Logical pinout · physical placement not verified

USB Type C
USB-C power input connector; Adafruit Learn says it works with computer or power supply to get 5V and up to 1A.
Type · PowerVoltage · 5V USB input, up to 1A per Adafruit Learn
VIN
Solar panel or DC power input to the bq25185 charger.
Type · PowerVoltage · 5~18V input per Adafruit Learn
VU
Power input from the USB connector, exposed on the board.
Type · PowerVoltage · USB input rail per Adafruit Learn
G
Common ground connection.
Type · GroundVoltage · 0V / common ground
BAT
Battery connector and BAT pad for a single-cell LiPo/LiIon battery output or battery voltage monitoring.
Type · PowerVoltage · 3.7V nominal / 4.2V max battery chemistry per Adafruit Learn
4.5V
Terminal-block load output labelled 4.5V on the board silk; regulated 4.5V max load output.
Type · PowerVoltage · regulated 4.5V max load output per Adafruit Learn
-
Terminal-block common ground connection.
Type · GroundVoltage · 0V / common ground
3V
Regulated 3.3V output from the separate buck converter, also available on bottom of board as 3V.
Type · PowerVoltage · 3.3V output, 1A max load per Adafruit Learn
D+
USB positive data line exposed by the board.
Type · USBVoltage · USB data line
D-
USB negative data line exposed by the board.
Type · USBVoltage · USB data line
EN
Enable pad for the 3.3V buck output; bringing EN low disables the 3.3V output.
Type · ControlVoltage · logic/control enable for 3.3V buck output per Adafruit Learn

Pin	Type	Function	Voltage
USB Type C	Power	USB-C power input connector; Adafruit Learn says it works with computer or power supply to get 5V and up to 1A.	5V USB input, up to 1A per Adafruit Learn
VIN	Power	Solar panel or DC power input to the bq25185 charger.	5~18V input per Adafruit Learn
VU	Power	Power input from the USB connector, exposed on the board.	USB input rail per Adafruit Learn
G	Ground	Common ground connection.	0V / common ground
BAT	Power	Battery connector and BAT pad for a single-cell LiPo/LiIon battery output or battery voltage monitoring.	3.7V nominal / 4.2V max battery chemistry per Adafruit Learn
4.5V	Power	Terminal-block load output labelled 4.5V on the board silk; regulated 4.5V max load output.	regulated 4.5V max load output per Adafruit Learn
-	Ground	Terminal-block common ground connection.	0V / common ground
3V	Power	Regulated 3.3V output from the separate buck converter, also available on bottom of board as 3V.	3.3V output, 1A max load per Adafruit Learn
D+	USB	USB positive data line exposed by the board.	USB data line
D-	USB	USB negative data line exposed by the board.	USB data line
EN	Control	Enable pad for the 3.3V buck output; bringing EN low disables the 3.3V output.	logic/control enable for 3.3V buck output per Adafruit Learn

Logical pinout · physical placement not verified

Pin details

11 connections

USB Type C
USB-C power input connector; Adafruit Learn says it works with computer or power supply to get 5V and up to 1A.
PowerVoltage · 5V USB input, up to 1A per Adafruit Learn
VIN
Solar panel or DC power input to the bq25185 charger.
PowerVoltage · 5~18V input per Adafruit Learn
VU
Power input from the USB connector, exposed on the board.
PowerVoltage · USB input rail per Adafruit Learn
G
Common ground connection.
GroundVoltage · 0V / common ground
BAT
Battery connector and BAT pad for a single-cell LiPo/LiIon battery output or battery voltage monitoring.
PowerVoltage · 3.7V nominal / 4.2V max battery chemistry per Adafruit Learn
4.5V
Terminal-block load output labelled 4.5V on the board silk; regulated 4.5V max load output.
PowerVoltage · regulated 4.5V max load output per Adafruit Learn
-
Terminal-block common ground connection.
GroundVoltage · 0V / common ground
3V
Regulated 3.3V output from the separate buck converter, also available on bottom of board as 3V.
PowerVoltage · 3.3V output, 1A max load per Adafruit Learn
D+
USB positive data line exposed by the board.
USBVoltage · USB data line
D-
USB negative data line exposed by the board.
USBVoltage · USB data line
EN
Enable pad for the 3.3V buck output; bringing EN low disables the 3.3V output.
ControlVoltage · logic/control enable for 3.3V buck output per Adafruit Learn

Start wiring

Wide input · Module

Verify supply voltage and logic levels before powering up.

Module pins: USB Type C, VIN, VU, BAT, 4.5V, 3V, G, -. Schematik maps them to your board in the app.

Solar

27 other options

Solar panels from 1.5V 250mA flexible film to 18V 10W polysilicon, MPPT solar power managers (DFRobot 5V and 9V/12V/18V, Waveshare 6V–24V), bq25185 charger boards and LTC3588 energy-harvesting breakouts.

View all 27

Related groups

4 groups

Batteries

9V alkaline cells, CR2032 coin cells, 3.7V LiPo packs (1000–1200mAh), 7.4V 2S LiPo, 18650 Li-ion holders (1–6 cells), AA/AAA holders in every configuration, and snap leads with barrel adapters.

Power · Batteries · 104 parts

Charging

Single-cell LiPo chargers (TP4056, MicroUSB/Type-C modules), charger/booster combos (PowerBoost 500/1000, Lipo Rider Plus 5V/2.4A), I2C fuel gauges (MAX17048, LC709203F) and Qi wireless charging coils.

Power · Chargers & fuel gauges · 47 parts

Power supplies

Wall adapters (5V–24V), adjustable and fixed buck/boost/buck-boost converters (MT3608, LM2596-class), USB-C PD triggers (HUSB238), breadboard supplies, DIN-rail units and passive barrel-jack adapters.

Power · Supplies & regulators · 147 parts

3D printing

DFRobot 1.75 mm PLA in 1 kg spools makes up the bulk of the group, in over 15 colors. Specialty options include PVA in both diameters, NinjaFlex flexible filament, Proto-Pasta conductive PLA, and wood-fill. OverLord printer spares and OverLord printers round out the hardware side.

Tools & prototyping · 3D printing · 53 parts

Pinout