Hardware and Arduino Code for DIY WMRP-Solder Station

Video: https://www.youtube.com/watch?v=le2HaKJ6B1A

If you have any questions, please feel free to contact me: flyglas (at) gmail (dot) com

Features:

• low offset op amp for soldering tip temperature measurement with type D thermocouple
• cold junction compensation using the PTC (KTY82-110) included in the WMRP soldering pencil
• input voltage measurement (for use with 3 cell lipo battery)
• soldering pencil current measurement
• recognizing if the soldering pencil rests in the stand (--> standby)
• 3 buttons for save and recall temperature values
• rotary encoder to set soldering temperature
• illuminated 16x2 character LCD module
• USB for debugging and firmware update
• clean and small enclosure
• 4mm safety socket for +12V power input and a protective earth socket for connection to ESD protection

The BOM in the layout folder includes only the parts on the PCB(s).

Parts (not on PCB):

• lcd display from ebay "Blue I2C 1602"
• modified connector "Amphenol T 3437 000" (--> http://www.mikrocontroller.net/topic/143288#1500819)
• 4mm safety sockets (red, black, green/yellow) or any other suitable connector
• rotary encoder knob
• display frame "EA027-2UKE"
• aluminium enclosure "Proma 131020"

Info:

• close jumper JP1 (activates pullup resistors for I2C wires)
• close jumper JP3 (connection between power ground and analog ground)
• leave jumper JP2 open (alternative for JP3)

Photos: 

The PCB is a little bit dirty. The Isopropanol was empty and now everything is in the enclosure. 

Stand for enclosure Proma 131020: 

First picture of a replica:

Thank you Dennis for the nice conversation and the picture.