ESP-01 programming circuit

The programming circuit is finished. And guess what! It works.

The buttons is from the left: Reset and Flash.
When uploading your Arduino sketch follow this procedure

  • Push and hold reset button
  • Push and hold flash button
  • Release the reset button
  • Release the flash button
  • The ESP modul is now in flash mode
  • Push the “upload” button in the Arduino IDE
  • First the sketch is compiled and afterwards it will start uploading.
  • Then push the reset button momentarily to (re)start your program.

ESP-01 programming circuit


ESP-01 Breadboard adapter

As you might know the pins on the ESP-01 module is very tight.ESP-01 adapter
This means that it can’t be mounted on the breadboard without shorting the two pin rows.

One solution is replace the straight pins with some angled pins.

Another solution and very commonly shown on the web is making a breadboard adapter. This way you can connect it across the middle of the breadboard without shorting the pin rows.

The adapter is made of two 1×4 or one 2×4 female header, two 1×4 male pins and a piece of prototyping pcb. my pcb has single islands and the soldering is shown on the photo. It works like a charm.

Next up – making the ESP-01 programming circuit.


FTDI FT232RL USB to TTL Serial Converter

Today I got my USB to Serial converter.
I need the converter for programming the ESP-01 I received a couple off days ago.
Actually I can program it with the arduino board but don’t want to.

I bought the converter on Ebay from a Chinese seller for the price of approx. $2 so properly not a origianal FTDI chip.
But hey! It works.

FTDI TTL Converter

Here is a picture of the board.

It has serial pin out at the bottom and mini usb on the top.
Along the sides is breakout of other, but not needed chip pins.

On the front it has a jumper setting for 3,3V and 5V.
Nice as ESP-01 is strictly 3,3V