The temperature alarm system does not require complex signal conditioning circuits and A/D conversion circuits to directly perform data acquisition and processing with the MCU . It is convenient, high precision, low power consumption, miniaturization, anti-interference ability, and can be monitored according to different temperature requirements. Other various temperature control systems have a temperature range of -55 ° C to 125 ° C and a temperature error of ± 0.5 ° C in the range of -10 to 85 ° C. The on-site temperature is directly transmitted in the digital way of “first-line busâ€, which greatly improves the system interference. Suitable for temperature measurement in harsh field environments such as environmental controls, equipment or process control, temperature and other consumer electronics.
1 overall design
With the continuous improvement of people's living standards, MCU control is undoubtedly one of the goals pursued by people. The convenience it brings is also undeniable. The temperature alarm system is a typical example, but the more people demand it. The higher the value, the more convenient and convenient facilities for modern people to work, research, live, and provide more simple and convenient facilities. All of them need to start from digital control and intelligent control.
Compared with the traditional system, the temperature alarm system used in this design is convenient for reading temperature measurement values, temperature measurement accuracy, temperature digital display output range, and remote monitoring by transmitting RF signals. The design uses the single-chip Cerebot 32MX4, temperature sensor PMODTMP, common cathode, 8-bit serial data digital transmission, LED to achieve temperature display, can meet the above requirements at the same time. In addition, considering the fact that it may be necessary to obtain information remotely, the system adds a radio frequency transmitting module that provides remote monitoring capabilities.
1.1 Overall design block diagram
Overall design of the system: The overall design block diagram of the thermometer circuit design is shown in Figure 1. The controller uses Cerebot 32MX4, the temperature sensor uses PmodTMP, the alarm uses PmodSPKR1 (1W speaker module board), and the LED display uses PmodCLS (character LCD serial interface module). ), the RF signal transmission uses PmodRF1 (Radio Transceiver).
1.2 main controller
The Cerebot 32MX4 is a useful embedded control tool for students and amateurs in robotics projects. Its versatile design and programmable features give you access to a wide range of microcontroller peripherals and designs for multiple uses. This development board has many I/O connectors and power supply solutions.
The Cerebot 32MX4 works in conjunction with Microchip MPLAB, which supports programming and debugging under MPLAB. The Cerebot 32MX4 provides multiple interfaces to connect peripherals. It has nine connectors for connecting Digilent's PmodTM peripheral modules. Digilent's peripheral modules include H-bridges, digital-to-analog converters, speaker amplifiers, switches, buttons, indicator lights, and converters for easy connection to RS232, terminal blocks, BNC connector jacks, servo motors, and more.
Its features include:
• A PIC32 MX460F512L microcontroller
• Support for programming and debugging development environments under Microchip MPLAB
• Nine Pmod Digilent connector peripheral module boards
• Eight hobby RC servo connectors
• USB 2.0 device, host and OTG support
• two buttons
• four LEDs
• Multiple power options, including USB power
• ESD protection and short circuit protection for all I/O pins.
• 512KB of flash memory
• Internal 32KB SRAM memory
• Compatible with USB 2.0 full speed - mobile (OTG) controller, dedicated DMA communication
• Two serial (SPI) peripheral interfaces
• Two UART serial interfaces
• 2 I2C serial interfaces
• 5 16-bit timers/counters
• Five timer capture inputs
• Five compare / PWM outputs
• 16 10-bit analog inputs
• Two analog comparators
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