TECHNICAL SUPPORT
Published 2026-03-31
Think of your Pi as the brain of your robot, but when you need to the () , the Pi's built-in PWM just aren't . The is like a for up to 16 , so your Pi stays on tasks like . to data, the microservomotor is to hit $3.5 by 2033, at 6.8% . This guide gives you - code, , and power to build multi-servothat won't or crash.
The is an I2C- PWM chip from NXP that 16 of 12-bit PWM . your Pi's - PWM, this chip has its own 25 MHz of the Pi's CPU. You send over I2C, and the all - pulse Linux . This need a 50 Hz (20 ms ) with pulse 0.5 ms to 2.5 ms to 0-180 . Even a 50- error from CPUservothat ruins.
PWM on Pi CPU when . 8 PWM eats 30-40% of a Pi 3B+ CPU time, for or web . The , using just 2 of CPU time per of count. You also get true with 4096 steps per cycle PWM's 100-step . For pan-tilt or with 18 , this your robot walks or .
micro like the 20KG and than . For most , look for 9 kg·cm and metal gears. work for basic tasks but draw even when idle, while pulse only when . Check stall a SG90 draws 500 mA, but an pulls 2.5A when stuck. your power needs with 30% 10 × 2A × 1.3 = 26A for high- . Never trust cheap their PWM by ±200, .
I2C on your Pi first usingsudo raspi-. Pi pin 1 (3.3V) to VCC, pin 3 (GPIO2/SDA) to SDA, pin 5 (GPIO3/SCL) to SCL, and any GND pin to GND. For servo power, a 5V 10A to V+ and GND : you must share Pi and the . the withsudo pip -. Here's - code for two :
from time # at I2C 0x40 dev = (0x40, =1) dev.(50) # servo = 150 # 0 = 600 # 180 def (,angle): pulse = int( + (angle / 180.0) * ( - )) dev.(, pulse) (0, 90) # servo on 0 (1, 45) # 45 on 1add a 1000 µF the V+ and GND on your board. This bulk when start , that cause drift. Set your PWM to 50 Hz for , but like work at 60-100 Hz for . soft-start in code all to on the .
The one is from the Pi's 5V pin. A Pi 4's 5V rail only 2.5A total for maybe 3 SG90 SD card and . Using the PWM have no path, loss. error is I2C 0x40 if you chain . on A0-A5 pins to set like 0x41, 0x42 . , never run above 100 Hz you'll burn out their hours.
The-y 1is your first tool you see 0x40 in the grid. Use an or logic to PWM pulse a $20 clone works . For power , a USB power meter your servo and shows real-time draw. Thea mode rundev.()to your . Keep a handy to check V+ under load some cheap 5V drop to 4.2V when 5A, to lose .
The push means servo isn't it's the of. Start with two on a pan-tilt mount, your power, then scale to 16. What multi-servo are you right now drop a below with your servo count and power setup, and I'll help you debug your
Update Time：2026-03-31
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