This kit can be used as a high-precision digital voltmeter or easily converted to a digital thermometer. Using the latest STC brand 51 series MCU design, powerful, debugging parameters can be powered down memory, voltage range 2.4-5.5V can work, built-in watchdog, will not crash, the program has been written, circuit design advanced and practical, cost-effective Extremely high.
The program has been written to the microcontroller, and the buyer only needs to solder and install to work.
Function introduction:
This thermometer uses MF58 type thermistor to obtain the temperature value. The latest 51-chip STC15F204EA is used to measure the series voltage division value of the thermistor with a single-chip microcomputer. It is converted into the corresponding Celsius temperature and displayed on the 4-digit digital tube. Temperature measurement ranges from -40 ° C to +120 ° C. The circuit is simple and the manufacturing success rate is high. A DC voltage measurement function is also included, and the voltage measurement can measure up to 50V. Manual measurement of the measured and measured voltages is also possible. The operation method is as follows: long press the switch S1 to switch between temperature measurement and voltage measurement. When measuring the temperature, the last digit of the digital tube displays the character C when measuring the voltage. The last digit of the digital tube displays the character U. Short press the switches S1 and S2 to fine tune the measured value. For example, when measuring the temperature, short press S2 to decrease the measured value, and short press S1 to increase the measured value. Accurate values can be obtained by continuously pressing S1 and S2 shortly. The same method can also be used to obtain accurate voltage measurements when measuring voltage. Press and hold the switch S2 to save the calibration value, so that even if the power is turned on and the measurement result is still the same as the value after calibration, it is not necessary to calibrate again.
