89 lines
2.1 KiB
Python
89 lines
2.1 KiB
Python
from maix import i2c, pinmap, time
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# 配置 I2C1 引脚（请根据实际连接修改）
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pinmap.set_pin_function("P18", "I2C1_SCL")
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pinmap.set_pin_function("P21", "I2C1_SDA")
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bus = i2c.I2C(1, i2c.Mode.MASTER)
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INA226_ADDR = 0x40
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# 寄存器定义
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REG_CONFIGURATION = 0x00
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REG_BUS_VOLTAGE = 0x02
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REG_CALIBRATION = 0x05
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# 校准值（不读取电流/功率时也可以省略）
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CALIBRATION_VALUE = 0x1400
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def write_register(reg, value):
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data = [(value >> 8) & 0xFF, value & 0xFF]
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bus.writeto_mem(INA226_ADDR, reg, bytes(data))
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def read_register(reg):
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data = bus.readfrom_mem(INA226_ADDR, reg, 2)
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return (data[0] << 8) | data[1]
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def init_ina226():
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write_register(REG_CONFIGURATION, 0x4527)
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write_register(REG_CALIBRATION, CALIBRATION_VALUE)
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def get_bus_voltage():
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raw = read_register(REG_BUS_VOLTAGE)
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return raw * 1.25 / 1000 # 单位 V
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def voltage_to_percent(voltage):
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if voltage >= 4.20:
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return 100
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elif voltage >= 4.15:
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return 95
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elif voltage >= 4.10:
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return 90
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elif voltage >= 4.05:
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return 85
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elif voltage >= 4.00:
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return 80
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elif voltage >= 3.95:
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return 75
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elif voltage >= 3.90:
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return 70
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elif voltage >= 3.85:
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return 65
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elif voltage >= 3.80:
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return 60
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elif voltage >= 3.75:
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return 55
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elif voltage >= 3.70:
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return 50
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elif voltage >= 3.65:
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return 45
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elif voltage >= 3.60:
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return 40
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elif voltage >= 3.55:
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return 35
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elif voltage >= 3.50:
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return 30
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elif voltage >= 3.45:
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return 25
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elif voltage >= 3.40:
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return 20
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elif voltage >= 3.35:
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return 15
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elif voltage >= 3.30:
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return 10
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elif voltage >= 3.20:
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return 5
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else:
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return 0
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# 初始化 INA226
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init_ina226()
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# 主循环，只显示电量百分比
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while True:
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voltage = get_bus_voltage()
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battery_percent = voltage_to_percent(voltage)
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print(f"当前电压: {voltage:.3f} V")
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print(f"估算电池电量: {battery_percent} %\n")
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time.sleep(2000)
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