- Is there a red light on the ESP-01?
- Try disconnecting everything but 3.3V and GND.
- If the ESP-01 works with just +3.3V and GND (Pins 1 & 8), connect (TX pin 2), and test again, then RX (pin 7), then GPIO2 (pin 3).
- If the blue LED is lit, but it is faint or it seems to flicker on and off when you touch the wires, contact us for a replacement board.