ESP8288-01, 5v wall wart, LD33V not working
Posted: Wed Dec 25, 2019 10:08 pmI'm trying to power my ESP8266-01 from a 5v wall wart. I have an LD33V to bring the 5v down to 3.3v and a couple of 10uF caps across the input and output. With no load on the circuit (ie with the ESP unplugged from the circuit) I get 3.33v out of the regulator.
When I add the ESP I get the red power light on and a flicker of blue, which is encouraging, but it never answers my web request. I know the code is okay because I can unplug this ESP and plug in into my programmer and when running there it responds to the web request just fine. But I notice the programmer has a voltage of 3.3v across VCC and GND even when the ESP is plugged in. In my target circuit with the LD33V etc it drops to 2.89 which might account for the non-response.
I've got a 10k resistor connecting RST to VCC and another connecting CH_PD to VCC (3.3v VCC in both cases). Nothing else is connected. I've looked at lots of circuits that show exactly this (eg http://absaransari.com/2018/01/25/how-to-power-esp8266-from-5v-supply/) and I gather the LM1117-3.3V and the LD33V are the same thing. Also that example has RX and TX hooked up and I have not done that yet, but I will when it starts working.
Anyway, I must have missed a step somewhere. Anyone spot it?
Thanks
When I add the ESP I get the red power light on and a flicker of blue, which is encouraging, but it never answers my web request. I know the code is okay because I can unplug this ESP and plug in into my programmer and when running there it responds to the web request just fine. But I notice the programmer has a voltage of 3.3v across VCC and GND even when the ESP is plugged in. In my target circuit with the LD33V etc it drops to 2.89 which might account for the non-response.
I've got a 10k resistor connecting RST to VCC and another connecting CH_PD to VCC (3.3v VCC in both cases). Nothing else is connected. I've looked at lots of circuits that show exactly this (eg http://absaransari.com/2018/01/25/how-to-power-esp8266-from-5v-supply/) and I gather the LM1117-3.3V and the LD33V are the same thing. Also that example has RX and TX hooked up and I have not done that yet, but I will when it starts working.
Anyway, I must have missed a step somewhere. Anyone spot it?
Thanks