The datasheet of the controller (usually HD44780 for a 16x2 if I'm not mistaken) will tell you check the specification called input leakage (I IL and I IH)ģ) What is the current for a 3.3V pin, 5V pin and an analog pin? (I have read different values for every case.) In general you can ignore the input pins they are high impedance and will load the system with a few microamps. an Arduino Uno requires a minimum of 7V on the V in pin once the voltage drops below that, the Arduino Uno will start misbehaving.Ģ) How do I measure the current for LCD 16X2? Should I measure the the current for all the pins that are connected with 5V? And then sum the currents? However, the curves are important as they show the voltage that the battery will supply "over time". So theoretically, if you draw 50 mA from it, it will last just over 13 hours. That battery can deliver 673 mA for a maximum of an hour. Powering all the components with the above way, the system works as I want.ġ) I want to calculate the power consumption of my system (Not with multimeter, but from datasheet).Ģ) If I power Arduino with a 9V battery (For instance this battery: Panasonic pro power 9V - ) and the SIM900 with another 9V battery, will the system work? And how long will the system lasts?ġ) With an alkaline 9V battery (For example this) and having measured the total required current, how can i calculate how long will it last? If I understand well, i can check it from the 1st & 2nd diagram on page 2 of the above datasheet. 2) 3 LEDs for typical use, 3 Resistors (330 Ω)ġ) Arduino Mega 2560 is connected with USB on laptop.Ģ) SIM900 is powered by a power supply 12V/2A.ģ) NEO-6M is powered by 3.3V pin of Arduino Mega 2560.Ĥ) LEDs are connected to Analog pins of Arduino Mega 2560.ĥ) All the rest components are powered by the same 5V pin of Arduino Mega 2560.
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