kiln_logger

Heat is dangerous! Evaluate the risk and make your go/no-go decision!

I have had issues with the thermocouple chip getting too hot when air temp is above 90F. It is in a metal box, 2' away from the kiln. Last firning, when the kiln was within 30C of cone 6, it started under reading. I added a computer muffin fan to cool the electronics.

Parts and pieces: I think it adds up to ~ $70 and some shipping.

Raspberry pi: any of these will work, $10 Zero W is cheapest, but a Pi 3b runs much faster and will give a desktop.

  https://www.adafruit.com/product/3775

  https://www.adafruit.com/product/3055

  https://www.adafruit.com/product/4027

  https://www.adafruit.com/product/3400

5V power supply: for the Pi

  https://www.adafruit.com/product/1995

MicroSD card: you will also need a way to write the image, e.g. usb adapter

  https://www.amazon.com/SanDisk-microSDHC-Standard-Packaging-SDSQUNC-032G-GN6MA/dp/B010Q57T02/ref=sr_1_14?keywords=micro+sd&qid=1552005480&s=gateway&sr=8-14

MAX31856 thermocouple module:

  https://www.adafruit.com/product/3263

Female <=> Female jumper wires:
```
  https://www.adafruit.com/product/266
```

20x4 LCD w/ i2c backpack: it will print to console too.

  https://www.amazon.com/gp/product/B01GPUMP9C/ref=oh_aui_detailpage_o01_s00?ie=UTF8&psc=1
  or
  https://www.adafruit.com/product/198
  https://www.adafruit.com/product/292

High temperature (2372 F) type K thermocouple:

  https://www.amazon.com/Temperature-Thermocouple-Ceramic-connector-CR-06/dp/B0713X6XG3/ref=sr_1_25?keywords=k-type&qid=1551683054&s=gateway&sr=8-25

Download Raspbien Stretch or newer and write it to the MicroSD:

  https://www.raspberrypi.org/downloads/raspbian/
  boot it up
  expand the partition, it ask on first boot
  configure network
  update software 'apt-get update' and 'apt-get upgrade'

Wiring:

fritz: 'https://raw.githubusercontent.com/BlakeCLewis/kiln_logger/master/logger_bb.png'

Pin-Out:

  Device	PI
  ----------	-------
  RPLCD VCC:	5V
  RPLCD GND:	GND
  RPLCD SDA:	GPIO 2
  RPLCD SCL:	GPIO 3

  MAX31856 3vo:	3.3v
  MAX31856 GND:	GND
  MAX31856 SDO:	GPIO 9
  MAX31856 SDI:	GPIO 10
  MAX31856 CS:	GPIO 8
  MAX31856 SCK:	GPIO 11

Install project files:

  git clone git@github.com:BlakeCLewis/kiln_logger.git

Install sqlite3:
```
  sudo apt-get install sqlite3
```

Configure raspberry pi interfaces:

  sudo raspi-config
  #enable interfaces ssh, ic2 & spi

Instal RPLCD for the 20x4 lcd:
```
  sudo pip3 install RPLCD
```

Install MAX31856 Module:

  cd
  sudo apt-get update
  sudo apt-get install build-essential python3-pip python3-dev python3-smbus git
  git clone https://github.com/adafruit/Adafruit_Python_GPIO.git
  cd Adafruit_Python_GPIO
  sudo python3 setup.py install
  cd
  git clone git@github.com:johnrbnsn/Adafruit_Python_MAX31856.git
  cd Adafruit_Python_MAX31856
  sudo python3 setup.py install

test modules:

  cd ~/kiln_logger
  python3 display.py
  python3 max31856_test.py

create the database:

  sqlite3 ~/kiln_logger.sqlite3
  CREATE TABLE firelog(RunID number, datime datetime, t number);
  .schema
  .exit

run the logger

  cd ~/kiln_logger
  ./logger.py -i <intger Run_ID> -s <interval in seconds>

access data:

  ssh pi@<pi ipaddres>
  sqlite3 kilnlog.sqlite3
  select * from firelog where runid=420 order by datime asc;