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. 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 x 24 x 11mm Package Dimensions 136 x 92 x 14mm Product Weight 7.6g Package Weight 12.9g Resources * Product Wiki Package Contents * 1x Timer Power Unit * 1x HY2.0 4-pin Grove Cable (20cm) https://elecena.pl/product/27308467/timer-power-unit-with-oled-display-ina3221 2024-11-20 https://elecena.pl/product/27308467/timer-power-unit-with-oled-display-ina3221 2024-11-29 https://elecena.pl/product/27308467/timer-power-unit-with-oled-display-ina3221 2024-11-30 https://elecena.pl/product/27308467/timer-power-unit-with-oled-display-ina3221 2025-08-06 https://elecena.pl/product/27308467/timer-power-unit-with-oled-display-ina3221 2025-11-28 https://elecena.pl/product/27308467/timer-power-unit-with-oled-display-ina3221 2025-11-29