Wireless electronic scale

Abstract

The utility model discloses a wireless electronic scale, which belongs to the technical field of metering, comprises a power supply module, a weighing unit and a communication unit, solves the technical problem of wireless data uploading of the electronic scale, guarantees the system stability through the power supply isolation and voltage stabilization design, improves the cruising ability and the charging safety of equipment, and improves the safety of the electronic scale. A weighing sensor is combined with an amplifier and a high-precision ADC module, the weighing precision can be effectively improved, weighing data are transmitted in real time through a wireless module, the system is suitable for long-distance real-time monitoring scenes, the reliability and timeliness of the data are ensured, automatic identification and recording are achieved, errors caused by manual input are avoided, and the system is divided into a weighing unit and a communication unit. The modular design enables the system to be easy to maintain and expand, new function modules can be added according to requirements, it is ensured that data cannot be lost due to communication interruption, the LCD screen displays weighing information in real time, rapid confirmation by field personnel is facilitated, and the operation efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of measurement, and in particular relates to a wireless electronic scale. Background Art

[0002] With the development of IoT technology, the logistics and warehousing industries are increasingly demanding intelligent management. Wireless electronic scales, as automated equipment, can achieve efficient and accurate data collection while reducing labor costs, making them particularly suitable for cargo tracking and inventory management.

[0003] Traditional electronic scales are not easy to carry and do not have wireless transmission capabilities. Utility Model Content

[0004] The purpose of the utility model is to provide a wireless electronic scale, which solves the technical problem of wireless uploading of data of the electronic scale.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A wireless electronic scale includes a power module, a weighing unit and a communication unit. The weighing unit and the communication unit communicate with each other via a serial bus. The power module supplies power to the weighing unit and the communication unit. The weighing unit is connected to an external weighing sensor.

[0007] The power module outputs two 5V power supplies, one is +5VA power supply and the other is +5VB power supply;

[0008] The weighing unit includes a first power isolator, a first LDO voltage regulator, a first communication interface, an NFC reader, an ADC module, an amplifier, a first MCU, and a first indicator light. The first communication interface, the NFC reader, the ADC module, and the first indicator light are all connected to the first MCU. The input end of the first power isolator is connected to a +5VA power supply, and the output end is connected to the input end of the first LDO voltage regulator. The output end of the first LDO voltage regulator supplies power to the NFC reader, the ADC module, the first MCU, and the first indicator light. The ADC module is connected to the amplifier, and the amplifier is connected to an external weighing sensor.

[0009] The communication unit includes a second power isolator, a lithium battery pack, a battery management chip, a DC-DC module, a second LDO regulator, a second communication interface, a second indicator light, a second MCU, a Flash memory, a button group, a Lora module, an LCD and a clock battery. The second communication interface, the second indicator light, the Flash memory, the button group, the Lora module, the LCD and the clock battery are all connected to the second MCU.

[0010] The input end of the second power isolator is connected to the +5VB power supply, and the output end is connected to the battery management chip. The battery management chip is also connected to the lithium battery pack and the DC-DC module respectively. The DC-DC module is connected to the second LDO regulator. The second LDO regulator supplies power to the second communication interface, the second indicator light, the Flash memory, the button group, the Lora module, the LCD, the clock battery, and the second MCU.

[0011] The first communication interface and the second communication interface communicate via a serial bus.

[0012] Preferably, the power supply module includes an AC-DC module IC1, a capacitor C1, a capacitor C2, a TVS tube TVS1, a diode D1, a diode D2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6. The L terminal and the N terminal of the AC-DC module IC1 are respectively connected to the live wire and the neutral wire of the mains, the +Vo terminal and the -Vo terminal output a +5V power supply and a ground wire respectively. The capacitor C1 and the capacitor C2 are filter capacitors between the +Vo terminal and the -Vo terminal of the AC-DC module IC1. The TVS tube TVS1 is connected between the +Vo terminal and the -Vo terminal of the AC-DC module IC1.

[0013] The anode of diode D1 and the anode of diode D2 are both connected to a +5V power supply, the cathode of diode D2 outputs a +5VA power supply, the cathode of diode D1 outputs a +5VB power supply, capacitors C3 and C4 are filter capacitors for the cathode of diode D2, and capacitors C5 and C6 are filter capacitors for the cathode of diode D1.

[0014] Preferably, the model of the first MCU is STM32F030C8T6, and the first MCU is connected to the first communication interface via a UART interface;

[0015] The NFC reader is a PN532 model, and the NFC reader is connected to the first MCU via an I2C bus;

[0016] The model of the ADC module is ADS1115, and the ADC module is connected to the first MCU via an I2C bus;

[0017] The amplifier model is AD623. The differential input of the amplifier is connected to the differential output of the external weighing sensor, and the output of the amplifier is connected to an analog input of the ADC module.

[0018] The model of the first power isolator is NNV25-05S05A3NT. The input end of the first power isolator is connected to the +5VA power supply, and the output end is connected to the input end of the first LDO voltage regulator. The model of the first LDO voltage regulator is AMS1117-3.3.

[0019] The first indicator light is LED lamp LED1, and the first MCU is connected to the LED lamp LED1 through an IO port;

[0020] The model of the external load cell is ZZ010-025.

[0021] Preferably, the model of the second MCU is STM32L476RG, and the second MCU is connected to the second communication interface via a UART interface;

[0022] The model of the Flash memory is W25Q32JV, and the Flash memory is connected to the second MCU via an SPI bus;

[0023] The model of the Lora module is RAK811. The Lora module is connected to the second MCU via a UART interface.

[0024] The LCD model is ST7789, and the LCD is connected to the second MCU via the SPI interface;

[0025] The second indicator light is LED light LED2, and the second MCU is connected to the LED light LED2 through an IO port;

[0026] The button group includes 4 buttons, and the 4 buttons are controlled by the 4 IO ports of the second MCU respectively;

[0027] The model of the second power isolator is NNV25-05S05A3NT. The input end of the first power isolator is connected to the +5VB power supply, and the output end is connected to the input end of the battery management chip;

[0028] The model of the battery management chip is BQ24030, and the lithium battery pack is connected to the BAT terminal of the battery management chip;

[0029] The output end of the battery management chip is connected to the input end of the second LDO voltage regulator; the model of the second LDO voltage regulator is TPS73633.

[0030] The wireless electronic scale described in this utility model solves the technical problem of wireless data uploading of electronic scales. The utility model uses an amplifier and a high-precision ADC module to improve the measurement accuracy of the weighing sensor, ensuring data accuracy. The data is transmitted over long distances through the LoRa wireless module without the need for complex wiring, facilitating real-time monitoring of the weight of items over a large range. The power isolator, LDO, and DC-DC modules jointly optimize system power management, and in conjunction with the lithium battery and battery management chip, extend the device's battery life. The Flash memory in the communication unit can store weighing data for a long time. The LCD screen can display the weighing and device status in real time for easy on-site viewing. The integrated NFC reader can read the NFC tag information of items. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a general principle diagram block diagram of the utility model;

[0032] Figure 2 It is a block diagram of the principle diagram of the weighing unit of the utility model;

[0033] Figure 3 It is a block diagram of the principle diagram of the communication unit of the present utility model;

[0034] Figure 4 This is a schematic diagram of the interface of the weighing unit of the utility model;

[0035] Figure 5 This is a schematic diagram of the interface of the communication unit of the present utility model;

[0036] Figure 6 It is a circuit diagram of the power module of the utility model. DETAILED DESCRIPTION

[0037] like Figures 1-6 A wireless electronic scale shown includes a power module, a weighing unit and a communication unit. The weighing unit and the communication unit communicate via a serial bus. The power module supplies power to the weighing unit and the communication unit. The weighing unit is connected to an external weighing sensor.

[0038] The power module outputs two 5V power supplies, one is +5VA power supply and the other is +5VB power supply;

[0039] The power supply module includes an AC-DC module IC1, a capacitor C1, a capacitor C2, a TVS tube TVS1, a diode D1, a diode D2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6. The L terminal and the N terminal of the AC-DC module IC1 are respectively connected to the live wire and the neutral wire of the mains, and the +Vo terminal and the -Vo terminal output a +5V power supply and a ground wire respectively. The capacitor C1 and the capacitor C2 are filter capacitors between the +Vo terminal and the -Vo terminal of the AC-DC module IC1. The TVS tube TVS1 is connected between the +Vo terminal and the -Vo terminal of the AC-DC module IC1.

[0040] The anode of diode D1 and the anode of diode D2 are both connected to a +5V power supply, the cathode of diode D2 outputs a +5VA power supply, the cathode of diode D1 outputs a +5VB power supply, capacitors C3 and C4 are filter capacitors for the cathode of diode D2, and capacitors C5 and C6 are filter capacitors for the cathode of diode D1.

[0041] In this embodiment, the AC power supply module converts the power supply into two independent 5V DC outputs, supplying the weighing unit and the communication unit respectively. The weighing unit's power isolator outputs a stable +5VA voltage to an LDO regulator, which further converts it to a stable 3.3V voltage for components such as the MCU1, NFC reader, and ADC module. The communication unit also uses an independent, isolated and regulated +5VB power supply, minimizing interference and ensuring stable power supply.

[0042] The weighing unit includes a first power isolator, a first LDO voltage regulator, a first communication interface, an NFC reader, an ADC module, an amplifier, a first MCU, and a first indicator light. The first communication interface, the NFC reader, the ADC module, and the first indicator light are all connected to the first MCU. The input end of the first power isolator is connected to a +5VA power supply, and the output end is connected to the input end of the first LDO voltage regulator. The output end of the first LDO voltage regulator supplies power to the NFC reader, the ADC module, the first MCU, and the first indicator light. The ADC module is connected to the amplifier, and the amplifier is connected to an external weighing sensor.

[0043] The model of the first MCU is STM32F030C8T6, and the first MCU is connected to the first communication interface via a UART interface;

[0044] In this embodiment, the first communication interface is interface COM1, the TX end of interface COM1 is connected to the PA2 port of the first MCU, and the RX end is connected to the PA3 port of the first MCU. The PA2 port and the PA3 port are a UART port of the first MCU.

[0045] The NFC reader is a PN532 model, and the NFC reader is connected to the first MCU via an I2C bus;

[0046] The SDA and SCL terminals of PN532 are connected to the PB7 and PB6 ports of the first MCU respectively.

[0047] The PN532 is powered by the 3.3VA output of the first LDO regulator.

[0048] The model of the ADC module is ADS1115, and the ADC module is connected to the first MCU via an I2C bus;

[0049] The SDA and SCL terminals of ADS1115 are connected to the PB5 and PB4 ports of the first MCU respectively. The ADS1115 is powered by a 3.3VA power supply. The AIN0 terminal of ADS1115 is connected to the output terminal OUT of the amplifier AD623.

[0050] The amplifier model is AD623. The differential input of the amplifier is connected to the differential output of the external weighing sensor, and the output of the amplifier is connected to an analog input of the ADC module.

[0051] The model of the external load cell is ZZ010-025.

[0052] The IN+ and IN- terminals of AD623 are connected to the SIG+ and SIG- terminals of ZZ010-025 respectively. AD623 is powered by a 3.3VA power supply. The EXC+ and EXC- terminals of ZZ010-025 are connected to the +5VA power supply and ground respectively.

[0053] The model of the first power isolator is NNV25-05S05A3NT. The input end of the first power isolator is connected to the +5VA power supply, and the output end is connected to the input end of the first LDO voltage regulator. The model of the first LDO voltage regulator is AMS1117-3.3.

[0054] The first indicator light is an LED lamp LED1 , and the first MCU is connected to the LED lamp LED1 through an IO port.

[0055] The external load cell ZZ010-025 transmits the weight signal to the AD623 amplifier. The amplified analog signal is then digitized by the ADS1115 ADC module. The digital signal is then transmitted via the I2C interface to the STM32F030C8T6 in the weighing unit for secondary development and processing.

[0056] The NFC reader PN532 can be used to read NFC tag information on items, such as ID, batch, etc.

[0057] The communication unit includes a second power isolator, a lithium battery pack, a battery management chip, a DC-DC module, a second LDO regulator, a second communication interface, a second indicator light, a second MCU, a Flash memory, a button group, a Lora module, an LCD and a clock battery. The second communication interface, the second indicator light, the Flash memory, the button group, the Lora module, the LCD and the clock battery are all connected to the second MCU.

[0058] The input end of the second power isolator is connected to the +5VB power supply, and the output end is connected to the battery management chip. The battery management chip is also connected to the lithium battery pack and the DC-DC module respectively. The DC-DC module is connected to the second LDO regulator. The second LDO regulator supplies power to the second communication interface, the second indicator light, the Flash memory, the button group, the Lora module, the LCD, the clock battery, and the second MCU.

[0059] The first communication interface and the second communication interface communicate via a serial bus.

[0060] The model of the second MCU is STM32L476RG, and the second MCU is connected to the second communication interface via a UART interface;

[0061] The second communication interface is interface COM2, the TX end of interface COM2 is connected to the PB6 port of the second MCU, and the RX end is connected to the PB7 port of the second MCU. The PB6 port and the PB7 port are a UART port of the second MCU.

[0062] The model of the Flash memory is W25Q32JV, and the Flash memory is connected to the second MCU via an SPI bus;

[0063] The DI, DO, CLK and CS terminals of the W25Q32JV are connected to the PA7, PA6, PA5 and PA4 ports of the second MCU respectively.

[0064] The model of the Lora module is RAK811. The Lora module is connected to the second MCU via a UART interface.

[0065] The RX and TX ends of RAK811 are connected to the PA9 and PA10 ports of the second MCU respectively.

[0066] The LCD model is ST7789, and the LCD is connected to the second MCU via the SPI interface;

[0067] The SDI, SCK, D / C, and RST terminals of the ST7789 are connected to the PA3, PA2, PB0, and PB1 ports of the second MCU, respectively.

[0068] The W25Q32JV, RAK811, and ST7789 are all powered by a 3.3VB power supply, which is output from the output of the second LDO regulator.

[0069] The second indicator light is LED light LED2, and the second MCU is connected to the LED light LED2 through an IO port;

[0070] The button group includes 4 buttons, and the 4 buttons are controlled by the 4 IO ports of the second MCU respectively;

[0071] In this embodiment, the switch signals of the four buttons are collected respectively through the PB15 port, PB14 port, PB13 port and PB12 port of the second MCU.

[0072] The model of the second power isolator is NNV25-05S05A3NT. The input end of the first power isolator is connected to the +5VB power supply, and the output end is connected to the input end of the battery management chip;

[0073] The model of the battery management chip is BQ24030, and the lithium battery pack is connected to the BAT terminal of the battery management chip;

[0074] The output end of the battery management chip is connected to the input end of the second LDO voltage regulator; the model of the second LDO voltage regulator is TPS73633.

[0075] The VIN terminal of BQ24030 is connected to the output terminal of NNV25-05S05A3NT, the OUT terminal of BQ24030 is connected to the IN terminal of TPS73633, and the OUT terminal of TPS73633 outputs 3.3VB power supply.

[0076] The weighing unit's STM32F030C8T6 transmits data via a serial port to the communication unit's STM32L476RG. The STM32L476RG transmits the data to the host computer via the LoRa module RAK811. It also saves the data to the W25Q32JV Flash memory for backup and displays it in real time on the ST7789 for on-site personnel to review.

[0077] The lithium-ion battery pack provides backup power for the communication unit. The BQ24030 battery management chip manages charge and discharge, maintaining the stability and longevity of the lithium-ion battery. A DC-DC module converts the battery voltage to a suitable input voltage for the communication unit, which is further stabilized to 3.3V by a second LDO regulator to ensure normal operation.

[0078] The wireless electronic scale described in the present invention solves the technical problem of wireless data uploading of electronic scales. Through power isolation and voltage stabilization design, the weighing unit and communication unit are powered independently, effectively reducing mutual interference and ensuring system stability. At the same time, the battery management design improves the device's battery life and charging safety. The weighing sensor is combined with an amplifier and a high-precision ADC module to effectively improve weighing accuracy. The weighing data is transmitted in real time through the wireless module, which is suitable for long-distance real-time monitoring scenarios and ensures the reliability and timeliness of the data. The NFC reader reads the item tag information to achieve automatic identification and recording, avoiding errors caused by manual input. Divided into two parts, the weighing unit and the communication unit, the modular design makes the system easy to maintain and expand, and new functional modules such as other wireless communications or storage methods can be added as needed. The Flash memory of the communication unit backs up the weighing data to ensure that the data will not be lost due to communication interruptions. The LCD screen displays the weighing information in real time, which is convenient for on-site personnel to quickly confirm and improve operational efficiency.

Claims

1. A wireless electronic scale, characterized in that: It includes a power supply module, a weighing unit and a communication unit. The weighing unit and the communication unit communicate with each other through a serial bus. The power supply module supplies power to the weighing unit and the communication unit. The weighing unit is connected to an external weighing sensor. The power module outputs two 5V power supplies, one is +5VA power supply and the other is +5VB power supply; The weighing unit includes a first power isolator, a first LDO voltage regulator, a first communication interface, an NFC reader, an ADC module, an amplifier, a first MCU, and a first indicator light. The first communication interface, the NFC reader, the ADC module, and the first indicator light are all connected to the first MCU. The input end of the first power isolator is connected to a +5VA power supply, and the output end is connected to the input end of the first LDO voltage regulator. The output end of the first LDO voltage regulator supplies power to the NFC reader, the ADC module, the first MCU, and the first indicator light. The ADC module is connected to the amplifier, and the amplifier is connected to an external weighing sensor. The communication unit includes a second power isolator, a lithium battery pack, a battery management chip, a DC-DC module, a second LDO regulator, a second communication interface, a second indicator light, a second MCU, a Flash memory, a button group, a Lora module, an LCD and a clock battery. The second communication interface, the second indicator light, the Flash memory, the button group, the Lora module, the LCD and the clock battery are all connected to the second MCU. The input end of the second power isolator is connected to the +5VB power supply, and the output end is connected to the battery management chip. The battery management chip is also connected to the lithium battery pack and the DC-DC module respectively. The DC-DC module is connected to the second LDO regulator. The second LDO regulator supplies power to the second communication interface, the second indicator light, the Flash memory, the button group, the Lora module, the LCD, the clock battery, and the second MCU. The first communication interface and the second communication interface communicate via a serial bus.

2. A wireless electronic scale according to claim 1, characterized in that: The power supply module includes an AC-DC module IC1, a capacitor C1, a capacitor C2, a TVS tube TVS1, a diode D1, a diode D2, a capacitor C3, a capacitor C4, a capacitor C5 and a capacitor C6. The L terminal and the N terminal of the AC-DC module IC1 are respectively connected to the live wire and the neutral wire of the mains, and the +Vo terminal and the -Vo terminal output a +5V power supply and a ground wire respectively. The capacitor C1 and the capacitor C2 are filter capacitors between the +Vo terminal and the -Vo terminal of the AC-DC module IC1. The TVS tube TVS1 is connected between the +Vo terminal and the -Vo terminal of the AC-DC module IC1. The anode of diode D1 and the anode of diode D2 are both connected to a +5V power supply, the cathode of diode D2 outputs a +5VA power supply, the cathode of diode D1 outputs a +5VB power supply, capacitors C3 and C4 are filter capacitors for the cathode of diode D2, and capacitors C5 and C6 are filter capacitors for the cathode of diode D1.

3. A wireless electronic scale according to claim 1, characterized in that: The model of the first MCU is STM32F030C8T6, and the first MCU is connected to the first communication interface via a UART interface; The NFC reader is a PN532 model, and the NFC reader is connected to the first MCU via an I2C bus; The model of the ADC module is ADS1115, and the ADC module is connected to the first MCU via an I2C bus; The amplifier model is AD623. The differential input of the amplifier is connected to the differential output of the external weighing sensor, and the output of the amplifier is connected to an analog input of the ADC module. The model of the first power isolator is NNV25-05S05A3NT. The input end of the first power isolator is connected to the +5VA power supply, and the output end is connected to the input end of the first LDO voltage regulator. The model of the first LDO voltage regulator is AMS1117-3.

3. The first indicator light is LED lamp LED1, and the first MCU is connected to the LED lamp LED1 through an IO port; The model of the external load cell is ZZ010-025.

4. A wireless electronic scale according to claim 1, characterized in that: The model of the second MCU is STM32L476RG, and the second MCU is connected to the second communication interface via a UART interface; The model of the Flash memory is W25Q32JV, and the Flash memory is connected to the second MCU via an SPI bus; The model of the Lora module is RAK811. The Lora module is connected to the second MCU via a UART interface. The LCD model is ST7789, and the LCD is connected to the second MCU via the SPI interface; The second indicator light is LED light LED2, and the second MCU is connected to the LED light LED2 through an IO port; The button group includes 4 buttons, and the 4 buttons are controlled by the 4 IO ports of the second MCU respectively; The model of the second power isolator is NNV25-05S05A3NT. The input end of the first power isolator is connected to the +5VB power supply, and the output end is connected to the input end of the battery management chip; The model of the battery management chip is BQ24030, and the lithium battery pack is connected to the BAT terminal of the battery management chip; The output end of the battery management chip is connected to the input end of the second LDO regulator; The second LDO regulator is TPS73633.

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