Sending order from ESP32 to Arduino Mega

Question

I am new here and this my question regarding my graduation project. I want to control the Arduino board from ESP32.

For example, a temperature sensor will be connected to the ESP32, when ESP32 read a certain temperature then will send information to the Arduino board. The Arduino board - connected to relay to switch the fan - will understand that is hot and turn the relay.

This should be asked on SE.Arduino, not here. I have flagged it for migration. Do not cross-post. If it doesn't end up being migrated, then delete this post and ask on SE.Arduino - although if you do that, then the answer provided below will be lost. — Greenonline, May 12 '19 at 13:14

score 2 · Accepted Answer · edited May 25 '19 at 01:17

2

From what you have asked, It looks quite straightforward to me so I am assuming that you are new to controllers. Apologies otherwise. What you need to do is:

Serially connect both devices (I2C/SPI).
Program ESP32 to send a command/message serially to Arduino to switch on/off the fan relay based on your temperature thresholds.
Program the Arduino to switch the fan relay on/off according to the received message.

edited May 25 '19 at 01:17

Greenonline

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answered May 12 '19 at 07:36

Ahmed

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Thank you for your explanation. Yes, I am new to controllers. I Did step 2 and 3. the only problem is with part 1, I searched for I2C connection and I did but there was a problem I do not know why. I did the setup like in this page https://create.arduino.cc/projecthub/jeffpar0721/add-wifi-to-arduino-uno-663b9e?fbclid=IwAR0zr5xDVk2KzP3n3VmlaQPSZf4Lg1UDq2q7bGmWEgUafedlxachJ5wZsHw instead of ESP8266 I just used my ESP32. – AHMED HUSSEIN May 12 '19 at 12:26
In the link you provided, I don't see anything about I2C connection. Please see this link: (https://howtomechatronics.com/tutorials/arduino/how-i2c-communication-works-and-how-to-use-it-with-arduino/) and this link: (https://robot-electronics.co.uk/i2c-tutorial). Note that it may look complicated but it is rather simple. – Ahmed May 13 '19 at 07:18
What you need to make I2C connection setup is: Two I2C devices(You have them already), two Jumper cables for Connection and maybe two pullup Resistors. (See if I2C pins on Arduino and/or ESp controller are internally puled up. If yes, you don't need pullup resistors). Rest is just a sequence of commands that you can easily write for both controllers. – Ahmed May 13 '19 at 07:18

Sending order from ESP32 to Arduino Mega

1 Answers1