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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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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 ...
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2answers
52 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 ...
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1answer
36 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 ...
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1answer
18 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+...
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1answer
40 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 ...
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1answer
30 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 ...
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0answers
35 views

Video transmission using microcontroller [closed]

I try to stream video using a microcontroller. I tried Raspberry and it was expensive and boot time was very slow (which is crucial for my project). I didn't try arduino because I assume it wasn't ...
0
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1answer
34 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 ...
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1answer
32 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
42 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....
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4answers
69 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 ...
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2answers
118 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 ...
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1answer
36 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
37 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 ...
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1answer
83 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
39 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 ...
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0answers
5 views

How to change the SPI clock speed in Raspberry pi zero w [migrated]

Please tell me how to change the SPI clock speed of Raspberry Pi Zero W. Is there any code or settings that i have to change to get my display work. I'm using a ST7735 tft display module (resolution ...
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0answers
29 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.
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1answer
29 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, ...
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0answers
37 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 ...
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0answers
20 views

Raspberry pi a+ vnc connection refused [migrated]

I have a raspberry pi a+ that I am trying to control via RealVNC on my laptop. It worked fine before but now I can only establish a connection via SSH as the connection gets refused. It was working ...
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0answers
31 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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0answers
27 views

Rasberry PI 3 possible OS installations [migrated]

I have installed rasbian OS in a 32 GB memory card and using it in Rasberry pi 3. Is it possible to put ubuntu OS on the same memory card and use it on the RPI 3?
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1answer
69 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 ...
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1answer
58 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 ...
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1answer
103 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
58 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
40 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
83 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
64 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
66 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
81 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 ...
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0answers
27 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
41 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 ...
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3answers
55 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 ...
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1answer
63 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
0
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1answer
31 views

Charge and discharge lipo batterie 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
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1answer
130 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 ...
0
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0answers
56 views

Acquire a “TIC” signal from a power meter

I'm trying to acquire the tic signal of a french power meter. From the datasheet available here of the TIC signal we can find out that the signal is (page 7/38): 6 Vrms +/- 10% at 50 kHz It comes ...
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1answer
76 views

What makes a microcontroller development board powerful?

I'm seeing an awful lot of dev boards on the internet that arent Raspberry Pis or Arduinos and I'd like to know what makes a board powerful? Whats the difference between a board that may be used in a ...
0
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1answer
37 views

How to power two motor drivers and Raspberry Pi with one LiPo battery?

apologies in advance for the lengthy question. I'm working on creating a remote controlled rover. It is controlled by a raspberry pi, and driven by two MDD10A REV2.0 motor drivers (one for the left ...
0
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0answers
61 views

Component that returns GUID when connected to two pins of a microcontroller

I am looking for the name or concept of a component that can identify itself when connected to a micro-controller like the Raspberry Pi. The component would be embedded into an object, so it should ...
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4answers
127 views

Controlling 12V Magnetic Latch Solenoid with RaspberryPi 3b

As the title says I am trying to control a solenoid with a raspberry pi. I am currently using an npn transistor (will post link with parts at the bottom) however I am having a hard time getting it to ...
1
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1answer
77 views

Getting weird resitance drops with an FSR and a raspi using a MCP30

I tried to create a weight detecting device, that detects when a heavy objects are placed on a table. Its supposed to work like this: The raspi keeps checking the recistance on the force sensing ...
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1answer
41 views

Circuit for high voltage pulses using raspberry pi PWM to drive a piezoelectric actuator

I am trying to engineer a device to separate red blood cells from blood plasma in 100mmx1mm capillary tubes using the raspberry pi GPIO pin PWM feature and a piezoelectric actuator. The pulses ...
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2answers
48 views

L298N H-Bridge : Powering 4 motors using (6) aa batteries vs (4) aa [closed]

I am currently wiring up my raspberry pi, H-Bridge and (4) 3-6v ratting motors. My question is, how will performance change based on me using 6 or 4 batteries to power motors? I noticed some tutorials ...
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2answers
49 views

A GPIO pin opening/closing a high power circuit?

sorry if this a very beginner question but I'm still quite new to the field of electronics generally. I have a requirement to connect a Raspberry Pi to an existing electronic lock, and hopefully use ...
2
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0answers
63 views

Arduino-like microcontroller with more ram for image processing [closed]

I want to build a device to perform image acquisition and processing, but I don't know which kind of board/microcontroller to use. My idea is to use a low-res camera, take a shot, analyze it and ...
0
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2answers
38 views

Pcf8574ap to to manage the 4 address pins of 4067 multiplexer?

I have a question. I have a 4067 multiplexer connected to my Raspberry Pi, 4 GPIOs turned on or off, control the channel of the multiplexer. My problem is that if no channel is changed, my code is ...