nodemcu和uno传输信息求助

利用arduino和nodemcu进行通信，使用uart进行通信，传输过去的数据无法读取到，想请各位大佬帮忙看一下，帮一下孩子，呜呜呜
下面附上几张测试的截图：



arduino中的代码如下：

int MQ_6;
int MQ_7;
char a[100];
char b[100];
#include <DHT.h>

#define DHTPIN 7

#define DHTTYPE DHT11

DHT dht(DHTPIN, DHTTYPE);

#include <LiquidCrystal.h>

double solar_volt =0; // variable for solar panel voltage

double bat_volt=0; // variable for battery voltage

double sample1=0; // reading from Arduino pin A0

double sample2=0; // reading from Arduino pin A1

void setup()

{

Serial.begin(9600);

pinMode(A0,INPUT);

pinMode(A1,INPUT);

pinMode(7,INPUT);

dht.begin(); //DHT开始工作

}

void loop()

{

delay(2000);

// 读温度或湿度要用250毫秒

float h = dht.readHumidity();//读湿度

float t = dht.readTemperature();//读温度，默认为摄氏度

char s[1000];

MQ_6 = t;

MQ_7 = h;

for(int i=0;i<150;i++)

{

sample1+=analogRead(A0); //read the input voltage from solar panel

sample2+=analogRead(A1); //read the battery voltage

delay(5);

}

sample1=sample1/150;

sample2=sample2/150;

solar_volt=(sample14.673 3.127)/1000+0.23;

bat_volt=(sample24.673 3.127)/1000+0.23;

dtostrf(solar_volt,4,2,a);

dtostrf(bat_volt,4,2,b);

sprintf(s,"{"wendu":%d,"shidu":%d,"solar_volt":%s,"bat_volt":%s}",MQ_6,MQ_7,a,b);

Serial.println(s);

delay(1000);