HSR-5995TG feedback protocol?
HSR-5995TG feedback protocol?
by winchy_matt
Fri Jun 09, 2006 1:50 pm
Hi,
Can anybody help with the HSR-5995TG feedback protocol as described in this PDF:
http://www.robonova.de/store/down/download/files/anleitung_8498.pdf
I have been trying to get the servo to respond to the 50uS feedback pulse, but have had no luck. I have tried several servos, pull-up and pull-down interfaces, but the servo does not respond to these pulses as described in the PDF.
As this is one of the main advatages of this robot servo, it would be very helpfull if someone at hitec could shed some light on the matter. I know there are plenty people who would like to use this feature.
I am currently using 18 of these servos to build a bigger version of this robot:
http://www.micromagicsystems.com/hexapodv3
My guess is that the servo needs to be initialised in a special mode before the feedback pulses are recongnised??
My servo is V1.04 05.08 if that helps.
Many thanks,
M@
Can anybody help with the HSR-5995TG feedback protocol as described in this PDF:
http://www.robonova.de/store/down/download/files/anleitung_8498.pdf
I have been trying to get the servo to respond to the 50uS feedback pulse, but have had no luck. I have tried several servos, pull-up and pull-down interfaces, but the servo does not respond to these pulses as described in the PDF.
As this is one of the main advatages of this robot servo, it would be very helpfull if someone at hitec could shed some light on the matter. I know there are plenty people who would like to use this feature.
I am currently using 18 of these servos to build a bigger version of this robot:
http://www.micromagicsystems.com/hexapodv3
My guess is that the servo needs to be initialised in a special mode before the feedback pulses are recongnised??
My servo is V1.04 05.08 if that helps.
Many thanks,
M@
by bearclaw
Fri Jun 09, 2006 11:43 pm
Hi,
This feedback protocol works with the servos in the robonova without changing anything.
emit a pulse of 50 us, then put the pin in input, pull-up, and wait.
You should read 1 around 5 us later.
Be carefoul though, depending on the pull-up resistance value, the voltage may be too low to be detected (check with an oscilloscope). If it is the case, add a resistance from the pin to the 5V.
This feedback protocol works with the servos in the robonova without changing anything.
emit a pulse of 50 us, then put the pin in input, pull-up, and wait.
You should read 1 around 5 us later.
Be carefoul though, depending on the pull-up resistance value, the voltage may be too low to be detected (check with an oscilloscope). If it is the case, add a resistance from the pin to the 5V.
by winchy_matt
Sat Jun 10, 2006 12:45 am
Thank for the reply.
I am driving the servo from a PIC micro. I have tried using the PIC's internal pull-up, and an external pull up of 47K. I have monitored the events on a DSO, but there is no change on the output pin.
Something is bothering me though. If it is a pull-up type interface, e.g. driven low, after doing the 50us pulse, the port is low, so I have been taking the port pin back to a floating high state and assuming the servo will respond by pulling the pin low and then starting the return pulse of x ms. Is this the case on your servos? If so how long do you leave after the 50us pulse before you return the pin to an input?
Cheers
Matt.
I am driving the servo from a PIC micro. I have tried using the PIC's internal pull-up, and an external pull up of 47K. I have monitored the events on a DSO, but there is no change on the output pin.
Something is bothering me though. If it is a pull-up type interface, e.g. driven low, after doing the 50us pulse, the port is low, so I have been taking the port pin back to a floating high state and assuming the servo will respond by pulling the pin low and then starting the return pulse of x ms. Is this the case on your servos? If so how long do you leave after the 50us pulse before you return the pin to an input?
Cheers
Matt.
