ESP8266 Community Forum

- Thu Jun 08, 2017 8:02 am #66911 Hi,

Hopefully someone can help. Ive been beating my head against this for hours now. I am receiving data feeds via MQTT. Values ranging from 0.00 - 15.00.
I have the below code setup to compare the last read feed and my pre defined number. If the last read feed is above or below my desired number i would like it to turn on or off some outputs.
The issues i have at the moment is it appears the code is only comparing the first digit of the received value (e.g 3 if the received value was 31.08). If the value received was 31.08 it would only write outputs 2 & 13. Yet if the number was 9 outputs 2, 13, 4 & 5 would be on.
Im sure its something simple around how its looking at the numbers. Any help would be greatly appreciated,

Code: Select all 
Adafruit_MQTT_Subscribe *subscription;
  while ((subscription = mqtt.readSubscription(5000))) {
    if (subscription == &uv_index_feed) {
      Serial.print(F("Got uv index: "));
      Serial.println((char *)uv_index_feed.lastread);
    } else if(subscription == &errors) {
      Serial.print(F("ERROR: "));
      Serial.println((char *)errors.lastread);
    } else if(subscription == &throttle) {
      Serial.println((char *)throttle.lastread);
    } if (strcmp((char *)uv_index_feed.lastread,"0" ) >= 0) {
        digitalWrite(2, LOW);
    } if (strcmp((char *)uv_index_feed.lastread,"3") >= 0) {
        digitalWrite(13, LOW);
    } if (strcmp((char *)uv_index_feed.lastread,"3") < 0) {
        digitalWrite(13, HIGH);
    } if (strcmp((char *)uv_index_feed.lastread,"6") >= 0) {
        digitalWrite(4, LOW);
    } if (strcmp((char *)uv_index_feed.lastread,"6") < 0) {
        digitalWrite(4, HIGH);
    } if (strcmp((char *)uv_index_feed.lastread,"8") >= 0) {
        digitalWrite(5, LOW);
    } if (strcmp((char *)uv_index_feed.lastread,"8") < 0) {
        digitalWrite(5, HIGH);
    } if (strcmp((char *)uv_index_feed.lastread,"11") >= 0) {
        digitalWrite(14, LOW);
    } if (strcmp((char *)uv_index_feed.lastread,"11") < 0) {
       digitalWrite(14, HIGH);
    }
  }