Here is the working model of my crock pot.
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Congratulation! Give us more details please.
Thanks
What you want to here? I am in Ethiopia so there is not a lot available.
-Node MCU
-Analog M35 temp sensor insulated with hot glue, coated in JB weld to form a probe.
-Relay
Basic on if below set and off when set point is reached.
I was going to suggest that you post some recipes, but not sure that the bush meat you get in Ethiopia is going to be available in our local supermarket 
Pete.
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α α. αα
@mikekgr you wanted some details
Alright I added two physical buttons for the OLED menu. Hereβs the code. My knowledge is very basic so tear it apart but, Iβm warning you, you will have to explain in detail so I can learn from it. (not just Mike, everyone out there)
#include <ESP8266WiFi.h>
#include <ESP8266mDNS.h>
#include <WiFiUdp.h>
#include <ArduinoOTA.h>
#include <BlynkSimpleEsp8266.h>
#include <SimpleTimer.h>
#include <TimeLib.h>
#include <WidgetRTC.h>
#include <Wire.h> // Oled
#include "SH1106Wire.h" //Oled
SH1106Wire display(0x3c, D3, D7); // D7 -> SCL // D3 -> SDA //Oled
#include "max6675.h"
char auth[] = β";
char ssid[] = "";
char pass[] = "";
#define relayPin D8 //Relay pin
float temp = 0; //Float to handle 2 decimal temp
#define thermoDO D4
#define thermoCS D5
#define thermoCLK D6
MAX6675 thermocouple(thermoCLK, thermoCS, thermoDO);
int ReCnctFlag; //Blynk reconnection flag
int ReCnctCount = 0; //Blynk reconnection counts
int menuPos = 0; //Menu position for OLED
int oldMenu = 0; //Stores previous menu position see menu change function
int menuSelect = 0; //Used to test if item is selected
bool crockpotON; //On/Off status for OLED
#define selectPin D0
#define menuPin D1
bool menuState = 0; //menuState to read menu pin
int selectState = 0;
int setTemp = 33; //Initial setTemp
int oldsetTemp; //Variable to check if settemp has changed so the display does not time out while changing settemp
bool buttonONOFFstatus = 1; //Set to true so works without Blynk
//bool tempType = 1; //Used to toggle C and F for some reason didn't work well with poor internet connection
bool repeatNotify; //Flag to turn off repeat notifications
bool subMenu = false; //keeps track of submenu status (needed for 2 button navigation)
bool menuFlag = false; //used to ensure menu will only advance by 1
WidgetLCD lcd (V0); //Creates a Blynk LCD
WidgetLED StatusLED (V2); //Blynk LED widget
WidgetTerminal terminal1(V25); //Blynk terminal for debug
WidgetRTC rtc; //RTC for reconnect times
//used to create runtime
long t = 0;
int secs = 29;
int mins = 0;
int hours = 0;
int days = 0;
int weeks = 0;
BlynkTimer timer;
void setup(){
Serial.begin(9600);
WiFi.begin(ssid,pass);
Blynk.config(auth);
Blynk.connect();
pinMode(relayPin,OUTPUT);
pinMode(selectPin, INPUT);
pinMode(menuPin, INPUT);
rtc.begin();
timer.setInterval(1000L, upTime);
delay(10);
timer.setInterval(5000L, menuChange);
delay(10);
timer.setInterval(600L, displayOLED); //Refresh Oled display everysecond
timer.setInterval(5000L, checkTemp);
delay(10);
ArduinoOTA.setHostname("CrockpotOLEDv4c");
ArduinoOTA.begin();
timer.setInterval(200L, checkBtns);
display.init();
display.flipScreenVertically();
}
BLYNK_CONNECTED(){
//Serial.println("Connected");
ReCnctCount = 0;
Blynk.virtualWrite(V1, setTemp);
}
void menuChange(){
lcd.print(15,1, menuPos);
lcd.print(15,0, oldMenu);
if (oldMenu == menuPos && oldsetTemp == setTemp){
menuPos = 0;
}
oldMenu = menuPos;
oldsetTemp = setTemp;
}
void loop(){
timer.run();
ArduinoOTA.handle(); //run OTA every loop
if (Blynk.connected()){ //If Blynk connected run as normal
Blynk.run();
}
else if (ReCnctFlag == 0){ //test connection flag
ReCnctFlag = 1; //set connection flag
timer.setTimeout(30000L,[](){ //Lambda "Reconnection" timer function
ReCnctFlag = 0;
ReCnctCount++; //count up reconnection attempts
display.clear();
display.setTextAlignment(TEXT_ALIGN_LEFT);
display.setFont(ArialMT_Plain_10);
display.drawString(0, 0, "Attempting reconnect #" + String(ReCnctCount));
display.display();
secs += 9;
Blynk.connect(); //try to connect again
});
}
}
void checkBtns(){
menuState = digitalRead(menuPin);
selectState = digitalRead(selectPin);
if(menuState == HIGH && menuFlag == false){
menuPos ++;
menuFlag = true;
if (menuPos >= 4 && subMenu == false){
menuPos = 0;
}
timer.setTimeout(500L,[](){ //Lambda "Reconnection" timer function
menuFlag = false; //try to connect again
});
}
if(selectState == HIGH){
menuSelect = 1;
}else{
menuSelect = 0;
}
}
void displayOLED(){
display.clear();
display.setTextAlignment(TEXT_ALIGN_LEFT);
display.setFont(ArialMT_Plain_10);
char upTimebuf[25];
sprintf(upTimebuf,"Up %00d:%01d:%02d:%02d:%02d",weeks,days,hours,mins,secs);
display.drawString(0, 0, upTimebuf);
display.drawString(111,0,"v4c");
display.setTextAlignment(TEXT_ALIGN_LEFT);
display.setFont(ArialMT_Plain_16); //Oled
display.drawString(0, 14, "Set: " + String(setTemp));
display.drawString(0, 30, "Temp: " + String(temp));
if (crockpotON == 0 && buttonONOFFstatus == false){
display.setFont(ArialMT_Plain_10); //Oled
display.drawString(69, 16, "'System Off '");
}
else if (crockpotON == 0 && buttonONOFFstatus == true){
display.setFont(ArialMT_Plain_10); //Oled
display.drawString(72, 14, "'System On'");
}
else if (crockpotON == 1){
display.setFont(ArialMT_Plain_10); //Oled
display.drawString(86, 14, "'Heating'");
}
switch (menuPos){
case 0:
display.setFont(ArialMT_Plain_10);
display.drawString(5, 50, "*Menu Red/Select Green*");
break;
case 1:
display.setFont(ArialMT_Plain_10);
if (buttonONOFFstatus == false){
display.drawString(15, 50, "*ON/OFF* SYS OFF" );
}else{
display.drawString(15, 50, "*ON/OFF* SYS ON" );
}
if (menuSelect == 1){
buttonONOFFstatus = !buttonONOFFstatus;
if (buttonONOFFstatus == false){
Blynk.virtualWrite(V11,HIGH);
}else{
Blynk.virtualWrite(V11,LOW);
}
}
break;
case 2:
display.setFont(ArialMT_Plain_10);
display.drawString(25, 50, "*Raise temp*");
if (menuSelect == 1){
menuPos = 4;
subMenu = true;
}
break;
case 3:
display.setFont(ArialMT_Plain_10);
display.drawString(25, 50, "*Lower temp*");
if (menuSelect ==1){
menuPos = 6;
subMenu = true;
}
break;
case 4:
display.setFont(ArialMT_Plain_10);
display.drawString(25, 50, "***Set +10***");
if (menuSelect == 1){
setTemp = (setTemp + 10);
Blynk.virtualWrite(V1, setTemp);
}
break;
case 5:
display.setFont(ArialMT_Plain_10);
display.drawString(27, 50, "***Set +1***");
subMenu = false;
if (menuSelect == 1){
setTemp = (setTemp + 1);
Blynk.virtualWrite(V1, setTemp);
}
break;
case 6:
display.setFont(ArialMT_Plain_10);
display.drawString(25, 50, "***Set -10***");
if (menuSelect == 1){
setTemp = (setTemp - 10);
Blynk.virtualWrite(V1, setTemp);
}
break;
case 7:
display.setFont(ArialMT_Plain_10);
display.drawString(25, 50, "***Set -1***");
subMenu = false;
if (menuSelect == 1){
setTemp = (setTemp - 1);
Blynk.virtualWrite(V1, setTemp);
}
break;
}
display.display();
Blynk.virtualWrite(V4,upTimebuf);
}
void upTime() {
if ((millis() - t) >= 1000) {
secs += 1;
t = millis();
}
if (secs >= 60) {
mins += 1;
secs = 0;
}
if (mins>= 60) {
hours += 1;
mins = 0;
}
if (hours >= 24) {
days += 1;
hours = 0;
}
if (days >= 7){
weeks += 1;
days = 0;
}
}
BLYNK_WRITE(V9)
{
if (param.asInt())
{
repeatNotify=false;
}
else{
repeatNotify=true;
}
}
BLYNK_WRITE(V11)
{
if (param.asInt())
{
buttonONOFFstatus=false;
lcd.print(0,0, "Crockpot OFF");
lcd.print(0,1, "Crockpot OFF");
}
else{
buttonONOFFstatus=true;
}
}
void checkTemp() { //some testing with C toggle F
//if (tempType == 1){
temp = thermocouple.readCelsius();
Blynk.setProperty(V5, "offBackColor", "#ffffff");
//}else{
// temp = thermocouple.readFahrenheit();
// Blynk.setProperty(V5, "onBackColor", "#ffffff");
//}
lcd.print(0,0, "T " );
lcd.print(2,0, temp);
if (temp >= 99.9){
lcd.print(9,0," ");
}else{
lcd.print(8,0," ");
}
lcd.print(0,1, "Set ");
lcd.print(4,1, setTemp); //LCD's blink if lcd.clear() so print spaces instead
if (setTemp >= 100){ //If statement to check if extra spaces needed on display
lcd.print(7,1, " ");
}else{
lcd.print(6,1, " ");
}
Blynk.virtualWrite(V0,temp);
Blynk.virtualWrite(V3,temp);
if (buttonONOFFstatus == true){
Blynk.virtualWrite(V1,setTemp);
Blynk.virtualWrite(V7,crockpotON);
}
if((temp <= setTemp) && (buttonONOFFstatus == 1)){
StatusLED.on();
digitalWrite(relayPin,LOW);
crockpotON = 1;
//terminal1.println(buttonONOFFstatus);
//terminal1.flush();
}
else if((temp <= setTemp) && (buttonONOFFstatus == 0)){
StatusLED.off();
digitalWrite(relayPin,HIGH);
crockpotON = 0;
//terminal1.println(buttonONOFFstatus);
//terminal1.flush();
}
else{
StatusLED.off();
digitalWrite(relayPin,HIGH);
crockpotON = 0;
if(repeatNotify == true)
{
Blynk.notify("Temperature reached");
}
}
}
BLYNK_WRITE(V1)
{
setTemp = param.asInt();
}
BLYNK_WRITE(V15)
{
menuSelect = param.asInt();
}
BLYNK_WRITE(V16)
{
if (param.asInt()){
menuPos ++;
if (menuPos >= 4 && subMenu == false){
menuPos = 0;
}
}
}
BLYNK_WRITE(V5){
Blynk.setProperty(V5,"onBackColor","#212226");
Blynk.setProperty(V5,"offBackColor","#212226");
}
/*
{
if ((param.asInt()) && tempType == 0){
tempType = param.asInt();
setTemp = ((setTemp - 32)*5/9);
tempType = 1;
Blynk.virtualWrite(V1,setTemp);
}
else {
tempType = param.asInt();
setTemp = ((setTemp * 9 / 5) +32);
tempType = 0;
Blynk.virtualWrite(V1,setTemp);
}
}
*/
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