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Forum Index : Microcontroller and PC projects : Logging data
| Author | Message | ||||
| Benzol Regular Member  Joined: 07/01/2015 Location: AustraliaPosts: 64 |
Has anyone used a micromite for logging data? I want to record temperatures on a regular basis (every 60 mins) using a DS18B20 as a precursor to another project but unsure how. I thought using a thermal printer may be a possibility but I want some long term data so it needs an electronic log. Thanks |
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palcal Guru  Joined: 12/10/2011 Location: AustraliaPosts: 1982 |
Log it onto an SD card. You could then put the card in your PC and do whatever. Paul. "It is better to be ignorant and ask a stupid question than to be plain Stupid and not ask at all" |
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Grogster Admin Group  Joined: 31/12/2012 Location: New ZealandPosts: 9584 |
Agreed. Smoke makes things work. When the smoke gets out, it stops! |
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| matherp Guru Joined: 11/12/2012 Location: United KingdomPosts: 10180 |
For a Micromite use an "Openlog" or this code (NB not retested on 5.1 - pleae could somebody let me know if there are any issues). The Micromite+ handles the SDcard direct |
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| Benzol Regular Member Joined: 07/01/2015 Location: AustraliaPosts: 64 |
Thanks matherp. There is a lot of information there and if I can use my newby status to ask what may seem basic questions. The top photo shows a ILI9341 with a SD card inserted. Can just a SD card socket be used stand-alone for logging or is it easier to use the integrated unit? My programming skills do not give me enough of an understanding of your code but if I may summarise what I think is required. Your most recent code allows usage of the standard SPI pins but that is code to display the picture. I can use your original log demo "2015-12-02_194820_logdemo.zip" if I am using just a SD card socket. I'm starting to think I'm well out of my depth here but I suppose it is the only way to learn. thanks |
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| VK2MCT Senior Member  Joined: 30/03/2012 Location: AustraliaPosts: 120 |
I think we need a bigger idea of whatyou plan. What do you intend to do with the temperature data ? What power supply is available ? How much space ? How accurate does each sample need to be time wise ? date wise ? What operational interface is OK? keyboard / size screen ? Is it a set and forget solution you are after ? Does it matter if logger crashes ? Why not an available 'built' commercial system? Some solutions (maximite ?) have an SD card carrier already built onto circuit card & the commands to access the card 'built-in'. Bye, John B |
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| Benzol Regular Member Joined: 07/01/2015 Location: AustraliaPosts: 64 |
Hi John The long version; it's getting hotter in Perth and for longer in summer. My plan is to build microprocessor controlled roof space vents with Fan assist. I already have a home built 12v solar system with 250Ah capacity so 12v power is not a problem. I can build the roof vents with actuator controlled seals to keep the heat in during Winter. The idea of logging data was to learn more about the micromite but also measure temperatures in the roof space and then determine best temperatures to turn on and off the fans. Space is not a problem. I intended to log hourly temperatures, just a simple date/time stamp and the corresponding temperature. I have considered a commercial unit as a controller but that's not the way to learn. thanks db |
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| VK2MCT Senior Member Joined: 30/03/2012 Location: AustraliaPosts: 120 |
Questions, questions ? How many inputs to the controller do you need? 1 or more temp measures ? day or night sensing ? outputs from controller ? temp in some form ? turning fans on/off/variable speed? control of actuators ? Just trying to start with hardware which will suit your endpoint. John. |
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| Grogster Admin Group Joined: 31/12/2012 Location: New ZealandPosts: 9584 |
There is always EEPROM or FRAM memory chips on the I2C or SPI bus too, depending on how you want to access your data. SD cards give nice easy compatibility with a PC or MAC for reading that data, but if you are only interested in being able to read back the data on the unit you have, then an LCD of some description and an EEPROM or FRAM memory chip would do that job nicely. Smoke makes things work. When the smoke gets out, it stops! |
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Zonker Guru Joined: 18/08/2012 Location: United StatesPosts: 767 |
Another idea to consider Benzol, is saving your data records in "CSV" format... That way, when you want to review the data, you could import it into the Microsoft Excel program and create time/temp data charts with it...  |
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| Benzol Regular Member Joined: 07/01/2015 Location: AustraliaPosts: 64 |
Hi All I really appreciate the feedback and comments. In order; I think only a single temp sensor will be needed for both the data collection and the final controller. The data logging and collection is just to determine most suitable on and off temperatures. Output from the controller will be via a 5v relay driven directly from the micromite, something I have already done with my lighting system. That can then drive the 12v system with 12v automotive fans. These are cheap as on Ebay and come in a multitude of sizes. Just need to turn on or off, variable is not needed. I don't need day / night, temperature is the main driver. There are a quite a few existing roof space vents around, like the ones with the whirly thing on top. Insert a suitable diameter fan in the tube with a plate inside much like a butterfly valve on a carburetor. I have automotive door lock actuators that i can use to open and close the plate. I can use the micro to open the plates a second or two before the fan comes on to ensure it is fully open. CSV would be great, I love data analysis. The data logging is really the only problem I have, the controller side of things is all good. Cheers everyone. |
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panky Guru Joined: 02/10/2012 Location: AustraliaPosts: 1114 |
Hi Benzol, I would recommend the Circuitgizmos Microboard which uses the 470 chip and includes a micro SD card socket. MMBasic 5.1 includes file manipulation routines on the 470 and also, if you need them, extensive graphic manipulation commands to use with a variety of displays. I wrote a program some years ago to display battery information for my caravan that included data logging in csv format to an sd card (it was on a cg colormaximite) but it should port easily to the 470 and 5.1. If you want, I can post a copy of the logging code for you or have a look in the library for batmon.bas Cheers, Doug. ... almost all of the Maximites, the MicromMites, the MM Extremes, the ArmMites, the PicoMite and loving it! |
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| Benzol Regular Member Joined: 07/01/2015 Location: AustraliaPosts: 64 |
Hi Doug Thanks for the guidance and pointing to your CVBM code. It looks really good and I'm sure I can get it to do what I want. Plus, I can use it to monitor my solar system when i really start putting a load on it. Most appreciated. Dave |
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| Lightrock Newbie  Joined: 19/05/2014 Location: AustraliaPosts: 26 |
@matherp Tested you code on a 44 pin Micromite running V5.1. Displayed the Tiger2 picture with no problems. Now to learn how to log data to the SD card. Thanks for all you efforts. Roy |
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