I'm fairly new to Arduino so I used a sample code before integrating this into my main code. I'm printing my value in a JSON format over serial. My Arduino outputs this and the python receives this and prints it in the same format
{
"value" : 5
}
but when I use python to try writing to a JSON file on my computer, I'm not getting the same JSON format. Can anyone figure out what's wrong? I need to write to my JSON file in JSON format, but instead, I'm getting this format written in my JSON file " \"value\": 5\r\n" instead of {"value: 5"}. Another problem I'm getting is that sometimes the values I get in my JSON get cut off so sometimes I end up with \r\n" or other parts of the current output. My goal is to get the python code to overwrite the JSON file in real-time, so whenever I open the JSON file, the entire output should be there in the correct JSON format. Any help is appreciated, thank you.
Arduino Code:
#include <ArduinoJson.h>
int analogPin = 3;
int data = 0;
char userInput;
StaticJsonDocument<100> testDocument;
char buffer[100];
void setup(){
Serial.begin(9600); // setup serial
StaticJsonDocument<100> testDocument;
testDocument["sensorType"] = "Temperature";
testDocument["value"] = 10;
char buffer[100];
serializeJsonPretty(testDocument, buffer);
Serial.println(buffer);
}
int(i)=1;
void loop(){
testDocument["value"] = i;
serializeJsonPretty(testDocument, buffer);
Serial.println(buffer);
i=i+1;
}
Python Code:
import serial
import json
import time
ser = serial.Serial('COM4', baudrate = 9600, timeout=1)
while 1:
data = (ser.readline().decode('ascii')) #split('\r\n')
#j = json.loads(data)
file = "C:/Users/Mike/Desktop/test.json"
my_data_file = open(file, 'w')
with open(file1, "w") as my_data_file :
json.dump(data, my_data_file)
print(data)
