WO2006119666A1

WO2006119666A1 - Wireless sense unit and signal transmission method and application thereof

Info

Publication number: WO2006119666A1
Application number: PCT/CN2005/000646
Authority: WO
Inventors: Tien-Cheng Huang
Original assignee: Holbright Weighing Systems Co., Ltd
Priority date: 2005-05-10
Filing date: 2005-05-10
Publication date: 2006-11-16

Abstract

A kind of wireless sense unit, is made up of the sensor, the analog/digital signal converter and the transceiver, they are all fixed on the same engine block. Wherein the sensor is connected with the analog/digital signal converter, it converts the sensitive value of the sensor to the digital signal, and after the far end receiver completing the clock synchronization, repeats playing digital signal in single direction at predetermine time slot by switching different frequencies, meanwhile make the far end receiver receive the signal which comes from the different wireless sense unitary in one to many mode, and identifies individual signal source using the time-slot assignment of the received signal, then separately stores, operates, prints and displays these digital signal. This wireless sense unit can repeat playing signal in single direction at different frequencies, form the simple and reliable wireless transmittal mode, can be directly used in the laboratory, plant, incinerator, platform balance station, cask gutter balance and other use requiring to collect the differ sensor read value by far end receiver.

Description

Wireless sensing unit and signal transmission method and application thereof

The present invention relates to a wireless sensing unit and a method for collecting signal transmission thereof, and more particularly to an analog unit that repeatedly transmits a digital signal representing its sensed value in a single direction at different frequencies in a plurality of specific time slots.

Background technique

At present, the wireless network of home and small and medium-sized enterprises adopts the IEEE 802.11 wireless local area network standard, and its physical layer (PHY) transmission technology is generally divided into IEEE 802. lib and IEEE 802.11a. The IEEE 802. lib data rate includes 1, 2, 5·5 and 11 Mbps, and the frequency band used is 2.4 GHz to 2. 4835 GHz. In this frequency band, 14 partially overlapping channels (channel s) are planned. Considering the problem of inter-channel interference, up to three mutually exclusive channels can be used simultaneously without interference. In contrast, the IEEE 802.11a data rate includes 6, 12, 18, 24, 36, 48, and 54 Mbps, and the frequency band is 5.15 GHz to 5.35 GHz and 5. 725 GHz to 5. 825 GHz, where There are 12 channels.

The foregoing conventional wireless communication device is a "many-to-many" transmission relationship. To ensure that a large number of busy wireless signal packets in a space are not mis-transmitted, misreceived, reversed, or lost, each signal packet must pass through. Filtering and returning for two-way confirmation are considered complete, and the process is quite complicated. Compared with the transmission and collection of various sensor data, such as laboratories, factories, incinerators, weighbridge stations, barrel scales, etc., it is a "many-to-one" or "one-to-many" transmission relationship, and it is barely applicable to the above tradition. The wireless communication device and method seem to be unnecessary, and the user's wireless network environment is interfering with factors, unable to reduce components and reduce installation costs. For this reason, for the wireless transmission of sensing elements and the collection of data, it is advisable to further develop a simpler and more reliable signal transmission method. Summary of the invention

In view of this, the main object of the present invention is to provide a wireless sensing unit capable of directly performing digitization of its sensing value and clock synchronization and transmission of a wireless signal directly in advance. The plurality of time slots are allocated, and the different frequencies are switched to unidirectionally and repeatedly transmit digital signals for a remote receiver to collect, store, calculate, print or display in a "one-to-many" transmission relationship.

According to the wireless sensing unit embodiment of the present invention, a sensor, an analog/digital signal converter and a transceiver can be installed by using the same body; wherein the sensor is connected to the analog/digital signal converter. For converting the sensed value on the sensor into a digital signal, and after synchronizing the clock with a remote receiver, repeating the unidirectional repetition at different frequencies in the pre-scheduled time slot. The terminal receiver receives the signal in a "one-to-many," transmission relationship. The remote receiver uses the time slot in which the signal is received to identify individual signal sources, and then stores, computes, prints, and displays the digital signals separately.

The wireless sensing unit can repeat the one-way wireless transmission signal in a one-to-many or many-to-one manner, which is simple and reliable, can reduce the installation cost of the device, and is suitable for laboratories, factories, incinerators, floor scale stations, barrel scales and Other uses require remote receivers to collect values from different sensor readings. DRAWINGS

1 is a block diagram showing the steps of a signal transmission method of the present invention;

3 is a schematic diagram and a block diagram of a wireless sensing unit implemented by the present invention applied to a weighbridge station;

4 is a schematic diagram of a configuration of a wireless sensing unit applied to a weighbridge station according to the present invention; FIG. 5 is a schematic structural view of a wireless sensing unit applied to a load cell according to the present invention; FIG. 6 is a wireless sensing unit application implemented by the present invention. FIG. 7 is a schematic diagram of the configuration of the wireless sensing unit applied to the barrel scale or the barrel bin according to the present invention;

8 is a schematic diagram of a remote receiver configured by a wireless sensing unit implemented by the present invention. The main component symbol description:

Al, A2, A3, A4, A5, A6, A7, A8 steps Bl, B2, B3 steps

LSI, LS2, LS3, LS4 . .. digital signal

TOO, Tl l, T12, T13, T14 . Time slots

Til, T12, T13, T14 time slots

T21, T22, T23, T24 time slots

T31, T32, T33, T34 time slots

10 Weighbridge Station

20 .... load cell

20A, 20B, 20C, 20D wireless sensing unit

20E, 2 OF wireless sensing unit

21 load sensor

22 digital transceiver

221 analog / digital signal converter

222 transceiver

30 remote receiver

31 wireless signal receiver

32 digital signal processor

33 output device

34 Electronic storage media

40 barrel scale

41 bracket

50 solar power generation unit

51 battery

detailed description

Referring to FIG. 1, the wireless sensing unit signal transmission method of the present invention includes the following processing steps:

In step A1, a time slot of a wireless sensing unit is allocated, and the clock pulse of the transceiver is The clock pulse of a remote receiver is synchronized. Each wireless sensing unit can be assigned a plurality of time slots, such as a first predetermined time slot, a second predetermined time slot, a third predetermined time slot, and an nth predetermined time slot.

In step A2, the sensing value of the wireless sensing unit is converted into a digital signal. The sensed value may be a value representing a load, a temperature, a pressure, a displacement, a chemical concentration, or other optical, electrical (voltage, current) or physical state (illuminance), depending on the sensing of the wireless sensing unit. Depending on the function of the device.

In step A3, the digital signal is transmitted at the first transmission frequency in the first predetermined time slot.

In step A4, the digital signal is retransmitted at the second predetermined frequency slot at the second transmission frequency. In step A5, the digital signal is retransmitted at the third predetermined frequency slot at the third transmission frequency. And so on, the digital signal is retransmitted at the nth transmission frequency at the nth predetermined time slot in the An step. With each retransmission, the frequency in the space is prevented from interfering with the reception of the remote receiver.

The remote receiver can perform the following steps in a one-to-many manner:

In step A6, the remote receiver is reset to zero to receive digital signals from different wireless sensing units from each time slot in a one-to-many manner.

In step A8, the source of the digital signal is identified according to the time slot, and the digital signal is stored to cover the previous digital signal with a new arrival.

Of course, a comparison step A7 can be added between the steps A6 and A8 to compare the digital signals transmitted from the time slots of the same sensor. If the new arrival is the same as the previous digital signal, it should be discarded or ignored. The newly arrived digital signal is not stored.

Referring next to Figure 2, an embodiment of a remote receiver 30 is illustrated in a one-to-many manner in pre-assigned time slots T00, Tl l, T12, T13, T14 Τ 21, Τ 22, Τ 23, Τ 24 Τ 31,

Τ32, Τ33, Τ34 perform the above steps of transmitting signals, wherein the time slot TOO synchronizes the clock pulses of the transceivers of each of the wireless sensing units 20A, 20B, 20C and 20D with the clock pulses of a remote receiver. Then, the time slots T1 l, T21, T31 are allocated for the wireless sensing unit 20 to transmit its digital signal LSI, and the time slots T12, Τ22, Τ32 are allocated for the wireless sensing unit 20 to transmit its number. The signal LS2, the assigned time slots T13, Τ23, Τ33 for the wireless sensing unit 2QC to transmit its digital signal LS3, the assigned time slots Τ14, Τ24, Τ34 for the wireless sensing unit 20D to transmit its digital signal LS4, and received by the remote receiver 30 for storage.

Referring to the schematic diagrams of FIG. 3 and FIG. 4, the foregoing wireless sensing units 20A, 20B, 20C, and 20D may be loaded with a load cell (LOAD CELLS) device at a scale station 10, when performing the weighbridge, respectively. The digital signals LS1, LS2, LS3, and LS4 representing the individual loads are transmitted, and the unidirectional transmission is repeated to the remote receiver 30 through a preset time slot.

Initially, the remote receiver 30 performs the B1 step to receive the digital signals LS1, LS2, LS3 of the different frequencies transmitted by the respective wireless sensing units 20A, 20B, 20C and 20D in each time slot in a one-to-many manner. LS4; then, performing step B2, each of the digital signal to identify the time slots assigned by LSI, LS2, LS3 and LS4 of the source, respectively, for the storage or update the wireless sensor units 20A, 20B, 20C and a load of ² 0D sensing value Wl , , W3 and W4; Finally, perform step B3, summing the load sensing values Wl, W3, and W4 to become the pounding result W of the weighbridge station.

As shown in FIG. 5, the wireless sensing unit application of the present invention is illustrated by taking a load cell ²⁰ as an example. A load sensor 21 and a digital transceiver 22 are mounted in the same body. The digital transceiver T1 can be composed of an analog/digital signal converter 221 and a transceiver 222. The load sensor 21 is connected to the analog/digital signal converter 221 for converting the load reading value on the load sensor 21 into a digital signal, and after synchronizing the clock with the remote receiver 30, The pre-assigned time slot repeatedly plays the load-reading digital signal in one direction and at different frequencies. Repeat the broadcast with different frequencies to prevent the frequency receiver of the environment from affecting the reception of the remote receiver 30. Using the time slot segmentation, the remote receiver 30 will be able to collect and discern digital signals from different load cells 20 in a one-to-many manner and then store, calculate, print or display.

Of course, the use of the wireless sensing unit of the present invention includes, but is not limited to, the load unit 20, such as replacing the load sensor 21 with a temperature sensor, a chemical concentration sensor, or detecting other physical and optical states. The detector is also available. In addition, the power of the wireless sensing unit can be general commercial power, or it can be supplemented or replaced by wind energy, solar energy, fuel cells or other new energy sources. As shown in Figure 6, The solar power generation device 50 converts sunlight into electric energy, and the battery 51 stores the power supply to the wireless sensing units 20A, 20B of the platform 10 in the figure. The storage device is connected to the bracket 41 to sense the load change wireless sensing unit 20A, 20B, 20C, 20D, 20E, 20F, which is sent to the remote receiver 30 for storage, calculation, printing or according to the signal transmission method of the present invention. Display and other processing and application.

As shown in FIG. 8, the remote receiver 30 can include a wireless signal receiver 31, a digital signal processor 32, and an output device 33. The wireless signal receiver 31 distinguishes digital signals from different wireless sensing units by using different time slots, and outputs them by the output device 33 after arithmetic processing. The output device 33 can be a printer, a digital weight display, a screen or an e-mail device or a network connection device. In addition to the output device 33, the processing results of the digital signal processor 32 can also be loaded or directly loaded with the electronic storage medium 34, including a hard disk for a computer, a magnetic disk, a magnetic tape, a recordable optical disk, or a removable memory.

It can be seen from the above description that the wireless sensing unit of the present invention repeatedly plays its sensing signals unidirectionally in different time slots at different frequencies, which is different from the traditional many-to-many wireless communication protocol, and the simple and reliable wireless transmission mode. It is especially suitable for use in laboratories, factories, incinerators, weighbridges, tanks and other applications where remote sensors need to be used to collect readings from different sensors.

The drawings and the descriptions disclosed above are merely examples of the invention, and are not intended to limit the embodiments. Any other person who is familiar with the art, other equivalent changes or modifications made in accordance with the description of the present invention should be construed within the scope of the patent application of the present application.

Claims

Claim

A wireless sensing unit, characterized in that a sensor, an analog/digital signal converter and a transceiver are mounted in the same body; wherein the sensor is connected to the analog/digital signal converter And converting the sensing value on the sensor into a digital signal, and after performing clock synchronization with a remote receiver, respectively switching the different frequencies in multiple time slots to repeatedly transmit the number signal.

2. The wireless sensing unit according to claim 1, wherein the digital signal is repeatedly transmitted outward in a plurality of sets of time slots set in advance.

3. The wireless sensing unit according to claim 2, wherein the remote receiver uses the plurality of time slots set in advance to identify individual signal sources, and stores the digital signals separately. , calculation, printing and display.

4. The wireless sensing unit according to claim 1, wherein the sensor is a sensor for sensing any one of load, temperature, pressure, displacement, concentration, voltage, current, and illuminance. .

The wireless sensing unit according to claim 1, wherein a first time slot, a second time slot, and a third time slot are preset, and the digital signal is sent out according to the following steps: Having the clock pulse of the transceiver therein synchronized with the clock pulse of the remote receiver; converting the sensed value to a digital signal;

Transmitting the digital signal at the first transmission frequency in the first time slot;

Retransmitting the digital signal at the second transmission frequency in the second time slot; and

The digital signal is retransmitted at the third time slot at the third time slot.

6. The wireless sensing unit of claim 1, wherein a plurality of time slots are preset, including first to nth time slots, and a clock pulse of the transceiver therein is The clock of the terminal receiver is synchronized, and the digital signal is sent out according to the following steps:

Converting the sensed value to a digital signal; Selecting a transmission frequency at the first time slot to transmit the digital signal;

Retransmitting the digital signal at the second time slot at a different transmission frequency than the previous one; retransmitting the digital signal at the third time slot at a different transmission frequency than previously;

And so on, and re-transmitting the digital signal at the nth time slot at a different transmission frequency than before.

7. The wireless sensing unit of claim 1 , wherein the plurality of wireless sensing units respectively emit a number representing the load when the weighbridge performs a weighbridge; A signal is sent to the remote receiver.

8. The wireless sensing unit of claim 7, wherein the remote receiver sums the load represented by the digital signals transmitted by the plurality of wireless sensing units to generate a floor scale of the scale station. result.

9. The wireless sensing unit of claim 1 , wherein the plurality of devices are arranged in a plurality of slots to transmit a digital signal representative of the load to the remote receiver.

The wireless sensing unit according to claim 9, wherein the remote receiver sums the load represented by the digital signals transmitted by the plurality of wireless sensing units to generate the scale of the barrel scale result.

11. The wireless sensing unit of claim 1, wherein the remote receiver comprises a wireless signal receiver, a digital signal processor, and an output device.

The wireless sensing unit according to claim 11, wherein the wireless signal receiver distinguishes a source of the digital signal by using a difference in time slots.

The wireless sensing unit according to claim 11, wherein the output device is any one of a printer, a digital weight display, a screen, a sending email device, or a network connecting device. Kind.

The wireless sensor unit of claim 11, wherein the remote receiver further comprises an electronic storage medium; the electronic storage medium can be a computer hard disk, Any of a disk, a tape, a recordable disc, or an extractable memory.