openmv 和arduino无法通信
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# Measure the distance # # This example shows off how to measure the distance through the size in imgage # This example in particular looks for blue pingpong ball. import sensor, image, time from pyb import UART import ujson # For color tracking to work really well you should ideally be in a very, very, # very, controlled enviroment where the lighting is constant... blue_threshold = ((69, 88, -35, -15, -53, 0)) # You may need to tweak the above settings for tracking green things... # Select an area in the Framebuffer to copy the color settings. sensor.reset() # Initialize the camera sensor. sensor.set_pixformat(sensor.RGB565) # use RGB565. sensor.set_framesize(sensor.QQVGA) # use QQVGA for speed. sensor.skip_frames(10) # Let new settings take affect. sensor.set_auto_whitebal(False) # turn this off. clock = time.clock() # Tracks FPS. uart = UART(1,9600) K=500#the value should be measured def find_max(blobs): max_pixels=0 for blob in blobs: if blob[4] > max_pixels: max_blob = blob max_pixels = blob[4] return max_blob while(True): clock.tick() img = sensor.snapshot() blobs =img.find_blobs([blue_threshold]) if blobs: max_blob = find_max(blobs) img.draw_rectangle(max_blob.rect()) img.draw_cross(max_blob.cx(),max_blob.cy()) pcx = max_blob.cx() pcy = max_blob.cy() cxy = {"cx":pcx,"cy":pcy} uart.write(ujson.dumps(cxy)+'\r\n') print(cxy)
#include <ArduinoJson.h>
volatile int cx;
volatile int cy;
volatile char c;
String json;void setup(){
cx = 0;
cy = 0;
c = 0;
json = "";
Serial.begin(9600);
}void loop(){
if (Serial.available() > 0) {
c = char(Serial.read());
json = String(json) + String(c);
if (c == '}') {
StaticJsonBuffer<200> jsonBuffer;
JsonObject& root = jsonBuffer.parseObject(json);
if (!root.success()) {
Serial.println("JSON failed!");
}
int cx = root["cx"];
int cy = root["cy"];
Serial.print("cx = ");
Serial.print(cx);
Serial.print('\t');
Serial.print("cy = ");
Serial.println(cy);
json = "";
}
}
}
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