Sensor monitoring device Tibbo Sentinel

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In our digital world, we often need to monitor various parameters of the environment. For example, in data centers or server farms, engineers are to check air temperature and humidity, the presence of the AC power, etc. to maintain the optimal operating mode of the hardware. Or, it may be a matter of necessity to monitor temperature, ambient light level and water leaks in a smart home. This is where Tibbo Sensor Monitoring Device (SMD) comes in handy.

Tibbo's hardware modular design and the untroubled ease of programming make TPB (Tibbo Project Box) platform ideal for building a device that monitors various sensors, not only those that measure environmental parameters, but, virtually, any sensor that reports digital or analog values.

Support for multiple protocols, such as ModBus and SNMP, allows seamless device integration into existing infrastructure. Numerous communication ports support major sensor types: RS232, RS485, Dry Contact, 1-wire, and I2C.

Our Sensor Monitoring Device (SMD) is based on Tibbo TPP3 G2 board, although it is possible to use smaller TPP2 PCB, thus limiting the number of supported features.

When a space saving installation is a matter of necessity, ultra-compact design gives Tibbo SMD an advantage over other products available on the market. Tibbo SMD can come complete with DIN Rail/Wall Mounting Kit for your convenience.

Tibbo SMD is a highly configurable device. Need more dry contacts but don't need I2C? Replace direct I/O lines tibbits with optoisolated inputs. Have no use for SMS notifications? Remove GPRS tibbit.

«Take what you need. Leave out what you don't!»

Tibbo's Line of Sensors

Building a sensor network can be a no-brainer if you use Tibbo sensors. We offer a broad line of sensor options, ranging from temperature and humidity sensors to ADC and accelerometers.

All Tibbo's sensors have an RS485 serial interface which enables you to install a sensor up to 1000 meters away from the sensing equipment. Sensors can be connected to a single port in a daisy-chain style, allowing to build cost-effective solutions. Each sensor has a strong plastic casing that can be attached to almost any surface using screws, two-sided scotch tape or plastic cable ties.

Our sensors are smart hardware. «Smart» means each sensor contains a peripheral interface controller, which runs their own firmware and reports the measured parameter(s) in a human readable format. Firmware can be upgraded at any time via a serial port. Sensors draw power directly from monitoring device, hence no external power supply is required.

Key Features


  • Open-source, distributed under LGPL license
  • Web interface for device monitoring and configuration
  • DHCP protocol support for dynamic network address configuration
  • SNMP protocol support, versions v1, and v2c
  • Notifications via SMS messages or SMTP (Tibbit #47 GPRS modem, with prepaid SIM-card is required for sending SMS messages)

  • Export for sensor values as XML or JSON file via HTTP protocol
  • ModBus and ModBus RTU support over serial lines or TCP/IP
  • Access control lists for IP-based access
  • Support for Green (good), Yellow (pre-alert) and Red (alert) zones for sensor values with selectable actions for such zones
  • Flexible configuration for custom hardware layouts


* RS232 port is usually used for device management and firmware upload, but it can be switched into RS485 mode via web-interface, thus allowing connection of ModBus or Tibbo original sensors
** 1-wire ports support, a.k.a. “single-wire” protocol (such as implemented in AM2301 humidity and temperature sensor). However, in this case multidrop feature for the port is disabled, because “single-wire” protocol doesn’t support device addressing
*** “Multidrop” means a daisy-chain style connection for sensors so that multiple devices can be connected sequentially to a single port.
**** RS485 port operates in half-duplex mode via single twisted pair. 120 Ohm terminator is required at the open end, especially for long lines.