To plug the ESP-201 in the breadboard is necessary to remove the 4 pin connector from the botton of the board and install it in the component side.
A quick pinout reference to start the wiring:
Note: GPIO9 and GPIO10 are connected to the FLASH memory (may be unusable). Here is a “surgery” procedure to use them: ESP-201 board modification
First experiment sending the analog value from A0 to ThingSpeak:
Experimenting with different antennas:
Best results with the external antenna (the metal one):
Experimenting with Deep Sleep: