RemoteTemperatureMonitor

General notes

One esp8266 to handle multiple thermometers

ESP8266 device options

"Simple"

chip
- 16,99 + 7 = 23,99 zł

Devkit

devkit
- 29,99 + 7 = 36,99
usb charger
- 2,49 + 4,5 = 6,99

Common

green led beam: everything is working fine
green led flash: "working" (transmitting data)
red led flash: a problem (with getting temperature, transmitting data, or whatever)
~~on/off button~~ not needed (?), just unplug and plug the power supply
a few thermometers (ds18b20)
some way to plug the thermometers (it should be easy to do that)
buzzer for error sound
button to turn off sound error

Todo

inputting wifi credentials
- by usb connection and code upload
- by some built–in interface
- by some connectable interface
replace net module with http (make new flash with it): https://nodemcu.readthedocs.io/en/master/en/modules/http/
audio? https://nodemcu.readthedocs.io/en/master/en/modules/pcm/
SSL support, TLS 1.1 with 4 cipher suites? https://nodemcu-build.com/
switch to integer flash version?
nodemcu-uploader to upload files? https://github.com/kmpm/nodemcu-uploader/blob/master/doc/USAGE.md
luatool to upload files? https://github.com/4refr0nt/luatool
use master version of flash, when new version is published (~ december 2016)
multiple thermometers
- solder a third thermometer to nodemcu
- update thermometer.lua to handle multiple thermometers
~~decide if to use parasite mode for ds18b20~~ yep, parasite
plan how many thermometers would be with how many esp8266 chips
make a decision on final esp8266 chip
make plan for monitoring system
- one to put on place and one to use remotely
- lcd
- green led – everything is fine
- red blinking led – something is wrong
- sound alaram when something is wrong
- any button disables sound alarm
- button to switch between thermometers
- lcd shows thermometer name, its temperature and alarm temperature

Flash

https://nodemcu.readthedocs.io/en/latest/en/flash/
Built using https://nodemcu-build.com/
Built against the ~~master~~ dev branch and includes the following modules: file, gpio, net, node, ow, tmr, uart, wifi.
How to flash: https://nodemcu.readthedocs.io/en/master/en/flash/
Currently using float version
4 MB module, so dio flash mode (see Flash size section below)
master version doesn't work for some reason, dev must be / have been used

$ esptool.py --port=/dev/tty.SLAB_USBtoUART erase_flash
esptool.py v1.2.1
Connecting...
Running Cesanta flasher stub...
Erasing flash (this may take a while)...
Erase took 9.6 seconds

$ esptool.py --port=/dev/tty.SLAB_USBtoUART write_flash -fm=dio -fs=32m 0x00000 src/nodemcu-lua/flash/nodemcu-dev-8-modules-2016-11-22-01-12-06-float.bin 
esptool.py v1.2.1
Connecting...
Running Cesanta flasher stub...
Flash params set to 0x0240
Writing 409600 @ 0x0... 409600 (100 %)
Wrote 409600 bytes at 0x0 in 35.5 seconds (92.2 kbit/s)...
Leaving...

Flash size

https://nodemcu.readthedocs.io/en/latest/en/flash/#determine-flash-size

$ esptool.py --port=/dev/tty.SLAB_USBtoUART flash_id
esptool.py v1.2.1
Connecting...
Manufacturer: ef
Device: 4016

Chip id can be found here: https://code.coreboot.org/p/flashrom/source/tree/HEAD/trunk/flashchips.h

This leads to a manufacturer name and a chip model name/number. In our case it is AMIC_A25LQ032.

Last two or three digits in the module name denote the capacity in megabits.

A25LQ032 is a 32 Mb (4 MB) module.

MacDada / RemoteTemperatureMonitor