try unplugging potential wiring issues and see if it can be written to without anything on it.

the board programmer is busy running your last batch of code.

the board has something plugged into digital 1 and 0 which are serial i/o pins.

Programmer not in sync issues generally occur because the board is recognized but cannot be written to for one reason or another. Also consider that you will need to specify the correct board as it will default to an uno. Please provide your pinout and basic information about the Com ports available on the ide. I realized I had to keep the chip off while flashing or I would end up with errors or Com busy. I had this happen when setting up hc-05 for the first time.

So if you have anything such as a sensor hooked to them it may be generating data keeping the line busy instead of it being able to negotiate.

These pins are used for your serial line on usb. I would also wonder if you have your sensor hooked to digital pins 0 and 1. If this is not the case go into the device manager and see if you can see the board listed. On some of my development machines after everything settled out my devices will show up on Com 4 and 5 when I am working on two at a time. Sometimes it can recognize mice and other devices as Com 1 or 2 instead of your arduino. Try unplugging the arduino and see if Com 1 is still there. a temperature sensor, periodically reporting data to a server (like a RPi) over wifi.I've got an idea. A common usage is to have ESP8266 sensor node(s), e.g.

The ESP32 NodeMCU board (2nd link) is a relatively new product and community support isn't yet up to the level of the ESP8266 product.ģ) To emphasize the previous responses, there are several development environments which allow one to use the ESP8266 as a stand-alone network connected node without physical connection to another processor like a RPi. The ESP-01 (your 1st link) is very sensitive to power supply layout and will likely lead to frustration. It will be easier to integrate and will provide a much faster and more versatile wifi capability.Ģ) If you go the ESP route for a project, I'd recommend starting with an ESP8266 NodeMCU board rather than either of the products you've linked. 1) If you simply want to add wifi capability to an RPi-2B then a usb wifi adapter is a better approach.

Esp8266 serial port windows com port