Questions tagged [wiring]

Items referring to physical wiring. For question to the wiringPi library use the tag wiringPi.

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DS18B20 randomly dissapear from the devices list

I have 4 DS18B20 sensors connected to a Raspberry Pi 4, with a resistor of 10kOhm. All of the sensors randomly disappears from the w1/devices. In config.txt the dtoverlay=w1-gpio as well as the ...
2 votes
0 answers
34 views

Moisture sensor gives weird results when connected to a relay

I was about to review the items as faulty when I connected my brain and made a second test. The sensor is supposed to return 0 when dry and 1 when wet. In my script I repeat the reading 100 times. I ...
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1 answer
44 views

Trying to get my curcuit board running

I am trying to create a curcuit board for a project of mine. Several devices are connected to a Raspberry Pi Zero 2 W. One of them is not working via the curcuit board but directly connected to a ...
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41 views

Raspberry Pi direct wiring connection problem

I wrote some code to activate a video when a motion sensor detects movement. So far everything works while everything is wired to the breadboard. When I connect my motion sensor to the Pi itself, it ...
1 vote
2 answers
153 views

GPIO Button Wiring

Edited: Question re-written Hello, So I am looking to build a system that will have around 400-500 input buttons. These buttons are basically used to select an option so only 1 button will ever be ...
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1 vote
1 answer
59 views

What's the best to control a motorized valve: 2 or 3 wires command?

I need to control a bi-stable motorized valve. I hesitate between two types of wiring: Inverse polarity of 2 wires to open or close: I can do it with two coupled relays. Does it hurt to do it with ...
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0 votes
0 answers
37 views

Using Temp Sensor to Control Mains Water Valve

I have a complicated use case that I'm hoping to solve work a RaspberPi. I need to control a valve that turns on mains water from city service when a temperature sensor reaches the max allowable limit ...
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0 answers
40 views

How to power this LED array

I have this infra-red LED array that I took from an old game camera. I would like to be able to incorporate this into a Raspberry Pi project (home security camera). Specifically I would like to turn ...
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0 votes
1 answer
190 views

Wiring an Omron Thermal Printer to a Pi Pico

I'm trying to connect an old Omron thermal printer (PRT-1 Z, companion of the 705CP Blood Pressure Monitor) to a Raspberry Pi Pico. The idea is being able to print something using the Pico. The ...
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3 votes
1 answer
345 views

Wiegand wiring guidance on Pi 4 with voltage step-down

Ok so following on from my previous post here. I have decided to start with the Wiegand wiring interface. I've drawn a diagram below to illustrate how I plan to wire everything up. Would appreciate if ...
0 votes
2 answers
39 views

Should indicator LED's be wired in Series with active GPIO driving pins or on their own GPIO pins

I'm building a fairly complex Raspberry Pi project that includes several sensors and driver motors for a garden automation system. Ideally, I'd like to have LED's that indicate the status of sensors/...
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0 votes
1 answer
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What is the name and specs for the RPi CM 4's GPIO connectors?

I want to use a compute module for a personal project; but I don't know the name of the connector that is used for the GPIO/SPI etc. It is the one pictured here In the spec sheets, I see the pin out ...
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1 answer
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Wiring multiple I2C sensors to Raspberry Pi using breadboard or wiring

I am new in prototyping with Raspberry Pi. I am using a Raspberry Pi 4B. For a project I want to connect 3 I2C sensors to it (AS7262,BME688 and AS7263. They connect to the same pinns (pins 1, 3, 5, 6, ...
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5 votes
1 answer
1k views

Sainsmart 12V, 16 Channel relay module connected to RpiZW has unwanted triggering when booting

I'm trying to get the hydrosys4 open source irrigation control software to work with my 16 channel relay board and raspberry pi zero w. When the pi boots up the relay is triggered multiple times, ...
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0 votes
2 answers
2k views

What "wiring" pin numbers on Pi Zero pinout diagram mean

On the below diagram I understand what position (on the board), GPIO (abstract Pi GPIO numbers) and BCM (SoC pin numbers) pin numbers mean, but what's the meaning of the "wiring"?
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1 answer
103 views

Flow meter circuit and low pulse count

simulate this circuit – Schematic created using CircuitLab I have a very simple circuit that uses a hall effect sensor to measure water flow which then in turn sends pulses to GPIO 13 on my PI. ...
1 vote
1 answer
87 views

Proximity sensor reads not working

I'm trying to read output from NPN proximity sensor: but from the GPIO pin I don't read any state change: unfortunately I can't read anything from it cause it seems to fluctuate even if I set the pull ...
1 vote
4 answers
2k views

Using single 5V relay module (jqc-3ff-s-z) - Asking for help

I have a developer background missing the electronics background. I read some threads with great interest: Using single 5V relay (jqc-3ff-s-z) - safety advice required and 5V relay (jqc-3ff-s-z) I ...
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1 vote
0 answers
94 views

making a DC motor spin both ways

I week ago, I got my raspberry pi, connected it to a DC motor, and made the DC motor spin using python. now, I'm trying to get the motor spinning both ways. I have tried but failed. What is the best ...
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1 vote
1 answer
69 views

how to wire up a 12V solenoid valve without alligator clips [closed]

I have got a very beginner question. I am building an irrigation system and so I need to use a 12V solenoid valve. My question is as follows: Given the following valve and in particular the contacts (...
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0 votes
2 answers
475 views

coin acceptor location instability (electricity)

i'm a software developer and a noob in electronics. I've built a photobooth for a friend of mine that runs by an ice cream stand. The wiring is like this; Coin acceptor | --> signal --> voltage ...
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ST7789 Display on Raspberry PI 3

I just got an ST7789 240x240 display and i can't get it to work with my PI. i'm using this library: https://github.com/DjamesSuhanko/Python_ST7789 i installed all the python dependency's When i ...
2 votes
1 answer
128 views

Raspberry Pi GPIO and Relay Newbie Learning Problem

I'm a beginner with electrical circuits right now, so I apologize if this might sound a little riduclous. Let's say if I have a switch device that's controlled by two wires. Can I use a Raspberry Pi ...
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0 votes
1 answer
707 views

GPIO Output Pin Reverse Current/Higher Voltage

I have a device with a built in voltage divider and opto-isolator. I need to send a pulse to from the RPi GPIO output to the input pin in the circuit. The output from the optic-isolator goes to an ...
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1 vote
1 answer
74 views

Is this the correct way to connect this set of components (gardening application)

The project is one where I want to monitor and log Soil pH Soil moisture Room Temp Room Humidity Shown in the diagram are: Capacitive soil moisture detector 3.3-5.5V link ADC1115 to convert soil ...
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1 vote
1 answer
505 views

Is it safe to use 3V3 on raspberry pi 3B+ to control a 3V DC motor?

I want to connect power to a 3V DC motor straight from 3v3 GPIO. Is it safe or will I brick my Pi 3B+ ?
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1 vote
0 answers
897 views

RPi.GPIO + single channel relay + solenoid lock

I'm working on my first python/hardware project and I want to create a simple (or at least I thought it was simple) cabinet lock, which will lock/unlock when certain RFID tags are approached to the ...
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1 vote
0 answers
61 views

128x64 LCD install to Pi Zero W

This is my first Rasp project, so please be understanding. I have Raspberry Pi Zero W and 128*64 dot china LCD. I do not have any program done for the screen yet. When start my Rasp only backlight ...
3 votes
1 answer
56 views

Need Help with Controlling Some LEDs with a Raspberry Pi

I'm mainly trying to follow this guide here in order to connect some LEDs to a Raspberry Pi. I've read other guides as well, but this link is where I got the majority of my setup done. I've never used ...
2 votes
0 answers
214 views

(Wiring) RPi 4B laptop keyboard

NOTE: Not that I've chosen a few wired keyboards, I'll accept an answer that explains HOW to (easily) wire a keybard to the pi - it cannot obstruct the use of a small fan powered by the GPIO. I'm ...
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0 votes
1 answer
293 views

Need help powering a raspberry pi thermostat using 24v power from the unit. I have it working plugged in usb

I have a raspberry pi thermostat that is plugged in through USB. Dealing with this voltage I don't want to "try and see what happens". My current setup is the Pi is powering the relay module through ...
1 vote
1 answer
644 views

Wiring GPIO pins to press hardware button on USB MOUSE

i have soldered out buttons and replaced them with wired in USB mouse. Mouse itself is connected to device. Is it possible to wire those cables to GPIO in Raspberry PI model 2. And control clicks via ...
1 vote
1 answer
124 views

How can I get the image recorded from a rear-view camera?

I have a rear-view camera (NAVITEL MR250) which I use everyday. I got into image processing and I thought a good personal project would be to create a "self-driving car" (Quotation marks because I ...
2 votes
2 answers
111 views

Can I safely add a switch between a fan connected to power/ground?

I've just got a small 5V fan for my Pi, but it is very loud, and I'd like to be able to switch it on/off. Currently, the fan is just wired to 5V power and ground. I know that I can use the GPIO pins ...
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2 votes
2 answers
4k views

Rpi GPIO Controlling 5V Relay Problem

I am working on a project that requires a camera analyzing some images and activating the appropriate GPIOs to control a relay board. I currently have a touchscreen display, a Raspberry Pi Cam ...
3 votes
2 answers
6k views

Rpi to Arduino Serial UART Communication Tutorial

I'm trying to connect my Arduino to my Raspberry Pi using the GPIO pins. I understand that the Pi uses a 3.3V signal while the Arduino uses a 5V signal so I bought a bi-directional logic level ...
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0 votes
0 answers
194 views

Multiple SDA/SCL | Getting 16x32 RGB LED to work with MCP23017?

I am close to completing a device which will have a 16x32 led matrix as well as quite a few lights/buttons/sensors. All these lights and sensors go through an MCP23017. I am using the Adafruit led ...
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0 votes
0 answers
32 views

Motor-Potientiometer read and write, additional power source

I want to get and set values for a motor potentioneter ALPS RK16812MG from a raspberry pi. I found a similar approach here however, the answers in that forum suggest a different wiring with an ...
1 vote
0 answers
630 views

Connecting Raspberry Pi to old found TFT display

I have an old car DVD player sitting around that has a fairly decent secondary TFT LCD screen (hannstar 721h440b19-a1) that I thought I could use with my Raspberry Pi 3 Model B. I opened up the unit,...
7 votes
1 answer
670 views

How can I wire a Raspberry Pi to an 8-relay board in a tidy professional manner?

I want to connect a Raspberry Pi to an 8-relay board, such as this one. Together with ground and power this amounts to ten wires. One option to connect the two is by using female to female jumper ...
0 votes
1 answer
156 views

DS18B20 device not showing

Things I've tried: Replacing the DS18B20 twice (First one was a different brand than the other 2) Using: modprobe -r -a w1 w1-therm modprobe w1 pullup=1 modprobe w1-therm strong_pullup=1 Checking ...
7 votes
2 answers
857 views

Creating jumper leads from ethernet cables - connect multiple components

I've bought some crimpers and a dupont connection kit and I'm planning on reusing some old cat5 ethernet cables I have. Is it reasonable to connect two devices to the RPi via the 8 wires in the cat5 ...
1 vote
2 answers
1k views

How to use Solenoid Lock 12V DC

I'm new to this, and I can't see how to control a solenoid lock using raspberry (The wirings). I have an 8x AA Battery pack which is wired to output 12V. I don't know where to connect the black and ...
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0 votes
1 answer
348 views

Controlling button on YwRobot with Raspberry Pi

I am obviously new to Raspberry and Stack, but would be great if community can advice. My setup is the following: - YwRobot 545043 power supply (controller) connected to the breadboard and to the ...
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2 votes
2 answers
834 views

Do I need a resistor to wire my Pi Zero directly to a power source?

I want to connect my Pi Zero directly to a 5V 10amp power adapter (shown below) which in turn connects to a wall outlet. I know that with LEDs you can't just connect it directly to the power source ...
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-1 votes
2 answers
273 views

How to connect more I2C sensors on top of a RPI shield

I'm struggling with a problem, how to connect more sensors on top of this raspberry shield => https://sixfab.com/product/raspberry-pi-nb-iot-shield/ The shields schematic can be found here and it ...
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0 votes
1 answer
690 views

How to wire up a LED Matrix with a Raspberry PI

I'm not sure how to wire up the LED Matrix corrctly. I followed the steps in this guide: https://github.com/hzeller/rpi-rgb-led-matrix/blob/master/wiring.md In this tutorial the matrix has 3 GND pins. ...
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0 votes
2 answers
3k views

Correct wiring for multiple analogue sensors?

I’ve recently embarked upon a project that I’ve wanted to do for a while. My overall plan is to have 3 planting shelves; each will have its own soil moisture sensor, water pipe and LED lighting. The ...
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-3 votes
2 answers
117 views

Can somebody please tell me how to wire this?

I litterally cannot find it anywhere on how to wire this https://www.adafruit.com/product/2934 The only thing any of the pigrrl schematics show is connecting wires from b1,2,3,4 to pins on another ...
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2 votes
1 answer
2k views

How to wire an HC-SR04 without a breadboard?

I have a Raspberry Pi and a HC-SR04 integrated circuit for measuring distance. I have found many resources for how to connect the HC-SR04 to the GPIO of the Raspberry Pi, but because the HC-SR04 ...
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