ESP201 Performance

Maybe it’s just me..  I’ve been messing with the DS18B20 and the ESP-01 and on advice from a respondent in here wrote a quick averaging function and have been monitoring that all morning – lovely. No connection issues, nothing.

So this afternoon I took my little ESP-01 development board (which has pullups, 3v3 regulator and more) and extended leads (maybe 4” to an ESP201 board – I did this because I wanted access to the ADC which of course is not available on the ESP-01.

I pulled GPIO15 low and the other pins of the ESP01 match to the relevant pins on the ESP201 (GPIO0, GPIO2, RESET, PD, GND, 3v3.

I grounded GPIO0 and programmed the chip – no problem. So in short all the pins that would have attached to the 01 are attached to the 201 and GPIOis grounded. Does this sound right?

What had been a perfectly functioning ESP01 program is now working on the ESP201 – and the ADC is working fine (around 1.1v for value 1024 – ie 10-bit ADC) – granted a degree of variation!

BUT I’m getting more variation on the temperature than I’d expect – but FAR more importantly the WIFI range is ATTROCIOUS. Looking at 3v3 line with scope, no more noise than on the 01.

Any thoughts?


4 thoughts on “ESP201 Performance

  1. You need a “tip line”, Pete….

    Someone (and I suspect from the kitty pictures that it might be Sprite_tm) has just posted a rather natty adapter board on Osh Park. Look twice before you hit the “bin it” button (hint:- that isn’t the date in the board name).

    Comes in purple or purple; your choice.

  2. Somewhere I read that the ADC is used for transmission over WiFi. You can not simultaneously use ADC converter and transmit frames via WiFi.

  3. Yes, I would agree there. The zero ohm link is bridged to connect to the ant connector. I haven’t used any of my201 units yet, I have been favouring the use of the12’s. They have been fine.
    One issue that may or may not be, is that of the pcb antenna. Early on I was playing with some ACKme modules which required a sub board and printed antenna. I had problems with ground planes etc which caused the module to go ‘rf live’ resulting in decreased output and even rf collapse, due to pin pick up and rf injection saturation.

    My first approach to using this 201 board would be to check out the signal strength and coverage when in pcb antenna mode, using it as an access point. I’d want to be sure that all those stretched out pin connections and its fundamental layout didn’t create any problems.

    Right now, I have four 12’s attached to my broker, which is turning out to be fun.(of sorts)
    The point of being able to address the issue of identity and configuration by messaging to particular topics ( as has been previously mentioned) will become more important as multiple units come into play.
    It’s interesting watching what happens when attaching units with the same id. There is a circular routine of disconnecting the ‘old’ connection with the a new connection of the same name!

    Keep up the good work! Normally one of my first port of calls in the rounds, to see what’s happening:)

  4. You do have the antenna cable connected, right? From the pictures is seems that the jumper to select between the antenna connector and the PCB antenna is soldered to the connector location.

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