DS18B20 Waterproof Digital Temperature Sensor — Stainless Steel Probe
The DS18B20 waterproof probe encloses the Dallas DS18B20 temperature sensor in a stainless steel tube sealed with epoxy, making it submersible and suitable for liquid temperature measurement in aquariums, brewing systems, and soil probes. It communicates over Dallas One-Wire protocol, sharing a single digital pin with up to 64 sensors on one bus — each identified by its unique 64-bit serial number. Resolution is configurable from 9 to 12 bits, giving 0.0625°C per step at maximum resolution.
- -55°C to +125°C range — covers boiling water, frozen pipes, and soil
- 0.0625°C resolution at 12-bit mode
- One-Wire bus — up to 64 sensors on one digital pin
- Waterproof stainless steel probe — submersible, epoxy-sealed
- 3.0V–5.5V supply — parasitic or external power mode
- 1 metre cable — standard cable length
| Specification | Value |
|---|---|
| Sensor IC | DS18B20 (Maxim/Dallas) |
| Temperature range | -55°C to +125°C |
| Accuracy | +/-0.5°C (-10°C to +85°C) |
| Resolution | 9–12 bit (0.5°C to 0.0625°C) |
| Interface | One-Wire |
| Supply voltage | 3.0V – 5.5V |
| Cable length | 1 metre |
What resistor do you need for the DS18B20?
A 4.7k ohm pull-up resistor on the data line to VCC is required when operating in externally powered mode. In parasitic power mode (data pin powers the sensor), a stronger 2.2k ohm pull-up is recommended. Without the pull-up resistor, the sensor reads unreliably or returns -127°C as an error code.
How do you read multiple DS18B20 sensors from one pin?
All sensors connect data lines together to one Arduino pin with a single 4.7k pull-up. The DallasTemperature library by Miles Burton scans the bus, enumerates each sensor by address, and allows individual or simultaneous reading. Call sensors.requestTemperatures() then sensors.getTempCByIndex(0) for the first sensor.
Best for
Aquarium and fish tank temperature monitoring, homebrew fermentation temperature control, central heating pipe temperature logging, outdoor weather stations, soil temperature probes, hot tub and spa controls, and multi-point temperature mapping.
Why Kunkune
Shipped from UK stock. 60-day returns, no minimum order. Fast Royal Mail delivery.
For relay-switched temperature control — heating or cooling — the W1209 thermostat module uses a similar NTC probe and controls up to 10A at 240V AC.
Buying in bulk? For orders of 10+ units, contact us for trade pricing.
