IReflow

From Land Boards Wiki
Revision as of 18:25, 10 January 2020 by Blwikiadmin (talk | contribs) (Created page with "Reflow Oven Controller IReflow-MyMenu-P1010248-640px.jpg Image shows top of iReflow and rear of MyMenu card Features IR Oven controller Lead free profile Lead profile Type K...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

Reflow Oven Controller IReflow-MyMenu-P1010248-640px.jpg

Image shows top of iReflow and rear of MyMenu card

Features IR Oven controller Lead free profile Lead profile Type K thermocouple Connection via screw terminal block ATMega328 Microprocessor Arduino compatible 16 MHz FTDI connector for serial USB ISP connector Buzzer to indicate done I2C MyMenu - OLED plus buttons 2 LEDs Supports external SSR 49x49mm form factor 4-40 mounting holes spaced 41mm apart Parts Solid State Relay SSR-25DA 25A /250V 3-32VDC for PID Temperature Controller TE Welding Blanket - To over the insides Toaster Oster 6-Slice Toaster Oven, Silver tssttvdfl2 1440 Watts, 12 Amps Oster-TSSTTVDFL2-1-512px.jpg

Reflow toaster oven conclusions:

This more expensive oven with 4 elements has more than enough power to meet the most demanding temperature slopes and ranges for reflow soldering of both lead-free and leaded solders. The oven has too much power due to the 4 elements to be run on manual without heating too quickly. The soak zone in the cycle requires a dwell for about 2x-4x the time that the oven would produce under manual control. The oven high temp thermostat has quite a bit of hysteresis but the high temperature is above the temperatures for both profiles. Set the oven to highest temp and control it. Probably doesn't need PID control although it would be cooler if it was. Definitely need PTouch labels on the door for contaminants "Don't cook food in here" and for heat "Gets hot to touch". Connectors J1 - 9V DC Power Jack Center = +9VDC (nominal) Shield = GND J2 - Solid State Relay Driven by transistor to ground +5V SSR-Output J3 - FTDI GND GND +5V TxD RxD Reset J4 - I2C OLED +5V GND SCL SDA J5 - Thermocouple Thermo + = Yellow Thermo - = Red J6 - ISP Download cable MISO +5V (+ marked on PWB) SCK MOSI RESET GND J7 - Keypad N/A with MyMenu card GND VCC SW5WAY - Analog Programming Card Driver IReflow - Arduino Card Driver - on GitHub IReflow - Example Code Fixing the Device Signature Error in the Arduino IDE The SMT ATMega328P-AU part has a different signature than the UNO. When you try to program the IReflow card using Arduino Uno as the board type you get an error avrdude: Expected signature for ATmega328P is 1E 95 0F 

        Double check chip, or use -F to override this check.

Wrong microcontroller found. Did you select the right board from the Tools > Board menu? The Arduino IDE needs avrdude.conf changed to program the AU part In earlier versions of the Arduino IDE finding the avrdude.conf file was relatively straightforward From Programming the Atmega328 - AU in Arduino Correct Signature = 0x1e 0x95 0x14; Keep old copy too. In Arduino IDE 1.6.2 the avrdude.conf file is in a different location Ard1p6.PNG

Changing it here doesn't work since it's located in a roaming directory at least for Windows 8.1 C:\Program Files (x86)\Arduino\dist\default_package.zip\packages\arduino\tools\avrdude\6.0.1-arduino2\etc Other OS versions may be different Locate the avrdude.conf file On my computer it is at: C:\Users\doug_000\AppData\Roaming\Arduino15\packages\arduino\tools\avrdude\6.0.1-arduino2\etc Find it by turning on verbose download in the IDE Atmega328-menu.PNG

The path will be shown in the output Atmega328-avdude-conf-path.PNG

Edit avrdude.conf Find the string part parent "m328" It should look like Atmega328-avdude-conf-fuses-orig.PNG

Change to Atmega328-avdude-conf-fuses-au-version.PNG

u8g OLED library Ireflow-OLED-640px.jpg

Library notes Display characters/variables: Use u8g.print (xx) function, just like the way you did with Serial.print (xx). Change the font： Use u8g.setFont (xx) function to change the font, parentheses "xx" can be replaced by the corresponding font library name (you can search font library in u8g.h within U8glib \utility folder); Large font is recommended for u8g_font_7x13, middle font for u8g_font_fixed_v0r and small font for u8g_font_chikitar; Change coordinates: Use u8g.setPrintPos (x, y) function to change the display of coordinates fonts HelloWorld Uncomment U8GLIB_SH1106_128X64 u8g(U8G_I2C_OPT_NO_ACK); // Display which does not send ACK MAX31855 Thermocouple Amplifier Adafruit Thermocouple Amplifier MAX31855 breakout board (MAX6675 upgrade) - v2.0 Adafruit Thermocouple tutorial MAX31855 Arduino library code Other LiPo Battery Care Algorithm Piece-wise Linear

  1. define TIME0_LEADFREE 0
  2. define TIMET1_LEADFREE 120
  3. define TIMET2_LEADFREE 165
  4. define TIMET3_LEADFREE 210
  5. define TIMET4_LEADFREE 218
  6. define TIMET5_LEADFREE 600
  7. define TEMPT0_LEADFREE 22.0
  8. define TEMPT1_LEADFREE 150.0
  9. define TEMPT2_LEADFREE 200.0
  10. define TEMPT3_LEADFREE 252.0
  11. define TEMPT4_LEADFREE 252.0
  12. define TEMPT5_LEADFREE -40.0

double getDesiredTempLeadFree(int currTime) { 

 if (currTime < TIMET1_LEADFREE)
   return (TEMPT0_LEADFREE + ((double)currTime                   * ((TEMPT1_LEADFREE-TEMPT0_LEADFREE)/(float)(TIMET1_LEADFREE-TIME0_LEADFREE))));
 else if (currTime < TIMET2_LEADFREE)
   return (TEMPT1_LEADFREE + ((double)(currTime-TIMET1_LEADFREE) * ((TEMPT2_LEADFREE-TEMPT1_LEADFREE)/(float)(TIMET2_LEADFREE-TIMET1_LEADFREE))));
 else if (currTime < TIMET3_LEADFREE)
   return (TEMPT2_LEADFREE + ((double)(currTime-TIMET2_LEADFREE) * ((TEMPT3_LEADFREE-TEMPT2_LEADFREE)/(float)(TIMET3_LEADFREE-TIMET2_LEADFREE))));
 else if (currTime < TIMET4_LEADFREE)
   return (TEMPT3_LEADFREE);
 return (TEMPT5_LEADFREE); // off

} Mechanicals OLED OLED Mechanicals 30654-6.jpg

Layout IReflow-CAD.PNG

Calibration Lead Solder Profile KesterSnPbCurve.PNG

Lead-free Solder Profile Lead Free

LeadFreeProfile.PNG

LeadFreeProfileParms.PNG

On Bake Setting - Manual Control - Heat/Cool Temp set to 450 deg F Ran oven until thermostat kicked in then shut off ToasterOvenBakeHeatCoolManual.png

Observations - Leaded Profile vs Manual Oven Feature Lead Solder Oven (Bake-Manual) Notes Ramp Up < 1.8 deg C/sec 2.2 deg C/sec max (1) Soak Temps 150-180 deg C Soak Time (L) 30-60 secs ~15 secs (2) Ramp to Peak ~1 deg C/sec 1 deg C/sec Peak soak 210-224 deg C Ramp-down Rate Peak is a bit too fast but average is right on Soak time needs to be extended 2x-4x the time Observations - Lead-Free Profile vs Manual Oven Feature Lead-Free Oven (Bake-Manual) Notes Ramp Up 1-4 deg C/sec 2.2 deg C/sec max (1) Soak Temps 150-200 deg C Soak Time (LF) 60-180 secs < 30 secs (2) Ramp to Peak 1-4 deg C/sec 1.5 deg C/sec Peak soak 245-260 deg C 290 max (3) Ramp-down Rate 1-6 deg C/sec max 1 deg C/sec Soak time needs to be extended 2x-4x the time Max temp should be controlled and oven left at highest temp due to hysteresis of the thermostat (pretty wide range) Table - Bake Setting Time (secs) Temp (deg C) Slope (degC/sec) 0 25.75 30 44 0.61 60 87 1.43 90 153 2.20 120 206 1.77 150 245 1.30 180 272 0.90 210 290 0.60 240 276 -0.47 270 264 -0.40 300 234 -1.00 330 213 -0.70 360 196 -0.57 390 183 -0.43 420 171 -0.40 450 162 -0.30 480 154 -0.27 510 147 -0.23 540 141 -0.20 570 134 -0.23 600 128 -0.20 630 123 -0.17 660 119 -0.13 Links Good video on How-To Assembly Sheet IReflow Assembly Sheet

Retrieved from "http://land-boards.com/blwiki/index.php?title=IReflow&oldid=1710"