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industrial · by osei · 52 clones

Cold-room temperature log

A waterproof probe inside the cold room logs temperature and alerts when it leaves the safe range. About $39 in parts.

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Parts

  • ESP32-S3-DevKitC-1 (N8R8) C-001$19.95
  • DS18B20 Waterproof Temperature Probe P-002$9.95
  • USB-C 5.1 V 3 A Power Supply E-005$8.74

Parts $38.64 · powered by the USB-C 5.1 V 3 A Power Supply

  • Note: The USB-C 5.1 V 3 A Power Supply's plug (usb-c-v1) doesn't fit the ESP32-S3-DevKitC-1 (N8R8)'s port (usb-micro-b-v1). You'll need an adapter cable, which isn't in the parts list.

Wiring

The volts are the parts' own: the USB-C 5.1 V 3 A Power Supply puts out 4.845–5.355 V, and the ESP32-S3-DevKitC-1 (N8R8)'s regulator makes the 3.251–3.349 V rail its GPIO and most of the sensors run from. Which header pin each lead lands on is our suggestion — the registry has no pin map, and nothing here has been wired on a bench.

Power the board off while you plug anything in. Every connector here is keyed: if it doesn't click in easily, turn it over rather than forcing it.

USB-C 5.1 V 3 A Power SupplyE-005 · out 4.845–5.355 VUSB Type-C≤3000 mA4.845–5.355 VportESP32-S3-DevKitC-1 (N8R8)C-001 · in 4.13–5.5 V3V3 rail 3.251–3.349 V · ≤800 mAGPIO logic 3.3 V · USB Micro-BUSB Micro-BDS18B20 Waterproof Temperature ProbeP-002 · One-Wire · sees 3.251–3.349 V3V33.251–3.349 V1 VCCGND2 GNDGPIO5One-Wire3 SIGloose ends →V+ · redGND · blackSDA · blueSCL · yellowsignal · orangeconnectors →USBJST PH 2.0 mmheader pinESP32-S3-DevKitC-1 (N8R8) GPIO are 3.3 V only — do not wire a signal to the 5V rail.
  • Note: One-Wire needs a 4.7 kΩ pull-up from the data line to VCC. It isn't in the parts list.

Readings

What this build sends: one column per channel its parts read or drive, with the unit the capability carries. The values and times below are sample data.

Sample data, one row every 5 min, in the shape the channel would arrive in — not a reading from a built device.
TimeCold-room temp °CP-002
2.1
2.3
2.6
3.1
3.4
2.9