All Questions
11 questions
3
votes
1
answer
1k
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 ...
- 43
-3
votes
2
answers
139
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 ...
- 121
1
vote
1
answer
752
views
How can I use Garage Door Safety Sensors with Raspberry Pi?
I am trying to use garage door safety sensors as a way of counting cars. From my understanding, if there is no object (car) between the sensors, then they output a 3.3V signal every 6 milliseconds. If ...
- 11
0
votes
2
answers
623
views
When to set internal pin resistance at software layer
I'm trying to wire my Raspbery Pi 1 Model A (hereafter RPi) to a simple 6VDC buzzer and here is my best attempt:
So the 3.3V power pin from the RPi is connected to the breadboard's top-most rail via ...
- 645
0
votes
1
answer
1k
views
Is wiringPiSetup BCM or BOARD?
I am using WiringPi to simulate PWM output to my GPIO pins. My problem is that I converted from the regular Rpi.GPIO library to WiringPi. I used BCM as GPIO mode but now WiringPi uses BOARD. How can I ...
- 105
2
votes
1
answer
9k
views
Wiring a 3 pin toggle switch to Raspberry Pi 3
I have this small 3 pin toggle switch - just toggles left and right - it has its three pins aligned left, center and right. No datasheet for it - not sure where it came from - most likely a starter ...
- 381
1
vote
0
answers
74
views
WiringPi traffic light in C [duplicate]
I am working on a project for my C programming class and need to use wiringPi on my raspberryPi. I need to create a traffic light (like a real one- red to green to yellow to red, etc.) and a ...
- 11
-1
votes
3
answers
1k
views
pwm fan on pin 18 help!
Can someone help me? I'm trying to control a fan using PWM and I cannot work out how to do it. This worked for a short amount of time and then stopped working.
According to the docs, GPIO pin 18 ...
1
vote
1
answer
158
views
AdaFruit PiPlate(LCD+Keys) + PWM port + DS18B20 temp sensor
I would like to know if it is possible to use at the same time, the Adafruit LCD+Keys + the PWM port(to control a MOSFET) + one temperature sensor (DS18B20) and its oneWire protocol?
I was concerned ...
- 293
0
votes
1
answer
2k
views
wiringPiSetupSys - input pin state does not change
I try to port my GPIO project from quick2wire to WiringPi. My aim is to read the state of a photocell connected to pin 24 of my raspberry pi (model B, revision 2).
My code (python 3) looks like this:
...
- 133
1
vote
1
answer
58
views
Logic State non-responsive
I need the raspberry Pi to respond to some buttons. I'm writing this in Pure C, using the wiringPi library. As such, I thought it prudent to use the gpio utlitily to make sure my pins were sane ...
- 139