Robotic Arm Joint Sequencing
Sequence several joints while respecting travel, load, collision and power limits.
Learning objective
Sequence several joints while respecting travel, load, collision and power limits.
Components and tools
- Development board
- Current-limited low-voltage supply
- Digital multimeter
- Oscilloscope or logic analyser
- Emergency power disconnect
Safety before motion
- Keep hands outside the arm envelope while powered.nUse mechanical stops/limits and current protection.nNever rely only on software to prevent collision.
Practical procedure
- Remove payload and set conservative joint limits.nTest one joint at a time.nDefine a safe home pose.nInterpolate slow coordinated motion.nAdd limit/current fault handling before payload tests.
Measurement checkpoints
| Checkpoint | Expected | Instrument | Safety limit |
|---|---|---|---|
| Home | All joints reach safe pose | Observation | No hard-stop contactnCurrent |
Troubleshooting
| Symptom | Check | Corrective action |
|---|---|---|
| Joint buzzes | Overload or hard stop | Remove load/reduce travelnPosition drifts |
Engineering sizing tools
Calculate before powering
Mandatory pre-start gate
Machine safety checklist
The simulated enable button remains locked until every item is confirmed.