ESP32-C3 Dual-Servo Controller Design

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Blocked now: the project has no available ACUs, so I can’t continue modifying or verifying the design.
What I completed:
  • Renamed project to ESP32-C3 Dual Servo Controller and updated the description.
  • Selected LMR51625YDDCR for the 9–32 V to 5 V buck rail.
  • Switched the 3.3 V rail to TLV76701DRVR per your instruction.
  • Added and partially wired:
    • ESP32-C3FH4 bare IC
    • LMR51625 buck regulator and feedback/passives
    • TLV76701 3.3 V LDO and feedback/passives
    • 9–32 V input connector
    • Two 3-pin servo connectors
    • ESP32-C3 boot/reset support
    • UART programming header
    • Decoupling capacitors and power nets
Known remaining work:
  • Add/verify the required 40 MHz ESP32-C3 crystal circuit.
  • Add/verify RF antenna/matching network for the bare ESP32-C3 IC.
  • Finish ERC cleanup and verify all remaining floating pins.
  • Correct any generic passive package warnings.
  • Run full review until violations are resolved or explicitly justified.
The schematic is not complete yet; the bare ESP32-C3 clock/RF portions still need to be finished once ACUs are available.
Add crystal circuit
Add RF network
Run ERC/DRC
Check LDO feedback
Sign up to send
U1
U2 SW - C4 P2
U2 FB - R1 P2
U1 GPIO3 - J2 Data
R6 P2 - U1 GPIO2
J3 2 - U1 U0TXD
L1 P2 - R1 P1
SW2 1 - U1 GPIO9
C10 P1 - C11 P1
U2 FB - R1 P2
U2 SW - C4 P2
U1 VDDA - U1 VDDA
U3 FB/SNS - R3 P2
U2 SW - C4 P2
L1 P2 - R1 P1
U1 GPIO10 - Servo1 Data
J3 3 - U1 U0RXD
L1 P2 - R1 P1
U1 VDD3P3_RTC - U1 VDD3P3_CPU
J1 1 - U2 VIN
C10 P1 - C11 P1
J1 1 - U2 VIN
L1 P2 - R1 P1
U1 GPIO10 - Servo1 Data
U1 VDD3P3_RTC - U1 VDD3P3_CPU
U1 GPIO3 - J2 Data
R7 P2 - U1 GPIO9
R7 P2 - U1 GPIO9
R5 P2 - U1 CHIP_EN
U2 EN - C1 P1
R8 P2 - U1 GPIO8
U1 VDDA - U1 VDDA
L1 P2 - R1 P1
C10 P1 - C11 P1
C4
Capacitance
100nF
GND
J2
U3 EP - R2 P2
C10 P2 - C11 P2
R1
Resistance
53.6kΩ
GND
GND
GND
L1
Inductance
4.7µH
GND
GND
Servo1
J1
U2
U3
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
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    1.5M
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    1.5M
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ESP32-C3 Dual Servo Controller

ESP32-C3 Dual Servo Controller thumbnail
ESP32-C3 based controller for two 5 V, 150 mA servos from a 9–32 V DC input. Uses an LMR51625 buck regulator for the 5 V rail and derives 3.3 V logic power for the ESP32-C3.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor

Qty 1

Arrow

$1.91–$1.95

Digi-Key

$1.30

HQonline

$2.23

LCSC

$4.92

Mouser

$5.98

TME

$0.26

Verical

$0.17–$0.56

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