Thermostat
About the Thermostat PCB
Thermostat is an open source ESP32 PCB design by kelvie, published on GitHub under the Apache-2.0 license. It is a 2-layer board measuring 52.5 × 95 mm, with 33 components from 25 distinct parts.
Its main chip is the ESP32-WROVER-E, from the ESP32 family. Other key parts include the TPS5430DDA, TPS62203DBV and LM324DT. By type, the board carries 10 resistors, 9 capacitors, 5 connectors, 4 ICs, 3 diodes and 2 inductors.
From the project
Random kicad experiments
Main components on the Thermostat
Thermostat bill of materials (BOM)
33 components, 25 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ESP32-WROVER-E | ESP32-WROVER-E | U1 |
| 1 | TPS5430DDA | TI_SO-PowerPAD-8_ThermalVias | U2 |
| 1 | TPS62203DBV | SOT-23-5 | U3 |
| 1 | LM324DT | SOIC-14_3.9x8.7mm_P1.27mm | U4 |
| 1 | 24VAC | TerminalBlock_RND_205-00001_1x02_P5.00mm_Horizontal | J1 |
| 1 | UART | PinHeader_1x04_P2.54mm_Horizontal | J2 |
| 1 | BOOT | PinHeader_1x02_P2.54mm_Horizontal | J3 |
| 1 | 12VDC | TerminalBlock_RND_205-00001_1x02_P5.00mm_Horizontal | J4 |
| 1 | CTRL | TerminalBlock_RND_205-00003_1x04_P5.00mm_Horizontal | J5 |
| 1 | ABS2 | Diode_Bridge_Diotec_ABS | D1 |
| 2 | SS34 | D_SOD-128 | D2, D3 |
| 2 | YPRH1207-270M | L_12x12mm_H8mm | L1, L2 |
| 1 | 4.7 uF | C_0805_2012Metric | C1 |
| 1 | 10 uF | C_0805_2012Metric | C2 |
| 3 | 470uF/50V | CP_Elec_6.3x7.7 | C3, C4, C5 |
| 1 | 100uF/25V | CP_Elec_6.3x7.7 | C6 |
| 1 | 0.1uF/5V | C_0201_0603Metric | C7 |
| 1 | 1uF/5V | C_0402_1005Metric | C8 |
| 1 | 0.01uF | C_0603_1608Metric | C9 |
| 3 | 33k | R_0201_0603Metric | R1, R2, R8 |
Show 5 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 68k | R_0201_0603Metric | R3, R4 |
| 1 | 18k | R_0201_0603Metric | R5 |
| 1 | 2k | R_0201_0603Metric | R6 |
| 1 | 10k | R_0201_0603Metric | R7 |
| 2 | 1.8k | R_0201_0603Metric | R9, R10 |
Thermostat design files
The KiCad project lives in the kelvie/kicads repository on GitHub; these links point at the commit this page was built from.
Thermostat: common questions
What microcontroller does the Thermostat use?
The Thermostat is built around the ESP32-WROVER-E, from the ESP32 family.
How big is the Thermostat PCB?
The Thermostat measures 52.5 × 95 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Thermostat?
33 components, from 25 distinct parts. The full bill of materials is listed on this page.
Where can I download the Thermostat design files?
From the kelvie/kicads repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Thermostat design in my own project?
Yes, under the terms of its Apache-2.0 license, which kelvie chose for the repository.
Can I test firmware for the Thermostat without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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