Raspberry Pi Forums

rhinotekmn

I have done some googling in an attempt to find a GPIO "expander", I am coming up with things like MCP230XX but that seems to be designed for the Pi 1. I am looking for an expander that will give me pins 41 and beyond(in total I need 65 unique [i.e. not a multiplexer] generic I/O pins) fo...

rhinotekmn

I have done some googling in an attempt to find a GPIO "expander", I am coming up with things like MCP230XX but that seems to be designed for the Pi 1. I am looking for an expander that will give me pins 41 and beyond(in total I need 65 unique [i.e. not a multiplexer] generic I/O pins) for...

rhinotekmn

SOLUTION FOUND!!! Thanks to all contributors. Here is the code for posterity and future inquiries... import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) GPIO.setwarnings(False) GPIO.setup(xa1,GPIO.OUT) GPIO.setup(xa2.GPIO.OUT) GPIO.setup(xV,GPIO.IN, pull_up_down=GPIO.PUD_DOWN) while True: if ...

rhinotekmn

in terminal I type sudo python test.py and the LED's switch on and off by themselves without voltage being present. Sound like you are missing a pull-down ( internal or external ) which keeps the pin reading low when no voltage is applied to pin 21. So from sourceforge GPIO.setup(channel, GPIO.IN, ...

rhinotekmn

while True: if GPIO.input(21): GPIO.output(18,GPIO.HIGH) GPIO.output(17,GPIO.LOW) else: GPIO.output(17,GPIO.HIGH) GPIO.output(18,GPIO.LOW) time.sleep(0.1) time.sleep(0.1) is used to reduce the CPU load. Without it the loop will push one CPU to 100%. PeterO Oddly, that didn't seem to do the trick. H...

rhinotekmn

PeterO wrote: ↑
Thu Apr 12, 2018 6:44 pm
You need to put your code into a "while True:" loop if you want it to continuously check the state of the input pin.

PeterO

Should I put "while true" before, or after declaring my variable?

rhinotekmn

var1=GPIO.input(21) if var1: ##This will happen if var1 == true GPIO.output(18,GPIO.HIGH) else: ## This will happen if var1 is false GPIO.output(17,GPIO.HIGH) As documented at https://sourceforge.net/p/raspberry-gpio-python/wiki/Inputs/ So after doing the above(I also added the code from hippy), I ...

rhinotekmn

So I am trying to trigger an if/else when voltage is present on GPIO pin 21. What I have so far... import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) GPIO.setwarnings(False) GPIO.setup(18,GPIO.OUT) GPIO.setup(17,GPIO.OUT) GPIO.setup(21,GPIO.IN) var1=GPIO.input(21,GPIO.HIGH) if var1: GPIO.out...

rhinotekmn

Any ideas on the python script? And Can I use any of the IO pins or are there ones designated as inputs? Maybe you missed my earlier reply? Repeated here - For the coding aspect of your query, the gpiozero python library module (installed by default with the Raspbian Operating System) has built-in ...

rhinotekmn

That you can do. Just wait until the input pin changes to high, then change your output. Though you do know you can do that with only a resistor, an LED, and a power source, correct? No need for a Raspberry Pi in the middle. Now going from red to green will require the addition of a pull-down trans...

rhinotekmn

And that is OK. I just want 2 states. So if there is voltage (any voltage) on pin x then change GPIO 18 from high to Low and GPIO 17 from low to high. It may not be as simple as you hope. "Any voltage' may not necessarily be interpreted as High - there is a minimum trigger level that has to be...

rhinotekmn

And that is OK. I just want 2 states. So if there is voltage (any voltage) on pin x then change GPIO 18 from high to Low and GPIO 17 from low to high.

rhinotekmn

First, how (if at all) can use a GPIO pin to monitor for voltage coming in? Next, My coding skills are beginner/intermediate. If I have a 2 color LED: Green Anode on pin 17, Red Anode on pin 18, Cathode on Pin 6. The goal here is; IF voltage is found on pin x; GPIO.output(18,GPIO.LOW) GPIO.output(17...

rhinotekmn

So I have a project I would like to try but I am not sure if it will work. I would like to communicate via wifi to a Raspberry Pi. I would then have a built IR transmitter connected in front of my RF controlled device. Essentially I want to be able to turn on and control my home sound system from an...

rhinotekmn

So everything I am reading seems to imply that the ARMv8 64 Bit Chip can run Windows 8. Has anyone tried this yet? Was it successful?

rhinotekmn

That is what i was hoping for ghans. Thank you!

rhinotekmn

Hello all, I am working on a project that requires some background information. I have an application only available for Windows in .exe format. The app is used to load firmware to a peripheral device, which stores the firmware on flash form memory, via USB. If I set up a Windows PC and run this app...

rhinotekmn

Can fd32 be installed on rpi? Or better yet is there a step by step all in one place instructable for installung winXp via wine on raspbian?

rhinotekmn

It is a program for my company and it was only built as .exe, so there isn't an equivalent. However, I remember hearing that Pi can run WinCE 6.0 which I believe can run the application. Is this a viable option?

rhinotekmn

Hello, I have no experience with Raspbian yet, only XBMX. I am trying to download .exe on a pi OS, I'm not even sure that Raspbian is the best option. Anyway, I want to run a program built for Windows XP. It doesn't matter how I do it, or even if the GUI is pretty because this will be the only Appli...

Search found 20 matches

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Re: GPIO input voltage and Python script help

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