latitude和longitude精度不够

[liuyang77886]

hello， 我现在的输出： latitude":30.60,"longitude":104.13, 怎么增加精度到6位 latitude":39.997761,"longitude":116.478935,

[TD-er]

For those who (also) don't speak Chinese:

Latitude and longitude are not accurate enough #65

Hello, my current output: latitude":30.60,"longitude":104.13, how to increase the precision to 6 latitude":39.997761,"longitude":116.478935,

How do you convert the values to String? The default number of decimals in String when converting a floating point is 2 decimals. So you could convert it with something like this:

float lat = 123.4567891
String str(lat, 6);

It should then print something like this: 123.4567891 Please note that a float only has 6 - 7 decimals precision, so you will loose some when you have more decimals before the "."

[mikalhart]

@TD-er: right. I usually do similar: Serial.print(latitude, 6);