Unable to get this model of servo working on BlackBox 4X. When setting up the pen wizard the servo responds to a very limited range of values around 210-230, however once setup is done it does not respond to pen UP/DOWN commands at all. - I have other servos that work as expected, no issues at all using the full range 0-255 values. - This servo was tested with a micro servo tester and it works as expected, as other servo models. - Wiring is correct matching other servos YRB. Wondering if I am missing something with this particular model in terms of specs? KP-DMC809 Description KPower Digital Metal Gear 9g Coreless RC Servo (DMC809) Motor Type: Coreless Motor Gear: Titanium Ball Bearing: Dual BB Torque: 3.0 kg-cm / 4.8 V Speed: 0.08 sec / 60° / 4.8 V The KPower Digital Metal Gear 9g Coreless RC Servo (DMC809) offers a dual BB ball bearing and it comes with a titanium gear. It provides torque at 4.8 V is 3.0 kg-cm and 6.0 V is 3.8 kg-cm. This RC servo is used in RC cars, RC models, RC robots/arms, UAV drones, IoT, smart homes, and industrial and agricultural equipment.
maybe this servo does not like the GRBL update rate, being a digital it might be 'smart' enough to reject updates that are not at the timing it expects
From what I can tell, it seems like a signal issue. I wasn't aware there were different control methods for servos. Is a servo driver like the PCA9685PW a potential solution? If so, can this be easily implemented with a Blackbox 4x.
The older 4X runs on an 8 bit microcontroller so was limited to 61Hz servo signal (prescaler 1/1024), which is fine for most, but some servos might be extra uptight: grbl-servo/grbl/config.h at eggbot · cprezzi/grbl-servo The newer X32 has scope to have more configurable parameters (See FootNote 13 on GitHub - grblHAL/drivers: Driver overview near bottom of page) - can be set to 50hz which is slightly slower and might be what that one needs (untested of course)
