INA219 I2C Zero Drift Bi-directional Current Power Supply Sensor Breakout Monitoring Module

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matuoja voltus ir amperus, galima nustatyti kiek naudoja jėgos tavo variklis ir ar toli baterijai iki mirties

labai gerai valdosi su python

instaliuoti biblioteka:
  sudo pip uninstall pi-ina219
  sudo pip install pi-ina219

https://pypi.python.org/pypi/pi-ina219/1.1.0

Galima panaudoti matuoti baterijos talpą, ta ir bandau padaryti. Pajungiau apie 340 mA magneta kuris kaist po truputi ir valgo baterijos energija. Testuoju baterija:

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<code python>
#!/usr/bin/env python
from ina219 import INA219
from ina219 import DeviceRangeError

from datetime import datetime
import time, threading

SHUNT_OHMS = 0.1

def read():
    ina = INA219(SHUNT_OHMS)
    ina.configure()

    print "Bus Voltage: %.3f V" % ina.voltage()
    try:
        print "Bus Current: %.3f mA" % ina.current()
        print "Power: %.3f mW" % ina.power()
        print "Shunt voltage: %.3f mV" % ina.shunt_voltage()

        with open("curr_volt_read_log.csv", "a") as myfile:
            myfile.write(datetime.utcnow().strftime('%Y-%m-%d %H:%M:%S.%f') + "," + '%.3f' % ina.voltage() + "," + '%.3f' % ina.current() + "," + '%.3f' % ina.power() + "," + '%.3f' % ina.shunt_voltage() + '\n')

    except DeviceRangeError as e:
        # Current out of device range with specified shunt resister
        print e
    
    threading.Timer(1, read).start()

if __name__ == "__main__":
    read()
</code>


piesiai matlab:

<code matlab>
%% read temperature log file and plot chart
fileID = fopen('\\aistis\pihome\home\pi\ina219\curr_volt_read_log.csv','r');
C = textscan(fileID,'%s %f %f %f %f','Delimiter',',');
fclose(fileID);

d.date = datenum(C{1},'yyyy-mm-dd HH:MM:SS.FFF');
d.voltage = C{2};
d.current = C{3};
d.power = C{4};
d.shunt_voltage = C{5};

figure(1);clf; title('NighKonic NCR18650 battery discharge');
subplot(3,1,1);plot(d.date,d.voltage);dynamicDateTicks;grid on; xlabel('time'); ylabel('voltage (V)');
subplot(3,1,2);plot(d.date,d.current);dynamicDateTicks;grid on; xlabel('time'); ylabel('current (mA)');
subplot(3,1,3);plot(d.date,d.power);dynamicDateTicks;grid on; xlabel('time'); ylabel('power (mW)');
</code>