ESP8266 Community Forum

Hey everyone,

i've bought an ESP8266 - 01 and something with my "Chip Power Down" doesn't work as I thought it will.


I uploaded a blank sketch on my arduino uno and connected it as I listed here:

Gnd->Gnd
Vcc->3.3V (using the 5V pin from the arduino and a voltage divider; 2 resistors)
TXD->RX (Pin 0)
RXD->TX (Pin 1)

Then the red LED turns on. But if I now plung in the CH_PD to 3.3V the red LED goes off. Can someone please help me. I thought the blue LED should blink one time and the red LED is on for the whole time when it is connected to power.

I'm sorry for my bad english. I would be very thankful for every tip.

Patrick

Yes, the ESP is supposed to boot when the CH_PD line is held high. Considering the red LED is just wired to VCC through a resistor, my first bet is that you are not powering the device properly, and it draws so much current that the voltage drops. I guess that your voltage divider is not a proper solution.

GPIO2/GPIO0 also need to be pulled up to HIGH using 4K7 or 10K resistors.

You can't use a voltage divider to power things, they only work on high impedence inputs, since the high side resistor is in series with the load and its voltage drop will increase with the load current.
Use a proper voltage regulator with an output rating of at least 300mA instead.