![]() ![]() A custom ATmega32u4 board I decided to make my own ATmega32u4-based microcontroller board for several reasons.Reflow hot plate controller board Description:This project realizes a custom made reflow hot plate controller.TCD1304 miniature PCB In this project, I continued working with the TCD1304 linear CCD.Weighing scale made of a PCB In this project, I wanted to try something new and fun.First, I wanted to know if I can use the trac.Custom ADS1256 board with ATmega32U4 I created my own ADS1256 PCB after working with this AD converter for several years.Also, check my website for extra resources and a video explaining the board.Ĭheck the following video where I explain everything about the board, the heater and I explain the source code line by line: There is a very useful interactive BOM file in the attached zip file. Replace it if you use a larger load.įor all the parts and the values, check the attached BOM file. The varistor (PTC) I picked (SIOV-S05K250) is sized for 5 A.Also, leave a little gap between the PCB and the heatsink because one of the 230 V trace is running under the heatsink. Use a mica sheet is something similar between the TRIAC and the heat sink. The TRIAC must be isolated from the heatsink. ![]() Keep in mind that the TRIAC-side resistors must be high power resistors 1 W at least.I suggest to solder the MAX6675 module, the rotary encoder and the display directly to the PCB.You can also attach a tiny heatsink to the BD139 transistor, but probably it is not necessary because it switches relatively low power.Keep in mind that the TRIAC I picked is "only" a 8 A one. You can add a larger heatsink to the TRIAC if you want to use it with high-power heaters.Typically, the 5 V brick provides 600 mA and the 12 V provides 250 mA. Based on the selected power brick (5 V or 12 V), you have to choose the fans carefully to stay within the specifications of the power brick.The board has 4 mounting pads at the (rounded) corners, plus there is a protective earth connection that allows an easy connection to the metal parts that should be grounded. The high-current traces are at the bottom of the PCB, there is only a few high-voltage (230 V) traces on the top side and they do not carry large currents, they are only used for the switching the TRIAC. I added some gaps to the board to avoid arching at critical places. The switching of the heater is done by an optocoupler-TRIAC combo. The system also contains two outputs for fans, so at the end of the heating program, a forced cooling can be applied. The temperature is measured with a thermocouple via a MAX6675 module. All the parameters can be set with a rotary encoder. temperature graph is shown on a 1.8" LCD. The programmable reflow curve and the real-time time vs. I made a fancy graphical user interface for programming the heating curve and displaying the temperature in real time. This project realizes a custom made reflow hot plate controller. ![]()
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