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Questions tagged [raspberry-pi]

The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. There have been several generations of the device with improved performance, more memory, and more connectivity. This tag should be used for electrical engineering questions that involve the use of a Raspberry Pi. For questions about the Raspberry Pi itself see the raspberrypi.stackexchange.com Raspberry Pi specific forum.

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3answers
128 views

Controling Mosfet by 3,3V Raspberry Pi GPIO Pin

So I'm currently working on a project where I need an IR camera with two IR Leds attached to it. The camera looks something like this: https://rads.stackoverflow.com/amzn/click/com/B01ICLLOZ8 These ...
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2answers
45 views

Power 9 IR LEDs 850 nm with a forward voltage of 1.7 V and forward current of 100mA

I am looking to power 9 IR LEDs 850 nm with a forward voltage of 1.7 V and current of 100mA. i want to make a circuit where i can use a small power supply or could I use the raspberry pi to power it? ...
1
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1answer
202 views

First time using a Raspberry 3B+ for 1.8v SPI BIOS flashing, I have some questions first

So this is the first time I'm attempting to flash a BIOS chip using a Raspberry Pi 3B+. I have the following items with me, a SOIC-8 clip, a Bi-Directional Logic Level Converter, and a Raspberry Pi ...
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0answers
55 views

RaspberryPi: Load cells and HX711 amplifier

I've created an app that will read 10 weighing scales at the same time with separate values but since some wires are like 1 meter long, I get so much noises in the values. I just wanna know if what's ...
1
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3answers
392 views

Raspberry Pi Super Capacitor On Battery Loss

I am looking to provide power to my raspberry Pi upon power loss from 5v power supply. It just needs to provide power long enough for the Pi to safely shutdown (with the setup I have, I am estimating ...
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2answers
173 views

Can i use I2C level shifters to power digital LED strips

Can I use I²C level shifters to power digital LED strips, more specifically, WS2812B strips? I can only find I²C level shifters, are they ok?
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2answers
117 views

Linux (OS) on Custom Hardware (Custom Motherboard) [closed]

We are designing and producing our custom high-speed boards consisting of FPGA and gigabit ethernet signals. Hence, we are not professional for high-speed motherboard design but know some issues like ...
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3answers
882 views

Can I connect a DC high voltage booster directly to my Raspberry Pi? [closed]

I have one of these modules: Is it safe to connect it to two pins to my Raspberry Pi, directly, and turn it on by emitting HIGH on one of the pins (the other ...
0
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1answer
61 views

Low current RPi GPIO inverter

What is the lowest current way of inverting the output from a GPIO pin? I have a solar board that has an add-on that can turn a USB port power off if a LiPO gets below 3.3v. The problem is, they ...
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0answers
40 views

MCP23017 working sporadically

So I've got two MCP23017's on the same I2C bus connected to a RPi. One is addressed 0x20, the other 0x24. The RPi is running my GUI which in turn controls the MCP's which switch 16-way relay boards. ...
1
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3answers
151 views

High resolution angular position (~0.5 degree) measurement [duplicate]

I am attempting to replace a light/mirror sensor to measure the slight low speed oscillations/ rotations of a disc over a period of time. I want to record the angular position, but I wanted to find a ...
1
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1answer
80 views

PCF8591 I2C Problems on Raspberry Pi

I am using 3 PCF8591 ADC connected via i2c to a raspberry pi. At first all 3 of the ADC worked. All of a sudden I started having issued with them. Occasionally one of the i2c devices stops showing up ...
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2answers
147 views

LED strip is flickering, but when I touch the data wire to the Raspberry Pi, it's almost fixed

simulate this circuit – Schematic created using CircuitLab Figure 2. Schematic tidied up by @Transistor. I have a Raspberry Pi which controls a 12V addressable LED strip. When the data wire is ...
0
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0answers
79 views

Raspberry Pi GPIO output not working with MOSFET N Channel Switch

My circuit is below - I'm trying to switch a solenoid valve using a Raspberry Pi. I have tested the MOSFET switch with the dedicated 3v3 pin on the Raspberry Pi, and have also tested that GPIO pin ...
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2answers
77 views

Addressing 45 Inputs Down to 6 pin Output

I'm looking for a chip which could minimize ~45 button inputs down to an 6 pin input for use with Raspberry Pi. I know this is a simple problem and it has likely been solved before, but as an ...
1
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0answers
84 views

L298N motor driver not working after connecting SPST switch

So when I had all wired as depicted in the first image, it worked fine, no problems. The red LED on the L298N board was illuminated and the dc motor was following commands from my Raspberry Pi. Now I ...
0
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3answers
239 views

How to mount four 6-wire 10V load cells on Arduino or Raspberry Pi?

I want to connect four 6-wire load cells (Tedea Huntleigh Compression & Tension Load Cell 300kg, 15V dc, IP67, product page and datasheet) into an Arduino or Raspberry Pi and get four independent ...
1
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2answers
108 views

Unexpected results when measuring MPU6050 sample rate with RaspberryPi

MPU6050 datasheet says that maximum accelerometer data output is 1Khz, so in theory when measuring time it takes to receive 1000 data samples through I2C, so I should receive all data in no less than ...
1
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1answer
36 views

Switching 3.3V with a Raspberry Pi gpio pin

I recently bought an IR Camera for my Raspberry Pi, something like this: https://www.amazon.com/kuman-Raspberry-Camera-Module-Supports/dp/B01ICLLOZ8/ref=mp_s_a_1_17?crid=M3FSU2COLT5W&keywords=ir+...
0
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1answer
65 views

ADS1115 differential output

I have the output of a wheatstone bridge going into an ADS1115. I am exciting the bridge with a 24VDC supply and the ADS1115 with 3.3VDC through a Raspberry Pi. The issue I am having is that when I ...
0
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1answer
54 views

Voltage drop across buck converter

In my robot, I plan to have a GPIO pin on my Raspberry Pi connected to the insertion detection pin (pin 3) of a barrel jack (schematic here) so that my code can tell when the robot is externally ...
0
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1answer
55 views

ADS1256 ADC Not Reading Full Range

I am using an ADS1256 ADC chip (in the form of a Waveshare High-Precision AD/DA Board). I am using a 5V reference voltage, but I can't seem to read full scale. 0V reads out -344 bits (~0V) 3.3V ...
0
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1answer
315 views

Reading a MD25Q128SIG SPI flash memory with raspberry pi

I'm trying to read a MD25Q128SIG SPI flash memory with my raspberry pi, you can find its datasheet here: http://www.firstjit.com/Uploadfiles/20160121152131319.pdf Here are raspberry pi pinouts: Here ...
0
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1answer
21 views

(RasPi) Trying to control 2 different water pumps with different relays

PS: This is for a school project and I'm not very experienced with electronics. I'm trying to create a flush system. I need to control 2 different motors, it's a single iteration circuit with a timer,...
0
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1answer
46 views

Raspbery Pi GPIO + 7400 on a keyboard matrix. Source or sink?

I want to run a large switch matrix from a Raspberry Pi GPIO with the usual diode setup. I'm planning to chain some 74HC595 shift registers for the rows and read the columns from the Raspberry Pi GPIO....
2
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4answers
135 views

LiPo Voltage Drops

I am experiencing voltage drops with the following setup and I hope someone with mad electronics skills can explain my mistake to me: Raspberry Pi 3 Model B TFP401 Display Driver 7.0 Inch TFT Display ...
0
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2answers
197 views

Raspberry Pi not Compatible with Mosfet?

This is my mosfet datasheet RFP30N06LE i have my schematic setup exactly like this (except powering a 12v load not 60v) and even confirming with a multimeter when i set my gpio pin to high that there ...
0
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1answer
162 views

Latching switch to single pulse circuit? (monostable multivibrator with 555?)

I am looking at using a latching switch (SPDT) to momentarily connect two pins. This is for a power button for a raspberry pi, so to power the machine from a hold state you have to momentarily short ...
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0answers
46 views

RPi USB to Serial testing

I have a system like this: RPi -> FTDI(USB UART IC) -> RS485 transceiver -> RS485 TO USB board -> PC I'm having some trouble testing RS485 communication between the RPi and the PC. I'm using a simple ...
0
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1answer
219 views

amplifier for 10V LED dimmer control using Raspberry Pi

My problem is I need to have an amplifier circuit design - schematic + components BOM with specific model information that is able to provide a dimmable output signal (Vout) 0.2-10V <0.8A for a set ...
0
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1answer
65 views

Connect servo and dc motor to raspberry pi

I'm currently working on a project where I have build a RC car with one DC motor (forward/backward) and one servo motor (steering). I'm a newbie with electronics so I figured out by myself I needed a ...
0
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0answers
51 views

FX1901 force sensor connection to Raspberry Pi

Has anyone connected an FX1901 force sensor to a Raspberry Pi (with a HX711)? Is this possible? I am pretty new to this topic and didn't find sufficient explanation.
0
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1answer
40 views

Power sim900 shield with raspberry pi

I have a SIM900 shield that I want to control with a Raspberry Pi. I want to use GPIO pins on the pi and UART pins on the SIM900 shield. If I understand correctly the numerous tutorials available, ...
0
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0answers
62 views

FFC Flex PCB Flat Connector for Raspberry Pi 3 B+

I have bought a barcode scanner online (promised to be specific for Raspberry Pi 3 with USB interface) but its cable does not have any connector and is just a flat cable with numbers as ...
0
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1answer
55 views

What resistance would I need?

I'm kinda new to PCB design, but here we go: I've created a simple sub-pump water level monitor and it uses a constant 5V from a MOSFET. In the end, it's all monitored by a raspberry pi and I know if ...
0
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1answer
83 views

Raspberry PI Zero - 5VDC output current?

I was planing on using a Raspberry PI Zero W for å smart lamp project with WS2812b LEDs, to avoid separate power supply for the LEDs, my plan was to power the LEDs from +5VDC on the RPI ZW. The lamp ...
0
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1answer
102 views

Is it possible to install `tcpdump` on an Arduino 101?

Currently architecting a side-project idea I have that requires tcpdump on an Arduino 101. This will be my first project and just wondering if this is possible or ...
2
votes
1answer
133 views

Why do my servos break?

I'm messing around with some servos and one by one they stop working. I've got a Raspberry Pi to which I connected a pca9685 servo driver board which in turn connects to 3 of these cheap servos. I ...
0
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1answer
74 views

How to control 4 motors which are conected to a flight controller using Raspberry Pi?

I just started a project to make a drone without a radio controller. I want to control 4 brushless motors connected to a flight controller KK 2.1.5 using Rpi 3 B+. Obviously, the motors are first ...
0
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2answers
45 views

Connecting an Arduino to Raspberry Pi

I'm trying to connect an arduino with 3 sg92r servo motors on it and an RPI with and lcd and the serial of the arduino connected to it. They are both connected to a power supply with 9v/1A and 5v/2....
3
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2answers
86 views

Electronically triggering contact pad buttons on a wired remote with a Raspberry Pi

I would like to control my AC with a Raspberry Pi. My system is similar to this one, although it is an older model from 2004. Currently the system has a wired controller. There is no bluetooth, wifi, ...
1
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1answer
207 views

RaspberryPi driven LED strip is flickering

Supplies: LED Strip Please note I'm trying to power 28 of them. ~1400 mA Power Supply for LEDs 5v/2A Raspberry Pi Breadboard Microcontroller I am following the adafruit for driving LEDs from the pi. ...
2
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1answer
129 views

Splicing 24 awg wires - wire and tool selection

I'm working on a raspberry pi project - a sump pit monitor that sends an emergency email if a float switch above the point where the water triggers the pump is switched (purely for monitoring, not ...
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1answer
89 views

total newbee question : use transistor as a switch

Ok, I don't know anything about transistors, and my knowledge about electronics is basically limited to U = R . I and ...
0
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0answers
32 views

DC biased sine generation using raspberry pi

I'm trying to make a sine wave generator using a Raspberry Pi. I need an sine wave(1Vpp) with user supplied frequency riding on a 4V DC bias. The SoX package seems useful to generate sine waves and ...
0
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3answers
49 views

Limiting the current into Raspberry Pi GPIO pin

I have a dc dc regulator which can output .35A Current at 3.3V. I just need to check that the voltage it is producing is 3.3V by connecting it's output into one of the GPIO pins of Pi. So i was ...
0
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3answers
62 views

Checking how many inputs (reed switches) are active using minimal GPIO pins [duplicate]

I've been a programmer, for a while, but I am new to the hardware aspect of things so I apologize for my lack of knowledge. Just for a fun project to try to get better with hardware, I've decided to ...
0
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1answer
202 views

HDMI to CSI Converter for raspberry pi [closed]

I am creating a HDMI to CSI converter, but i dont know if the wiring is correct and if i need to add any passive component. can you guys help me out? EasyEDA Project
1
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2answers
251 views

Charge and discharge LiPo batteries with BMS 3S

I am looking for a solution to power a Raspberry Pi connected to a LCD screen 10 inch with three LiPo batteries 3.7V 5000mAh connected to two BMS 3S for charge and discharge. I designed the following ...
2
votes
1answer
138 views

Why did C2 fail?

I'm trying to run a Raspberry Pi as a remote controller and timer for a diesel water pump but it keeps rebooting when the engine cranks. I checked and the supply doesn't drop below 10.5V during ...