Description The Timer Power Unit is a compact timed power supply module for charge/discharge control, scheduled switching, status display, and boosted 5V output. It integrates an STM32 microcontroller for RTC timing and overall control, allowing automatic power-on and power-off schedules for embedded devices. The Timer Power Unit uses Type-C for battery charging and connects to a 3.7V rechargeable lithium battery through a 1.25mm 2P battery connector. A built-in charging circuit supports 330mA charging current, while the DC-DC boost circuit can supply 5V output through the Grove port for external modules. With an INA3221 current sensor, a 0.66-inch OLED display, two side buttons, and Grove I2C control, the Timer Power Unit lets users monitor input/output voltage and current, adjust operating modes, and build portable timed power systems. Notice: The Timer Power Unit must be connected to a lithium battery during use. The USB Type-C interface is only for charging the battery and cannot be used directly as the output power supply. Features RTC cyclic timing and timed power switching. Built-in lithium battery charging circuit with 330mA charging current. DC-DC boost output for 5V Grove-powered external devices. INA3221 current and voltage monitoring for input and output status. 0.66-inch OLED display and two side buttons for local configuration. Grove I2C communication for software-based setup and status reading. Specifications Type Timer Power Unit timed power supply module MCU STM32G031G8U6 Input voltage 5V DC input through Type-C interface Output voltage Built-in DC-DC boost circuit outputs 5V for external devices Battery 3.7V polymer lithium battery Display 0.66-inch OLED display, 64 x 48 resolution, SPI communication Interfaces Type-C for battery charging; Grove for external sensors, module expansion, communication, and external power; 1.25mm 2P battery interface I2C address 0x56 Current sensor INA3221 Charging current DC 5V at 330mA Charging chip LGS4056H Charging temperature 55C Grove port max output current Depends on battery capacity and discharge capability, such as 1400mAh at 1C: DC 4.96V at 800mA; 500mAh at 1C: DC 4.97V at 700mA; 110mAh at 1C: DC 5.03V at 400mA Standby current DC 4.2V at 36.67uA Operating temperature 0 ~ 40C Item dimensions 40.0 x 24.0 x 11.0mm Item weight 7.5g Package size 138.0 x 93.0 x 12.0mm Gross weight 13.2g Applications Timed control devices that need automatic power-on and power-off schedules. Portable electronic devices powered by rechargeable lithium batteries. Sensor node power supply where the Timer Power Unit provides boosted Grove output and status monitoring. Smart home and industrial automation projects requiring scheduled low-power operation. Product List 1 x Unit TimerPWR 1 x HY2.0-4P Grove cable (20cm) Other Content Before deployment, select a lithium battery with suitable capacity and discharge capability for the expected Grove load. The Timer Power Unit is especially useful when a system needs to remain off most of the time and wake only at scheduled intervals. Resources TimerPWR document TimerPWR schematic PDF INA3221 current and voltage monitor datasheet LGS4056H battery charger datasheet M5Unit-TimerPWR Arduino library TimerPWR UiFlow2 API documentation TimerPWR internal firmware repository TimerPWR I2C protocol PDF FAQ Can it run without a lithium battery? No. The Timer Power Unit must be connected to a lithium battery during use because the Type-C port is only for charging. Can the Type-C port directly power Grove output? No. The Type-C port charges the battery, while the boosted 5V output is provided through the Grove port from the battery-powered circuit. How is the timing function configured? The Timer Power Unit can be configured with its side buttons or through Grove I2C commands for timed power control.
