Tiny Reflow Controller

Description

Every single piece of hardware that we ship out the door here were manufactured using our very own Reflow Oven Controller Shield. And we have sold countless number of them over the years and we are glad that it help many people to start reflowing their own SMD components in a reliable and repeatable manner. Along the way, we received many feedback from users and we took those feedback seriously and incorporate them in a new all-in-one reflow oven controller. Powered by the ATtiny1634R coupled with the latest thermocouple sensor interface IC MAX31856 from Maxim, we managed to remove the need of an Arduino board and reduce the overall cost. We also use as much SMD parts in this revision to keep the cost low (manual soldering and left over residue cleaning is time consuming) and leaving only the terminal block and the LCD connector on through hole version. We also managed to streamline all components to run on 3.3V to further simplify the design. All you need is an external Solid State Relay (SSR) (rated accordingly to your oven), K type thermocouple (we recommend those with fiber glass or steel jacket), and an oven of course! You can now select to run a lead-free profile or leaded profile from the selection switch. The example code running the reflow process utilized a PID control provided by the awesome PID library written by Brett Beauregard. Features:

• Powered by ATtiny1634R (thank you Spence Konde for the awesome work on the ATtiny core)
  • We chose the “R” version for more accurate internal oscillator on the ATtiny1634R
  • The current firmware only uses 10kB of the 16kB program memory flash and half of the 1kB RAM leaving lots of room for tinkering
• MAX31856 thermocouple interface
• Immersion gold finish allows easier soldering
• 8×2 LCD black character with yellow back light
• 2 push button connected to a single analog pin:
  • 1 to start and stop the reflow process
  • 1 to select the reflow profile (lead-free or leaded) and stored on the non-volatile EEPROM
• 1 red LED for status indication
• 1 terminal block for thermocouple type K
• 1 terminal block for driving SSR (through a NPN transistor) to control heating element/oven
• 1 buzzer with transistor for loud and annoying sound
• 1 reset button
• ISP pins breakout
• FTDI 6-pin breakout for firmware upload and serial interface
• Unit is powered through a microUSB connector or the FTDI 6-pin header
• Dimension – 40.00 mm x 51.00 mm
• RoHS compliant – Yes

Documentation:

• What oven to get?
• Schematic
• Design files & firmware examples on Github
• User guide
• Oven builds by customers