4 layers40 × 70 mm
DAQv3 5
TPierceUCSD/Wireless-motion-capture-data-sycnhronization-system
© 2025 Taylor Pierce, Emerson Noble, Lucas Davis, Jesus Wilkins, Kenneth J. Loh. Licensed under CC BY 4.0.
54 parts
4 layers23 × 31.3 mm
Temperature node
cegea/temperature_node_hwPCB design for a temperature sensor based on SHT and ESP32
- Size
- 23 × 31.3 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 36
- Nets
- 33
- Pads
- 138
- Tracks, vias
- 230, 58
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 18 Oct 2024
- Updated
- 18 Nov 2024
Overview
Temperature node is an open-source printed circuit board by cegea, from the cegea/temperature_node_hw repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 23 × 31.3 mm with 36 parts on 33 nets, routed with 230 tracks and 58 vias.
It is built around the ESP32-C3-WROOM-02-H4, SHT40-AD1B-R3 and MIC5504-3.3YM5, with the USBLC6-2P6, S2B-PH-SM4-TB and WS2812B-2020 among its other parts. Its parts include 11 resistors, 9 capacitors, 5 ICs, 2 connectors and 1 diode. It belongs with the ESP32 and RISC-V boards of this library.
Main components
6
ESP32-C3-WROOM-02-H4
SMD,20x18mm-105dBm -40℃~+105℃ 2.4GHz 20.5dBm 345mA 3V~3.6V 82mA Bluetooth5.0 ESP32-C3 On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,20x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
SHT40-AD1B-R3
DFN-4-EP(1.5x1.5)-40℃~+125℃ 0%RH~100%RH 1.08V~3.6V 16bit 400nA Built-in heater I2C ±0.2℃ ±1.8%RH DFN-4-EP(1.5x1.5) Temperature and Humidity Sensor ROHSSensirionUncategorised
MIC5504-3.3YM5
SOT-23-5-40℃~+125℃@(Tj) 1 120uVrms 15uA 180mV@(300mA) 3.3V 300mA 5.5V 75dB@(1kHz) Fixed Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
USBLC6-2P6
SOT-666-6-40℃~+125℃ 150nA 17V 2 3.5pF 5.25V 5A@8/20us 6V ESD IEC 61000-4-2 Unidirectional SOT-666-6 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
S2B-PH-SM4-TB
2A 100V, Pitch 2.0mm, 2 Positions Disconnectable Crimp Style, SMD Male Header, Side EntryJSTUncategorised
WS2812B-2020
SMD,2.2x2mm0.6mA 0.84mm 120us 160mcd 200mcd 2kHz 2mm 2mm 300ns 470.4nm 515.6nm 520mcd 5V 622.5nm 800Kbit/s Built-in power-on reset circuit、Built-in power-on reset circuit、Integrated intelligent reverse connection protection function Top-mount SMD,2.2x2mm RGB LEDs(Built-in IC) ROHSWorldsemiRGB LEDs(Built-In IC)
README
README.mdTemperature node
PCB design for a temperature sensor based on SHT and ESP32.
Requirement Specifications
- Battery Operated: The node should operate on a battery with a lifespan of over a month.
- WiFi Connection: Supports 2.4 GHz WiFi to connect to a home network.
- MQTT Protocol: Publishes temperature and humidity data to an MQTT broker.
- Compact Design: Designed for easy placement in various locations around the home.
- Temperature and Humidity Reporting: Uses an SHT series sensor for accurate measurements.
Functional Requirements Specification
Electrical
- Battery Life: Should last more than a month on a single charge.
- Power Consumption: Optimized deep-sleep mode for low power consumption between readings.
- Input Voltage: 3.3V for ESP32 and 3V to 5V compatible for SHT sensors.
- Charging: Option for USB-C charging or solar panel for extended battery life.
- Voltage Regulation: Include a voltage regulator to ensure stable power delivery to ESP32 and the sensor.
Mechanical
- Enclosure: IP65-rated enclosure for dust and water resistance if placed in areas prone to moisture.
- Size: Compact size, around 5cm x 5cm x 3cm, to fit easily on shelves or mounted on walls.
- Mounting (Optional): Option for wall mounting with screw holes or adhesive backing.
- Internal Antenna: PCB antenna for better WiFi range within the home.
- Access Ports: A small access port for USB charging and maintenance.
Functional
- Data Reporting Interval: Configurable reporting interval (e.g., every 5 minutes, 10 minutes) to balance battery life and data frequency.
- Low Battery Alert: Sends an MQTT message when the battery level falls below a certain threshold.
- Temperature Range: Measures temperature from -20°C to +60°C.
- Humidity Range: Measures humidity from 0% to 100% relative humidity.
- OTA Updates: Supports Over-the-Air (OTA) firmware updates to improve functionality without physical access.
- Reconnection Logic: Automatically attempts to reconnect to WiFi and MQTT broker in case of network loss.
- Local Data Storage: Stores data temporarily in case of WiFi disconnection and uploads when the connection is restored.
Parts
36| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2, R3, R4, R5, R10, R11 |
| 3 | 100n | Capacitor_SMD:C_0402_1005Metric | C1, C3, C8 |
| 3 | 1u | Capacitor_SMD:C_0402_1005Metric | C2, C5, C7 |
| 2 | 100k | Resistor_SMD:R_0402_1005Metric | R7, R8 |
| 2 | 4u7 | Capacitor_SMD:C_0603_1608Metric | C6, C9 |
| 2 | 5k1 | Resistor_SMD:R_0402_1005Metric | R6, R9 |
| 1 | +BATT | TestPoint:TestPoint_Pad_D1.0mm | TP8 |
| 1 | 10u | Capacitor_SMD:C_0805_2012Metric | C4 |
| 1 | 3V3 | TestPoint:TestPoint_Pad_D1.0mm | TP3 |
| 1 | ESP32-C3-WROOM-02 | RF_Module:ESP32-C3-WROOM-02 | U1 |
| 1 | GND | TestPoint:TestPoint_Pad_D1.0mm | TP5 |
| 1 | IO9 | TestPoint:TestPoint_Pad_D1.0mm | TP7 |
| 1 | MCP73831-2-OT | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | MIC5504-3.3YM5 | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | RX | TestPoint:TestPoint_Pad_D1.0mm | TP1 |
| 1 | S2B-PH-SM4-TB | Connector_JST:JST_PH_S2B-PH-SM4-TB_1x02-1MP_P2.00mm_Horizontal | CN2 |
| 1 | SHT40-AD1B-R3 | Sensor_Humidity:Sensirion_DFN-4_1.5x1.5mm_P0.8mm_SHT4x_NoCentralPad | U2 |
| 1 | SHT_EN | TestPoint:TestPoint_Pad_D1.0mm | TP2 |
| 1 | TX | TestPoint:TestPoint_Pad_D1.0mm | TP4 |
| 1 | USBLC6-2P6 | Package_TO_SOT_SMD:SOT-666 | U4 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4110 | CN1 |
| 1 | VBUS | TestPoint:TestPoint_Pad_D1.0mm | TP6 |
| 1 | WS2812B-2020 | LED_SMD:LED_WS2812B-2020_PLCC4_2.0x2.0mm | D1 |
Questions
How big is the Temperature node PCB?
It measures 23 × 31.3 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Temperature node use?
36 parts, built around the ESP32-C3-WROOM-02-H4, SHT40-AD1B-R3, MIC5504-3.3YM5 and USBLC6-2P6. 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 Temperature node KiCad files?
From the cegea/temperature_node_hw repository on GitHub, at the commit this page was made from: the board is temperature_node/temperature_node/temperature_node.kicad_pcb and its schematic temperature_node/temperature_node/temperature_node.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Temperature node design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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