Difference: RealTimeClockAndDataLogging (6 vs. 7)

Revision 72020-05-26 - UliRaich

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META TOPICPARENT	name="Exercises"

Exercise 9: RTC and data logging

Introduction

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Write a module with 2 functions synchronizing the clocks:

synchronize the ds1307 clock with the ESP32RTC time
synchronize the ESP32RTC with the ds3017 time

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Exercise 5: Mount the SD card

Write a script to mount the SD card on the RTC and data logger module on "/sd". Create a directory /sd/data and check that is has been created as expected.

Exercise 6: Data logging

Write a script that

sets up the ESP32 RTC using ntptime
reads temperature and humidity values from the SHT30 every 5 s
write the time stamp and temperature and humidity values for the file /sd/data/sht30Data.txt
transfer the data to the PC and analyze them

The binary of MicroPython contains an ftp server named uftpd. You can start it by simply importing the module:

import uftpd

After that you can transfer the file with ftp to your PC

Concerning the time stamp there is a difference between MicroPython and CPython: MicroPython starts counting at 2000-01-01 while CPython uses Unix epoch, which starts at 1970-01-01.

timeStampCPython = timeStampMicroPython + time.UNIX_TIME which is the constant 946681200

MPY epoch is 2000-01-01 instead of unix epoch, which is 1970-01-01.

Uli Raich - 2020-05-06

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