2 layers90 × 60 mm
Thermostat bottom only
mbtown01/frosti
"Financially Reactive Open Source Thermostat Initiative" (FROSTI), a RaspberryPi-based hardware+software solution
32 parts2
2 layers94 × 72 mm
Thermostat
mbtown01/frosti2"Financially Reactive Open Source Thermostat Initiative" (FROSTI), a RaspberryPi-based hardware+software solution
- Size
- 94 × 72 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 65
- Nets
- 101
- Pads
- 386
- Tracks, vias
- 695, 45
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 13 Nov 2019
- Updated
- 29 Mar 2026
Overview
Thermostat is an open-source printed circuit board by mbtown01, from the mbtown01/frosti repository on GitHub. It is a 2-layer board of 94 × 72 mm with 65 parts on 101 nets, routed with 695 tracks and 45 vias.
It is built around the BME280, LM2596S-5.0 and CAT24C256LI, with the ULN2003AD, S1A and SS24 among its other parts. Its parts include 19 diodes, 16 resistors, 10 capacitors, 6 ICs and 5 connectors. It belongs with the home automation and IoT boards and the Raspberry Pi (Linux) boards of this library.
Main components
6
BME280
LGA-8(2.5x2.5)-40℃~+85℃ 0%RH~100%RH 1.71V~3.6V 1.8uA 16bit I2C、SPI ±0.5℃ ±3%RH LGA-8(2.5x2.5) Temperature and Humidity Sensor ROHSBoschTemperature And Humidity Sensor
LM2596S-5.0
TO-263-5-40℃~+125℃@(TJ) 1 150kHz 3A 4.5V~40V 5V 5mA Buck Buck Built-in Fixed No TO-263-5 DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
CAT24C256LI
PDIP-81,000,000 cycles 1.8V~5.5V 100 Years 256Kbit 400kHz 5ms Hardware write protection function、Noise suppression function、Built-in power-on reset (POR) I2C PDIP-8 EEPROM ROHSonsemiEEPROM
ULN2003AD
SOP-161.7V 15pF 30V 500mA 50V 50uA 50uA Seven channels SOIC-16 Darlington Transistor Arrays ROHSTexas InstrumentsDarlington Transistor Arrays
S1A
SMA(DO-214AC)1 Independent 1.1V@1A 1A 30A 50V 5uA@50V SMA(DO-214AC) Diodes - General Purpose ROHSDiodes IncorporatedDiodes - General PurposeSS24
SMA(DO-214AC)-55℃~+150℃ 200uA@40V 2A 40V 50A 550mV@2A Independent SMA(DO-214AC) Schottky Diodes ROHShongjiachengSchottky Diodes
README
README.mdFROSTI
FROSTI (the Financially Responsive Open-Source Thermostat Initiative) is a Raspberry Pi-based thermostat that monitors the current price of power on the electric grid and changes temperature targets to minimize power usage during periods of high prices.
Features
- Real-time monitoring of local power-price
- Web-based configuration
- 2.9" e-paper display clearly visible from a distance
- LED indicators for mode changes
- Full RESTful API for monitoring status and controlling from remote
Links
Parts
65| Qty | Value | Footprint | References |
|---|---|---|---|
| 16 | LTRB-RASF | Package_TO_SOT_SMD:SOT-23-6 | D1, D2, D3, D4, D6, D7, D8, D9, D11, D12, D13, D14, D16, D17, D18, D19 |
| 6 | 64 | Resistor_SMD:R_0805_2012Metric | R7, R8, R9, R10, R11, R12 |
| 5 | 10k | Resistor_SMD:R_0805_2012Metric | R3, R13, R14, R15, R16 |
| 5 | 1uF | Capacitor_SMD:C_0805_2012Metric | C1, C4, C6, C8, C9 |
| 3 | 7.3k | Resistor_SMD:R_0805_2012Metric | R1, R4, R5 |
| 3 | Button | Button_Switch_SMD:SW_SPST_EVPBF | SW1, SW2, SW3 |
| 2 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C2, C7 |
| 2 | 100uF/50V | Capacitor_SMD:C_Elec_8x10.2 | C3, C5 |
| 2 | 4.8k | Resistor_SMD:R_0805_2012Metric | R2, R6 |
| 2 | LP5024 | Package_DFN_QFN:QFN-32-1EP_4x4mm_P0.4mm_EP2.9x2.9mm | U1, U2 |
| 1 | 100nF | Capacitor_SMD:C_0805_2012Metric | C10 |
| 1 | 150uH | Inductor_SMD:L_Wuerth_WE-PD-Typ-M-Typ-S | L1 |
| 1 | BME280 | Package_LGA:Bosch_LGA-8_2.5x2.5mm_P0.65mm_ClockwisePinNumbering | U5 |
| 1 | CAT24C256 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mm | U4 |
| 1 | COOL | project_footprints:AGQ210A03 | RELAY2 |
| 1 | Conn_01x04 | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J2 |
| 1 | Conn_02x20_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical | CONN1 |
| 1 | E-PAPER DISPLAY | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J3 |
| 1 | FAN | project_footprints:AGQ210A03 | RELAY1 |
| 1 | Green | LED_SMD:LED_0805_2012Metric | D15 |
| 1 | HEAT | project_footprints:AGQ210A03 | RELAY3 |
| 1 | LM2596S-5 | Package_TO_SOT_SMD:TO-263-5_TabPin3 | IC1 |
| 1 | MAIN BOARD | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J5 |
| 1 | Mounting_Hole-Mechanical | project_footprints:oshw-logo-8_silkscreen-front_8mm | MK1 |
| 1 | RING BOARD | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | S1A | Diode_SMD:D_SOD-123F | D5 |
| 1 | SS24 | Diode_SMD:D_SMB | D10 |
| 1 | Screw_Terminal_01x05 | project_footprints:CUI_TB004-508-05BE | J1 |
| 1 | ULN2003AD | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U3 |
More from mbtown01/frosti
2- 2 layers56 × 37 mm
Dev test
mbtown01/frosti
"Financially Reactive Open Source Thermostat Initiative" (FROSTI), a RaspberryPi-based hardware+software solution
22 parts2
Similar boards
- 2 layers79.7 × 80 mm
Mainboardv1.2
doobedoobedo/Huebner_Inverter
KiCAD port of https://github.com/jsphuebner/inverter-hardware mainboard V1.2
133 parts1 - 2 layers
- 2 layers98.5 × 16 mm
- 2 layers130 × 75 mm
Aaron
alcaaron/esi_project
ENGINYERIA DE SISTEMES: PROJECTE DE CURS Fet per - Aaron Alcalá - Albert Bombí - Marcos García
64 parts - 4 layers100 × 100 mm
- 4 layers100 × 100 mm
- 2 layers90 × 34 mm
LoRa Node
TilenTinta/Greenhouse_LoRa_Node
An open-source monitoring system designed for use in greenhouses, orchards or other agricultural environments
78 parts2MIT - 4 layers85 × 100 mm
Questions
How big is the Thermostat PCB?
It measures 94 × 72 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Thermostat use?
65 parts, built around the BME280, LM2596S-5.0, CAT24C256LI and ULN2003AD. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Thermostat KiCad files?
From the mbtown01/frosti repository on GitHub, at the commit this page was made from: the board is kicad/thermostat.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Thermostat design in my own project?
Its repository states no licence, so its author keeps all rights: ask mbtown01 before reusing the design.