HB100 Doppler radar: specs and pinout
An X-band bi-static Doppler transceiver (dielectric resonator oscillator, single balanced mixer, antenna arrays). Its only output is a low-level analog IF signal, not a digital motion flag; the listing calls it a motion sensor module, but the maker sheet shows no motion output.
Specs
| Spec | Value | Source |
|---|---|---|
| Supply voltage VIN | 4.75 V min, 5.00 V typ, 5.25 V max | source Technical Specifications table (p.2) |
| Current consumption | 30 mA typ, 40 mA max | source Technical Specifications table (p.2) |
| Operating temperature | -15 to 55 C | source Technical Specifications table (p.2) |
| Operating frequency | 10.52 GHz min, 10.525 GHz typ, 10.53 GHz max | source Technical Specifications table (p.2) |
| Radiated power EIRP | 20 dBm typ | source Technical Specifications table (p.2) |
| Antenna beam-width (3 dB), X x Y | 80 x 40 degrees typ | source Technical Specifications table (p.2) |
| Output | IF analog output (pin named IF) | source Module Outline pin table (p.2) and block diagram (p.1) |
| Dimensions | 46.5 x 40.0 x 8.7 mm | source Technical Specifications table (p.2) |
| Recommended pulse scheme (pulse mode) | 2 kHz pulse frequency, 2 % duty cycle | source Recommended Pulse Scheme rows (p.2) |
Power
| Value | Source | |
|---|---|---|
| Supply | 5 V DC (4.75-5.25 V) | source Technical Specifications table and note under it (p.2) |
| Current | 30 mA typ, 40 mA max (CW operation, 5 V, 12 kOhm load, 25 C) | source Technical Specifications table and note under it (p.2) |
Pinout
Pin names come from the maker's HB100 product data sheet (ST Engineering AgilSense, V2.02). The data sheet is for the AgilSense HB100; a third-party module may be a look-alike, so check the printed labels on your board.
| Pin | Function | Voltage | Notes | Source |
|---|---|---|---|---|
| 5V | Supply voltage, VIN | 4.75-5.25 V | source Module Outline (p.2) | |
| IF | IFout (analog signal) | source Module Outline (p.2) | ||
| GND | Ground | The block diagram shows two GND pads | source Module Outline (p.2), block diagram (p.1) |
Build with it
Project ideas for the HB100 Doppler radar. Each link opens Soldr with the prompt filled in; Soldr assigns the pins, checks power and shows how to wire every part.
- Doppler activity meter: Run the module from the 5 V pin. AC-couple the IF pin through a capacitor into a half-supply bias (two equal resistors) ahead of the LM358 stage, because the IF signal swings both ways around its baseline and a single-supply op-amp cannot go below ground. The sheet gives no IF level, so start with low gain and tune by experiment. The op-amp output cannot reach the supply rail, so keep the signal well inside 0-5 V. Learning project. Radar senses people: use only where occupants know and consent.
- Radar signal on OLED: Power the module from the 5 V pin and run the op-amp from 3.3 V so its output cannot exceed the ADC range. Bias the stage at about 1.65 V (half of 3.3 V). AC-couple the IF pin through a capacitor into a half-supply bias (two equal resistors) ahead of the LM358 stage, because the IF signal swings both ways around its baseline and a single-supply op-amp cannot go below ground. The sheet gives no IF level, so start with low gain and tune by experiment. The op-amp output swings only part of the way to 3.3 V. Radar senses people: use only where occupants know and consent.
- Moving-object trigger: The sketch compares the amplified, AC-coupled signal with a threshold you set by experiment. AC-couple the IF pin through a capacitor into a half-supply bias (two equal resistors) ahead of the LM358 stage, because the IF signal swings both ways around its baseline and a single-supply op-amp cannot go below ground. The sheet gives no IF level, so start with low gain and tune by experiment. Learning project; not a security device. Radar senses people: use only where occupants know and consent.
Common mistakes
- Powering it from 3.3 V: the sheet specifies 4.75-5.25 V VIN (source)
- Expecting a ready-made digital output: the module has only an IF analog pin; the sheet gives no IF amplitude, so an amplifier stage and signal processing are needed (source: link, Module Outline p.2)
- Ignoring handling: the sheet marks it as an electrostatic sensitive device (source: link, Note 2 p.2)
Not covered by the official source
- The data sheet gives no IF output amplitude or Doppler-to-speed factor, so none is stated.
- Listing may be a third-party HB100-type module; module-level differences are not documented.
- The IF output swings above and below its own baseline and the sheet gives no DC level, so the ideas AC-couple it and add a half-supply bias; the op-amp output is limited below its supply (general note, not from the sheet).
Sources
- link (HB100 X-band Microwave Sensor Module product data sheet, V2.02, 2022, ST Engineering Electronics / AgilSense)