TZS soil moisture meter software design and anti-jamming design

TZS soil moisture meter software design and anti-jamming design of soil moisture meter program is in supporting the development platform. Considering the portability and readability, modular C programming language. Because of its memory, using SCM's own standard JTAG interface, you can easily program debugging and code to download the program by homemade Downloader. Program flow shown in Figure 5. When the system is powered up and initialized, that is, whether a key is pressed, if the measurement key is pressed, then start the measurement process, converts the analog voltage output of the photodetector into a corresponding digital, after treatment with the set value compare, save and display the measurement of moisture, and then determine whether the next measurement. If no button is pressed for a long time, more than a set of standby time, meter will automatically shut down. System program is divided into: determine the key subroutines, data collection routines, data storage routines, display routines and communication routines. For smart instrumentation, the order to enable it to steady work in the design to fully consider the source of the interference signal so that the interference is reduced to a minimum. This design reduces the interference signals from both hardware and software, to ensure that the meter can stability. On the hardware side, the unused pin microcontroller, set it to the input mode, and the pins do ground handling, which is conducive to anti-electromagnetic radiation and electrostatic interference. Crystal should be as close to the main chip MSP430F149, housing well grounded, lead crystal to the microcontroller pin surrounded by land lines and other signal lines should not have passed. In addition, the wiring should be as short as possible, do not go fly line, all add to an integrated decoupling capacitors between each chip's power and ground. On the software side, first with the watchdog circuit, which helps prevent the program running; followed in data processing, using median filter. Instrument Name: Soil Moisture Instrument Model: Features TZS soil moisture meter: computer software has powerful data processing capabilities (statistics, analysis, display, query), the curve of the data collection form, visual display, data can be collected EXCEL spreadsheet file storage, user-friendly storage and handling of data, software permanently free upgrade. Probe consistency, different parameters can be interchanged probe socket. The instrument has 64 channels, synchronization detection capacity, within the capacity range, unlimited number of probes. May need its own combination of parameters, sampling time interval set separately for each sensor. Soil moisture meter technical parameters: Moisture Unit:% (m3/m3) moisture test range :0-100% Response time: ≤ 2 and Second percentage error: ≤ 3% soil moisture probes Operating temperature: -40 ℃ -80 ℃ Standard cable length: 1.5m (custom-made according to customer needs, can be up to 1000 m) Product details: Soil moisture meter http://www.top17.net/yq_list/yq_38_1.html Zhejiang Top Instrument http:/ / www.top17.net/