Conflict Between Wifi & analogRead() in ESP32s

[marwinwijaya]

I have a problem about esp32s, where when I use the Wifi.h lib some analogRead () always produces a value of 4095, I try on pin 0 of esp32s, is there a pin that can be used simultaneously between wifi and analogRead ()? I attach a picture pinout esp32s Thanks you

[sansillusion]

If I remember correctly, ADC2 pins are not capable of analogread when wifi is in use. Use an ADC1 pin instead. Le dim. 19 juill. 2020 7 h 39 a.m., Muhamad Arwin Wijaya < notifications@github.com> a écrit :

…

[image: ESP32-Pinout] <https://user-images.githubusercontent.com/54936971/87873795-935d8300-c9ee-11ea-9a98-7eafa7cc55d6.png> I have a problem about esp32s, where when I use the Wifi.h lib some analogRead () always produces a value of 4095, I try on pin 0 of esp32s, is there a pin that can be used simultaneously between wifi and analogRead ()? I attach a picture pinout esp32s Thanks you — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#4187>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHBFDCSJAWCDYEXQDVEGH6TR4LLP7ANCNFSM4PBHUIFQ> .

[marwinwijaya]

ADC1 pin is IO34, IO35, IO32, IO33 @sansillusion ?

[sansillusion]

I would think so, I did not have to use ADC yet, just remember seeing this being a recurrent issue for people here.

[atanisoft]

@marwinwijaya all pins above 30 are ADC1.

[marwinwijaya]

thank you @sansillusion and @atanisoft

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[qiaoyukeji]

我在用 esp32cam 时，wifi 与 adc2 不能同时使用，使用 wifi 时 adc2 读数一直为0。后来，我尝试交替使用 wifi 与 adc2 ，例如每10秒钟断开wifi一次，读取adc2的值，然后重新连接wifi，使两个功能都能使用，经过测试，能够正常使用。

Arduino 的代码如下：

#include <Arduino.h>
#include <WiFi.h>
#include "esp_camera.h"
#include <vector>
#include <string.h>
using namespace std;

// ph and tem 变量设置
const int phPin = 2;
float ph;
float Value = 0;

// wifi 
const char *ssid = "TP-LINK_1760";
const char *password = "987654321";

void wifi_init() {
  WiFi.mode(WIFI_STA);
  WiFi.setSleep(false);  //关闭STA模式下wifi休眠，提高响应速度
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi Connected!");
  Serial.print("IP Address:");
  Serial.println(WiFi.localIP());
}



void setup() {

  Serial.begin(115200);
  //  wifi 初始化
  wifi_init();

  pinMode(phPin, INPUT);
}
void loop() {
  // 关闭 wifi
  WiFi.disconnect(true);
  WiFi.mode(WIFI_OFF);
  
  // adc2 读取 phPin 上的数据
  pinMode(phPin, INPUT);
  Value = analogRead(phPin);
  
  // 打开 wifi
  wifi_init();
  Serial.print(Value);
  delay(500);
}