Arduino Serial Data Logger4/14/2021
Then we just print() it to the card with a comma seperating the two.Control LEDs, servos, and inputs all together with minimal contention.
Arduino Serial Data Logger Code Is VeryWe strongly suggest reading through it, the code is very versatile and our text descriptions should make it clear why everything is there.OK this is the top of the file, where we include the three libraries well use: the SD library to talk to the card, the Wire library that helps the Arduino with i2c and the RTClib for chatting with the real time clock. Arduino Serial Data Logger Serial Monitor ForThis makes the logger a little more sluggish and you may want the serial monitor for other stuff. If you have this on you basically cant have it run away from the computer so well keep it off (set to 0 ) for now. For all our shields we use pin 10 for SD card chip select lines. It prints out the error to the Serial Monitor, turns on the red error LED, and then sits in a while(1); loop forever, also known as a halt. If we set WAITTOSTART to anything but 0, the Arduino will wait until the user types something in. We do a little tricky thing here, we basically want the files to be called something like LOGGERnn. By starting out trying to create LOGGER00.CSV and incrementing every time when the file already exists, until we get to LOGGER99.csv, we basically make a new file every time the Arduino starts up. Now we kick off the RTC by initializing the Wire library and poking the RTC to see if its alive. The header is the first line of the file and helps your spreadsheet or math program identify whats coming up next. The data is in CSV (comma separated value) format so the header is too: millis,time,light,temp the first item millis is milliseconds since the Arduino started, time is the time and date from the RTC, light is the data from the CdS cell and temp is the temperature read. The logfile.print() call is what writes data to our file on the SD card, it works pretty much the same as the Serial version. If you set ECHOTOSERIAL to be 0 up top, you wont see the written data printed to the Serial terminal. There is a commented-out line where we set the analog reference voltage. This code assumes that you will be using the default reference which is the VCC voltage for the chip - on a classic Arduino this is 5.0V. You can get better precision sometimes by lowering the reference. However were going to keep this simple for now Later on, you may want to experiment with it. If you recall we defined the delay between readings to be 1000 millseconds (1 second). By having more delay between readings we can use less power and not fill the card as fast. It can be handy to have - especially if you end up not using the RTC. Once we have that, we write a timestamp (seconods since 2000) as well as the date in YYMMDD HH:MM:SS time format which can easily be recognized by a spreadsheet. We have both because the nice thing about a timestamp is that its going to montonically increase and the nice thing about printed out date is its human readable.
0 Comments
Leave a Reply.AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |