Hi there, I want to wire up multiple sensors and modules to an Arduino micro. These include a
DHT11 sensor, DS3231 clock module, 20x4 LCD module, HC-05, 16 button keypad module, and an Analog joystick. With this number of modules and sensors connected to the Arduino, I am thinking to connect multiple modules to the 5v and 3.3v pins (around 2-3 connections per 5v and 3.3v pin). Will this draw too much power? (The only power source will be the micro USB port on the Arduino) .
Look up, read data sheets for each component and find out how much 3.3 resp. 5.0 volt pin current You need. The compare with controller 3.3 volt max current. USB is usually limited to 0.5 Amp.
Each component will require current at a specified voltage. Find out how much current by scouring data sheets or other sources or by direct measurement and at what voltage.
Add the 3.3V currents. If it is more than about 50mA, consider an external source of 3.3V.
Add the 5V currents. If it is more than around 400mA, consider an external 5V source.
Don't forget that your Arduino board needs current, too. Around 50mA for an Uno, Nano, Mega by themselves.
