I just finished my last project that is based on a TEENSY3.1 and an ESP8266 wifi module (s. here: WIFI-NEWSFEEDREADER IN A MATCHBOX (based on TEENSY3.1 and ESP8266-03; programmed with ARDUINO-IDE) - YouTube) when I was told that I could have done the whole thing without the Teensy, but only with the ESP8266 as there is an ARDUINO-IDE-addon available that enables to program the ESP8266 with the ARDUINO-IDE. I immediately tried it and a simple test-program worked on the first try. I’m not sure if I will manage to port the code of the FEEDREADER as I don’t know if I will make “u8glib” work with the ESP8266, but I first decided to do a simple benchmark to see how fast the ESP8266 is in comparison to a TEENSY3.1 and an ARDUINO-DUE.
BENCHMARK RESULTS (smaller values are better):
ESP8266 @80MHz TEENSY3.1 @72MHz ARDUINO DUE @84MHz
“float” [ms] 431 564 636
“int” [ms] 56 12 28
ESP8266 @160MHz TEENSY3.1 @96MHz
“float” [ms] 216 505
“int” [ms] 28 9
It seems that the ESP8266 is good with float (floating point unit inside?), but relatively bad with integer!
void setup() {
Serial.begin(115200);
}
void loop() {
float a = (float) millis();
int time = millis();
for (int i = 0; i < 100000; i++) a += a * a + 1000.7 / a - 40.4;
time = millis() - time;
Serial.println("floating point calculations");
Serial.println("---------------------------");
Serial.print("a = ");
Serial.println(a);
Serial.print("dT[ms] = ");
Serial.println(time);
Serial.println("");
time = millis();
int b = time;
for (int i = 0; i < 100000; i++) b += b * b + 1000 / b - 40;
time = millis() - time;
Serial.println("integer calculations");
Serial.println("------------------");
Serial.print("b = ");
Serial.println(b);
Serial.print("dT[ms] = ");
Serial.println(time);
Serial.println("");
delay(1000);
}
//I first tried it with trigonometry-functions, but the ESP8266 crashed!