M5Stack Timer Power Unit with OLED Display (INA3221)
Product Link
Description
The TimerPWR Unit is a timed power supply unit whose main functions are "charging & discharging + timed switching + screen display + boost output." It features an internal STM32 microcontroller that implements RTC and overall control, allowing users to set automatic power on/off times as needed. It is powered via the Type-C interface and can be connected to an external rechargeable battery via a 1.25-2P interface. The unit includes a built-in battery charging circuit supporting a charging current of 330mA. It also features an integrated DCDC boost circuit that provides a 5V/800mA (1400mA @ 1C battery power) power output to external devices via the Grove port. Additionally, the INA3221 sensor is built-in, allowing real-time monitoring of power input and output current and voltage. The unit is equipped with a 0.66-inch OLED display and two side buttons for user interaction, making it easy to view real-time system status and modify settings. Users can set parameters such as power on/off using the side buttons or via the I2C bus through the Grove interface with I2C commands. This product is suitable for smart homes, industrial automation, and timed control devices.
Features
RTC cycle timing control
Battery power supply
Built-in DCDC boost circuit
Current/voltage monitoring
OLED display
Grove interface
Button-controlled power on/off mode
Applications
Timed control devices
Portable electronic devices
Powering sensor nodes
Specifications
MCU
STM32G031G8U6
Input Voltage
Supports 5V DC input (via Type-C interface)
Output Voltage
Built-in DCDC boost circuit, output 5V for external devices
Battery Power Supply
3.7V Polymer Lithium Battery
Display Screen
0.66-inch OLED display, resolution 64x48, SPI communication
Interfaces
Type-C interface: for battery charging (cannot power Grove port directly) Grove interface: for external sensors and modules, supports communication and power output Battery interface: 1.25mm@2P
I2C Communication Address
0x56
Current Sensor
INA3221
Charging Current
DC5V@330mA
Charging Chip
LGS4056H
Charging Temperature
55°C
Grove Port Max Current Output
Dependent on battery capacity and discharge ability, e.g.: 1400mAh@1C 3.7V: DC4.96V@800mA 500mAh@1C 3.7V: DC4.97V@700mA 110mAh@1C 3.7V: DC5.03V@400mA
Standby Current
DC4.2V@36.67uA
Operating Temperature
0-40°C
Product Dimensions
40*24*11mm
Package Dimensions
136*92*14mm
Product Weight
7.6g
Package Weight
12.9g
Related Links
Schematic
PinMap
PORT A Interface
Core (Basic)
G22
G21
5V
GND
Core2
G33
G32
5V
GND
CoreS3
G1
G2
5V
GND
Atom Lite / Atom Matrix
G21
G25
5V
GND
AtomS3 / AtomS3 Lite
G1
G2
5V
GND
StickC PLUS / PLUS2
G33
G32
5V
GND
I2C\LED\BUTTON
I2C1(GROVE)
SCL1
SDA1
I2C2(INA3221)
SCL2
SDA2
LED(Charging indicator)
CHAG
Button A
BTN_A
Button B
BTN_B
OLED
OLED
OLED_MOSI
OLED_SCK
OLED_DC
OLED_RST
OLED_CS
BL_EN
Module Size
Protocol
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