![]() ![]() It is also the one used to flash the ESP32 board when uploading a new program. It is used to communicate with the computer through the serial monitor. The UART0 is by default on pins GPIO1(TX0) and GPIO3(RX0) of the ESP32. We can use them to communicate with a sensor, an Arduino, a Raspberry Pi, a computer … On the ESP32, 3 UART buses are available: UART0, UART1 and UART2. The UART is the serial protocol that allows easy data exchange between 2 devices. It remains a good practice to use the pins by default to keep good compatibility with external libraries as long as this does not limit the connection of your wires. ESP32 Pinouts available on the Internet show the default association (if you do not specify the pins used). Only the ADC and the capacitive sensors are assigned to fixed pins. With the ESP32, you can choose the ones you want. For example, on the Arduino Uno, you could only have SPI on pins 10, 11, 12, and 13. The SPI, I2C, UART, PWM, and DAC are no longer associated with specific pins. The pins of the ESP32 are much more modular than those of the Arduino: You can “ attach “ a UART, I2C, SPI, and PWM peripheral on the pins you want. So, in reality, there are fewer possible interfaces for each device. The ESP32 already uses some peripherals in its essential operation. They are much more numerous than on a classic Arduino Uno board. To interact with the modules, sensors or electronic circuits, the ESP32, like any microcontroller, has a multitude of peripherals. You can use them, but you must be careful when setting a logic state (3.3V or 0V) with an external pull-up or pull-down resistor. The strapping pins are the GPIO0, GPIO2, GPIO12 (MTDI) and GPIO15 (MTDO). ![]() Depending on the voltage available on these pins, the ESP32 will start either in BOOT mode or in FLASH mode. They are used to put the ESP32 in BOOT mode (to run the program written in the flash memory) or in FLASH mode (to upload the program to the flash memory). Some pins have a unique function when starting the ESP32. They also do not have internal pull-up and pull-down resistors ( pinMode(36, INPUT_PULLUP) or pinMode(36, INPUT_PULLDOWN) cannot be used). ![]() Pins GPIO36 (VP), GPIO39 (VN), GPIO34, and GPIO35 can only be used as input. Fortunately, there are other UART interfaces available. They can be useful for programming the board without a USB but with an external programmer instead. If you use them, you will not be able to upload programs to the board or use the serial monitor via the USB port. The GPIO1 (TX0) and GPIO3 (RX0) pins are used to communicate with the computer in UART via USB. Please maintain attribution to SparkFun Electronics and release anything derivative under the same license.For this reason, these pins are not available on uPesy ESP32 boards. Please use, reuse, and modify these files as you see fit. Installing an Arduino Library Guide - Basic information on how to install an Arduino library.library.properties - General library properties for the Arduino package manager.keywords.txt - Keywords from this library that will be highlighted in the Arduino IDE./src - Source files for the library (.cpp./examples - Example sketches for the library (.ino).paulvha for the suggestions and corrections in his version of the library.jogi-k for adding teensy i2clib support.awatterott for adding getAltitudeCompensation().AndreasExner for adding reset and getAutoSelfCalibration methods.labeneator for adding method to disable calibrate at begin.bobobo1618 for writing a CRC check and improving the return values of the library.jobr97 for adding the getTemperatureOffset() method.Library written by Nathan Seidle ( SparkFun). Sensirion recommends 7 days of continuous readings with at least 1 hour a day of 'fresh air' for self-calibration to complete. Note: The SCD30 has an automatic self-calibration routine. We recommend using the SCD30 in conjunction with the Qwiic Pressure Sensor - MS5637 or the Qwiic Environmental Sensor - BME680 to obtain the current barometric pressure. The CO₂ sensor works very well and for additional accuracy the SCD30 accepts ambient pressure readings. The SCD30 also supports a serial interface but we haven't worked with it. We recommend using a Qwiic Breadboard Cable to connect the SCD30 to a Qwiic compatible board. ![]() It can be downloaded through the Arduino Library manager: search for 'SparkFun SCD30'. We've written an Arduino library to make reading the CO₂, humidity, and temperature very easy. In order to improve accuracy the SCD30 has temperature and humidity sensing built-in, as well as commands to compensate for altitude. The SCD30 from Sensirion is a high quality NDIR based CO₂ sensor capable of detecting 400 to 10000ppm with an accuracy of ±(30ppm+3%). SparkX CO₂ Humidity and Temperature Sensor - SCD30 (SPX-14751) ![]()
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