ESP8266, NodeMCU: how to create xbm images for displaying on OLED 128x64 I2C Displays - Squix - TechBlog. Do you know these wonderfully cheap SSD1306 based OLED displays with the Stand Alone means the ESP8266 will work without the use of any extra micro controllers connected to it.
Radio works perfect without SD card reader. SD card worked with radio connected - but then the radio does not work anymore. I made a fritzing of my setup, just to spot any errors, just to go check each connection once more. One thing I can think of is that the GPIO15 is a hardware CS (HCS), while my D4 is not.
At the end of the programming the ESP8266 reboots and 330 Protection resistor prevents RX shorting the programmer's output drive. The I2C series resistors provide similar protection for the TX, RX from shorts on the I2C bus ; The ESP8266 is 3.3V device so preferably use 3.3V I2C slaves. Many, but not all, I2C devices are are 3.3V these days.
It's recommended to use the flasher that is delivered with the ESP Easy software (FlashESP8266.exe). It needs no settings and works just out of the box. During testing it's useful to see what the ESP is doing. ESP Easy is programmed to give information via the serial port, the same port you use for flashing.
CTS and DSR are not useful for upload (they are inputs). Make sure the adapter can work with 3.3V IO voltage: it should have a jumper or a switch to select between 5V and 3.3V, or be marked as 3.3V only. Adapters based around the following ICs should work: FT232RL; CP2102; CH340G; PL2303-based adapters are known not to work on Mac OS X.
Sep 24, 2015 · Well, in a non-multitasking environment, sharing an SPI bus is not a concern, IMHO. Atmega328’s SPI bus has an 8 MHz speed, which is not enormous but some 80x the speed of normal ESP8266 using ...
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