Senior Member
Joined: 02/09/2020
Location: United StatesPosts: 220
| Posted: 03:24am 21 Sep 2020 |
larny - Sorry about not getting back to you sooner! I didn't turn notifications on for the post (or your response) :-(
Typically these servos need to be "calibrated". You set the PWM duty cycle to 50%, and adjust the trimpot so that the servo doesn't rotate either way. Lower duty cycles make the servo turn in one direction / higher duty cycles make the servo turn in the other direction:
PWM Duty Cycle Servo Speed
============== =================
0 (0%) Full speed in one direction (call it "Forward")
31 (~12%) Three quarter speed Forward
63 (25%) Half speed Forward
95 (~38%) Quarter speed Forward
127 (50%) Stopped (at least, after calibration)
159 (~62%) Quarter speed in the other direction (call it "Reverse")
191 (75%) Half speed Reverse
223 (~87%) Three quarter speed Reverse
255 (100%) Full speed Reverse
============== =================
0 (0%) Full speed in one direction (call it "Forward")
31 (~12%) Three quarter speed Forward
63 (25%) Half speed Forward
95 (~38%) Quarter speed Forward
127 (50%) Stopped (at least, after calibration)
159 (~62%) Quarter speed in the other direction (call it "Reverse")
191 (75%) Half speed Reverse
223 (~87%) Three quarter speed Reverse
255 (100%) Full speed Reverse
Your conclusion regarding driving the wheels was correct!