Slide 1: Setting up and IoT

Session 2: Micropython and
Hardware access

Uli Raich
Formally CERN, Geneva, Switzerland

Slide 2: The WeMos D1 mini CPU card

ESP8266 cost: 2.21 Euros	ESP32 cost: 4.1o Euros

Slide 3: CPU Pinout

ESP8266	ESP32

to the GPIO pin numbers

The pins in the white fields go to the WeMos D1 mini bus

and are also available on the ESP8266

The other pins are only accessible on the ESP32 CPU card

The pin numbers Dx do not correspond to GPIO pin numbers!

Please refer to the next slide for correspondence

Slide 4: CPU pinouts for reference

Slide 5: Meaning of pins on ESP8266

GPIO: General Purpose Input Output. Drives a single digital line which can be programmed input or output SCL/SDA: The I2C bus:a 2 wire bus interfacing sensors or actuators to the CPU SCL,MISO,MOSI,SS: SPI the Serial Peripheral Interface. Used fast communication with external device

Slide 6: Meaning of pins on ESP32

Slide 7: How to program the processor

Several development tools are available: ESP_IDF: The official Espressif development tool. Includes a gcc compiler for the ESP8266 and the ESP32 Please see https://docs.espressif.com/projects/esp-idf/en/latest/ The Arduino IDENeeds extensions for these processors and the different CPU boards see: https://www.arduino.cc/en/Main/Software MicroPython see: https://micropython-docs-esp32.readthedocs.io/en/esp32_doc/ and https://github.com/micropython/micropython/

Uli Raich - 2019-05-13

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