Questions tagged [current]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
2answers
50 views

Which is better to measure voltage and current,INA219 or current/voltage sensors? [closed]

Im doing a DIY battery and after that I want to measure the results and displaying the results in Raspberry Pi. I wanted to know if the measurement could be better done using INA219 or voltage/current ...
2
votes
1answer
68 views

raspberry pi prevent overload current from turning on a high current motor

I am trying to use only 1 power supply instead of 2 to power Raspberry Pi and motor, but when I turn on the high current (>10A) motor, it will lead to the Raspberry Pi restarting. I guess it is ...
0
votes
1answer
21 views

Bespoke Power Supply cable issue

I am trying to create an in-car (headrest) entertainment system using the Pi 3B with 7" screen using OSMC, when OSMC is shutdown it does not fully power off the screen, I can detect the shutdown ...
0
votes
1answer
33 views

GPIO pin not providing as much current as 3.3V pin

I have an infrared led which works at 3.3V. This is the led . Edit: I couldn't find any specific documentation, it's one of those led you usually attach to rpi infrared cameras. If I attach it ...
0
votes
0answers
37 views

Measuring GPIO current with INA219

I'd like to build a simple circuit that does the following: controls a RGB LED (RPi 4 has 4 PWM outputs, so I could use 3 of them to control the LED) measures the current draw of each PWM output, ...
0
votes
0answers
49 views

Retropie Battery Powered Handheld

I am planning to build a Retropie Handheld and want to use: 2 of these in series: https://www.jaycar.com.au/14500-rechargeable-li-ion-battery-800mah-3-7v-nipple/p/SB2300 paired with one of these: ...
0
votes
2answers
61 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
67 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
39 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
50 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 ...
1
vote
1answer
415 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
61 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
228 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
1answer
472 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 ...
33
votes
3answers
38k views

Why is a resistor needed for LEDs?

While looking for a basic task to get familiar with the Raspberry Pi and its GPIO pins, I decided that driving an LED sounded simple enough. While investigating how to go about this task I've noticed ...