Huidu HD-S70 Seven Elements Sensor Overview
The Huidu HD-S70 is a seven-element environmental sensor transmitter in a louvered housing. It measures temperature, relative humidity, PM2.5, PM10, noise, atmospheric pressure and illuminance, then sends readings through an RS485 interface using Modbus RTU. It is suited to environmental monitoring installations and LED display projects that need these measurements. Confirm the receiving controller’s RS485 and protocol support before ordering.
What Does the HD-S70 Measure?
| Measurement | Specified range |
|---|---|
| Temperature | −40 to +120 °C |
| Relative humidity | 0–99% RH |
| PM2.5 and PM10 | 0–1,000 µg/m³ each; 1 µg/m³ resolution |
| Noise | 30–120 dB |
| Atmospheric pressure | 0–120 kPa |
| Illuminance | 0–200,000 lux |
These are measurement ranges, not accuracy guarantees. Consult the specification for accuracy, response times and installation conditions.
RS485 Modbus RTU Integration
The HD-S70 provides RS485 output with Modbus RTU communication. The Huidu specification lists a factory-default address of 0x01 and 4,800 bit/s baud rate, with 2,400 and 9,600 bit/s configurable. When several devices share one bus, use unique addresses and check A/B wiring. Huidu reports a measured maximum communication distance of 2,000 m; actual reach depends on cable and installation conditions.
Power-supply check: Huidu documentation differs by revision. The English V4.2 PDF linked below specifies 10–30 V DC, while the manufacturer’s Chinese V4.3 PDF specifies 5 V DC. Check the label and documentation for the exact unit supplied before connecting power.
HD-S70 Size and Documents
The original product dimension image and English specification are retained below. For revision-specific details, also consult the manufacturer’s HD-S70 V4.3 specification.
Download specification: Huidu HD-S70 Seven Elements Sensor Specification (English V4.2)
Frequently Asked Questions
Does the HD-S70 measure wind speed or wind direction?
No. Huidu lists those measurements for the HD-S90, not the seven-element HD-S70.
Can the HD-S70 connect to any LED controller?
Compatibility depends on the controller’s RS485 interface, supported Modbus data mapping and power requirements. Check the controller documentation or contact us with the controller model and sensor revision before purchase.
Conclusion
Choose the HD-S70 when one RS485 sensor is needed for seven environmental readings. Confirm the exact unit’s supply voltage and controller compatibility before installation.
