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Forum Index : Microcontroller and PC projects : Setpin and pin()= problems
| Author | Message | ||||
| Decoy Senior Member  Joined: 02/08/2019 Location: DenmarkPosts: 109 |
Hi guys I have just connected an LED to my UBW32 running MMBasic 4.5C In editor I type: setpin 30, DOUT test: pin(30)=1 pause 1000 pin(30)=0 pause 1000 goto test Now, it seems that the setpin x, DOUT command sets the pin high right away? Also, pin(30)=0 doesn't seem to set the pin low at all, if I just type and run: setpin 30, DOUT pin(30)=0 Any advice? I thought this would remind me more of Arduino-style logic? Thanks! |
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| ceptimus Senior Member Joined: 05/07/2019 Location: United KingdomPosts: 130 |
The pin numbers used by MMBasic are different to the UBW32 numbers. 0 - 20 are the 'standard pins, then D0 to D13 and A0 to A5 for the 'Arduino pins' D0 to D13 have the aliases 21 to 34, so your pin(30) is Maximite pin Arduino D9. Looking at the circuit diagram, this is the pin labelled A7 on the UBW32. You should begin by trying pin 0 (in MMBasic) which will work the UBW32's on board yellow LED. |
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| Decoy Senior Member Joined: 02/08/2019 Location: DenmarkPosts: 109 |
Hi Yes, pin 30 is connected to A7 on the UBW32. Typing setpin 30, DOUT will turn on the pin and set it high right away. Typin pin(30)=0 will not turn it off. pin(0)=1 and 0 works! |
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| ceptimus Senior Member Joined: 05/07/2019 Location: United KingdomPosts: 130 |
How have you got your LED connected? What resistor value? Are you connecting the other pin of the LED to Gnd or 3.3V ? |
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Poppy Guru  Joined: 25/07/2019 Location: GermanyPosts: 486 |
Have you tried: pin(D9)= ... instead ?  Andre ... such a GURU? | ||||
| ceptimus Senior Member Joined: 05/07/2019 Location: United KingdomPosts: 130 |
It works on my UBW32 using pin(30) and the pin labelled A7. I'm using a 1K resistor in line with the LED, other pin to GND. I made a short Youtube video showing the circuit and program. Not brilliant quality but maybe it will help. https://youtu.be/HrcVuXq5jyw |
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| Decoy Senior Member Joined: 02/08/2019 Location: DenmarkPosts: 109 |
Wow, I am amazed that you took the time to do a video!! Thanks for that. I recently left social media, because (in part) I always loved forums I used to frequent back in the day. A response like that video, is a prime example of why old-school forums are awesome. Now for the sad news. From a perspective of complete transparency - I must admit that I messed up big time. I reversed the leads of the LED  I just re-did it, and it works perfectly. Sorry for that!! |
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| ceptimus Senior Member Joined: 05/07/2019 Location: United KingdomPosts: 130 |
 The UBW32 pins (also Arduinos and similar) can source or sink current. So when I wire up a LED to flash and it doesn't work, I just swap the other wire between Gnd and 3.3V.  I normally try to look inside transparent LEDs from the side - they have a little cup connected to one leg and a wire apparently dangling into the cup on the other. I mutter to myself the mantra "C for cup, C for cathode" while doing this! If you've not already mutilated the LEDs legs, then the longer one is usually the one to connect to the positive side. While we're in the spirit of admitting our errors, I was working on my MANIC MINER conversion a couple of days ago. I had one file doing the intro theme, and a separate one playing the actual game. After spending all day making code changes to the game program, I decided to add some chain commands to make each program load the other one. Somehow, and I'm still not sure how, I managed to overwrite the game program with a copy of the intro theme - so losing a whole day's work. I shall be very careful to take multiple backups before adding in any chain commands in future! Edited 2019-08-15 07:03 by ceptimus |
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| Poppy Guru Joined: 25/07/2019 Location: GermanyPosts: 486 |
Still asking ... ... having no UBW32 IŽd like to know if its MMBASIC Version also supports the Arduino Pin-Names? Andre ... such a GURU? | ||||
| ceptimus Senior Member Joined: 05/07/2019 Location: United KingdomPosts: 130 |
It does - MMBasic doesn't know that it's running on a UBW32 - it's exactly the same chip as the one inside a "real" Maximite - and you load that chip with exactly the same version of MMBasic (currently V4.5C). But the pins on the UBW32 are labelled with the PIC32 names instead of the Maximite names - so if your program used pin(D9) that pin would be labelled A7 on the UBW32. It's not at all confusing, really!  See http://geoffg.net/Images/Maximite/SchematicLarge.pngEdited 2019-08-16 02:27 by ceptimus |
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| Poppy Guru Joined: 25/07/2019 Location: GermanyPosts: 486 |
Thanks! Andre ... such a GURU? | ||||
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