![]() ![]() Does anyone have a solution to my problem, I would appreciate any input. This does not seem to me to be a complete solution, my fear is that it will still harm the pin in the long run. I am considering placing a resistor in series to lower the voltage to a level (<.5Vdc ?) where the pin will recognize it as HIGH, yet not enough to power the board. I have a separate power supply through the USB plug that is intended to power the board itself. Connect Arduino GND pin to the cathode of the LED. NOTE: regardless of the input used, Arduino has a 3.3 V output socket to power loads operating at this voltage in fact a second regulator, right for the purpose of generating 3.3 V, is directly connected to the 5 V. Like the aformentioned post the UNO board is unintentionally powered from the input pin. Connect the anode of the LED to one end of the resistor and the other end of the resistor to digital I/O pin 8 on the Arduino board. The pin will receive the 5Vdc signal for an extended period of time (until the room is cool enough for the thermostat to turn the signal off. When the thermostat calls for cooling a 5Vdc signal is sent to pin 2. As we can see, the input power can come from a few different sources: The DC jack (center positive) USB connector Vin header socket 5 V header socket Figure 1: the power supply portion of the Arduino board. Multiple Input Management subsystem This is the part that manages multiple inputs. Voltage Regulator subsystem This is the part that generates 5V. I am connecting a thermostat to the input pin. The latter system is also responsible for generating the 3.3V onboard voltage. I have written a sketch that looks for a HIGH signal on an input pin ( #2 in my case). The Arduino Uno’s 16MHz crystal Oscillator. The main Arduino peripheral -ATmega 328P. ![]() Power jack (Barrel connector) on the Arduino. Now I want to make the project mobile, so I am looking for an adequate power supply for my Arduino. Here’s a list of all the different Arduino parts that we will be taking a gander at: The Arduino Uno’s USB connection. I have read the topic with the same subject heading but there was no solution, only a brief mention of the harmful consequences of doing this. Hello, I am quite new to electronics and Arduino, but so far I have successfully developed my own flash controller for photographic purpose. ![]()
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