BrewPi Spark for meat curing chamber

Hardware
1

I would like to turn a second fridge into a meat curing chamber with a OneWire expansion board. The setup needs to be slightly different as temperature and humidity are important. Is it possible to use and monitor a hygrometer to measure humidity as well as control a humidifier?

Many thanks in advance for any help and thoughts!

2

Reading a hygrometer like the DH22 will require a local microcontroller. The BrewPi Spark has OneWire and RS-485 for communicating with sensors.

Unfortunately, OneWire AD-converters have been discontinued.

So your best bet would be to have a local microcontroller read the DH22 and talk to the main controller over RS-485.

3

here is a 4 port ad 1wire adapter that may be hacked, at on 16 bucks it may be worth it. are you going to do charcuterie ?
I have wanted to get in to salami making for some time.
http://pcsensor.com/1-wire-series/1-wire-quad-a/d-converter-usb-pc-converter.html

alternative to the DS2459
Dallas DS2450 emulation with Tiny AVR
http://www.mcselec.com/index.php?option=com_content&task=view&id=256&Itemid=57

this may also be of some use to both of you.
this guys appear to be running a humidity sensor off of a 1 wire battery monitoring chip , it has a temp sensor and analog inputs
http://www.datanab.com/sensors/1wire-temperature-humidity-sensor-th_prb_mini_rj12.php
http://www.datanab.com/zc/docs/datanab/other/DS2438.pdf <— 1wire temp with AD inputs
http://www.datanab.com/zc/docs/datanab/other/HIH_4000.pdf <---- humidity sensor

4

First, thank you both for the quick answers! @ClaytonRoss, thanks so much for the information and yes, this will be for charcuterie!

@Elco will the device in the link below work without an extra microcontroller? I would like to keep this as simple as possible, if possible. Any feedback you might have would be fantastic.

http://www.datanab.com/sensors/1wire-temperature-humidity-sensor-th_prb_mini_rj12.php

Thanks again to you both!

5

Looks like it could work if you:

  • Put on a new the RJ12 plug, because the pinout is different
  • Add software support to the firmware, specifically, add a class for the DS2438

Especially the second step is not trivial.

6

Hello, I was wondering if you could integrate the moisture sensor in the Brewpi with the Spark control? I want to use the fridge as a maturing room for cheese. Which sensor did you use and what did you adjust in the controller?

Greeting

Bart Peeraer