RF & Wireless Systems · Hardware
WR-001 LoRa Wireless Alarm / Call Pager
The alarm in your pocket — everyone sees who acknowledged it.
Overview
The problem. In factories, hotels, warehouses and plants, getting an alarm (fire, intrusion, machine stop, customer call) to the person in charge depends on a siren and a light on the panel. That person is not always at the panel; phone/GSM notifications depend on coverage and apps, and they arrive late. When several staff members are on duty, nobody knows who is handling it, so the alarm is either handled twice or not at all.
The solution. WR-001 carries the alarm broadcast by the central unit (a panel or the Wireless Gateway / RTU) to the staff member's pocket over LoRa within seconds. The OLED shows the alarm code and its source, and a buzzer sounds. When the user acknowledges with OK, the ACK goes both to the central unit and, as a broadcast, to the other pagers; the central unit repeats it as ACK_RELAY, so pagers that were out of range are cleared too. The device normally sits in STOP mode while the radio listens with RX duty-cycling, aiming for low consumption and long battery life. Frequency, SF, power and address are set from the menu; a TX/RX test mode checks range during installation.
Works with. Alarms are generated by Elmes central units: Wireless Fire Alarm System (Firesens), Wireless Guard Patrol System, Wireless Waiter Call — Long Range and Wireless Call Button Platform. WR-001 is the pocket notification end of these systems; the text of the 8 alarm codes is defined per customer.
This product is in development or field testing. Contact us for technical information, pilot use and a preliminary quotation.
Features
- ACK broadcast and relay: a single acknowledgment clears every pager; the central unit sends ACK_RELAY to those out of range.
- 8 alarm codes with custom text: the code-to-text table lives in firmware and is defined per customer (Fire / Intrusion / Patrol round / Table 12 / Line 3 stop…).
- Low-power listening: SX1268 RX duty-cycling + CAD with the MCU in STOP mode; wake-up on a radio interrupt (DIO1) or a button press.
- Menu and test mode: frequency/SF/BW/power/address settings; TX test (selected alarm code), RX test (RSSI/SNR), buzzer test, battery status and firmware version. No separate tool is needed to check range during installation.
- Settings in Flash: stored as key-value pairs in the last sector and retained through power loss.
- TargetVibration and silent mode: vibration motor, silent mode and shift hours.
- TargetAlarm history and online list: the last 20 alarms on the pager; the central unit lists online pagers via PING.
- TargetOTA updates: firmware and alarm texts updated in the field (built on the Module Programming/Test Fixture + SDK Package).
- TargetSiren variant: a loud wireless siren/warning unit with a speaker driver.
- TargetDirect button profile: notifications sent straight from a Wireless Call Button Platform button to the pager.
- TargetNetID and AES-128: network ID and encryption with the move to the Elmes Module Series platform.
Variants
| Model code | Hardware | Display / alert | Battery | Status | Request information |
|---|---|---|---|---|---|
| WR-001 (R2) | STM32F070 + SX1268, 433 MHz | 128×64 OLED, buzzer, 5 buttons | Li-ion | Prototype (PCB R2) | Request information: WR-001 (R2) |
| WR-001-RS1 | Same hardware as R2; RS1 PCB variant | Same as R2 | Same as R2 | In design | Request information: WR-001-RS1 |
| WR-001-STarget | R2 + speaker / loud siren driver | OLED + siren | Larger battery | Planned | Request information: WR-001-S |
| WR-001-LPTarget | Built on the EM-G0L-433-LP battery LoRa node module (module series) | Same as R2 | CR123A / Li-ion | Planned | Request information: WR-001-LP |
Specifications
Values marked “Target” are design targets, next-generation values or chip-vendor data; they are updated as measurement and certification are completed.
| Frequency band | 433.000–434.790 MHz in 10 kHz steps via the menu; SX1268 |
|---|---|
| Channel setting | Continuous frequency setting via the menu |
| System channel plan | 8 channels; aligned with the Elmes module series channel planTarget |
| Output power | 0…+22 dBm adjustable (default +22 dBm) |
| Receiver sensitivity | −124 dBm @ SF7/BW125 … −137 dBm @ SF12 (SX1268 datasheet) |
| Modulation | LoRa SF7–12, BW 125/250/500 kHz, CR 4/5 |
| Data rate | 0.3–11 kbps (depending on SF/BW); packets ≤ 16 bytes |
| Antenna | Internal (PCB trace or helical); RF switch for TX/RXTarget |
| Open field | ≥ 1000 m (SF9, internal antenna, 1.5 m hand height)Target |
|---|---|
| Indoors | ≥ 150 m / 3 floors (SF9)Target |
| Packet framing | SyncWord + address + CRC8 + sequence number; no encryption in today's version |
|---|---|
| Encryption | AES-128 (with the move to the module series)Target |
| Addressing / capacity | 254 pagers + central unit; broadcast address 0xFF; 8 alarm codes |
| Pairing | Address assignment via the menu |
| Pager registry | Registered pager list on the central unitTarget |
| Separating systems on one site | Separation by frequency/SF; network separation by SyncWord |
| Independent networks per site | ≥ 8Target |
| Alarm latency | < 3 s (RX duty-cycle period 2–5 s + ~60 ms airtime @ SF7); < 200 ms with continuous RX in the emergency profileTarget |
|---|---|
| ACK propagation | 3 repeats with random back-off |
| ACK reaching all pagers | < 5 sTarget |
| Watchdog | IWDG (prescaler compatible with STOP mode) |
| Battery | Single-cell Li-ion; battery gauge 4.2 V = 100 %, 3.0 V = 0 % |
|---|---|
| Battery capacity | ≥ 1000 mAh (depending on the housing)Target |
| Standby consumption | < 50–100 µA average (MCU in STOP, SX1268 sleep 0.6 µA, RX duty-cycle average)Target |
| Alarm / TX current | ~15–30 mA in alarm mode (OLED + buzzer); 118 mA TX peak |
| Battery life | ≥ 7 days standby; ~400 days theoretical at 1000 mAh and 100 µA average, real life depends on alarm frequencyTarget |
| Charging | USBTarget |
| Display | SSD1306 128×64 OLED (I2C), 2 font sizes |
|---|---|
| Buttons | 5 buttons: Menu, Up, Down, OK, Back; 50 ms debounce, 1.5 s long press |
| Audible alert | Buzzer (push-pull drive, 2–4 kHz, 3 patterns: alarm / acknowledge / error) |
| Vibration alert | Vibration motorTarget |
| Service interface | SWD |
| UART service | Settings and OTA over UARTTarget |
| Housing | Handheld housing; 3D design ready |
|---|---|
| Carrying | Belt clipTarget |
| Ingress protection | IP54 (splash-proof)Target |
| Operating temperature | −10…+50 °C (Li-ion limit) |
| Storage temperature | −20…+60 °CTarget |
| Warranty | 2 years; the battery is a consumableTarget |
|---|---|
| Service | Ankara |
Applications
- Fire alarm notification
- Security and patrol
- Hotel and restaurant service calls
- Beach bar service
- Production line stops
- Operator and forklift calls
- Shift supervisors and maintenance
- Industrial fire system: notification end of the Wireless Fire Alarm System (Firesens) for shift supervisors, security and maintenance staff.
- Guard patrol / security: Intrusion / Fire / Patrol round alarms reach the patrol officer through the Wireless Guard Patrol System.
- Waiter / hotel calls: a pocket pager for the kitchen and service supervisor with Wireless Waiter Call — Long Range; beach bars.
- Machines / production: line stops, operator calls and forklift calls (Wireless Call Button Platform profile).
Planned profiles: next-driver notification at taxi ranks (Wireless Taxi Call System), lone-worker and panic-button notification.
Compliance & documentation
WR-001 is at the prototype stage and operates in the 433 MHz ISM band. Documentation is being prepared in stages together with the Elmes module series, following the plan below.
- TargetCE – RED 2014/53/EU (EN 300 220-2, EN 301 489-1/-3)In stages with the module series
- TargetEN 62368-1 — electrical and battery safety
- TargetBattery safety and transport documents (UN38.3 / IEC 62133, from the cell supplier)
- TargetRoHS declaration
- TargetCE declaration of conformity, datasheet, user manual and protocol document
- Out of scopeEN 54-25 — radio-linked components of fire detection systemsWR-001 is not a mandatory part of the fire system but an additional notification device; scope follows the Firesens system documentation.
Frequently asked questions
How many pagers can join one system?
254 (1-byte address). In practice, 5–50 pagers per site is typical.
Does the alarm clear on the other pagers when one person acknowledges it?
Yes. The ACK is broadcast to all pagers; the central unit forwards it as ACK_RELAY to those out of range.
How long does the battery last?
The standby consumption target is below 100 µA; real battery life depends on alarm frequency, OLED on-time and the SF setting. Measured results will be added to the specifications.
What is the range?
WR-001 is a handheld device with an internal antenna; the link budget is gained with the antenna at the central unit (Industrial RF Antenna Series). The target is ≥ 1 km in open field and several floors indoors. The RX test mode shows the actual value during installation.
Which systems does it work with?
With the Elmes central units that generate the alarm: Firesens, Guard Patrol, Waiter Call and the Wireless Call Button Platform. Third-party PLC connection is planned through the Wireless Gateway / RTU.
Can the alarm texts be changed?
Yes. The text of the 8 codes is defined in firmware per customer; OTA and UART support for changes in the field is planned.
What if a pager is dropped or fails?
In the planned version, the central unit flags a pager that stops answering PING as offline. A spare pager is programmed with the same address and put into service.
What about the warranty?
A 2-year warranty is planned; the battery is a consumable. Service is provided in Ankara.
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