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--- raspberrypi:ina219 [2017/03/18 14:03] – aistis
+++ raspberrypi:ina219 [2017/03/18 14:09] (current) – aistis
@@ Line 5: / Line 5: @@
 matuoja voltus ir amperus, galima nustatyti kiek naudoja jėgos tavo variklis ir ar toli baterijai iki mirties
-labai gerai valdosi su python:
+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:
+Galima panaudoti matuoti baterijos talpą, ta ir bandau padaryti. Pajungiau apie 340 mA magneta kuris kaist po truputi ir valgo baterijos energija. Testuoju baterija:
+{{:raspberrypi:pasted:20170318-140859.png}}
 {{:raspberrypi:pasted:20170318-140251.png}}
+<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>