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Have you tried changing HELO to EHLO? There are a number of causes of this error so we'd need to see more of your code.
Arduino OLED Thermometer And Hygrometer With DHT11 For Beginners
DS3231 OLED alarm clock with 2-button menu setting and temperature display
Arduino OLED Voltage Meter
OLED and Distance Sensor Interfacing With Arduino
Very Cool. Thank you for sharing!
How to use a vibration sensor (shake switch) - Arduino Tutorial
Arducam-Mini With ESP8266 Wi-Fi Is Amazing
Tools and Materials for Arduino
Welcome to Arduino
Obstacle Avoiding Robot
Monitoring humidity, temperature in the hen house: DHT11, DS18B20, ESP8266
Using the 4 pins of the ESP8266-01
How to use the ESP8266-01 pins
VERY COOL! Great directions...Many Thanks. All worked straight away. Was a fun little project for a Sunday Afternoon.
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