Connecting the Anova Precision Cooker to Cayenne


#1

About This Project

If you have never heard of the Anova, you are missing a wonderful, wonderful gadget in your life. Imagine coming home after a long day, and waiting for you is the perfect medium rare steak, perfectly cooked fish, or the most tender but still crisp asparagus. If you are any type of foodie at all, you NEED this machine!

Check it out here: Anova Precision Cooker

As a somewhat early adopter, I picked up an 800W version with Bluetooth only. For the most part, I don’t even use the Bluetooth or the phone App, but it would sure be nice to be able to monitor a 50 hour cook of a pork shoulder roast - succulently tender, yet still medium rare. For that you need the WiFi model!

I was too cheap to upgrade, so I just plugged along, using my Anova without being able to spark it up from the cloud. That was until the Raspberry Pi Zero W came around.

The W, pronounced Dubya - because I said so, is a single core SOC board, but with built in WiFi and Bluetooth. A plan was hatched.

Let’s see if we can integrate the Pi with the Anova and get it on Cayenne!!

What’s Connected

This is a great project for folks that don’t solder, are afraid to wire stuff, but still want to play with IoT.

You need an Anova Precision Cooker, A 5V USB power supply, a Raspberry Pi Zero W, and 8GB micro SD card (might get away with smaller but they’re cheap like Borscht, don’t hurt yourself). You will also need the Mini HDMI connector and a micro USB to USB A female cable to connect a keyboard to configure the Pi.

How To

Note, pay particular attention to steps 1,9, 11, and 15. Very important.

  1. First of all, acquire yourself a tasty beverage.

  2. Next, install Raspbian onto your microSD card. Get Jessie Lite, you don’t need Pixel.

    https://www.raspberrypi.org/downloads/raspbian/
    https://www.raspberrypi.org/documentation/installation/installing-images/README.md
    I used Win32DiskImager myself, but looks like RPi recommends Etcher in the above guide.

  3. Plug in your microSD, your keyboard, monitor, and power for the Pi.

  4. Login with pi/raspberry and change your password. Don’t be a newb. https://www.raspberrypi.org/documentation/linux/usage/users.md

  5. Run sudo raspi-config and expand file system, set keyboard to the US, and turn on the ssh server.
    https://www.raspberrypi.org/documentation/configuration/raspi-config.md

  6. Configure your wifi. https://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md
    Make sure you use wpa_passphrase and don’t forget to delete your human readable passphrase from wpa_supplicant. Keep the interwebs safe!

  7. Reboot, login, and make sure you have Wifi with ping mydevices.com for instance.

  8. Now type ifconfig to find your ip address, and if desired use putty on your pc to connect to your pi. I like this better, because I can now just disconnect the keyboard and hdmi - no longer needed.

  9. Have a drink.

  10. Now you are going to want to do the following commands to get all the stuff. I am using a library I found for talking to the Anova here: https://github.com/erikcw/pycirculate and the Cayenne MQTT lib here: https://github.com/myDevicesIoT/Cayenne-MQTT-Python/

    sudo apt-get update
    sudo apt-get install python-pip
    sudo apt-get install libglib2.0-dev
    sudo pip install bluepy
    sudo pip install pycirculate --pre
    sudo pip install cayenne-mqtt

  11. Ok, have another drink.

  12. Now, make sure your Anova is plugged in, and run sudo hcitool lescan. Record the MAC address of your cooker.
    Connect to the Cayenne dashboard, and create a new Bring Your Own Thing Device. Record the MQTT and Client ID credentials.

  13. Create a file on your Pi, and call it something like Cayenne.py, and drop in the following code. If you aren’t comfortable with Linux command line, you could create this file in something like Notepad++ and transfer it over with something like WinSCP. https://winscp.net/eng/download.php

  14. Change the credentials to what you recorded above, and run with python Cayenne.py. It should connect and you will see your dashboard auto populate.

  15. Have another, you’ve earned it.

  16. Next, you will want to create a Setpoint slider on Channel 4 and set it’s min and max to 5 and 99. This is what the Anova can do. If you don’t like Celcius, deal with it. You can configure it to F all you like later. You will also want to create a pushbutton on Channel 5.

  17. Bob should now be your uncle, you’ll be high fiving yourself, and your wife will say, “Are you drunk?”.

  18. If you is the happy, you can then do a sudo crontab -e, and add the following to the end of your cron file:
    @reboot /home/pi/Cayenne.py &
    This will make sure the script is always called on reboot, and you don’t need to touch the pi again. Of course you will. I know you. You can’t help yourself.

The Code

#
#Connect your Anova to MyDevices Cayenne.
#

#import time and date stuff
import datetime
import time

#import Anova lib
from pycirculate.anova import AnovaController
#get Cayenne
import cayenne.client

#MQTT Credentials
MQTT_USERNAME = "..."
MQTT_PASSWORD ="..."
MQTT_CLIENT_ID = "..."

# Your Anova Address goes here, run `sudo hcitool lescan` and record
ANOVA_MAC_ADDRESS = "..."

#Cayenne message callback
def on_message(message):
  print("message received: " + str(message))

  #set the temperature setpoint if we get a slider message
  if message.channel == 4:
    ctrl.set_temp(message.value)
    print("Setpoint set to " + message.value + " degrees")

  if message.channel == 5:
    if (message.value == '1'):
      ctrl.start_anova()
      print("Anova Started")
    else:
      ctrl.stop_anova()
      print("Anova Stopped")


#Initialize Cayenne
client = cayenne.client.CayenneMQTTClient()
#Set the Cayenne message callback
client.on_message = on_message
#begin a Cayenne session
client.begin(MQTT_USERNAME, MQTT_PASSWORD, MQTT_CLIENT_ID)

#grab your Anova
ctrl = AnovaController(ANOVA_MAC_ADDRESS)

def main():
    print datetime.datetime.now()
    #Canadians do Celcius
    print ctrl.set_unit('c')

    i=0
    timestamp = 0

    while True:
      #Cayenne kick
      client.loop()

      #Call every 10 seconds
      if(time.time() > timestamp + 10):

        #send the current temperature
        client.celsiusWrite(1,ctrl.read_temp())

        #send the set temperature
        client.celsiusWrite(3,ctrl.send_command_async("read set temp"))

        #send the run status
        if (ctrl.anova_status() == 'stopped'): a_stat = 0
        else: a_stat = 1
        client.virtualWrite(2,a_stat)

        #save last timestamp
        timestamp = time.time()



#    print ctrl.read_temp(), ctrl.read_unit()
#    print ctrl.set_temp(TEMP)
#    print ctrl.start_anova()
#    print ctrl.anova_status()


if __name__ == "__main__":
    main()

Triggers & Alerts

Again, yep. Imagine dropping some frozen steaks in in the morning, and start cooking when they are thawed, then hold a lower safe temperature until you’re on your way home.

Sound crazy? We do it because we can!!

Scheduling

Yep. Baby wakes up at 2am. Warm milk is ready at precisely the right temperature.

Dashboard Screenshots

Photos of the Project

Video

This hacking session brought to you by Glenlivet 15.

Cheers,

Craig


Running Cayenne on Asus Tinker Board
Cayenne, slow cooker, relay, and DS18B20?
#2

Awesome!


#3

Awesome project, nice to finally see some bluetooth around here!


Micro:bit Microcontrollers
#4

@adam,

I am going to try the same thing with an ESP amd a cheap serial Bluetooth. Don’t know if Bluetooth LE is supported though, so may be spinning my wheels.

Cheers,

Craig


#5

This is my first introduction to Cayenne, my first Pi project, and the first time I have written any code since learning the basics in high school. Fantastically documented and completely thorough. Thank you! The hardest part was getting my Pi Zero W online. Took a lot of messing with wpa_supplicant.conf before it ever took.


#6

@thomas.biard576,

You should have started with the Glenlivet. You would have been online in seconds!

Cheers,

Craig


#7

Hey @kreggly
Looking forward to wake up to perfect sous vide eggs every morning.

I seem a bit stuck with the code tho. Running it on Thonny, it shows me

%Run cayenne.py
File “/home/pi/cayenne.py”, line 52
print datetime.datetime.now()
^
SyntaxError: invalid syntax


#8

you can delete the line.