How to hardware reset ESP8266-01 with uno

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1

Hello all,
I'm using UNO (5V) + ESP8266 (3.6V) to send data on the cloud.
Everything woks fine except that I need to H/W reset manually the ESP8266 via the ESP8266 RST pin at the 1st start-up (and after UNO started) to able the serial communication.
I would like to know if it is possible to implement an a H/W reset in the UNO code using the RST pin?
Thanks a lot in advance for your help

2

Note that UNO has 5 volt logic levels. As I remember, the ESP family uses 3.3 volt. Level shifting needs to be used. 2 resistors can do that.

3

@Railroader for reset we only need to pull to LOW

    pinMode(ESP_EN_PIN, OUTPUT);
    delay(5);
    digitalWrite(ESP_EN_PIN, LOW); 
    delay(5);
    pinMode(ESP_EN_PIN, INPUT); // let it to 3.3 V pull-up resistor
4

Thanks a lot, it worked like a charm

5

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