ESP FTDI upload auto reset

[glynhudson]

If we want to be able to upload via FTDI without having to manually put the ESP into bootloader mode this circuit can be used to achieve this using the chip-power down pin (CH_PD):

This works with all ESP's and 3.3V and 5V FTDI. The B5819W Schotkey diode is used to convert 5V > 3.3V, we don't needs this on the HP monitor since we have a dedicated 3.3V voltage regulator onboard.

Upload should ber set to use ck method rather than nodemcu. For referance nodmcu reset uses 2 transistors and 2 resistors coupled with an USB/Serial chip. Each transistor is connected to one pin of the USB serial converter. One for RTS the other for DTR as follow:

Design notes:

http://hallard.me/esp8266-autoreset/