How to use with temperature-controller chamber

To use the temperatur-controlled chambers, following steps have to be taken. Please note the difference in MQTT broker usage when using a single or multiple chambers.

Broker for single chamber

When using a single chamber, only one MQTT broker is required. Therefore using mosquitto_master.conf is sufficient. However, two could also be used, if you want to use the same architecture in both cases.

mosquitto -c mosquitto_master.conf

Broker for multiple chambers

When using more than one chamber, a master broker should be used as in the previous chapter, that connects all chambers. Each chamber will have their own, local MQTT broker that can be started with, which connects to the master broker.

mosquitto -c mosquitto_slave.conf

Make sure to edit the configuration accordingly:

• Set remote_clientid
• Set host and port in address
• Set connection name (optional)

How to use a temperature-controlled chamber

How to use the chambers...

Requirements

To start the chamber, check out the git and install both mosquitto and the required python packages:

apt install mosquitto
pip3 install -r requirements.txt

Usage

To start the chamber simply run the following command:

python3 -u module_loader.py [-vvvv] ChamberController [MODULES ...]

Depending on the sensors used in your setup, at least on of SHT21 and DS1820 should be included in the module list. Make sure you create a configuration file (modules.conf) to configure the ambient and chamber's temperature sensors.

NOTE: Instead of an ambient temperature sensor, you can also specify AmbientTemperature. See modules below for additional configuration options.

[CHAMBER]
ChamberTemperatureTopic = sht21/<host>/temp
AmbientTemperatureTopic = ds1820/<host>/<sensor_id>/temp
AmbientTemperature = 40.0

Modules

This chapter describes the various modules.

ChamberController

TODO

Configuration

[CHAMBER]
ChamberTemperatureTopicPrefix = sht21/<host>/
AmbientTemperatureTopicPrefix = ds1820/<host>/<sensor_id>/
AmbientTemperature = 40.0
Republish = yes

Topics

chamber/<host>/target - Set the target temperature

chamber/<host>/temp - Temperature of the chamber (republishes the ChamberTemperatureTopic, only if Republish=yes) chamber/<host>/humidity - see above.

SHT21

[SHT21]

TODO

Configuration

Topics

DS1820

TODO

Configuration

[DS1820]

Topics

HotPlug

TODO

Configuration

[HotPlug]

Topics