TFT LCD display, cottage white t12 electric soldering iron DIY (open source)

T12 white soldering iron is also a very classic project in electronic DIY, so that T12 white DIY soldering iron is also a standard of enthusiasts and professionals; the entire circuit of T12 can be said to be a standard temperature control system, so the code is slightly restructured You can achieve a variety of thermostats. T12 is currently doing the 12864 OLED scheme, and a few low-end is still using a digital tube. In order to highlight the Deluxe version of T12, we decided to take 2.8-inch SHMICTRL LCD screen to do so, which can be luxurious enough In order to do this project, I bought a minimum of the minik on a treasure. To tell the truth, I bought a handle, afraid to boil myself. Ok, there is not much nonsense, the above picture: Use the original housing to make a bracket, connect the screen. The standard T12 control is used on the circuit: PWM signal control MOS to heat the iron head heating The tip thermocouple signal is enlarged: A standard op amplification circuit, the zoom signal is about 200 times Power section: 40V or below can be input, transferred to 5V, using the screen and single chip microcomputer using C12 reserved pads All schematic, see the bottom Real PCB and next The location of the ESP12S is reserved in the figure, theoretically, it can be made of material iron, but there is no practical use, just reserved. Core control algorithm Some people think that the control algorithm is very mysterious, in fact, it is very simple; INT TAD = 0; // Temperature AD value INT PWM = 327; // Tanowing half INT setuPad = 900; // set AD value Void Ctrl0 () { IF (tadsetupad) { PWM = 100; // Basic equivalent to close } Else { // Automatically calculate PWM PWM = (setUpad-tad) * 65535/100; } } } This function is the control algorithm. You can see that there is no one line of code. It is roughly that each time the temperature measurement is available (TAD), call this function, calculates the Target AD value (Setupad) to calculate the need to heat PWM duty cycle; It can be seen that when TAD is relatively large, 100% is fully heated; when 100, according to the difference in size, the PWM value is dynamically, when the temperature exceeds the preset temperature, give a very small PWM Maintenance, of course, can also be closed; Of course, this is just the principle. Please refer to the source code, several groups. interface: actual effect: From 80 degrees to 250 degrees, the actual welding has no significant cooling. 50 degrees rose to 450 degrees. Be Be Article comes from the network

 

 

 

 

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