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3

On the nodeMCU board all the 3.3v pins have continuity. That means they all do the same thing. And yes, you can apply ~3.3v to them. I have trouble with voltages under ~2.8 though, 2.5v is likely not going to work. Use a buck+boost to keep it 3.3v if needed. For cheap dc/dc converters, I strongly prefer ones with XL semi chips; clean enough to please the ...


2

The official page for the Nano 33 BLE Sense mentions various things including the datasheet for the light sensor. That appears to be much more sophisticated than an LDR. According to the sensor documentation (above): Upon power-up, POR, the device initializes and immedi-ately enters the low power SLEEP state. In this operational state the internal ...


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In fact, for a project like this, you should use two Arduinos, one as SLAVE and the other as MASTER. You mentioned 4 sensors for measuring water quality, but you will have more modules such as RTC and MicroSD to store the data. So, I think you should use Slave to colect the data from sensors using the Tentacle Shield, and the other Arduino as Master, to ...


1

The circuit in the image shows the plan of the Arduino Uno, as you can see the GND pin under AREF and in the GND under the Power pin VCC are connected. you can double-check this with a tester and figure it out. so yes, they are internally connected. now, in your breadboard you have connected GND to VIN, that's the problem, Vin is an input voltage that is ...


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