2 layers36 × 58 mm
Ups adaptor
aronreid/ups-to-esp32
Put a USB-only UPS on the network: an ESP32-S3 board and firmware that serves NUT on TCP 3493, with a web UI. No host computer, no Raspberry Pi.
38 parts130GPL-3.0
2 layers20 × 64.5 mm
Cadence sensor
TanmayChhatbar/cadence_sensorWIP
- Size
- 20 × 64.5 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 41
- Nets
- 67
- Pads
- 209
- Tracks, vias
- 402, 54
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 23 Sep 2024
- Updated
- 31 Oct 2024
Overview
Cadence sensor is an open-source printed circuit board by TanmayChhatbar, from the TanmayChhatbar/cadence_sensor repository on GitHub, published under the GPL-3.0 licence. It is a 2-layer board of 20 × 64.5 mm with 41 parts on 67 nets, routed with 402 tracks and 54 vias.
It is built around the ESP32-S3-WROOM-1-N4, TPD4E05U06DQAR and ICM-42670-P. Its parts include 13 capacitors, 6 resistors, 4 diodes, 3 ICs and 3 connectors. It belongs with the sensors and measurement boards and the ESP32 boards of this library.
Main components
3
ESP32-S3-WROOM-1-N4
SMD,25.5x18mm-103.5dBm -40℃~+85℃ 2.4GHz 20.5dBm 355mA 3V~3.6V 95mA Bluetooth5.0 ESP32-S3 On-board PCB Antenna UART、SPI、I2C、GPIO、I2S、USB SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
TPD4E05U06DQAR
USON-10-40℃~+125℃ 0.5pF 10nA 14V 2.5A@8/20us 40W@8/20us 5.5V 6.5V ESD Four channels IEC 61000-4-2、IEC 61000-4-5、IEC 61000-4-4 Unidirectional USON-10(1x2.5) ESD and Surge Protection (TVS/ESD) ROHSTexas InstrumentsESD Protection Devices
ICM-42670-P
LGA-14(2.5x3)-40℃~+85℃ 1.71V~3.6V 16bit 2.25KB 3.5uA IMU (accelerometer + gyroscope) Motion event detection SPI、I2C、I3C X,Y,Z X,Y,Z ±16g ±2000dps LGA-14(2.5x3) Accelerometers ROHSTDK InvenSenseAccelerometers
README
README.mdBREAKING FLAW - The BMW output current is insufficient for the ESP32
(WIP) ESP32 Accelerometer-Based Sensor with Wireless Display Integration
Overview
This project involves the development of a compact, low-power sensor unit using an ESP32 microcontroller integrated with an accelerometer and powered by a 3.7V LiPo cell, which can be charged using solar energy. The sensor unit wirelessly transmits data over BLE. The system is designed for measuring the cadence when riding a bicycle for live telemetry, with low energy consumption and a tiny form factor.
Features
- ESP32-Based Sensor Unit: Equipped with an accelerometer to capture motion data.
- Power Options: 3.7V LiPo.
- Charging Options: USB or Solar
- Wireless Data Transmission: Utilizes Bluetooth Low Energy (BLE) for communication between the sensor unit and the display unit.
- Low Power Consumption: Optimized for energy efficiency, suitable for long-term operation on minimal power. The device will go into sleep mode in case of inactivity.
Components
- ESP32-S3-WROOM-1 Microcontroller: The core of the system, handling both sensor data collection and wireless communication.
- ICM-42670-P Accelerometer: Detects and measures acceleration in three axes.
- BQ25570 BMS: For voltage regulation for the circuit and battery charging.
Setup and Installation
-
Hardware Setup
- Assemble the ESP32 with the accelerometer and choose either the button cell or solar cell for power.
- Connect to ESP32 with Bluetooth.
-
Software Setup
- Flash the ESP32 with the provided codebase.
- The sensor unit will continuously monitor the accelerometer data and send it via BLE to the display unit.
- The display unit will process and visualize the received data.
Usage
- The sensor unit will send data, and the display unit will show the live accelerometer readings.
PCB Design
Below is the image of the PCB design, showcasing the layout of the components for the sensor unit.
Future Improvements
- Integration of additional sensors (e.g., gyroscope).
- Enhanced power management strategies for longer battery life.
- Expansion to support multiple sensor units communicating with a single display.
Parts
41| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 0.1uF | Capacitor_SMD:C_1206_3216Metric | C2, C4, C15 |
| 2 | 1uF | Capacitor_SMD:C_1206_3216Metric | C1, C9 |
| 2 | 22uF | Capacitor_SMD:C_1206_3216Metric | C10, C12 |
| 2 | 4.7uF | Capacitor_SMD:C_1206_3216Metric | C11, C14 |
| 2 | 5K1 | Resistor_SMD:R_1206_3216Metric | R4, R9 |
| 2 | 8M2 | Resistor_SMD:R_1206_3216Metric | ROUT2, ROV2 |
| 2 | D_Schottky | Diode_SMD:D_SOD-123 | D5, D7 |
| 1 | .01uF | Capacitor_SMD:C_1206_3216Metric | C13 |
| 1 | 0.01uF | Capacitor_SMD:C_1206_3216Metric | C5 |
| 1 | 100uF | Capacitor_SMD:C_1206_3216Metric | C8 |
| 1 | 10K | Resistor_SMD:R_1206_3216Metric | R6 |
| 1 | 15R | Resistor_SMD:R_1206_3216Metric | R5 |
| 1 | 1K | Resistor_SMD:R_1206_3216Metric | R8 |
| 1 | 2.2uF | Capacitor_SMD:C_1206_3216Metric | C3 |
| 1 | 22uH | Inductor_SMD:L_1206_3216Metric | L2 |
| 1 | 3V3 | TestPoint:TestPoint_Pad_D2.0mm | TP1 |
| 1 | 4.7uH | Inductor_SMD:L_1206_3216Metric | L3 |
| 1 | 4M7 | Resistor_SMD:R_1206_3216Metric | ROUT1 |
| 1 | 5M1 | Resistor_SMD:R_1206_3216Metric | ROV1 |
| 1 | 68R | Resistor_SMD:R_1206_3216Metric | R7 |
| 1 | BQ25570 | Package_DFN_QFN:QFN-20-1EP_3.5x3.5mm_P0.5mm_EP2x2mm | U7 |
| 1 | ESP32-S3-WROOM-1-N4 | ESP32_S3_WROOM_1_N4:XCVR_ESP32-S3-WROOM-1-N4 | U1 |
| 1 | GND | TestPoint:TestPoint_Pad_D2.0mm | TP2 |
| 1 | ICM-42670-P | ICM_42670_P:XDCR_ICM-42670-P | MT1 |
| 1 | JST_BATT | Connector_JST:JST_XH_S2B-XH-A-1_1x02_P2.50mm_Horizontal | J2 |
| 1 | JST_SOL | Connector_JST:JST_XH_S2B-XH-A-1_1x02_P2.50mm_Horizontal | J4 |
| 1 | LED_G | Diode_SMD:D_1206_3216Metric | D3 |
| 1 | LED_R | Diode_SMD:D_1206_3216Metric | D4 |
| 1 | SOL | Jumper:SolderJumper-2_P1.3mm_Open_RoundedPad1.0x1.5mm | JP1 |
| 1 | SW_PWR | switch:switch-MSK-12C02-smd | SW2 |
| 1 | SW_Push | Button_Switch_SMD:SW_Push_SPST_NO_Alps_SKRK | SW1 |
| 1 | TPD4E05U06DQA | Package_SON:USON-10_2.5x1.0mm_P0.5mm | U2 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4110 | J1 |
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Questions
How big is the Cadence sensor PCB?
It measures 20 × 64.5 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Cadence sensor use?
41 parts, built around the ESP32-S3-WROOM-1-N4, TPD4E05U06DQAR and ICM-42670-P. 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 Cadence sensor KiCad files?
From the TanmayChhatbar/cadence_sensor repository on GitHub, at the commit this page was made from: the board is KiCAD/cadence sensor.kicad_pcb and its schematic KiCAD/cadence sensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Cadence sensor 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).