int adc_id = 0; int HistoryValue = 0; char printBuffer[128]; void setup() { Serial.begin(9600); } void loop() { int value = analogRead(adc_id); // get adc value if(((HistoryValue>=value) && ((HistoryValue - value) > 10)) || ((HistoryValue<value) && ((value - HistoryValue) > 10))) { sprintf(printBuffer,"ADC%d level is %d\n",adc_id, value); Serial.print(printBuffer); HistoryValue = value; } }