Teach you to do a battery-powered open source RT welding pen

Each hardware engineer or a game is a good welding tool, which is based on the occupation of our engaged or love. At the same time, it is most acceptable that the welding tool is not as expensive as the high-end test instrument. As a person can also bear, the welding tool can also be designed in this era, which is high quality and small, with precise control and Function. Before designing my own welding project, I also refer to some other design on the market. For example, I found that some projects used a Weller skating iron, the soldering iron head designed for WMRP, with 3.5mm standard jack, The inside of the soldering iron is also a thermocouple for inductive temperature. These items are high, especially for fine welding. So my welding pen hardware design is based on similar projects, but there are some modifications and improvements. In addition, my request is to make the hardware as small as possible to suit the handle, and can power the lithium battery of the affair, so that it can be a real portable soldering pen. The following soldering pen is my initial product, the effect is still very good. Basic specifications and functions: Supported weld head: all Weller RT tips with 3.5mm jack. Power supply voltage: 5-18V (Recommended: 7-15V) Power supply: The peak is 5A @ 10V, 6A @ 12V, 8A & 16V, etc. (the average resistance of the RT heating element is 2 ohms, so the current peak depends on the power supply voltage) Power current: maximum 15mA Adjustment: PSD (PID) regulator with PWM power transmission (125ms) Set point temperature: 50 ° C-500 ° C Maximum measurement temperature: 999 ° C Maximum heating power: limited to SW to 40W or by power supply voltage limit: 40W @ 11V, 20W @ 8V Heating speed: 30 ° C-> 300 ° C: Using RT-2 pen and 40W limit about 4s Temperature accuracy: approximately +/- 5 ° C (plan calibration) Other features: Celsius / Fahrenheit, right / left hand mode, normal / advanced mode display Complete reverse protection with FET diodes After the device is idle for 15 minutes, turn off the power to protect the display. Brightness setting 4-layer PCB Firmware update: actual firmware by any SWD programmer (ST-LINK) Here is the demo Demo of the RT welding pen. Be Source: HackADAY.IO The original content of the circuit city is not allowed to reprint!

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