DS18B20 1-WIRE TEMPERATURE SENSOR: Difference between revisions
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'''Command:''' | '''Command:''' | ||
<pre> | <pre> | ||
SET CUENOW:ON | SET CUENOW:ON | ||
</pre> | </pre> | ||
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'''Expected Response:''' | '''Expected Response:''' | ||
<pre> | <pre> | ||
IMEI: 862942074896044 | IMEI: 862942074896044 | ||
Command: SET CUENOW:ON | Command: SET CUENOW:ON | ||
Response: | Response: | ||
Error : 0 | Error : 0 | ||
</pre> | </pre> | ||
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'''Verification Command:''' | '''Verification Command:''' | ||
<pre> | <pre> | ||
GET CUENOW | GET CUENOW | ||
</pre> | </pre> | ||
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'''Expected Verification Response:''' | '''Expected Verification Response:''' | ||
<pre> | <pre> | ||
IMEI: 862942074896044 | IMEI: 862942074896044 | ||
Command: GET CUENOW | Command: GET CUENOW | ||
Response: ENOW:ON | Response: ENOW:ON | ||
Error : 0 | Error : 0 | ||
</pre> | </pre> | ||
== Step 2: Configure the 1-Wire Sensor Model == | == Step 2: Configure the 1-Wire Sensor Model == | ||
Latest revision as of 12:00, 11 November 2025
Introduction to the product
The DS18B20 is a digital temperature sensor created by Dallas Semiconductor (now part of Maxim Integrated). It uses a special 1-Wire® communication protocol. This protocol allows data transfer using just a single data line, which significantly reduces the number of required connections!
You can find this sensor in two main types:
- A TO-92 package that looks like a small transistor
- A waterproof probe that’s perfect for measuring temperatures in wet environments, underground, or places that are hard to reach
| Parameters | Value |
|---|---|
| Power Supply | 3V to 5.5V |
| Current Consumption | 1mA |
| Temperature Range | (-55 to 125°C) |
| Accuracy | ±0.5°C |
| Resolution | 9 to 12 bit (selectable) |
| Conversion Time | < 750ms |
Wiring
Configuration
Before configuring, ensure that the DS18B20 sensor(s) are connected to the Transight telematics device as per the sensor pinout. Improper wiring may lead to failed communication or sensor detection issues.
Step 1: Enable 1-Wire Sensor Interface
This command activates the 1-Wire port for sensor communication.
Command:
SET CUENOW:ON
Expected Response:
IMEI: 862942074896044 Command: SET CUENOW:ON Response: Error : 0
Verification Command:
GET CUENOW
Expected Verification Response:
IMEI: 862942074896044 Command: GET CUENOW Response: ENOW:ON Error : 0
Step 2: Configure the 1-Wire Sensor Model
This command sets the sensor model to DS18B20.
Command:
SET CUOWCFG:DS18B20
Expected Response:
IMEI: 862942074896044 Command: SET CUOWCFG:DS18B20 Response: Error : 0
Verification Command:
GET CUOWCFG
Expected Verification Response:
IMEI: 862942074896044 Command: GET CUOWCFG Response: OWCFG: DS18B20 Error : 0
Step 3: Specify the Number of Connected Sensors
Define the number of connected DS18B20 sensors. Maximum supported: 3.
Command:
SET CUOWNOS:1
- (Update the number `1` to `2` or `3` if more sensors are connected.)*
Expected Response:
IMEI: 862942074896044 Command: SET CUOWNOS:1 Response: Error : 0
Verification Command:
GET CUOWNOS
Expected Verification Response:
IMEI: 862942074896044 Command: GET CUOWNOS Response: TEMPERATURE SENSOR NOS: 1 Error : 0
⚠️ Mandatory Finalization Step
Apply and save the sensor settings.
Command:
SET CUMR:2
Post-Configuration Validation Checklist
Once configuration is completed, verify the data stream:
- 🔄 Monitor incoming packets from the device.
- 🌡️ Ensure temperature values are included in the payload.
- 📈 Confirm periodic updates from each connected sensor.
- ✅ Check the accuracy and consistency of readings.