ESP8266 Community Forum

- Tue Nov 04, 2014 7:17 am #2222 1.I double checked the connections and tried with floating CH_PD. No change.
2. I swapped the power supply with a simple one built around 3.3V regular - no luck. Tried powering it from USB-TTL 3.3V (connected to a hub). The chip started getting warm then USB channel went down. So I don't think the power supply was at fault.
3. I had originally only connected power and serial, so if connections were faulty then I would not have seen any response to AT commands. I have logged humidity data overnight to emoncms without any issues. I bought 2 chips from the eBay seller and both have same temperature problem.

I think there might a problem with the batch of modules which I got.

- Tue Nov 04, 2014 7:34 am #2223 @chickenkiller - check if pcb antenna is connected to esp (not soldered capacitor or something...)
I had the same symptoms (esp-02) without the antenna connected.

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- Thu Nov 27, 2014 10:52 am #3382 Add 10K pull-ups to all IO pins, or assign IO's as outputs (except the GPIO0 which is used for boot mode select, just pull it up). My ESP-01 works fine with 4 pull-ups on GPIO0, GPIO2,GPIO16 and CH_PD.
As a good manner, never leave input pins unconnected - they will generate a noise and increase overall power consumption(and heat). That happens because the input circuit acts as an amplifier with hight amplification ratio and inserts amplified system noises to the internal digital system.

- Sun Dec 21, 2014 1:47 pm #5339 I had tried pulling up unused connections but no luck. The antennae connections seem okay. I ordered another chip from a different eBay seller and had no issues with this chip (I just pulled CH_PD high). So I take it that I received a bad batch. Thanks.