Nathan tells me new to 2.0.0.15 hservo no longer requires enablehservo.
Again it is not clear to me if you are testing with the body supported. This would eliminate the load on the servos so you can test for proper operation of the servos. Are any of them holding position properly? Are any of them heating up?
My gut tells me your bot is too heavy for 225 servos. They have roughly half the torque of the 645 that we recommend for a 3DOF leg and you are using 4DOF.
The fourth servo added to each leg simply twists the legs upside down, and yea im starting to think that the servos cant handle that much weight. But even when i suspend the body for the servos to move freely, some of them dont, they seem unpowered.
Have you tried powering one leg at a time? If each leg works individually, then you could probably come closer to a solution.
Can we use more definitive terms here? Please define “some”… It really will help. Which servos are not holding position? Are they all in the same block of four? Have you measured the voltage on the pins that the servos that don’t move are connected to? Have you tried swapping a servo that holds position with one that does not to see if the problem follows the pin or the servo? Have any of the servos gotten hot?
Are you using metal standoffs to mount the BotBoard II? If so make sure the standoffs are insulated from the board ground and power plane on the bottom.
Alright, i done a couple of tests, all pins are delivering the voltage correctly, but i just checked my battery pack and it only reads 3Vdc out of 6… although its a new one. unfortunately i forgot to order the charger of the batteries so ill have to buy a battery charger tomorrow to charge the pack, when the pack is fully charged ill test again.
Its kind of a mistake that i didnt check the battery pack voltage the time i unpacked it, otherwise we wouldn’t have wasted much time testing on a half dead battery. Anyway thank you all for your help today, i hope tommorw yields better results.
by the way, i covered the circuit’s bottom with a piece of soft rubber to insulate it.
groan…
Lets just hope the battery pack was the problem xD, im sorry if wasted your time, everyone. 
@PermaFrost: Hopefully you’ve learned that a new battery isn’t the same as a fully charged battery… 
The battery often needs to be cycled several times before its able to deliver full capacity.
well, iguess I got that mistake out of the way 
, going to the store soon for a charger
Good nnneeews everyone !, i charged my battery pack and tried running the robot, the robot stood up so fast it scared me . Thanks to all who took the time to helped make it stand up. whats left now is to make the design more … eye friendly. then ill get it moving in no time 
.
Edit: one more thing, this time the servos are making sound while keeping the body up, they seem to be struggling to keep it up ? whats a good replacement material for aluminium ?, need something lighter
I used 3mm thick Acrylic (I think it’s brand same is Perspex) on my spider robot and it seems to do fine (although it’s a bit wobbly). I hope this was helpful. How thick is the aluminium you’re using?
Acrylic is brittle. Polycarbonate is tough. 3mm (0.125") thickness of either is roughly the same weight as 1.5mm (0.063") aluminum. 1.5mm aluminum is by far the lightest / strongest / affordable solution. Perhaps you could do other things to improve the bot. For example make the tibia much shorter.
Making the femur shorter is a better suggestion…
Doh! slaps forehead. That’s what I meant to say. lol
Im using Aluminium 1.5mm. Im thinking about changing the middle body with something lighter like balsa wood, and trying to avoid making major changes in the body shape like the legs length or servos.
Or use springs maybe?
The
Hitec HS-225BB servos are pretty small. How long are your tibia and femur parts? Was this discussed?
Alan KM6VV
The femur is 75mm and the tibia is about 88mm all measured from center of the servos. i think the vertical servos connected to the waist need to be changed with some thing stronger, since they are the ones lifting the body up and down. i dont think lightening the middle body will solve the problem, especially when walking; 2-3 servos cant handle the whole weight. Any recommendations ?
To help put things into perspective we use a 2.25" femur with 485 (minimum) 645 (much better). Yours is 3" with less powerful servos. Because the torque is rotational the longer the segments the less torque the servo has. Your 225 servos can indeed be used to make a quadruped, but scale it down proportionally. I think you are probably using the best material. You’re just trying to make long Phoenix style legs which can’t work.
then ill have to buy 4 new 645 servos and cut 4 more frames for them. are you sure they’ll be strong enough to hold the body while gaiting ?
