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Cheap temperature control mod
Cheap temperature control mod







cheap temperature control mod

Philips LPC2000 Flash Utility v2.2.3 was used to flash the controller through the ISP header present on the board.

cheap temperature control mod

The firmware was originally built with LPCXpresso 7.5.0 as I've never dealt with the LPC2000-series NXP microcontrollers before so I just wanted something that wouldn't require TOO much of work to actually produce a flashable image. The custom firmware uses spare ADO test point to control it. The system fan is very noisy an can be turned of most of the time. Wiki: cold junction compensation mod Check mains earth connectionĪs mentioned elsewhere, make sure the protective earth/ground wire from the main input actually makes contact with the back panel of the chassis and also that the back panel makes contact both with the top and bottom halves of the oven! System fan PWM control Some hot-glue may have to be removed to actually get to the side of the connector and the ground plane, someone seems to have been really trigger-happy with the glue gun! GPIO0.7 in particular was very convenient for 1-wire operation as there was an adjacent pad with 3.3V so a 4k7 pull-up resistor could be placed there, then a jumper wire is run from GPIO0.7 pad to the Dq pin of a cheap DS18B20 1-wire temperature sensor that gets epoxied to the terminal block, soldering both Vcc and ground pins to the ground plane conveniently located right next to it. It turns out that both an analog input and at least one generic GPIO pin is available on unpopulated pads on the board. We can fix this by adding a temperature sensor to the connector block where the thermocouples are connected to the controller board. The existing controller makes the assumption that the cold-junction is at 20 degrees Celsius at all times which made keeping a constant temperature "a bit" challenging as the terminal block sits on_top_of_an_oven with two TRIACs nearby. Instructable suggesting replacing masking tape with kapton tape. As you have to open the top part of the oven anyway to reflash the software this is a no-brainer fix: Replace stinky masking tape Here are a few improvements made to the cheap T-962 reflow oven utilizing the existing controller hardware with only a small, cheap, but very necessary modification. After having had a closer look at the hardware (replacing the masking tape inside with Kapton tape first) it was obvious that there was a simple way to improve the software disaster that is the T-962.

  • We have Travis-CI in place to build pull requestsĪs we had use for a small reflow oven for a small prototype run we settled for the T-962 even after having seen the negative reviews of it as there were plenty of suggestions all across the Internet on how it could be improved including replacing the existing controller and display(!).
  • Custom firmware for the cheap T-962 reflow oven utilizing the existing controller hardware.









    Cheap temperature control mod