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Turns a Raspberry Pi into a cheap, universal & web-enabled Reflow Oven Controller. Of course, since it is basically just a robot sensing temperature and controlling environmental agitators (heating/cooling) you can use it as inspiration / basis when you're in need of a PID based temperature controller for your project. Don't forget to share and drop a link, when you do :)

Standard Interface


Curve Editor



  • Raspberry Pi (Rev 2B)
  • MAX 31855/6675 Cold-Junction K-Type Thermocouple
  • GPIO driven Solid-State-Relays/MOSFETs



We've tried to keep external dependencies to a minimum to make it easily deployable on any flavor of open-source operating system. If you deploy it successfully on any other OS, please update this:

Currently tested versions

  • greenlet-0.4.2
  • bottle-0.12.4
  • gevent-1.0
  • gevent-websocket-0.9.3
  • numpy
  • scipy


$ sudo apt-get install python-pip python-dev libevent-dev
$ sudo pip install ez-setup
$ sudo pip install greenlet bottle gevent gevent-websocket python-numpy python-scipy

Raspberry PI deployment

If you want to deploy the code on a PI for production:

$ pip install RPi.GPIO

This only applies to non-Raspbian installations, since Raspbian ships RPi.GPIO with the default installation.

Clone repo

$ git clone
$ cd picoReflow


All parameters are defined in, just copy the example and review/change to your mind's content.

$ cp


Server Startup

$ ./

Autostart Server onBoot

If you want the server to autostart on boot, run the following commands

sudo cp /home/pi/picoReflow/lib/init/reflow /etc/init.d/
sudo chmod +x /etc/init.d/reflow
sudo update-rc.d reflow defaults

Client Access

Open Browser and goto (for local development) or the IP of your PI and the port defined in (default 8080).


This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with this program. If not, see

Support & Contact

Please use the issue tracker for project related issues.

More info:


Turns a Raspberry Pi into a universal, web enabled Reflow Oven Controller



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