Hello, unfortunately we don’t have any tutorials on that exact subject. We’re considering adding/writing a tutorial about that subject in the next couple of weeks. Can you describe which sensors would your like to use and the project behavior?
In summary, to establish a communication between an Arduino and an ESP32, you can connect the Arduino TX and RX cables to the ESP32 RX and TX. Then, in your code you can establish a serial communication at the same baud rate to exchange data between the two devices.
Hello Rui, Thank you for your message. I wait for your next tutorial dealing with exchange data between ESP32 and Arduino and manage them via internet. Concerning with my project, in summary, it is based on acquiring the solar light spectrum around the whole day with particular interest at sunrise and sunset. The device acquires data from 4 LDR, UV and DHT-22 and other two parameters to control the operation behaviour. Three of 4 LDRs are filtered respectively with blue, green and red shield. Datalogger shield is utilised to store data on a memory card by building a 9 columns (time, temperature and humidity included) x n rows matrix. The use of the datalogger shield implies using only 4 of the six analog inputs of Arduino. 4 relays are selectively driven to acquire each signal. A 12 V lead acid battery supplies the device through 2 DC-DC converters set at different output voltages to supply Arduino and other circuits.
I don’t know exactly when I’ll have time to publish the “serial data exchange” tutorial, but I’ll definitely write something on that subject in the next couple of weeks.
I’ll probably post a project like this: 1 Arduino reading LDR+DHT22 and sending that data to the ESP32 via serial to display/publish it on a web server.
Hello Sara, Yes, I have this problem: I am building an AC power meter using AC712 and ZMPT101B sensors. Everything works okay when I use the Arduino analog pins, but it doesn’t work when I use the ESP32 or ESP8266 ADC pins. My goal is to upload the sensor data to some cloud platform such as ThingSpeak; therefore, I thought that I could use an Arduino board for making the measurements and then make a serial connection with ESP32 or ESP8266 for sending the data to the cloud. I have tried to connect the boards without success, could you please give me some guidance? Kindest regards, Rafael!
Hi Rafael. When you say that it doesn’t work with the ESP32 and ESP8266 analog pins, what happens exactly? Do you have the sample code that you use for serial communication between arduino and ESP32? Otherwise, it is very difficult to figure out what might be wrong. Regards, Sara
From arduino, i am using the serial communication to transfer the data from the arduino serial monitor to the esp32 module. The serial communication for distance is successful in the arduino IDE. Next step is to transfer the data to be displayed in Blynk through the esp32. I am able to make the device online.
You can connect ESP32 with arduino uno/mega directly without using any logic level shifter provided arduino is powered with 3.3 volt power supply. But if you using 5 volt for arduino then you have to use logic level shifter while interfacing it with ESP32 as ESP32 gpio pins have 3.3 volt as upper limit.
Close the Serial Monitor (if it is open) and click and hold the BOOT button on the ESP32 board while clicking on the Upload button on Arduino IDE. Once it identifies the chip, you can release the BOOT button and the code will be uploaded. To reset the microcontroller, press the EN button once.
Bluetooth only work between 2 devices(maybe 3 on special occasions). But, you can connect the ESP32 modules with each other over WiFi, making one master and multiple slaves, and you can send and receive data from them though the master over BT.
You can send debug messages from Arduino to the computer and display them on your computer screen. The Arduino IDE (described in Recipe 1.3) provides a Serial Monitor (shown in Figure 4-1) to display serial data received by Arduino.
It works with Arduino, ESP32, ESP8266. This library allows to easily control dimmers (also known as thyristors). Fast digital input/output functions. A C/C++ library to use DS1302 RTC chip.
In terms of connectivity, most Arduino boards don't have Wi-Fi or Bluetooth functionality on their own, and this includes the R4 Minima. They require the use of an add-on Ethernet or Wi-Fi shield. On the other hand, the Esp32 has Wi-Fi capabilities built-in, making it suitable for IoT projects.
First, we need to connect on this format and also need to supply power to both devices. The output will be like this: 1st line is Sending a message and 2nd line is receiving a message. Output on esp8266 is: 1st line is a receiving message and 2nd line is sending a message.
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Rui Santos Staff answered 6 years ago
Daniele Gozzi answered 6 years ago
Rafael Cordova Uvidia answered 4 years ago
Sara Santos Staff answered 4 years ago