ESP8266 Community Forum

Hi

I would like to use the ESP8266 as a sensor node that pushes data (or data gets pulled) to a central storage for later analysis. There are some nice examples of this that people have shared, but none that are quite like what I am looking for. All the examples that I have found are at a low-ish frequency. Something on the order of one to two samples per minute...or even per hour. I am looking for something like 10 to 20 samples per second with a network of 10 to 20 sensors. I am thinking to interface to the sensor using I2C to the ESP8266 controller, and then use the wireless connection of the ESP8266 to send data to the central storage. I have enough electronic background to design and build the hardware part. Where I am struggling to get started is on the software side.

By the way, 10 to 20 samples per second might be overkill for my current need. If I could even get 1 Hz, that would be ok for now. If I can transfer at higher rates, then this same framework could support future applications. Also, the reason I am looking at the ESP8266 is the extremely low cost, and grass roots community. An opportunity to have some fun, and solve a need at the same time .

If someone could point me in the right direction for the software for a project like this, I would really appreciate it. Of course, if this project actually gets off the drawing board and toward something resembling reality, I will share with the community.

Thanks
Bernman

It all depends on how you want to code your esp. Do you want to write in script or are you comfortable with C?

I you won't shy away from C i've got an example that almost does what you need : https://github.com/eadf/esp_mqtt_ports
It's a little hack that allows you to connect 32* mcp23017 port extenders over i2c. It is connected over WiFi with MQTT (the IoT protocol of choice). Right now it only outputs the pin settings. To add a 2 Hz poll timer that instead read pin values and publish over mqtt would be trivial.

Edit: I've just uploaded a MQTT sensor example: https://github.com/eadf/esp_mqtt_ping. It periodically (4Hz) sends the result of an ultrasonic distance sensor over mqtt (make sure that you use a local mqtt broker and not a public one).