Temperature and Humidity Sensor Node Design

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Built the schematic-level design and project files for the rugged outdoor ESP32-C3 field display/logger.
Completed:
  • Renamed/described the project.
  • Added project specification, power budget, and firmware starter files.
  • Selected and added the ESP32-C3 SuperMini, BMP280, SH1107 OLED FPC connector, MT3608 boost module, MP1584EN buck module, reverse-polarity P-FET, controls, headers, LED, passives, and mounting holes.
  • Wired the major power, I²C, SPI OLED, encoder, LED, ADC divider, and decoupling networks.
  • Ran an ERC review pass; no matching ERROR/WARNING items were returned at that point.
  • Created firmware starter code for PlatformIO/Arduino with BMP280, SH1107 display, battery ADC, encoders, Wi-Fi reconnect, and low-battery handling.
Known limitations / remaining work:
  • Exact mini‑Tamiya footprint was not found; the schematic uses a 2-pin battery connector placeholder that should be replaced with the correct mini‑Tamiya part/footprint.
  • The ESP32-C3 SuperMini library symbol used here does not expose EN/RST, so the tactile reset is implemented as a firmware reset request on GPIO9 rather than a true hardware reset.
  • GPIOs are tight; encoder 2 switch shares the reset-request/OLED-reset net, which should be reviewed if separate reset and encoder-button behavior is mandatory.
  • Before layout, a fresh review pass should be run again, any remaining pin/net naming issues cleaned up, and the exact battery connector/reset strategy finalized.
Fix battery connector
Find reset-capable ESP32
Separate shared GPIO
Run design review
Set board outline
J2
U2 GND - U2 SDO
U1 GND - J2 07
U2 GND - U2 SDO
GND
U1 GND - J2 07
GND
U2 GND - U2 SDO
U4 OUTPUT- - U2 GND
J1 12 - J4 1
J1 12 - J4 1
U2 SDI - R4 P2
SW1 1 - C4 P1
U2 SDI - R4 P2
J1 2 - U1 GPIO7
U2 VDDIO - U2 CSB
U2 SCK - R10 P2
U1 GPIO2 - J2 03
U2 SCK - R10 P2
U3 VOUT+ - J1 11
U2 VDDIO - U2 CSB
U2 VDDIO - U2 CSB
SW2 1-2 - J5 5
U1 GPIO3 - J2 04
J1 3 - U1 GPIO6
U1 GPIO9 - J3 05
U1 GPIO9 - J3 05
J6 1 - Q1 D
U1 GPIO0 - J2 01
U1 GPIO3 - J2 04
U2 VDDIO - U2 CSB
U1 GPIO10 - J3 06
U1 GPIO20 - J3 07
U1 GPIO21 - J3 08
U2 SDI - R4 P2
U2 SCK - R10 P2
U1 GPIO0 - J2 01
U2 VDDIO - U2 CSB
U1 GPIO8 - J3 04
J1 10 - C13 P1
J1 3 - U1 GPIO6
U4 OUTPUT+ - C6 P1
U1 GPIO3 - J2 04
J1 2 - U1 GPIO7
U1 GPIO1 - J2 02
U1 GPIO2 - J2 03
J1 7 - R6 P1
U1 GPIO1 - J2 02
U1 GPIO9 - J3 05
J6
U2
SW2
U1
SW1
J1
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Rugged Outdoor Field Display Unit 567e

Rugged Outdoor Field Display Unit 567e thumbnail
Compact rugged handheld outdoor field-data display/logger with ESP32-C3 WiFi/BLE, transparent PMOLED, BMP280, dual encoders, and protected 2S LiPo power.

Properties

7.4 V nominal 2S LiPo battery via mini Tamiya connector; protected switched input; buck and boost daughter modules

2S LiPo input 6.4-8.4 V; 5 V buck rail; 13.5 V boost rail; 3.3 V logic rail

Compact <=60 x 40 mm rugged field display/logger with socketed modules/headers, conformal-coating-friendly layout, vibration-tolerant mounting

Transparent PMOLED display, dual KY-040 rotary encoders with push buttons, status LED, reset button

Wi-Fi 802.11 b/g/n and BLE 5.0 via ESP32-C3 SuperMini

Consumer / Hobbyist Outdoor Electronics

-20 C to +50 C

Pricing & Availability

Distributor

Qty 1

Arrow

$3.51–$3.79

Digi-Key

$6.31–$7.00

HQonline

$6.87

LCSC

$12.27

Mouser

$4.78

TME

$2.19

Verical

$9.43–$11.37

Controls