For a light camera on a Raspberry Pi, use two positional servos with a PCA9685 I2C PWM board. It is the quickest route to bounded pan and tilt motion because the board handles servo timing while the Pi runs Python, vision, networking, or camera logic. For a heavier camera, continuous pan, lower servo deadband, gearing, or homing sensors, use geared NEMA 17 bipolar steppers with A4988, DRV8825, or TMC2208 drivers and a separate motor supply. There is no universal best motor: payload, axis offset, range, noise, speed, backlash, power and feedback requirements determine the right architecture.
Choose the motion architecture before buying motors
A pan-tilt head has two different mechanical problems. The pan axis rotates the assembly around a vertical axis; the tilt axis must hold the camera, lens and accessories against gravity. Tilt therefore usually needs the larger static torque margin, especially when the camera’s center of mass sits forward of the bearing or motor shaft.
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Measure the complete moving load, not only the camera body. Include the lens, microphone, cable drag and any bracket that moves with the tilt frame. A useful first estimate for static tilt torque is torque = mass × 9.81 × perpendicular distance. Add a safety margin for acceleration, friction and imbalance rather than selecting a motor whose rated torque merely equals the calculated holding torque.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minute| Requirement | Two positional servos | Geared NEMA 17 steppers |
|---|---|---|
| Best fit | Light camera, quick build, bounded travel | Heavier head, gearing, continuous pan or repeatable indexed motion |
| Controller interface | PCA9685 PWM over I2C, or direct timed PWM pins | STEP, DIR and usually ENABLE signals |
| Position behavior | Internal servo feedback; travel is mechanically bounded | Open-loop unless sensors are added; gearing can provide large reduction |
| Typical project evidence | SunFounder documents 0–180° pan and 0–90° tilt | Open-source builds use NEMA 17 motors, gears, bearings and stepper drivers |
| Main risks | Deadband, backlash, stall current and insufficient tilt torque | Missed steps, driver heating, current misadjustment and cable-wrap limits |
Servos are not automatically less capable, and steppers are not automatically more accurate. A balanced load on a correctly sized servo can outperform an underpowered stepper, while a geared stepper with homing can deliver more useful repeatability than a cheap plastic-geared servo.
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Architecture 1: two positional servos with a PCA9685
Why this is the simplest Raspberry Pi design
SunFounder describes a two-axis Pan-Tilt HAT in which “The free turning of the Pan-Tilt is mainly realized by two servos.” Its documented motion envelope is 0–180° left-to-right for pan and 0–90° up-to-down for tilt. Treat those figures as the mechanism’s stated range, not a promise that every servo or bracket can safely reach both endpoints. The same documentation describes PWM and I2C interfaces and a 5-megapixel camera example.
A PCA9685 board lets a Raspberry Pi send servo commands over I2C while the board generates the PWM timing. ArduCAM’s PCA9685 project identifies this arrangement for Raspberry Pi pan-tilt cameras and requires Raspberry Pi I2C support. The Pi can then spend its CPU time on image capture, tracking, web control or a vision model instead of maintaining precise pulse timing.
Servo signal and timing settings
MathWorks documents a PCA9685-based Pan Tilt Hat block with 50 Hz PWM, a 0.1-second sample time and 500–2500 microsecond pulse limits for both axes. Those values are useful starting points, not universal servo specifications. Check the data sheet for the exact servo: some units use a narrower safe pulse range, a different center point or a different supply voltage. Command the mechanical center first, then increase travel gradually while watching for binding.
How to size the two servos
- Size the tilt servo from the worst-case torque with the lens fully extended and the camera offset from the tilt axis.
- Check stall current and supply voltage separately from torque. A servo that has enough torque but causes the supply to sag can reset the Pi or chatter.
- Prefer metal gears only when their rated torque, voltage and physical dimensions fit the design; metal gears alone do not remove backlash.
- Balance the camera around the tilt shaft. A balanced camera requires much less continuous holding torque and runs more smoothly.
- Provide hard mechanical limits even when the servo has an internal position controller. A software command can still drive a bracket into a stop.
Raspberry Pi and PCA9685 wiring sequence
- Mount the pan and tilt servos so the tilt shaft supports the moving camera frame through bearings or a rigid bracket rather than loading a small servo output spline as the only bearing.
- Connect the PCA9685 logic supply, ground and I2C clock/data lines to the Pi according to the board’s voltage requirements. Connect servo power to a supply capable of the combined stall current; do not assume the Pi’s 5 V rail can provide it.
- Enable I2C in the Pi’s configuration utility, then verify that the board appears on the I2C bus before attaching a camera or writing motion code.
- Connect each servo signal to a separate PCA9685 output and keep a common ground between the logic and servo supply.
- Run a calibration program that sends the center pulse, attach the horns at the camera’s mechanical center, and record the safe minimum and maximum pulse values.
- Move in small increments, checking both axes for cable tension, bracket interference and vibration before enabling automated tracking.
An Arduino can also generate servo signals directly. A Raspberry Pi Official Magazine build connects pan and tilt signal wires to Arduino digital pins 9 and 8, with the Arduino moving the camera and triggering photographs. Direct pins are suitable for a very small two-servo head; a PCA9685 becomes more useful when you want PWM timing offloaded, cleaner wiring or additional outputs.
Architecture 2: geared NEMA 17 steppers
When a stepper is the better actuator
Choose a geared NEMA 17 when the head must carry more mass, pan continuously, use a substantial reduction, or move in repeatable commanded increments without servo deadband. The motor itself does not know absolute position. After power loss or a missed step, the controller’s position estimate can be wrong until the mechanism is re-homed.
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An open-source Arduino Gimbal reference uses two NEMA17-13 stepper motors, A4988 modules, a joystick, a 12 V 2 A motor supply and an Arduino Mega. Its herringbone gears and separate radial and thrust bearings illustrate the mechanical support a camera head needs. This is a concrete design reference, not a universal NEMA 17 rating or a guarantee that every 12 V 2 A supply is adequate.
Driver choices
| Driver | What the documented examples support | Choose it when |
|---|---|---|
| A4988 | Simple, inexpensive STEP/DIR module; used in the Arduino Gimbal reference | You want a conventional, widely documented driver and can tolerate more audible switching noise |
| DRV8825 | Listed by DCC-EX as an alternative two-wire NEMA 17 driver | You need a compatible STEP/DIR option and will set its current limit and cooling for the exact board |
| TMC2208 | Listed by DCC-EX; used in a 3D-printed pan-tilt project with 16× microstepping | Quiet, smooth motion is important and the module’s configuration and current range suit the motor |
DCC-EX specifically warns that inexpensive ULN2003/28BYJ-48 combinations can have gear slop and inconsistent quality, and recommends a NEMA 17 with a two-wire stepper driver such as the A4988, DRV8825 or TMC2208 instead. The recommendation is about avoiding that small geared motor combination’s play; it does not mean every NEMA 17 has the same torque, current or dimensions.
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A separate 3D-printed Arduino Nano pan-tilt mount documents NEMA 17 motors with TMC2208 drivers, 16× microstepping, Hall-effect homing sensors and either 12 V input or a three-cell LiPo battery. In that particular mechanical assembly, reported geared precision was approximately 0.0133° on pan and 0.0369° on tilt, the tested payload was just over 1 kg, and selected settings produced approximately 20°/s pan and 15°/s tilt. The project also reports shaking during rapid direction changes with its heaviest tested camera. These are project-specific results, not guaranteed ratings for every NEMA 17, TMC2208 or printed bracket.
Stepper wiring and current setup
A4988-style control signals
Connect the controller’s STEP, DIR and ENABLE outputs to the driver’s corresponding inputs. DCC-EX’s A4988 guidance requires RESET and SLEEP to be tied correctly so the module remains enabled; follow the exact pin arrangement on the driver revision you bought. Connect the motor supply and logic ground as specified by the board, and share a common ground with the Arduino.
- With power removed, identify one motor coil pair with a meter or the motor documentation and connect each pair to one driver output pair. Never insert or remove a motor while the driver is powered.
- Place a 47 µF electrolytic capacitor close to the driver’s motor-power input, observing polarity. DCC-EX recommends this local decoupling; also follow the driver’s own voltage and capacitance requirements.
- Set the driver’s current limit before sustained motion. Use the exact module’s reference method and the motor’s rated phase current; do not infer a safe setting from the nominal motor voltage.
- Start with conservative acceleration and low speed. Increase them only after checking missed steps, driver temperature, motor temperature and supply voltage under simultaneous two-axis motion.
- Add a fuse or other suitable protection, strain relief and an emergency power-disconnect appropriate to the supply you use.
Microstepping, gearing and accuracy
Microstepping divides each commanded full step into smaller electrical increments and can reduce vibration, but it does not by itself guarantee absolute angular accuracy. Gear tooth geometry, shaft compliance, bearing play, current regulation and load torque still determine the camera’s actual position. A reduction can increase usable torque and resolution while reducing top speed. Use backlash-minimized gears or belts where repeatability matters, and preload or support radial and thrust loads with proper bearings.
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Controller options by project priorities
| Controller arrangement | Use it for | Important implementation points |
|---|---|---|
| Raspberry Pi + PCA9685 | Two standard positional servos, Linux vision, networking and Python control | Enable I2C, provide a separate servo supply sized for stall current, calibrate pulse limits and share ground |
| Arduino Nano or Mega + A4988, DRV8825 or TMC2208 | Deterministic step pulses, joystick input, limit switches and Hall sensors | Use a separate motor supply, common ground, correct current limit, local 47 µF decoupling and suitable cooling |
| Arduino direct servo pins | A very small two-servo head with minimal electronics | Keep pulse generation and camera-control timing coordinated; move to a PCA9685 when wiring or channel needs grow |
A hybrid arrangement is also practical: an Arduino can handle real-time step pulses and homing while the Pi sends high-level targets over a serial link. Keep the safety layer on the real-time controller so a lost network packet does not leave a motor driving indefinitely.
Mechanical design determines whether electronics succeed
Balance the tilt axis
Place the tilt axis near the camera’s center of mass. Every millimeter of forward offset increases the holding torque and makes a servo buzz or a stepper lose steps. If the lens or microphone makes the camera front-heavy, use a counterweight or adjustable mounting plate before increasing motor size.
Support loads with bearings
Use separate radial and thrust bearings when the frame places side or axial loads on an axis. The Arduino Gimbal reference explicitly uses herringbone gears plus separate radial and thrust bearings. A motor shaft and its gear are not a substitute for a bearing designed to carry the camera assembly.
Plan range and cable routing
Servos provide bounded positional travel; the documented Pan-Tilt HAT example lists 0–180° pan and 0–90° tilt. A stepper can support continuous pan only if the frame, slip ring or cable loop permits it. Add software limits, physical stops and a cable-routing test before allowing a full rotation. A homing sensor cannot prevent a cable from wrapping if the controller has no wrap policy.
Homing, feedback and recovery
Positional servos contain their own feedback loop, but they still need mechanical limits and a known calibration relationship between pulse width and camera angle. Steppers normally operate open-loop. Add Hall-effect sensors, optical switches or robust end stops to establish a reference at startup, then store position only relative to that home.
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Home both axes at a low speed after power-up, back away from the sensor, and approach again slowly if repeatability matters. If a stepper stalls, stop motion, re-home and discard the old coordinate estimate. Do not silently continue from a presumed position. For a servo, detect sustained error through the camera result or an external sensor if the application cannot tolerate a stalled axis.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Noise, smoothness and speed trade-offs
- Mechanical balance: The first remedy for chatter is reducing gravitational load and gear backlash, not simply raising current.
- Acceleration: Rapid direction changes can shake a camera; the documented TMC2208 project saw this with its heaviest tested camera.
- Driver selection: A4988 is straightforward and inexpensive. TMC2208 appears in a quiet, microstepped camera-mount example, but quiet operation does not prove absolute accuracy.
- Control rate: MathWorks’ documented servo example uses a 0.1-second sample time. Faster command updates are not useful if the mechanics cannot settle between moves.
- Resonance: Change acceleration, microstep setting, gear ratio or mounting stiffness when a narrow speed band causes vibration.
Power and thermal checks
Size the supply for simultaneous motor or servo current, startup surges and wiring losses. A nominal motor voltage is not a supply-capacity specification. Check the driver’s thermal behavior with both axes moving, provide airflow or a heatsink when the module requires it, and keep high-current motor wiring away from camera and I2C signal wiring.
For the stepper path, the 12 V 2 A supply in the Arduino Gimbal reference is a project component, not a recommendation for every build. The required capacity depends on the exact motor phase current, driver regulation, duty cycle, acceleration and whether both axes move at once. For servos, calculate from worst-case stall current and verify that voltage remains within the servo and PCA9685 board limits.
A practical build-and-test plan
- Define the load: Weigh the complete moving assembly and measure the center-of-mass offset on pan and tilt.
- Choose travel: Decide whether you need bounded angles or continuous pan, then design cable routing and hard stops around that decision.
- Choose the actuator: Select servos for a light, simple head; select geared NEMA 17 steppers when mass, gearing, continuous motion or homing takes priority.
- Choose the controller: Use PCA9685 over I2C with a Pi for servo timing, or an Arduino with STEP/DIR drivers for deterministic step pulses and sensors.
- Build the mechanics: Balance the camera, support radial and thrust loads with bearings, and verify that gears or belts do not bind through the full range.
- Wire safely: Separate logic and motor supplies as required, join grounds, add the recommended 47 µF capacitor near an A4988 motor input, and set current limits before motion.
- Calibrate: Center servos or home steppers, establish software limits and record the usable angle rather than assuming the theoretical range.
- Test progressively: Move one axis unloaded, then loaded, then both axes together. Test slow motion, acceleration, emergency stop, power cycling and recovery from a deliberately triggered limit.
Troubleshooting common failures
The servo chatters or the Pi resets
Check stall-current capacity, voltage sag, common ground and mechanical binding. Move servo power off the Pi’s supply path when the current demand is high, and shorten or reinforce power wiring. Recalibrate pulse limits so the servo is not repeatedly pressing a hard stop.
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Confirm the two coil pairs, driver enable state, RESET/SLEEP wiring and current-limit setting. A disconnected or incorrectly paired coil can produce vibration without useful rotation. Power down before changing motor wiring.
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The camera slowly loses its angle
For a stepper, reduce acceleration and load, check for gear slip, increase torque margin and add homing sensors. For a servo, inspect spline or gear backlash, bracket flex and whether the commanded pulse exceeds the mechanism’s safe range.
Motion is noisy or the image shakes
Balance the camera, stiffen the bracket, support the shafts with bearings and use gentler acceleration. Microstepping may reduce vibration, but it cannot correct a loose gear mesh or a flexible mount.
The head stops at an unexpected position after reboot
A stepper has no absolute position memory. Home it at startup and treat the pre-home coordinate as unknown. Add end stops or Hall sensors before relying on unattended operation.
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Bottom-line selection
Build the two-servo PCA9685 version when the camera is light, pan and tilt can remain within bounded angles, and you value the shortest path from Raspberry Pi software to working motion. Build a geared NEMA 17 system with an A4988, DRV8825 or TMC2208 when the head is heavier, needs continuous pan, requires gearing or benefits from explicit homing and deterministic step control. In either case, torque margin, balance, bearings, current limiting, decoupling and mechanical limits matter more than the name printed on the controller board.
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