OpenEuphoria

2. Re: Raspberry Pi temperature sensors

• Posted by katsmeow Jul 26, 2021
• 1526 views

Wow, i just counted 22 versions of the Raspi on wikipedia. The low end seems to compete with the olde BASIC Stamp, and the priciest seems to compete with the generic mini-itx (plus GPIO pins, minus pci).

The Raspi 3 runs an open source NASA Rover : https://github.com/nasa-jpl/open-source-rover
Or maybe it's a lawn mower. A pinecone picker upper. A tiny garden tractor. A deer watcher.

Either way, Ryan is connecting OE to the real world, the computer can finally know by sunlight if it's 1am or 1pm. Or raining. Or know the water pump is running, but the water isn't moving. Or which chair i am sitting in. Or if the front door is locked, window closed, lights off, and which way the wind is blowing. Or if the car is warmed up or cooled off. Maybe no limit with Phix/OE code on the Raspi.

Kat

4. Re: Raspberry Pi temperature sensors

• Posted by ghaberek (admin) Jul 27, 2021
• 1458 views

I'm not too keen on saying "I did this with Euphoria" only to say "by using system(), etc." it just feels a bit dishonest. Anybody can run another app that does the heavy lifting.

I don't have a sensor handy to test this right now, but you should be able to copy the Bash script near verbatim:

#!/usr/bin/env eui 
 
include std/io.e 
include std/convert.e 
 
-- Read Temperature 
object tempread = read_file( "/sys/bus/w1/devices/10-000802b4ba0e/w1_slave" ) 
 
-- Format 
atom temp = to_number( tempread[match("t=",tempread)+2..$] ) / 1000 
 
-- Output 
printf( STDOUT, "The measured temperature is %0.2f°C\n", temp ) 

Of course, this could do with some better error and type checking, as could the example Bash script.

-Greg

6. Re: Raspberry Pi temperature sensors

• Posted by katsmeow Jul 27, 2021
• 1430 views

I looked at the ESP stuff years ago, and data was not forthcoming, and questions were never answered. On the face of it, the modules look to be wifi interfaces, with no data on how they are to be connected to anything. There's many such Chinese modules, and the web is littered with feedback of them not working as advertised. When people ask for something and get no answers for years, eventually they give up. I gave up. Near as i could tell, OE and Eu were never going to know the position of a toggle switch, let alone control an automated process. And that is disgusting to me, considering the C64 was, for a time, operating the people mover at Hartsfield International Airport, and i patched one into a gigantic Modicon-controlled injection molding machine in 1984. The C64 also made a nice lil HPIB/IEEE-488 controller for Hewlett-Packard and Tektronix equipment. So i may not know modern Chinese stuff because no one answers my questions, but freaking been there done that before they were born.

Making a simple webpage to watch the water tank isn't the same as having smarts out there to handle the gotchas such as the pump running dry for hours, destroying the shaft seal. Or the engine starter motor staying engaged to the flywheel. Or belts coming off at 2am.

The pi can also save events to hdd, so even on a slow connection you can see how that goat got into the cattle trough overnight. I have some hdd that aren't much bigger than the Pi3 in it's plastic case.

The pi can also shut down and wake up periodically, by timer or responce to stimuli, to save power. To me, being smart for the duration of an event beats being stupid all the time.

Rather than giving half-answers from Wikipedia like "use a ESP-xx module" (but not HOW), Ryan is providing a seamless remote many-input many-protocol solution, with a seamless interface using ethernet, wifi, zigbee, 1-wire, 2-wire, I2C, SPI, and an 8-bit parallel. You can write the code on the desktop, upload it to the remote, and run it there. There's many benefits besides "you can write your programs in Euphoria, rather than C", starting with the entire data gathering, distribution, and munging is written in Euphoria (or Phix). Unless you count calling into the OS's API as "dishonest".

Re 3.3v vs 5v, various real-world situations were discussed. Basically, nothing from the user is plugged into the raspi, it all goes thru a card with protective measures. It's not economical to blow up the pi while trying to get an undocumented Chinese module to work with it.

And there's nothing saying the raspi cannot be the gateway to remote zero-power dumb terminals.

Kat

8. Re: Raspberry Pi temperature sensors

• Posted by ghaberek (admin) Jul 29, 2021
• 1383 views

taskkill /IM firefox.exe /F 

Wow that's an impressive jump, Kat. You went from "using system() feels dishonest" to "batch files are bad and Kat is dumb for using them" in one beat, huh? Have you ever heard the phrase, "not even wrong?"

-Greg

10. Re: Raspberry Pi temperature sensors

• Posted by ghaberek (admin) Jul 30, 2021
• 1321 views

And there's the rub. Nothing wrong with using a batch file to do batch file things. But Euphoria can absolutely enumerate and terminate processes using the Windows API. This is the Way.

-Greg

12. Re: Raspberry Pi temperature sensors

• Posted by ChrisB (moderator) Aug 02, 2021
• 1184 views

SO what you're actually saying Kat, is that there really is more than one way to skin a cat! Totally agree, a job done, is a job done.

Cheers

Chris

14. Re: Raspberry Pi temperature sensors

• Posted by ryanj Aug 06, 2021
• 1043 views

It's hard to reply to every comment, so i'll just summarize my thoughts.

There's nothing wrong with using shell scripts, especially on linux, where you can do almost anything at the command line. But, writing a euphoria program to do system calls to run the same commands is useful, because you can feed the output string into a sequence and do stuff with it in a euphoria way. I actually use a bash script to start a euphoria program to do system calls, with pipes to get the results. It works great.

Status update: I have a program on the Raspberry Pi that starts automatically on boot (a cron job) which sets up the 1-wire protocol on one of the GPIO pins, then runs continuously to read the temperature sensors and write the results to a log file in JSON format every 1 minute. Everything is on a shared folder (using Samba), so, i have a program running on my Windows desktop using redylib that reads the log files on the shared folder and displays status with a GUI. It's working great so far, but it still needs some polishing.