I want to send data from my Arduino UNO to esp-32 via serial connection. I connected an Arduino UNO to esp-32 via tx-rx pins. It works fine when the delay() is greater than or equal to 999. When it is less than 999, the value is not transferred to esp-32. Is there any to reduce the delay time?

Yes, there is a way to reduce the delay time.

Show your code for both the ESP32 and the Uno. Your topic has been moved to a more suitable location on the forum. Introductory Tutorials is for tutorials that e.g. you write, not for questions. Feel free to write a tutorial once you have solved your problem :wink:

how can i reduce it? can you please provide me any way?

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sure, here is my code for arduino uno: void setup() { Serial.begin(115200); } void loop() { int val = analogRead(A1); Serial.println("LDR value: "+ String(val)); delay(999); } here is my code for esp-32: #define RXp2 16 #define TXp2 17 void setup() { // put your setup code here, to run …

think you need to wait for serial data to arrive, e.g. void loop() { if(Serial2.available()) { Serial.println("Received value: "); Serial.println(Serial2.readString()); } }

Same result, not showing any output when delay is less than 999

It happened because the readString() method waits timeout of 1 second. Do not use it, read the data yourself char by char with read() method or decrease the timeout by Serial.setTimeout() - Arduino Reference The Arduino programming language Reference, organized into Functions, Variabl…

yeah, this is working, thank you very much

Serial connection between ESP-32 and Arduino UNO

Projects General Guidance

horace November 13, 2022, 5:18pm 6

have a look at thread communication-between-esp32-cam-and-arduino-uno

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Serial connection between ESP-32 and Arduino UNO

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