Project Name: Arbitrary Warm Pad #Jialichuang Electric Heating Film
Project Author:shelton2.0
Introduction
As the weather gets colder,
I used a free PCB + electric heating film to make a heating pad~~
It can warm hands, feet, and even the stomach
Making one for my roommate is also heartwarming~~ just kidding
01Features & Highlights
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Fluffy fabric, one side is skin-friendly, the other side has a pocket for hands and feet
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Temperature adjustable: Room temperature – 60℃ adjustable
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Temperature control via knob adjustment, auto heating after 3 seconds of inactivity
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Display screen shows real-time current temperature and target temperature
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Can be powered by a power bank, 10000mAh power bank, theoretically lasts 3-5 hours
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If there is no operation for 10 minutes, the heating pad automatically shuts off and needs to be manually restarted
Actual usage effect is as follows
Can accurately adjust temperature
Once the temperature is set, you can put your hands/feet inside~
I can’t imagine how warm it will be when I set it to 40 degrees in this pocket
The biggest highlight of the design is that it can dissipate heat
The author of the heating pad designed 2 PCBs for it, the design diagram is as follows.
02Circuit Design DiagramMain Control Board
Used for temperature control
Main control schematic
Power schematic
PCB Diagram
Heating Plate
Used for heating
Schematic
PCB Diagram
Hardware Parameters
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Main Control Chip: STM32F103, responsible for signal acquisition, computation, temperature control, and peripheral driving.
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EC11 knob sets the desired temperature, EC11 uses external interrupts and level readings to determine clockwise and counterclockwise rotation;
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10W heating PI film, uses MOS with PWM to control heating power output;
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The heating part uses PID temperature control adjustment, as the selected power is relatively small, it only starts to reduce power output when the temperature is 2 degrees away from the set temperature;
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The power section has a voltage trickle from the power bank or some chargers to 12V voltage, AMS steps down to 3.3V to power the microcontroller, the microcontroller uses LDO to step down to the required voltage;
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Enables timer counting, if there is no other operation for 10 minutes, it assumes the user has fallen asleep, and the heating pad shuts off output.
What do you think?
Do you have any additional thoughts on this open-source project?
Do you have any other “modification” directions?
Feel free to discuss in the comments!
If you want to replicate it and give a thumbs up to the author
just scroll down!
Welcome to replicate and learn
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03Open Source Website
Open source website: https://oshwhub.com/shelton2.0/arbitrary-warm-ow
Open source content:
Mobile version↓
If you also want to DIY, feel free to claim~
PCB Board Free Coupon: https://www.jlc.com/newOrder/#/collectCoupons?spm=JLC.MEMBER
3D Printing Free Coupon:: https://www.jlc-3dp.cn/freePrint
PI heating sheet 20 yuan special price sample description: https://www.jlc-drm.com/technical-documentation/48498?
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