Questions tagged [current]
The current tag has no usage guidance.
20
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Where to find LED values of the Raspberry Pi Pico MicroPython Learning Kit?
I am getting started with a pico and I got the Raspberry Pi Pico MicroPython Learning Kit from waveshare (https://thepihut.com/products/raspberry-pi-pico-micropython-learning-kit-pico-included)
It ...
- 101
0
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2
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137
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Max current on GPIO
I have 20 ldr photoresistors that I will connect to GPIO.
They are connected pretty much like this (but without led):
I have also a Hifiberry Dac2Pro connected as a hat.
https://www.hifiberry.com/...
- 115
0
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47
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Current draw Raspberry Pi 4 measurement results. Does anyone have more data?
I thought this would help with designing HAT power. Does anyone have similar measurements while running software and connected devices?
Scant information on the current draw. I measured through the ...
- 19
-1
votes
1
answer
321
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Insufficient power for RPI + 7" Touch Screen
I have a raspberry pi 3B. It is connected to a 7" RPI Touch screen, (made by RPI). The screen gets 5v from the pi and the pi is connected to a 5v, 2.1A USB power pack.
For some reason the power ...
- 101
0
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1
answer
277
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can I use a 12v car battery to connect to a L298N h-bridge to control two 12v dc motor [closed]
I am new to the raspberry pi world and electronic in general. so I am wondering if it is safe to hook up 20 AWG wires to a car battery and have those wires going into a L298N h-bridge to power 2 ...
- 11
0
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2
answers
439
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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 ...
- 25
2
votes
1
answer
286
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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 ...
- 123
0
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1
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27
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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 ...
-2
votes
1
answer
151
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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 ...
- 1
0
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0
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127
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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, ...
- 113
-1
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1
answer
90
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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
2
answers
390
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 ...
- 111
0
votes
1
answer
1k
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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
1
answer
97
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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 ...
- 23
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votes
1
answer
165
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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
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1
answer
1k
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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 ...
- 11
-1
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2
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127
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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.
...
- 133
3
votes
2
answers
540
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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 ?
...
- 133
2
votes
1
answer
688
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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 ...
- 391
37
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3
answers
39k
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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 ...
- 489