Tea Cozy Hotplate
About the Tea Cozy Hotplate PCB
Tea Cozy Hotplate is an open source STM32 PCB design by CDFER, published on GitHub under the Custom license 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 designs in this gallery.
From the project
Showcasing a collection of functional PCB business cards, each demonstrating a unique embedded electronics project.
Tea Cozy Hotplate =====================================
The Tea Cozy Hotplate is a temperature-controlled hotplate designed to keep your cup of tea at the perfect temperature. It features a compact design, precise temperature control, and a user-friendly interface.
Temperature control with ±2°C accuracy Compact design fits most tea cups User-friendly interface with addressable LED indicators Powered via USB-C connector (5V, 1.4A) * STM32F103C8T6 microcontroller with 72MHz CPU
Main components on the Tea Cozy Hotplate
Tea Cozy Hotplate 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 |
Tea Cozy Hotplate design files
The KiCad project lives in the CDFER/Business-Cards repository on GitHub; these links point at the commit this page was built from.
Tea Cozy Hotplate: common questions
What microcontroller does the Tea Cozy Hotplate use?
The Tea Cozy Hotplate is built around the MCU 72MHz STM32F103C8T6, from the STM32 family.
How big is the Tea Cozy Hotplate PCB?
The Tea Cozy Hotplate measures 93 × 57 mm, has 2 copper layers and is 0.99 mm thick.
How many components are on the Tea Cozy Hotplate?
104 components, from 42 distinct parts. The full bill of materials is listed on this page.
Where can I download the Tea Cozy Hotplate design files?
From the CDFER/Business-Cards repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Tea Cozy Hotplate design in my own project?
It is published under Custom license, which limits how it may be reused; read the license before building on it.
Can I test firmware for the Tea Cozy Hotplate 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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