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

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:

#!/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()

piesiai 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)');