconnect and then reboot.
I have also seen that after running a while the servos in the arms will start to run slow and not quite make it to there assigned spot. While the servos in the neck keep right on going like normal.
So I was thinking we did not have enough AMPS for all the servos. See I have 2 servos in each shoulder, one servo in the elbow, two servos in the wrist and one in the hand for a total of 6 servos in each arm. + 2 servos in the neck.
Test 1 I started to look at the power supply. Maybe we do not have enough AMPS. So I grabbed one of R2D2's 12 volt 18 amp hour battery. R2 was not vary amused to see one of his battery's wandering off. While the servos ran a tad bit faster I soon ran into the same problems.
Any ideas? confused
ah thank you bolt
Well folks, Thank you all for your input. It seems you where all right at some point. The 12 volt 3 amp power supply could not deliver the needed amps. Then as Steve G was asking what a bought the 12 volt to 6 volt converter. Gee its only rated at 3 amps. HHmmm... Bottle neck found. So I used 4 of my R2 battery's at 12V 7 amp hour. the 12 volt 18 amp hour set is being charged for tomorrow. But the 4 12 volt 7 amp hour battery's with 3 of 12 volt to 5 volt converters in series gave me 10.5 amps. Now funny things are a happening, the darn thing works fine!
Sorry I did not reply faster. I have to disconnect my PC from the internet to use my EZB-4. If I connect my EZ-B 4 to the wifi network the cam will not work, even when I use the IP finder to get both the EZB4 and cam on the same IP. But that's a problem for another day. Thank you all vary much.
Richard R, You where right on as well.
Thanks
No problem. Glad I could help.
And thanks Richard.
Linear power supplies will suffer delivering their specified amperage - this is an inherit limitation to the design of a linear power supply.
If you want sufficient power for servos, then a digital switching power supply is what you require - I recommend an ATX power supply from a PC.
DJ,
Humm good idea on the ATX power supply. I seem to have a few of those kicking around.
Thanks.
I'm having same problems with the android head. Its connected to my to my Powerwerx SPS-30DM which is designed to supply 25 Amps continuous and 28 Amps surge. The neck servos are the Power HD 1235mg, they are rated at 7.4v and stall torq can be as much as 9 amps. I've never seen the amps go above 2 amps, but i have the exact same problem, as times passes the servo exhibits odd behavior and then eventually the EZB reboots. How is it possible I don't have enough amps with that power supply?! Am I missing something?
Edit: could wire gage be an issue?
@fxrtst Put it on a lipo battery to test.. if it stops rebooting then it is your power supply causing the issue.. If the ezb continues to reboot check you wiring is of the appropriate gauge to supply those amps... I use 14g battery wire to my servo board and ezb... Perhaps over kill, but I have no issues driving 26 servos on my inMoov using a 6V SLA battery....