Nov-29-2022, 07:41 PM
Greetings,
I am having the hardest time trying to find a good sample code to start expanding my GPIOs on my Raspberry Pi 4. The problem is I am not making letters or symbols, I am trying to independently turn on/off individual outputs with different hooks. I have searched for 3 weeks now, and I haven't found anything that I can expound on. I have tried many libraries, but the code always says something or another isn't defined. I have updated just about everything and I don't know what to look for anymore. I don't have any code to post because I haven't gotten anything to work.
Can I ask for some help?
I can go either way, either MCP23017, or Arduino Mega. Can someone share a sample code that will show me some sign of life? Lets start simple. Can I see, say 8 LEDs (Outputs) cascading in a loop so I can see how to target the GPOs? If it's Arduino, obviously that gives me over 50 outputs, so it would just be a matter of targeting the right pin. If its the MCP23017, then how do you address outputs on multiple boards? I know about addressing, but I am not sure how to direct the code to talk to the right target. It seems that I missed the boat. Most things that are written for this is 10 years old. I should also say, I don't want to use the USB to talk to Arduino. I'd like to stay on i2c.
This is just to get the conversation started, so if I am vague about something, then I can answer some more questions, but I'm not sure what is relevant at this point. Also, I'm not good at running programs from a terminal, so I use Thonny to write and run things.
I am having the hardest time trying to find a good sample code to start expanding my GPIOs on my Raspberry Pi 4. The problem is I am not making letters or symbols, I am trying to independently turn on/off individual outputs with different hooks. I have searched for 3 weeks now, and I haven't found anything that I can expound on. I have tried many libraries, but the code always says something or another isn't defined. I have updated just about everything and I don't know what to look for anymore. I don't have any code to post because I haven't gotten anything to work.
Can I ask for some help?
I can go either way, either MCP23017, or Arduino Mega. Can someone share a sample code that will show me some sign of life? Lets start simple. Can I see, say 8 LEDs (Outputs) cascading in a loop so I can see how to target the GPOs? If it's Arduino, obviously that gives me over 50 outputs, so it would just be a matter of targeting the right pin. If its the MCP23017, then how do you address outputs on multiple boards? I know about addressing, but I am not sure how to direct the code to talk to the right target. It seems that I missed the boat. Most things that are written for this is 10 years old. I should also say, I don't want to use the USB to talk to Arduino. I'd like to stay on i2c.
This is just to get the conversation started, so if I am vague about something, then I can answer some more questions, but I'm not sure what is relevant at this point. Also, I'm not good at running programs from a terminal, so I use Thonny to write and run things.
