http:\/\/www.waveshare.com\/w\/upload\/d\/d9\/UPS_HAT.7z<\/a><\/p>\n\n\n\nimport smbus\nimport time\n\n# Config Register (R\/W)\n_REG_CONFIG = 0x00\n# SHUNT VOLTAGE REGISTER (R)\n_REG_SHUNTVOLTAGE = 0x01\n\n# BUS VOLTAGE REGISTER (R)\n_REG_BUSVOLTAGE = 0x02\n\n# POWER REGISTER (R)\n_REG_POWER = 0x03\n\n# CURRENT REGISTER (R)\n_REG_CURRENT = 0x04\n\n# CALIBRATION REGISTER (R\/W)\n_REG_CALIBRATION = 0x05\n\nclass BusVoltageRange:\n """Constants for ``bus_voltage_range``"""\n RANGE_16V = 0x00 # set bus voltage range to 16V\n RANGE_32V = 0x01 # set bus voltage range to 32V (default)\n\nclass Gain:\n """Constants for ``gain``"""\n DIV_1_40MV = 0x00 # shunt prog. gain set to 1, 40 mV range\n DIV_2_80MV = 0x01 # shunt prog. gain set to \/2, 80 mV range\n DIV_4_160MV = 0x02 # shunt prog. gain set to \/4, 160 mV range\n DIV_8_320MV = 0x03 # shunt prog. gain set to \/8, 320 mV range\n\nclass ADCResolution:\n """Constants for ``bus_adc_resolution`` or ``shunt_adc_resolution``"""\n ADCRES_9BIT_1S = 0x00 # 9bit, 1 sample, 84us\n ADCRES_10BIT_1S = 0x01 # 10bit, 1 sample, 148us\n ADCRES_11BIT_1S = 0x02 # 11 bit, 1 sample, 276us\n ADCRES_12BIT_1S = 0x03 # 12 bit, 1 sample, 532us\n ADCRES_12BIT_2S = 0x09 # 12 bit, 2 samples, 1.06ms\n ADCRES_12BIT_4S = 0x0A # 12 bit, 4 samples, 2.13ms\n ADCRES_12BIT_8S = 0x0B # 12bit, 8 samples, 4.26ms\n ADCRES_12BIT_16S = 0x0C # 12bit, 16 samples, 8.51ms\n ADCRES_12BIT_32S = 0x0D # 12bit, 32 samples, 17.02ms\n ADCRES_12BIT_64S = 0x0E # 12bit, 64 samples, 34.05ms\n ADCRES_12BIT_128S = 0x0F # 12bit, 128 samples, 68.10ms\n\nclass Mode:\n """Constants for ``mode``"""\n POWERDOW = 0x00 # power down\n SVOLT_TRIGGERED = 0x01 # shunt voltage triggered\n BVOLT_TRIGGERED = 0x02 # bus voltage triggered\n SANDBVOLT_TRIGGERED = 0x03 # shunt and bus voltage triggered\n ADCOFF = 0x04 # ADC off\n SVOLT_CONTINUOUS = 0x05 # shunt voltage continuous\n BVOLT_CONTINUOUS = 0x06 # bus voltage continuous\n SANDBVOLT_CONTINUOUS = 0x07 # shunt and bus voltage continuous\n\n\nclass INA219:\n def __init__(self, i2c_bus=1, addr=0x40):\n self.bus = smbus.SMBus(i2c_bus);\n self.addr = addr\n\n # Set chip to known config values to start\n self._cal_value = 0\n self._current_lsb = 0\n self._power_lsb = 0\n self.set_calibration_32V_2A()\n\n def read(self,address):\n data = self.bus.read_i2c_block_data(self.addr, address, 2)\n return ((data[0] * 256 ) + data[1])\n\n def write(self,address,data):\n temp = [0,0]\n temp[1] = data & 0xFF\n temp[0] =(data & 0xFF00) >> 8\n self.bus.write_i2c_block_data(self.addr,address,temp)\n\n def set_calibration_32V_2A(self):\n """Configures to INA219 to be able to measure up to 32V and 2A of current. Counter\n overflow occurs at 3.2A.\n ..note :: These calculations assume a 0.1 shunt ohm resistor is present\n """\n # By default we use a pretty huge range for the input voltage,\n # which probably isn't the most appropriate choice for system\n # that don't use a lot of power. But all of the calculations\n # are shown below if you want to change the settings. You will\n # also need to change any relevant register settings, such as\n # setting the VBUS_MAX to 16V instead of 32V, etc.\n\n # VBUS_MAX = 32V (Assumes 32V, can also be set to 16V)\n # VSHUNT_MAX = 0.32 (Assumes Gain 8, 320mV, can also be 0.16, 0.08, 0.04)\n # RSHUNT = 0.1 (Resistor value in ohms)\n\n # 1. Determine max possible current\n # MaxPossible_I = VSHUNT_MAX \/ RSHUNT\n # MaxPossible_I = 3.2A\n\n # 2. Determine max expected current\n # MaxExpected_I = 2.0A\n\n # 3. Calculate possible range of LSBs (Min = 15-bit, Max = 12-bit)\n # MinimumLSB = MaxExpected_I\/32767\n # MinimumLSB = 0.000061 (61uA per bit)\n # MaximumLSB = MaxExpected_I\/4096\n # MaximumLSB = 0,000488 (488uA per bit)\n\n # 4. Choose an LSB between the min and max values\n # (Preferrably a roundish number close to MinLSB)\n # CurrentLSB = 0.0001 (100uA per bit)\n self._current_lsb = .1 # Current LSB = 100uA per bit\n\n # 5. Compute the calibration register\n # Cal = trunc (0.04096 \/ (Current_LSB * RSHUNT))\n # Cal = 4096 (0x1000)\n\n self._cal_value = 4096\n\n # 6. Calculate the power LSB\n # PowerLSB = 20 * CurrentLSB\n # PowerLSB = 0.002 (2mW per bit)\n self._power_lsb = .002 # Power LSB = 2mW per bit\n\n # 7. Compute the maximum current and shunt voltage values before overflow\n #\n # Max_Current = Current_LSB * 32767\n # Max_Current = 3.2767A before overflow\n #\n # If Max_Current > Max_Possible_I then\n # Max_Current_Before_Overflow = MaxPossible_I\n # Else\n # Max_Current_Before_Overflow = Max_Current\n # End If\n #\n # Max_ShuntVoltage = Max_Current_Before_Overflow * RSHUNT\n # Max_ShuntVoltage = 0.32V\n #\n # If Max_ShuntVoltage >= VSHUNT_MAX\n # Max_ShuntVoltage_Before_Overflow = VSHUNT_MAX\n # Else\n # Max_ShuntVoltage_Before_Overflow = Max_ShuntVoltage\n # End If\n\n # 8. Compute the Maximum Power\n # MaximumPower = Max_Current_Before_Overflow * VBUS_MAX\n # MaximumPower = 3.2 * 32V\n # MaximumPower = 102.4W\n\n # Set Calibration register to 'Cal' calculated above\n self.write(_REG_CALIBRATION,self._cal_value)\n\n # Set Config register to take into account the settings above\n self.bus_voltage_range = BusVoltageRange.RANGE_32V\n self.gain = Gain.DIV_8_320MV\n self.bus_adc_resolution = ADCResolution.ADCRES_12BIT_32S\n self.shunt_adc_resolution = ADCResolution.ADCRES_12BIT_32S\n self.mode = Mode.SANDBVOLT_CONTINUOUS\n self.config = self.bus_voltage_range << 13 | \\\n self.gain << 11 | \\\n self.bus_adc_resolution << 7 | \\\n self.shunt_adc_resolution << 3 | \\\n self.mode\n self.write(_REG_CONFIG,self.config)\n\n def getShuntVoltage_mV(self):\n self.write(_REG_CALIBRATION,self._cal_value)\n value = self.read(_REG_SHUNTVOLTAGE)\n if value > 32767:\n value -= 65535\n return value * 0.01\n\n def getBusVoltage_V(self):\n self.write(_REG_CALIBRATION,self._cal_value)\n self.read(_REG_BUSVOLTAGE)\n return (self.read(_REG_BUSVOLTAGE) >> 3) * 0.004\n\n def getCurrent_mA(self):\n value = self.read(_REG_CURRENT)\n if value > 32767:\n value -= 65535\n return value * self._current_lsb\n\n def getPower_W(self):\n self.write(_REG_CALIBRATION,self._cal_value)\n value = self.read(_REG_POWER)\n if value > 32767:\n value -= 65535\n return value * self._power_lsb\n \nif __name__=='__main__':\n\n # Create an INA219 instance.\n ina219 = INA219(addr=0x42)\n while True:\n bus_voltage = ina219.getBusVoltage_V() # voltage on V- (load side)\n shunt_voltage = ina219.getShuntVoltage_mV() \/ 1000 # voltage between V+ and V- across the shunt\n current = ina219.getCurrent_mA() # current in mA\n power = ina219.getPower_W() # power in W\n p = (bus_voltage - 6)\/2.4*100\n if(p > 100):p = 100\n if(p < 0):p = 0\n\n # INA219 measure bus voltage on the load side. So PSU voltage = bus_voltage + shunt_voltage\n #print("PSU Voltage: {:6.3f} V".format(bus_voltage + shunt_voltage))\n #print("Shunt Voltage: {:9.6f} V".format(shunt_voltage))\n print("Load Voltage: {:6.3f} V".format(bus_voltage))\n print("Current: {:9.6f} A".format(current\/1000))\n print("Power: {:6.3f} W".format(power))\n print("Percent: {:3.1f}%".format(p))\n print("")\n\n time.sleep(2)\n<\/code><\/pre>\n\n\n\n\u62dc\u4e86\u4e00\u4e0bGOOGLE, \u53c8\u662fraspi-config\u88e1\u7684\u8a2d\u5b9a, \u8981\u628ai2c enable\u5373\u53ef.<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5e6braspberry\u88dd\u4e86ups_hat ht […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28],"tags":[],"class_list":["post-691","post","type-post","status-publish","format-standard","hentry","category-raspberry"],"_links":{"self":[{"href":"https:\/\/wp.vicds.com\/index.php?rest_route=\/wp\/v2\/posts\/691","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.vicds.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.vicds.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.vicds.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.vicds.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=691"}],"version-history":[{"count":1,"href":"https:\/\/wp.vicds.com\/index.php?rest_route=\/wp\/v2\/posts\/691\/revisions"}],"predecessor-version":[{"id":692,"href":"https:\/\/wp.vicds.com\/index.php?rest_route=\/wp\/v2\/posts\/691\/revisions\/692"}],"wp:attachment":[{"href":"https:\/\/wp.vicds.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=691"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.vicds.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=691"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.vicds.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}