-pH Sensor Kit เริ่มได้เห็นแล้วว่าจะอ่านค่าและแสดงผลอย่างไร และได้ศึกษาพร้อมเขียนโค้ดเสร็จ อ่านค่าทาง monitor ได้เลย
รุ่น : pH Sensor Kit
pH Sensor Kit เป็นชุด Sensor ตรวจจับความเป็นกรดด่าง พร้อมโมดูล Controller ที่ทำหน้าที่ตรวจจับสัญญาณ Analog ที่วัดได้จาก Sensor แล้วประมวลผลส่งข้อมูลให้กับผู้ใช้งานทาง Serial Port (UART) ผู้ใช้เพียงส่งคำสั่งไปที่ โมดูล Controller เพื่อ Get Data ตามต้องการ
Need to measure precise pH? This kit includes everything you need including buffer solutions for calibration, pH probe, and even a board to connect directly to your favorite microcontroller. This is laboratory-grade equipment and not just a toy or educational kit.
All you need to do is follow the included instructions for calibrating the probe and connect it to the included pH Stamp. The pH Stamp outputs data from the probe over serial, so it couldn't be much easier to use.
Includes:
- 250ml Red Buffer Solution - pH 4.0
- 250ml Yellow Buffer Solution - pH 7.0
- 250ml Blue Buffer Solution - pH 10.0
- 250ml Storage Solution
- pH Probe
- pH Stamp
- BNC Connector
Features:
- pH probe3 buffer solutions and storage solution
- pH Range: 0-14 (Na+ error at >12.3 pH)
- Speed of Response: 95% in 1 second
- Isopotential point: pH 7.00 (0 mV)
- Offset: +/- 0.20 pH
- 38400 baud rate default
แหล่งที่มาพร้อมข้อมูล http://www.thaieasyelec.com/products/sensors/ph-d-o-orp/ph-sensor-kit-detail.html
-อย่างไรก็ตามยังคงมีปัยหาในการทำงานก็ยังติดตรงการส่งserial คือส่ง 9600 ไปแล้วข้อมมูลที่แสดงออกอ่านค่าไม่ได้ต้องเปลี่ยนเป็น 38400 ถึงอ่าค่าได้แล้วก็ทำได้แล้ว พร้อมมีโค้ดทดสอบการใช้งานและเอาไปใช้งานจริง
แหล่งที่มา https://www.youtube.com/watch?v=UIk6CAINpwo
โค้ดที่นำไปใช้งาน
#include <SoftwareSerial.h> //we have to include the SoftwareSerial library, or else we can't use it.
#define rx 2 //define what pin rx is going to be.
#define tx 3 //define what pin Tx is going to be.
SoftwareSerial myserial(rx, tx); //define how the soft serial port is going to work.
char ph_data[20]; //we make a 20 byte character array to hold incoming data from the pH.
char computerdata[20]; //we make a 20 byte character array to hold incoming data from a pc/mac/other.
byte received_from_computer=0; //we need to know how many characters have been received.
byte received_from_sensor=0; //we need to know how many characters have been received.
byte arduino_only=0; //if you would like to operate the pH Circuit with the Arduino only and not use the serial monitor to send it commands set this to 1. The data will still come out on the serial monitor, so you can see it working.
byte startup=0; //used to make sure the Arduino takes over control of the pH Circuit properly.
float ph=0; //used to hold a floating point number that is the pH.
byte string_received=0; //used to identify when we have received a string from the pH circuit.
void setup(){
Serial.begin(38400); //enable the hardware serial port
myserial.begin(38400); //enable the software serial port
}
void serialEvent(){
monitor(pc/mac/other) is received.
if(arduino_only!=1){
received_from_computer=Serial.readBytesUntil(13,computerdata,20);
computerdata[received_from_computer]=0;
myserial.print(computerdata); //we transmit the data received from the serial monitor(pc/mac/other) through the soft serial port to the pH Circuit.
myserial.print('\r'); //all data sent to the pH Circuit must end with a <CR>.
}
}
void loop(){
if(myserial.available() > 0){ //if we see that the pH Circuit has sent a character.
received_from_sensor=myserial.readBytesUntil(13,ph_data,20); //we read the data sent from pH Circuit until we see a <CR>. We also count how many character have been received.
ph_data[received_from_sensor]=0; //we add a 0 to the spot in the array just after the last character we received. This will stop us from transmitting incorrect data that may have been left in the buffer.
string_received=1; //a flag used when the Arduino is controlling the pH Circuit to let us know that a complete string has been received.
Serial.print("PH:");Serial.println(ph_data); //lets transmit that data received from the pH Circuit to the serial monitor.
}
if(arduino_only==1){Arduino_Control();}
}
void Arduino_Control(){
if(startup==0){ //if the Arduino just booted up, we need to set some things up first.
myserial.print("c,0\r"); //take the pH Circuit out of continues mode.
delay(50); //on start up sometimes the first command is missed.
myserial.print("c,0\r");
delay(50);
startup=1; //startup is completed, let's not do this again during normal operation.
}
delay(800); //we will take a reading ever 800ms. You can make this much longer or shorter if you like.
myserial.print("R\r"); //send it the command to take a single reading.
if(string_received==1){ //did we get data back from the ph Circuit?
ph=atof(ph_data); //many people ask us "how do I convert a string into a float?"
if(ph>=7.5){Serial.println("high\r");} //This is the proof that it has been converted into a float.
if(ph<7.5){Serial.println("low\r");} //This is the proof that it has been converted into a float.
string_received=0;} //reset the string received flag.
}
//here are some functions you might find useful
//these functions are not enabled
void cal_s(){ //calibrate to a pH of 7
myserial.print("cal,mid,7\r");} //send the "cal,mid,7" command to calibrate to a pH of 7.00
void cal_f(){ //calibrate to a pH of 4
myserial.print("cal,low,4\r");} //send the "cal,low,4" command to calibrate to a pH of 4.00
void cal_t(){ //calibrate to a pH of 10.00
myserial.print("cal,high,10\r");} //send the "cal,high,10" command to calibrate to a pH of 10.00
void phFactoryDefault(){ //factory defaults the pH circuit
myserial.print("X\r");} //send the "X" command to factory reset the device
void read_info(){ //get device info
myserial.print("I\r");} //send the "I" command to query the information
void phSetLEDs(byte enabled) //turn the LEDs on or off
{
if(enabled) //if enabled is > 0
myserial.print("L,1\r"); //the LED's will turn ON
else //if enabled is 0
myserial.print("L,0\r"); //the LED's will turn OFF
}
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