Micropython cave data logger on ESP8266 using accelerometer and is very intelligent
Work in progress
(See below for setting up from scratch)
With a sparkfun LSM9DS1 (only I2C broken out, no interrupt generating pins) on the I2C bus the Acceleromater/Gyro unit is on 0x6B and the Compass is on 0x1E
I have a soldered unit with a light cell on the ADC pin, a dallas temperature sensor string on Pin12 and two LEDs on pins 2 and 16.
The http://192.168.4.1/index.html page will get an inteface for checking and resetting the RTC from your device as well as lining it up against your device.
If you access the ESP with webrepl you can import aw1 and then run aw1.wsall() to serve onto the url http://192.168.4.1/a200 for 200 consecutive readings of the accelerometer into a csv file. (Same for (g)yros, (c)ompass, and (t)emperatures.)
The pendule jupyter notebook will call this url and then plot your xyz readings of the device. It can also conduct FFT and find the peak frequencies. This can be used to look for pendulum swings and other oscillations.
Stuff to do
Find a waterproof container that can take the adafruit boards and power supplies as they are (without any board designs) that are likely to get data for about a day.
The ultra-low-power change monitoring using a Schmitt trigger and programmed DAC/potentiometer to get an immediate interrupt signal when there is a light change, temperature change (relative to an thermistor), or motion.
Design a circuit board for surface mounted ESP, one of these LSM9DS1 accelerometers (distant enough to rely on temp sensor pressed against the wall), power circuits, light cell, LEDs and commission some
Ensure we've got memory management (for logging), proof of sleep modes that are low power, wake up interrupts from the accelerometer and light (so that we can have extended sleep periods) and begin coding first basic version for release.
Build the boards and fit to caves and/or shoes for step measurements, say.
Setting up from scratch or reflashing
pip2 install esptool
$ esptool.py --port /dev/ttyUSB0 erase_flash
$ esptool.py --port /dev/ttyUSB0 --baud 460800 write_flash --flash_size=detect 0 binaries/esp8266-20170108-v1.8.7.bin
Then need to log in to setup the webrepl $ picocom -b115200 /dev/ttyUSB0
then do import webrepl_setup and it asks for a password: wpass
this makes webrepl_config.py with the password in it
often needs a powercycle here.
Connect to wifi hotspot password: micropythoN can ping to 192.168.4.1
import os os.mkdir("static") os.mkdir("data")
Disconnect webrepl. Now you can call $ ./uploadall.sh on your computer to upload all the files
We need to make from scratch the micropython so that we can have precompiled modules in it
https://gerfficient.com/2016/10/03/esp8266-getting-started/ cd esp-open-sdk make
cd micropython make -C mpy-cross
Use webrepl to access it, but with too much wifi it's slow:
Can copy over the ../webrepl/webrepl_cli.py main.py 192.168.4.1:
Now make a micropython build https://github.com/pfalcon/esp-open-sdk
clone the https://github.com/micropython/micropython export PATH=/home/goatchurch/datalogging/esp-open-sdk/xtensa-lx106-elf/bin:$PATH
go into micropython: git submodule update --init