logger

This is a NodeMCU (ESP-WROOM-32) based ADC data logger.

Building

Install PlatformIO in Visual Studio code, hit compile and upload.

Updating

Upload via USB cable or use the OTA mechanism. For this the computer must be connected to the ESP somehow via Wifi (AP or STA mode).

Add this for the OTA update mode in the platformio.ini

upload_protocol = espota
upload_port = 192.168.1.66
upload_flags =
    --port=3232

Configuration

Channel config

# write config
curl -X POST 192.168.1.66/channel/1/config\
     -H "Content-Type: application/json" \
     -d '{"samplingInterval":1,"bufferSize":1,"samplingEnabled":true,"offset":0.194,"factor":82.0,"divisor":1.0, "fl":80}'
# read config
curl -X GET 192.168.1.66/channel/1/config | jq

Wifi config

# write wifi config to connect to WIFI
curl -X POST http://192.168.4.1/wifi -H "Content-Type: application/json" -d '{"mode":"sta","ssid":"myWIFI","pass":"mypassword"}'
# write wifi config to make a custom WIFI
curl -X POST http://192.168.4.1/wifi -H "Content-Type: application/json" -d '{"mode":"ap"}'
# Read wifi config
curl http://192.168.4.1/wifi | jq

Reading Samples

Using HTTP Requests

curl -s -X GET 192.168.1.66/channel/1 | jq
{
  "data": [
    {
      "timestamp": 184537436,
      "value": 84.57603
    }
  ],
  "overflow": true
}

Using MQTT

$ mosquitto_sub -h 192.168.1.66 -t 'channel/1' -v
channel/1 {84.4439}
channel/1 {84.5100}
channel/1 {84.5100}
channel/1 {84.5100}

Using Websockets

See client/ for a golang demo accessing the measurement channels via websocket in golang

$ go run main.go -host 192.168.1.66
0, 0, 0.000000
1, 184795439, 84.443909
1, 184796439, 84.443909
1, 184797439, 84.509972
1, 184798439, 84.377838
1, 184799439, 84.245697

siredmar/logger