![]() ![]() Use the following code to identify any slave device’s address present on the I2C bus. This function should normally be called only once. Luckily, Arduino offers a scanner library that simplifies the process of identifying slave addresses, eliminating the need to sift through lengthy sensor data sheets and confusing online documentation. begin () This function initializes the Wire library and join the I2C bus as a controller or a peripheral. To read values from components added to an I2C bus in such a project, it is important that you include the correct slave address when coding. You can customize this code to suit whichever sensors you may have in your project, or even display the sensor values on a display module to make your own room thermometer and humidity meter. write(temperature) // Send temperature data to master ![]() readTemperature() // Read temperature from DHT sensor # define DHTTYPE DHT11 // DHT sensor typeĭelay( 2000) // Wait for 2 seconds for DHT to stabilize # define DHTPIN 4 // Pin connected to DHT sensor read() // Read temperature data from slaveĭelay( 2000) // Wait for 2 seconds before requesting temperature again requestFrom( 8, 1) // Request temperature data from slaveīyte temperature = Wire. The master board can then read the value we sent, then display it on the serial monitor. Serial.Let's modify the code we wrote earlier to include the temperature measurement which we will then send to the master board over the I2C bus. Serial.print(digitalRead(PIN_SCL)) //should be HIGH Just put the GPIO (and SDA) to low for some time.ĭoesn't work to change the SDA pin directly to output and write LOW Parallel to a GPIO and check, if the error condition occurs. SDA data line held low ").Īnd want to share it in the first Google result: I connect SDA The SCL line was high, but SDA was being heldĮrror. Problem with a stuck I2C bus on startup (hangs at Well, it's an old issue, but i had the same Update 1 st August 2017 – fix for error 3 (" I2Cīus error. ![]() With I2C_ClearBus.cpp and I2C_ClearBus.h files, modified to work with Nov 2022 – added link to I2C_ClearBus.zip Why the Arduino Wire library is not enough. Reliable Startup for I2C Battery Backed RTC Reliable Startup for I2C Battery Backed RTC Why the Arduino Wire library is not enough. ![]()
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