Temperature measurement tool---K type thermocouple thermometer

K-type temperature measurement module
        This thermometer is inspired by the thermometer video sent by Teacher Sun. I redid the PCB and code to make it smaller, and used STC8G1K08A-SOP8 to replace STM8L (at the cost of a little more power consumption)
        Teacher Sun's video link: Super long standby! Teach you to make a thermometer that can measure the temperature of the chip. _哔哩哔哩_bilibili
        My video link: Temperature measurement tool---K-type thermocouple temperature measurement_哔哩哔哩_bilibili
1. Update
          the PCB version V2, and lead out the RX and TX download ports on the original basis to facilitate later modification and debugging.
          Note: Because the original RX and TX are connected to the CS pins of MAX6675 and TM1621, two pads are led out respectively, which are disconnected when downloading the program, and then connected with tin after downloading.
2. Module parameters
Approximate average power consumption 1mA
Size 36mm*20mm
Measurement accuracy ±2℃
Temperature range 0~999℃
3. Main knowledge points involved in K-type thermometer
         1. SPI communication
         2. How to drive the IC of TM1621 break screen
         3. How to communicate with MAX6675
         4. How to choose hardware to use fewer hardware resources to complete the required functions
         5. How to use one IO port to identify two buttons
         6. Low power consumption of STC8G and usage details (in fact, the actual power consumption is still quite high, and it is not considered low power consumption (* ￣︿￣))
         7. STC8G EEPROM usage and usage details
4. Welding instructions
         Recommended welding order: IC and components of the top chip--> cold end connector of the bottom layer--> button battery holder--> LCD break screen (be sure to put the screen last to weld)
         Key points to pay attention to! !
        a. The STC8G microcontroller needs to be programmed with the code before welding;
        b. The cold end connector needs to be inserted once in advance to make its opening larger, so that there is no need to reserve a gap during welding.
5. Finally,
          regarding the materials, I have put a Taobao link in the component parameters of the schematic diagram, which can be replaced or purchased as needed;
          regarding the download configuration and secondary transplantation precautions of STC-ISP, see the compressed package related TXT file in the appendix, which also contains the source code files I wrote. It uses modular programming. If you need TM1621 and other module codes, please take them yourself. If you have any questions, please leave a message or send a private message. I will provide you with a reference in my limited knowledge (๑•̀ㅂ•́)و✧ 
 
6. Real photos