DC Motor + Stepper FeatherWing Add-on For All Feather Boards — pinout, I²C address, specs

Pinout

38 pads, as the vendor numbers them.

#	Name	Function	Signals
1	WAKE	Header pad where the Feather's WAKE pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
2	D1	Header pad where the Feather's D1 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
3	D0	Header pad where the Feather's D0 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
4	MISO	Header pad where the Feather's MISO pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
5	MOSI	Header pad where the Feather's MOSI pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
6	SCK	Header pad where the Feather's SCK pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
7	A5	Header pad where the Feather's A5 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
8	A4	Header pad where the Feather's A4 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
9	A3	Header pad where the Feather's A3 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
10	A2	Header pad where the Feather's A2 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
11	A1	Header pad where the Feather's A1 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
12	A0	Header pad where the Feather's A0 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
13	GND	3.3 V logic ground, taken from the Feather's GND pin	ground
14	AREF	Header pad where the Feather's AREF pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
15	3V	Logic supply for the PCA9685 and the H-bridge logic, from the Feather's 3.3 V regulator	3.3 V supply, input
16	RST	Tied to the on-board reset button (fab file SW1) - pressing it pulls the Feather's RESET low	reset, input
17	BAT	Header pad where the Feather's BAT pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
18	EN	Header pad where the Feather's EN pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
19	USB	Header pad where the Feather's USB pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
20	D13	Header pad where the Feather's D13 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
21	D12	Header pad where the Feather's D12 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
22	D11	Header pad where the Feather's D11 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
23	D10	Header pad where the Feather's D10 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
24	D9	Header pad where the Feather's D9 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
25	D6	Header pad where the Feather's D6 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
26	D5	Header pad where the Feather's D5 pin sits; nothing on this wing connects to it, so the pad is mechanical only	Feather header pass-through, not connected on this board
27	SCL	I2C clock, 10 kOhm pull-up to 3.3 V on the board	I2C SCL, input
28	SDA	I2C data, 10 kOhm pull-up to 3.3 V on the board	I2C SDA, bidirectional
29	M1A	Motor terminal X1 pad 1 (one screw of the M1 block), fab net N$6 into IC1 pins 5/6	motor output, H-bridge A
30	M1B	Motor terminal X1 pad 2 (the other screw of M1), fab net N$4 into IC1 pins 1/2	motor output, H-bridge A
31	M2A	Motor terminal X2 pad 1, fab net N$9 into IC1 pins 11/12	motor output, H-bridge B
32	M2B	Motor terminal X2 pad 2, fab net N$7 into IC1 pins 7/8	motor output, H-bridge B
33	M3A	Motor terminal X4 pad 1, fab net N$14 into IC3 pins 5/6	motor output, H-bridge C
34	M3B	Motor terminal X4 pad 2, fab net N$12 into IC3 pins 1/2	motor output, H-bridge C
35	M4A	Motor terminal X6 pad 1, fab net N$17 into IC3 pins 11/12	motor output, H-bridge D
36	M4B	Motor terminal X6 pad 2, fab net N$15 into IC3 pins 7/8	motor output, H-bridge D
37	MOTOR GND	Motor power terminal (fab file MPOWER) pad 1, on the GND net; silk prints a minus sign beside it	motor supply return, ground
38	MOTOR V+	Motor power terminal pad 2, through the reverse-polarity P-FET (Q1) onto the fab net named +12V; silk prints "5-12VDC" and a plus sign	motor supply, power input

Buses

Bus	Signals	Pins	Voltage	Note
I2C ×1	SDA, SCL	SDA, SCL

I²C / bus addresses

Address	Bus	Device	Note
0x60	I2C	PCA9685 16-channel 12-bit PWM driver	7-bit default with all five jumpers (A0-A4, on the bottom, fab file A0/A1/A2/A3/A4) open. Open jumpers add binary weights to 0x60, giving 0x60-0x7F and 32 stackable wings. The fixed all-call address is 0x70, which is exactly what bridging A4 (bit 4) produces - so A4 has to stay open unless you want this wing answering all-call.

Power

Input	Two supplies, deliberately separate: 3.3 V logic from the Feather through the header, and 5-12 V DC for the motors on the 2-pin terminal block (fab file MPOWER, silk "5-12VDC")
Input range	Motor rail 5-12 V DC per Adafruit's guide and silkscreen; the TB6612 bridges themselves are rated 4.5-13.5 V DC

Adafruit is explicit that the motor supply does not power the Feather and that running motors from the Feather's LiPo is not advised - the two rails are separate on purpose. The motor input is reverse-polarity protected by a P-channel MOSFET (fab file Q1, AON7401) rather than a diode, so there is no deliberate drop in the motor rail. Adafruit does not publish a quiescent current for the wing and publishes no dimensions, so neither is recorded here.

Notes

Pin numbers 1-28 are the fab file's own pad numbers: 1-16 = JP2 (the 1x16 header, WAKE at pad 1 through RESET at pad 16), 17-28 = JP1 (the 1x12 header, BAT at pad 1 through SDA at pad 12). Only six of those 28 pads carry a wing circuit (GND, 3V, RST, SCL, SDA, plus BAT and USB which reach only the schematic's FeatherWing symbol); every other header pad is a bare through-hole that the Feather's pin passes through, which is why the pads are still listed - the land pattern has them, and a footprint that drops them will not seat. Because the wing only touches SDA/SCL, it does not matter which Feather is underneath. Motors 1 and 2 are IC1's two bridges and motors 3 and 4 are IC3's; each bridge is a TB6612 pair rated 1.2 A continuous and 4.5-13.5 V by Adafruit, with thermal shutdown and kickback diodes, and Adafruit's own note says to derate below 1.2 A. Every output is driven by the PCA9685, so speed resolution is 12-bit (about 0.02%). For steppers, the M1+M2 pair is one motor (coils 1 and 2) and M3+M4 the other; wire order matters for steppers and does not for DC motors. Motors come up disabled at power-on. Two cautions from the guide: the guide and the silkscreen say 5-12 V while the bridge is rated to 13.5 V, and the guide's ordering advice for unipolar steppers is to tie the centre taps to the motor-supply ground terminal - which is the same GND net the logic side uses, so a unipolar motor's centre tap lands on logic ground. Adafruit publishes no dimensions for this wing; the fab file's board outline measures 50.80 x 22.86 mm, the same outline as the 8-channel PWM wing (product 2928), whose published dimensions are 50.8 x 22.9 mm - which is why that measured figure is quoted with the fab file as its source rather than the product page. Adafruit's own note: the wing has no servo headers (they would not fit), so use the 8-channel PWM/Servo FeatherWing for servos.

Provenance

Every figure on this page was read from the 3 sources below and last checked on Oct 19, 2026.