Precision Timer Power Unit Featuring OLED Screen and High-Accuracy INA3221 Current/Voltage Monitoring

Description

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Description

Unit TimerPWR is a timed power supply unit with main functions such as “charge/discharge + timed switching + screen display + boost output”. It features an embedded STM32 microcontroller for implementing RTC (Real-Time Clock) and overall control, allowing users to set automatic power-on and power-off times according to their needs.

The unit is powered via a Type-C interface and can be connected to a rechargeable battery through a 1.25-2P interface. It includes a built-in battery charging circuit that supports a charging current of 330mA. Additionally, it features a built-in DC-DC boost circuit, which can provide a 5V/800mA (1400mA@1C battery-powered) power output to external devices through the Grove port. Moreover, it includes an INA3221 sensor for real-time monitoring of input and output current and voltage.

This unit is equipped with a 0.66-inch OLED display and two side buttons for user interaction, enabling users to easily view the system’s real-time status and modify settings. Users can configure settings using the side buttons or via I2C commands through the Grove interface. This product is suitable for applications such as smart homes, industrial automation, and timed control devices.

Features

• RTC cyclic timing control
• Battery-powered
• Built-in DC-DC boost circuit
• Current/voltage monitoring
• OLED display
• Grove interface
• Button-controlled power on/off mode

Includes

• 1 x Unit TimerPWR
• 1 x HY2.0-4P Grove cable (20cm)

Applications

• Timed control devices
• Portable electronic devices
• Sensor node power supply

Specifications

Specification	Parameters
MCU	STM32G031G8U6
Input Voltage	Supports 5V DC input (via Type-C interface)
Output Voltage	Built-in DC-DC boost circuit, outputs 5V for external devices
Battery Power	3.7V polymer lithium battery
Display	0.66-inch OLED display, 64×48 resolution, SPI communication
Interfaces	Type-C interface: for battery charging (cannot directly power the Grove port) Grove interface: for external sensors and module expansion, supports communication and external power supply Battery interface: 1.25mm@2P
I2C Communication Address	0x56
Current Sensor	INA3221
Charging Current	DC 5V@330mA
Charging Chip	LGS4056H
Charging Temperature	55°C
Grove Port Max Output Current	Related to battery capacity and discharge capability, e.g.: 1400mAh@1C 3.7V:DC4.96V@800mA 500mAh@1C 3.7V: DC4.97V@700mAh 110mAh@1C 3.7V: DC5.03V@400mAh
Standby Current	DC4.2V@36.67uA
Operating Temperature	0 ~ 40°C
Product Size	40.0 x 24.0 x 11.0mm
Product Weight	7.5g
Package Size	138.0 x 93.0 x 12.0mm
Gross Weight	13.2g

Power Supply Requirements: When using the Unit TimerPWR, it must be connected to a lithium battery. Its USB interface is only used for charging the battery and cannot be directly used for output power supply.

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