使用blinker后，传感器读数一直为0

speghetti

想做个实验，读取A0的光敏传感器数值显示到Blinker app上。

1. 单独测试光敏传感器，在串口观察读数正常，且在遮挡时有变化

2. 加入blinker 功能代码，同样连线，同样传感器，串口读数一直为0

代码如下：


#define BLINKER_WIFI

#include <Blinker.h>

char auth[] = "XXXX";
char ssid[] = "xxxx";
char pswd[] = "xxxx";

BlinkerNumber LIGHT("lgt");

int lgt_read = 0;

void heartbeat() {
  LIGHT.print(lgt_read);
}


void setup()
{
    Serial.begin(115200);
    BLINKER_DEBUG.stream(Serial);

    Blinker.begin(auth, ssid, pswd);
    Blinker.attachHeartbeat(heartbeat);



}

void loop()
{
    Blinker.run();

    BLINKER_LOG("LIGHT: ",analogRead(A0));   //<-- 串口一直 显示"LIGHT: 0"  
    lgt_read = analogRead(A0);
    Blinker.delay(2000);
}

speghetti

如果把Serial.println(analogRead(A0));加在Blinker.begin(auth, ssid, pswd);之前是有正常读数的
看来Blinker好像会影响analogRead

coloz

和blinker无关，对于esp芯片，在使用了wifi后，ADC2将不可用

speghetti

那该怎么规避这个限制，来实现我的目的啊？

speghetti

搞定了，感谢@coloz的提示。

speghetti

增加如下代码

const int LGT_PIN = 33;  //GPIO33, 对应我的板子D5,自行对照自己的板子管脚图修改

//in setup() add below codes

  pinMode(LGT_PIN,INPUT);
  adcAttachPin(LGT_PIN);
  analogReadResolution(11);
  analogSetAttenuation(ADC_6db);
  

//其余不变

speghetti

详细原因在https://arduino.stackexchange.com/questions/84888/analog-read-not-working-while-using-wifi

The ESP32 has two ADCs. One of them, ADC2, is actively used by the WiFi.

From the IDF documentation:

Since the ADC2 module is also used by the Wi-Fi, only one of them could get the preemption when using together, which means the adc2_get_raw() may get blocked until Wi-Fi stops, and vice versa.

That means you can't use the ADC on any of the ADC2 channels while WiFi is on: GPIO4, GPIO0, GPIO2, GPIO15, GPIO13, GPIO12, GPIO14, GPIO27, GPIO25 and GPIO26.

But you can use ADC1, which uses pins GPIO36, GPIO37, GPIO38, GPIO39, GPIO32, GPIO33, GPIO34 and GPIO35.

speghetti

speghetti 发表于 2022-9-28 11:15
增加如下代码

const int LGT_PIN = 33;  //GPIO33, 对应我的板子D5,自行对照自己的板子管脚图修改

忘了说要把loop()里的analogRead(A0)
改过来

analogRead(LGT_PIN);