PSC , AVR and HS 422 trouble

Robotics India

I have almost tried everything..

I am Using an AT90S8515 with a BASCOM avr code (BASIC) and a bunchof HS-422 servos..

Even though green light on the PSC blinks at the exact intervals according to the code, the servos dont move to the positions..

They get stuck at probably the default position and dont budge..

The code is :

 Dim Ch1 As Byte
      Dim Pw As Word
      Dim Pw1 As Byte , Pw2 As Byte
      Dim Ra As Byte
      Dim Car As Byte
      Dim Ba As Byte
      Ra = 7
      Ch1 = 1
      Ba = 0
      Car = &H0D                                            ' HEx representation of Carriage Return 0D
      Print "!SCSBR" ; Ba ; Car
      Do
      Pw = 350
      Pw1 = Low(pw)
      Pw2 = High(pw)

      Print "!SC" ; Ch1 ; Ra ; Pw1 ; Pw2 ; Car

      Waitms 2000


      Pw = 700
      Pw1 = Low(pw)
      Pw2 = High(pw)

      Print "!SC" ; Ch1 ; Ra ; Pw1 ; Pw2 ; Car

      Waitms 2000

      Loop

The crystal is fine the circuit is fine as the green light blinks.. the power should be fine because I am using 6 pack NiCad 1500mAh batteries or a 10 Amp variable voltage source..

Please help ..

Rao

Robotics India

I put all uC, PSC and motors on the same regulated power supply which can source upto 5 Amps..

And all of a sudden the motor on channel 1 starts to run to a position it cant reach..(when I press reset on PSC)

Probably my problem was that I didnt make common ground for motor and uC and PSC...

Do you guys think Hitec HS 422s have pulse widths different from other servos?? i.e. not the usual 1ms-2ms Pulse width..

I am trying to find out on the internet if it is so.. if someone else has the link or the data, please help me out..

Rao