2 layers24.1 × 36.2 mm
Esp32miniBT
asterics/esp32_mouse_keyboard
ESP32 implementation for HID over GATT Keyboard and Mouse (Bluetooth Low Energy). Including serial API for external modules (similar to Adafruit EZKey HID)
28 parts911GPL-3.0
2 layers24.8 × 37.8 mm
Esp environment sensors
festlv/esp32-temperature-humidity-sensor2Yet another WiFi temperature/humidity sensor
- Size
- 24.8 × 37.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 22
- Nets
- 42
- Pads
- 99
- Tracks, vias
- 256, 26
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20170123)
- Created
- 27 Dec 2017
- Updated
- 27 Dec 2017
Overview
Esp environment sensors is an open-source printed circuit board by festlv, from the festlv/esp32-temperature-humidity-sensor repository on GitHub, published under the MIT licence. It is a 2-layer board of 24.8 × 37.8 mm with 22 parts on 42 nets, routed with 256 tracks and 26 vias.
It is built around the ESP32-WROOM-32. Its parts include 7 resistors, 6 capacitors, 4 connectors, 3 ICs and 1 diode. It belongs with the radio and wireless and sensors and measurement boards and the ESP32 boards of this library.
Main components
1README
README.mdESP32 environment sensor
This project encompasses hardware and firmware for a WiFi-enabled temperature and humidity sensor. It has a battery life of ~3 months on a single lithium-ion battery (3000mAh), by reporting temperature and humidity every 15 minutes.
Documentation is a little bit sparse, as this project is for my personal use.
Recommended hardware changes
After rev1 hardware was built, I realized a few things:
- Either don't use resistor divider to measure battery voltage, or connect it only when awake via transistor (it consumes ~25uA).
- Change MIC5504 voltage regulator to one with less leakage current- it consumes ~40uA.
Pictures
Parts
22| Qty | Value | Footprint | References |
|---|---|---|---|
| 3 | 1uF | Capacitors_SMD:C_0603 | C1, C2, C6 |
| 2 | 0.1uF | Capacitors_SMD:C_0603 | C4, C5 |
| 2 | 10K | Resistors_SMD:R_0603 | R3, R4 |
| 2 | 2K2 | Resistors_SMD:R_0603 | R6, R7 |
| 1 | 100K | Resistors_SMD:R_0603 | R2 |
| 1 | 220R | Resistors_SMD:R_0603 | R5 |
| 1 | 22uF | Capacitors_SMD:C_0805 | C3 |
| 1 | 47K | Resistors_SMD:R_0603 | R1 |
| 1 | BTN0 | Buttons_Switches_SMD:SW_SPST_EVQPE1 | SW1 |
| 1 | CONN_JTAG | pin_headers_1.27mm:Pin_Header_1.27mm_2x5 | P2 |
| 1 | DBG | Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm | P3 |
| 1 | ESP32-WROOM | ESP32-footprints-Lib:ESP32-WROOM | U2 |
| 1 | LED | Diodes_SMD:D_0603 | D1 |
| 1 | MIC5504 | TO_SOT_Packages_SMD:SOT-23-5 | U1 |
| 1 | PWR | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | P1 |
| 1 | SB_NC | solder_bridges:SB_NC | J1 |
| 1 | Si7021 | Housings_DFN_QFN:DFN-6-1EP_3x3mm_Pitch0.95mm | U3 |
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Questions
How big is the Esp environment sensors PCB?
It measures 24.8 × 37.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Esp environment sensors use?
22 parts, built around the ESP32-WROOM-32. 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 Esp environment sensors KiCad files?
From the festlv/esp32-temperature-humidity-sensor repository on GitHub, at the commit this page was made from: the board is hw/esp-environment-sensors.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Esp environment sensors design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).