This Timer Power Unit is a smart power supply device that charges and discharges, has timed switching and boosts output. Power is provided through a Type-C connector and can also connect to an external rechargeable battery through a 1.25-2P interface. With an internal STM32 microcontroller handling RTC and overall control, you can set automatic power on and off times.
This includes a built-in battery charging circuit that supports a charging current of 330mA and an integrated DC-DC boost circuit that delivers a 5V/800mA power output (up to 1400mA with a fully charged battery) to external devices through the Grove port. The INA3221 sensor provides real-time monitoring of input and output current and voltage, giving you a clear view of power performance.
A 0.66" OLED display with two side buttons can check the system status and adjust settings. You can configure parameters such as power scheduling directly using the buttons or through the Grove port using I2C commands. This makes the unit easy to integrate into smart systems or timed control setups.
Features
RTC cycle timing control
Battery power supply
Built-in DC-DC boost circuit
Current/voltage monitoring
OLED display
Grove interface
Button-controlled power on/off mode
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" OLED display, resolution 64 x 48, SPI communication
Connectors
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.
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