Hi folks, now I'll teach you how to make your programmer to the ESP-01 and ESP-201, (perhaps serve with other models) using an Arduino UNO, a few cables and optionally a button and a slide switch, in my case I use them because I had available, with this programmer able to upload the Arduino sketches and any other firmware (AT, LUA, Espruino, etc).

Step 1: Okay, Let's Start, First Do the Following Circuit.

Optionally if necessary can place a 100n capacitor between Vcc and GND and if you're a fan of security, you can put a divider or Logic Level Converter voltage between RX and TX.