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Forum Index : Microcontroller and PC projects : E-28 distance & microtiming
| Author | Message | ||||
| Alastair Senior Member  Joined: 03/04/2017 Location: AustraliaPosts: 161 |
I have built a number of projects using the MM+ backpack and E-100 and found them excellent. Recently I had a small project which was part of a larger group of modules logging data and now sending them to a MM+BP base station. I was going to use a MM+ module but decided it was overkill and tried an E-28 from RicTech "across the pond". What a great little board.  The E-28 logs data from 6 sensors connected to various parts of my solar HW system + the time and then sends it to the base MM+ via HC-12 when instructed. The base will also poll 2 other stations on different channels. Have tested it and it works after some fiddle - mainly giving the HC-12 plenty of time after switching channels. I decided to add an ultrasonic module to measure the water depth in my rainwater tanks. I rearranged the pin usage and ended up with 2 available for the u/s sensor - every pin now used. Went to modify the s/w and found the distance command is not available on the E-28. The standard timing is in milliseconds and since I need to measure times around 2 to 12 msec (full to empty) I am not going to get much precision. Rather than start a journey of discovery as to how to access the cpu clock to get microsecond timing, I decided to ask here rather than do my normal approach of spending days on what I am sure has already been done by others. So - what is the best way to get finer timing or does someone have a Csub implementation of the distance command that I can put in the library? cheers Cheers, Alastair |
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jman Guru  Joined: 12/06/2011 Location: New ZealandPosts: 711 |
Hi The distance command is availble as CFunction. There is PDF called Distance.pdf in the embedded C Modules folder of the firmware download. Regards Jman |
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| Alastair Senior Member Joined: 03/04/2017 Location: AustraliaPosts: 161 |
Jman, well there you go. I never did look at all the stuff that was in the download just the hex I needed. Lots of you clever folks 'across the pond' Thank you Cheers, Alastair |
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| Alastair Senior Member Joined: 03/04/2017 Location: AustraliaPosts: 161 |
Brilliant - it works just like a bought one. Hours saved just by asking. thanks Cheers, Alastair |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9083 |
To be fair, it was Robert Rozee's idea, I just helped him with the board layout. His idea to do it that way, make it that small, and have the features it has. Just to make sure credit is directed to him, as the E28 was his puppy, really.  Smoke makes things work. When the smoke gets out, it stops! |
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| lizby Guru Joined: 17/05/2016 Location: United StatesPosts: 3027 |
To quote T.S. Eliot, "Between the idea And the reality, Between the motion And the act Falls the Shadow" (or in this case, perhaps "Rises the Smoke"). Kudos to both for the great idea and implementation. PicoMite, Armmite F4, SensorKits, MMBasic Hardware, Games, etc. on fruitoftheshed |
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GoodToGo! Senior Member Joined: 23/04/2017 Location: AustraliaPosts: 188 |
Hey Grogs, do you have any of the -1A's left? Cheers, GTG!  ...... Don't worry mate, it'll be GoodToGo! |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9083 |
If you mean the QFN ones, no. I might be able to find my test unit, but I don't have any pre assembled 1A's, as the QFN idea was dropped pretty quickly! I probably have 1A PCB's left if you were REALLy keen.  Smoke makes things work. When the smoke gets out, it stops! |
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| GoodToGo! Senior Member Joined: 23/04/2017 Location: AustraliaPosts: 188 |
PM coming your way! GTG! ...... Don't worry mate, it'll be GoodToGo! |
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