Questions tagged [current]

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2answers
41 views

Pi 5V Pin Max Current Before Melting Happens?

I have a hypothetical project in mind I would like to pursue but wanted to ask this before sinking too much time into it. That being having multiple SPI slaves connected to a Pi Zero. From what I've ...
0
votes
1answer
35 views

setting raspberry pi zero to automatically power on after power failure

I'm planning to buy a Raspberry Pi Zero W to remotelly wake on my desktop pc. To do this task I need that the raspberry always stays awake; is there a way to set the raspberry automatically wake on ...
0
votes
1answer
33 views

Can AA batteries have voltage or current spikes?

I'm a noob in raspberry pi and in engineering in general. I had an idea for a project but it requires it to be somewhat portable so I need to power the raspberry somehow. I read this article Where it ...
0
votes
1answer
35 views

Raspberry Pi Model B Current Overdraw from 3.3V Pin

I am using RPi3 ModelB V1.2 for a motor control project. I am connecting Pin1 (3.3V) for power to a micro dc motor. The current drawn by the motor is approx ~70 mA whereas the RPi sources mention that ...
0
votes
0answers
33 views

One Raspberry pi GPIO can drive how many inputs of 74HC245 and 74ABT245?

Please help me understand these calculations. Don't know which parameter to look for to find out Fin in and Fan out of a buffer IC. Thank you
1
vote
1answer
293 views

Powering Raspberry Pi 4 'on the move' using power bank [closed]

There are good official resources that state that recommended power supply must be 3 amps (e.g. official RPi power supply via mains). However, for use 'on the move' or remote locations this may not be ...
-1
votes
2answers
49 views

How can detect a very low voltage (0.2 V) with the Raspberry Pi? [closed]

I'm a beginner in electronic and I want to use a GPIO input to detect 200 mV. Is that possible ? I think that we can increase the voltage, decreasing the amperage. But I don't found a way to do it. ...
2
votes
2answers
158 views

How to detect an electric current in a secondary circuit (12v)?

I want to detect if there is an electric current in the wire where I wrote "here > > > > > >" (on the image) The secondary circuit is a 12v circuit. How can I do this ? ...
1
vote
2answers
350 views

Check status of float switch in water reservoir

I have a standard float switch in a remote water reservoir connected to a normal electric cable (100m+ long). I want to check with a raspberry pi if the float switch is on (i.e. water level is low) or ...