11/17/2023 0 Comments Arduino external power supply![]() But I didn't want to connect the GND between the two power supplies together, given they operate at different voltages and currents. My intuition tells me that both power supplies should share the same GND pin. ![]() But it's not clear to me, so I would appreciate a conceptual explanation. So why can my arduino not measure these voltages? I assume it's because the two different power supplies are changing the frame of reference for the ADC pin. I used a multimeter to check the voltages in the external power supply are 11.20V (close enough to 12V) and the voltage from the sensor OUT pin is 1.40V (within the 0V - 5V range I expected). But if I try to read any voltage from the external power supply, the value is random. Because that sketch will be coming from a computer connected via. The question is, what happens when I want to reprogram it (as in, download a new sketch) via FTDI. I will have an external power supply providing 5V to the whole circuit. As seen in the diagram, I can read voltages correctly if they are from the arduino. Basically its a custom circuit with an Atmel with Arduino bootloader, running LED strings. To debug, I made a few more connections from the analog-in pins. I tried reading the value but I get fluctuating readings. But can I do this if the arduino is powered with a different power supply? I have it connected to my laptop with a 5V USB cable. I would like to use my arduino's analog-to-digital converter to read the sensor value. The wind sensor outputs an analog signal up to 5V with the sensor reading. The wind sensor requires 12V to operate, so I powered it with an external power supply (provides 12V DC at 1A). Instead, you can strip and tin the wires to allow them to be easily connected directly to the screw terminal on your. Thus, provided you do not have other things connected to the Arduino. The maximum logic current (I CC1 MAX) drawn by the driver IC at pin 16 is 60mA. I have two components in a circuit: An Arduino Uno R3 and a Wind Sensor Rev. Pin 16, V CC1, is to power the IC itself, ei., its internal logic.
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