TeaCupHotPlate
About the TeaCupHotPlate PCB
TeaCupHotPlate is an open source STM32 PCB design by Will946, published on GitHub under the MIT license. It is a 2-layer board measuring 93 × 57 mm, with 104 components from 42 distinct parts.
Its main chip is the MCU 72MHz STM32F103C8T6, from the STM32 family. Other key parts include the 8MHz 20pF ±10ppm, NMOS AO3400A and SM4007PL. By type, the board carries 36 capacitors, 33 resistors, 19 LEDs, 5 ICs, 3 switches and 2 fuses.
It belongs with the sensors and displays & leds designs in this gallery.
From the project
Keeps your tea at temperature by turning the circuit board itself into the heating element. Overengineered, like all good tea rituals.
Tea Cozy Hotplate =====================================
The Tea Cozy Hotplate is a USB-C powered, closed-loop temperature-controlled hotplate sized to sit under a single cup of tea. An STM32F103C8T6 ("Blue Pill" class MCU) reads a thermistor bonded to the underside of the heating coil, PWM drives two low-side NMOS switches to regulate power into a spiral PCB heater trace, and reports the current setpoint on a ten segment WS2812B ("Neopixel") LED bar that doubles as a 0 to 90 degrees C temperature dial. Two buttons let you nudge the setpoint up or down in 10 degree steps, and the whole board…
Main components on the TeaCupHotPlate
TeaCupHotPlate bill of materials (BOM)
104 components, 42 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MCU 72MHz STM32F103C8T6 | LQFP-48_L7.0-W7.0-P0.50-LS9.0-BL | U1 |
| 1 | 8MHz 20pF ±10ppm | CRYSTAL-SMD_L5.0-W3.2 | U2 |
| 2 | NMOS AO3400A | SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR | U3, U4 |
| 1 | SM4007PL | SOD-123F_L2.8-W1.8-LS3.7-RD | U5 |
| 1 | USB_C_Receptacle | TYPE-C-SMD_C9900025773 | J2 |
| 1 | SRV05 | SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BR | ESD1 |
| 2 | 1.5A Resettable Fuse | Fuse_1206_3216Metric | F1, F2 |
| 1 | LDO 3.3V 200mA XC6206P332MR | SOT-23-3_L2.9-W1.6-P1.90-LS2.8-BR | LDO1 |
| 3 | Button SPST 50mA 12V | SW-SMD_4P-L5.1-W5.1-P3.70-LS6.5-TL-2 | SW1, SW2, SW3 |
| 5 | 0603,Red | LED0603 | LED1, LED2, LED6, LED7, LED8 |
| 3 | 0603,Yellow | LED0603 | LED3, LED4, LED5 |
| 11 | XL-1615RGBC-WS2812B | LED-SMD_4P-L1.6-W1.5_XL-1615RGBC-WS2812B | RGB1, RGB2, RGB3, RGB4, RGB5, RGB6, RGB7, RGB8 +3 |
| 1 | 1N5819WS | SOD-323_L1.8-W1.3-LS2.5-RD | D1 |
| 1 | ZMM5V6 | LL-34_L3.5-W1.5-RD | D2 |
| 1 | 0805,800mA | 0805_2012Metric | FB1 |
| 2 | 0402CG200J500NT 0402,20pF,50V,C0G | 0402_1005Metric | C1, C6 |
| 15 | CL05B104KO5NNNC 100nF | 0402_1005Metric | C2, C4, C11, C16, C19, C20, C21, C22 +7 |
| 1 | CL21B105KBFNNNE 0805,1uF,50V,X7R | 0805_2012Metric | C3 |
| 3 | CL05A105KA5NQNC 0402,1uF,25V,X5R | 0402_1005Metric | C5, C30, C31 |
| 1 | CL05C331JB5NNNC 0402,330pF,50V,C0G | 0402_1005Metric | C7 |
Show 22 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | CL05A475MP5NRNC 0402,4.7uF,10V,X5R | 0402_1005Metric | C8, C18 |
| 4 | CL05C331JB5NNNC 330pF | 0402_1005Metric | C9, C10, C15, C17 |
| 2 | CL10B474KA8NNNC 0603,470nF,25V,X7R | 0603_1608Metric | C12, C14 |
| 1 | CL10C331JB8NNNC 0603,330pF,50V,C0G | 0603_1608Metric | C13 |
| 1 | CL05B103KB5NNNC 10nF | 0402_1005Metric | C32 |
| 1 | CL21B105KBFNNNE 1uF | 0805_2012Metric | C33 |
| 2 | CL05B104KO5NNNC 0402,100nF,16V,X7R | 0402_1005Metric | C34, C35 |
| 1 | 22uF 35V | CAP-SMD_BD5.0-L5.3-W5.3-LS6.0-FD | C60 |
| 1 | 0402WGF1004TCE 0402,1M | 0402_1005Metric | R1 |
| 2 | 0402WGF220JTCE 0402,22 | 0402_1005Metric | R2, R3 |
| 3 | 0402WGF4701TCE 0402,4.7k | 0402_1005Metric | R4, R20, R21 |
| 3 | 0402WGF1002TCE 0402,10k | 0402_1005Metric | R5, R26, R27 |
| 4 | 0402WGF1201TCE 0402,1.2k | 0402_1005Metric | R6, R15, R16, R22 |
| 1 | 0402WGF1500TCE 0402,150 | 0402_1005Metric | R7 |
| 4 | 0402WGF1003TCE 0402,100k | 0402_1005Metric | R8, R9, R19, R24 |
| 4 | 0402WGF1001TCE 0402,1k | 0402_1005Metric | R10, R11, R32, R33 |
| 2 | 0402WGF6800TCE 0402,680 | 0402_1005Metric | R12, R17 |
| 2 | 0402WGF5101TCE 0402,5.1k | 0402_1005Metric | R13, R14 |
| 1 | 0402WGF3300TCE 0402,330 | 0402_1005Metric | R18 |
| 2 | 0402WGF1000TCE 0402,100 | 0402_1005Metric | R23, R25 |
| 2 | 47k 3950K | R0402 | R28, R29 |
| 2 | 0402WGF4702TCE 0402,47k | 0402_1005Metric | R30, R31 |
TeaCupHotPlate design files
The KiCad project lives in the Will946/TeaCupHotPlate repository on GitHub; these links point at the commit this page was built from.
TeaCupHotPlate: common questions
What microcontroller does the TeaCupHotPlate use?
The TeaCupHotPlate is built around the MCU 72MHz STM32F103C8T6, from the STM32 family.
How big is the TeaCupHotPlate PCB?
The TeaCupHotPlate measures 93 × 57 mm, has 2 copper layers and is 0.99 mm thick.
How many components are on the TeaCupHotPlate?
104 components, from 42 distinct parts. The full bill of materials is listed on this page.
Where can I download the TeaCupHotPlate design files?
From the Will946/TeaCupHotPlate repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the TeaCupHotPlate design in my own project?
Yes, under the terms of its MIT license, which Will946 chose for the repository.
Can I test firmware for the TeaCupHotPlate without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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