Temperature Sensor + I2C + Serial Port + PC (pyserial) Example

Temperature Sensor + I2C + Serial Port + PC (pyserial) Example

The example is a bit messy, mainly for learning:

Temperature sensor DS18B20, E2PROM, I2C, serial port read/write, PC (pyserial) Data Display

SerialPort. py PC serial host program, you can set the maximum alarm temperature

You need to install python3 or above and the pyserial library. The example is written in python3.4.

After the upper computer sends an alarm temperature to the MCU, the MCU stores the temperature to E2PROM,

After the single-chip microcomputer is powered off and restarted, it reads the alarm value from E2PROM.

I2C. h I2C bus read/write and settings

Read and Write settings for lcd1602.h lcd1602

Read, write, and set temp_ds18b20

# Define at24c02 0xa0 // address of the device whose data is written by at24c02

# Define max_temp_e2prom_flag 0xff // memory data mark with the upper limit of the alarm temperature.

Sbit power_port = P2 ^ 3; // Alarm port

Int max_temp = 340; // The maximum alarm temperature. The default value is 340.

Int max_temp_buf = 0; // alarm upper limit temperature cache for serial port

Int sp_read_count = 0; // serial port data, read Byte Count

Bit sp_read_flag = 0; // serial port reading flag

Uint8 buf_byte; // serial data cache

Download the example of serial communication and E2PROM and I2C bus:

Http://pan.baidu.com/s/1pJ9aKaf

#! /Usr/bin/ENV Python # encoding = UTF-8 "====================== ========================================================== ============= single-chip microcomputer example, PC copyright (c) junyang studio 2014-07-26 document junyang Studio ([email protected]) Updated logo: 14:00:00 [email protected] ==================================== ========================================================== = "Import serialimport structport = 2 # Serial Port Number baudrate = 4800 # baud rate max_temp = 335 # alarm temperature SER = serial. serial () def writetemp (temp): H = int (temp/256) L = TEMP % 256 DATA = struct. pack ("B"), h) Ser. write (data) Data = struct. pack ("B"), L) Ser. write (data) def readtemp (): Print (SER) while (1): H = Ser. read () L = Ser. read () M = int. from_bytes (H + L, byteorder = 'Big ', signed = false) S = STR (m) S = s [0] + s [1] + ". "+ s [2] +" ℃ "Print (s) def main (): Ser. setport (port) # Set the serial port number Ser. setbaudrate (baudrate) # Set the baud rate Ser. open () writetemp (max_temp) readtemp () Ser. close () If _ name _ = "_ main _": Main ()