SD Card file write
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Max May
Jan 22, 2021, 12:39:24 AM1/22/21
to Annex WiFi RDS
Hallo,
is there any possibility or example for writing, reading or append a file to a SD Card with Annex32. I want to build a datalogger and I love the Annex Wifi RDS
Thank you in advance for your help.
Max
is there any possibility or example for writing, reading or append a file to a SD Card with Annex32. I want to build a datalogger and I love the Annex Wifi RDS
Thank you in advance for your help.
Max
cicciocb
Jan 22, 2021, 5:01:12 AM1/22/21
to Annex WiFi RDS
Hi,
yes it is possible to connect an SDCARD to the ESP32 to create a data logger very easily.
You can find all the information in the documentation
Max May
Jan 22, 2021, 7:14:21 AM1/22/21
to Annex WiFi RDS
Hallo cicciob,
thank you for your answer, but what are the commands that a can use to store data on the card?
Did you have an example to append a line of data to a file or start a new file on the sd card?
For example a temperatur from a DS 18B20 Temperature Sensors every second or something like that.
Thank you in advance.
Max
thank you for your answer, but what are the commands that a can use to store data on the card?
Did you have an example to append a line of data to a file or start a new file on the sd card?
For example a temperatur from a DS 18B20 Temperature Sensors every second or something like that.
Thank you in advance.
Max
PeterN
Jan 22, 2021, 9:13:28 AM1/22/21
to Annex WiFi RDS
Take a look at the chapter "FAT32 File System" in the help file. I think that answers all of your questions.
Good luck
ciccio cb
Jan 22, 2021, 10:29:27 AM1/22/21
to Annex WiFi RDS
Hi Max,
this is a little data logger example using the serial port (the default ) at the standard speed 115200.
You can eventually set the serial speed with the command
SERIAL.MODE
or use the 2nd serial port defining freely the TX and the RX pins
CODE: logger.bas
'data logger example
'
' define the log file name
fn$ = "/mylog.txt" ' defi
onserial serial_received
wait
serial_received:
'waits 50 msec in order to receive more bytes
'as the event is very fast
pause 50
a$ = serial.input$
file.append fn$, a$
return
'
' define the log file name
fn$ = "/mylog.txt" ' defi
onserial serial_received
wait
serial_received:
'waits 50 msec in order to receive more bytes
'as the event is very fast
pause 50
a$ = serial.input$
file.append fn$, a$
return
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Max May
Jan 22, 2021, 6:30:44 PM1/22/21
to Annex WiFi RDS
Hallo PeterN and cicciocb,
both answers helps me lot, thank you very mutch for that.
I am a newby to the annex Wifi RDS and maybe it sounds like a stupid question, how do I select where I write the file, to the internal FATFS or the external SD CARD?
Sorry for this new question.
Max
both answers helps me lot, thank you very mutch for that.
I am a newby to the annex Wifi RDS and maybe it sounds like a stupid question, how do I select where I write the file, to the internal FATFS or the external SD CARD?
Sorry for this new question.
Max
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ciccio cb
Jan 22, 2021, 7:00:11 PM1/22/21
to Annex WiFi RDS
Hi Max
The functions are the same for both internal FATFS or SD CARD.
If an SD CARD is detected when the module boots, the file system is automatically selected to the SD CARD otherwise the internal is selected.
They are mutually exclusive and cannot be used at the same time
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Max May
Jan 23, 2021, 2:52:53 PM1/23/21
to Annex WiFi RDS
Thank you very much for your help
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Timothy Truckle
Jan 25, 2021, 2:03:45 AM1/25/21
to Annex WiFi RDS
Hi, cicciocb, PeterN,
how can i determine if the sd card is activated when booting the esp32?
Regards
Peter
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ciccio cb
Jan 25, 2021, 2:19:21 AM1/25/21
to Annex WiFi RDS
Hi,
There is no special function for that but you could check the free space available on the disk.
Cicciocb
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Timothy Truckle
Jan 25, 2021, 3:46:59 AM1/25/21
to Annex WiFi RDS
THX
Hi,
Cicciocb
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Timothy Truckle
Jan 25, 2021, 11:47:12 AM1/25/21
to Annex WiFi RDS
Small update: The SD card works on a Heltec ESP32 Lora. The culprit was a solder joint that was not soldered correctly. The file manager now shows approx. 4000000 bytes. It would be interesting to be able to use the Lora and BT functions :-)
Regards Peter
Am Montag, 25. Januar 2021 08:19:21 UTC+1 schrieb cicciocb:
Hi,
Cicciocb
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