describing the handling of a SD-card
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README.md
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README.md
@ -60,6 +60,7 @@ Depending on board hardware following features are supported:
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- IF482 (serial) and DCF77 (gpio) time telegram generator
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- IF482 (serial) and DCF77 (gpio) time telegram generator
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- Switch external power / battery
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- Switch external power / battery
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- LED Matrix display (similar to [this 64x16 model](https://www.instructables.com/id/64x16-RED-LED-Marquee/), can be ordered on [Aliexpress](https://www.aliexpress.com/item/P3-75-dot-matrix-led-module-3-75mm-high-clear-top1-for-text-display-304-60mm/32616683948.html))
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- LED Matrix display (similar to [this 64x16 model](https://www.instructables.com/id/64x16-RED-LED-Marquee/), can be ordered on [Aliexpress](https://www.aliexpress.com/item/P3-75-dot-matrix-led-module-3-75mm-high-clear-top1-for-text-display-304-60mm/32616683948.html))
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- SD-card (see section SD-card here)
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Target platform must be selected in [platformio.ini](https://github.com/cyberman54/ESP32-Paxcounter/blob/master/platformio.ini).<br>
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Target platform must be selected in [platformio.ini](https://github.com/cyberman54/ESP32-Paxcounter/blob/master/platformio.ini).<br>
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Hardware dependent settings (pinout etc.) are stored in board files in /hal directory. If you want to use a ESP32 board which is not yet supported, use hal file generic.h and tailor pin mappings to your needs. Pull requests for new boards welcome.<br>
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Hardware dependent settings (pinout etc.) are stored in board files in /hal directory. If you want to use a ESP32 board which is not yet supported, use hal file generic.h and tailor pin mappings to your needs. Pull requests for new boards welcome.<br>
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@ -196,6 +197,43 @@ Follow all steps so far for preparing the device, use the packed payload format.
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There in the sensor configuration select "TheThingsNetwork" and set Decoding Profil to "LoRa serialization", enter your TTN Application and Device Id. Decoding option has to be
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There in the sensor configuration select "TheThingsNetwork" and set Decoding Profil to "LoRa serialization", enter your TTN Application and Device Id. Decoding option has to be
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[{"decoder":"latLng"},{"decoder":"uint16","sensor_id":"yoursensorid"}]
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[{"decoder":"latLng"},{"decoder":"uint16","sensor_id":"yoursensorid"}]
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# SD-card
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Data can be stored on an SD-card if one is availabe. Simply choose the file in src/hal and add the following lines to your hal-file:
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#define HAS_SDCARD 1 // this board has an SD-card-reader/writer
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// Pins for SD-card
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#define SDCARD_CS (13) // fill in the correct numbers for your board
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#define SDCARD_MOSI (15)
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#define SDCARD_MISO (2)
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#define SDCARD_SCLK (14)
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Please choose the correct number for the connection of the reader/writer.
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This is an example of a board with SD-card: https://www.aliexpress.com/item/32990008126.html
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In this case you take the file src/hal/ttgov21new.h and add the lines given above (numbers given are for this board).
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Another approach would be this tiny board: https://www.aliexpress.com/item/32424558182.html (needs 5V).
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In this case you choose the correct file for your ESP32-board in the src/hal-directory and add the lines given above to the correct h-file. Please correct the numbers given in the example to the numbers used corresponding to your wiring.
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Some hints:
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These cheap devices often handle SD-cards up to 32GB, not bigger ones. They can handle files in the old DOS-way, to say the filenames are in the 8.3-format. And they often cannot handle subdirectories.
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The software included here writes data in a file named PAXCOUNT.xx, where xx can range from 00 to 99. The software starts with 00, checks to see if such a file already exists and if yes it will continue with the next number (up to 99 - in this case it will return no sd-card). So an existing file will not be overwritten.
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The data is written to the card and after 3 write-operations the data is flushed to the disk. So maybe the last 3 minutes of data get lost when you disconnect the PAXCOUNTER from power.
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And finally: this is the data written to the disk:
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date, time, wifi, bluet
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00.00.1970,00:01:09,2,0
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00.00.1970,00:02:09,1,0
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00.00.1970,00:03:09,2,0
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Format of the data is CSV, which can easily imported into LibreOffice, Excel, .....
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If you want to change this please look into src/sdcard.cpp and include/sdcard.h.
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# Payload format
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# Payload format
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You can select different payload formats in [paxcounter.conf](src/paxcounter.conf#L12):
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You can select different payload formats in [paxcounter.conf](src/paxcounter.conf#L12):
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