The closer you look, the less you see!
Informatie (ENG) The SCT013 series are sensors of non-invasive, current transformers that measure the intensity of a current that crosses a conductor without needing to cut or modify the conductor itself. We can use these sensors with a processor, like Arduino, to measure the intensity or power consumed by a …
Leakage current of your Arduino input pin likely limits the accuracy, especially for low-light measurements. Leakage current of the photodiode is probably less than that of Arduino, but also impacts low-light accuracy. Leakage currents are affected greatly by temperature. If …
BESTELLEN Informatie (ENG) The Allegro ACS712 provides economical and precise solutions for AC or DC current sensing in industrial, commercial, and communications systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection …
Shape Cuboid Sensing method Retro-reflective Sensing distance 4000 mm Sensing distance (min.) 100 mm Setting method Manual adjustment Connection method Cable Cable length 2 m Output type NPN Operation mode Dark-ON, Light-ON Response time 1 ms Material housing PBT …
BESTELLEN Een kleine module die nodig is om loadcellen correct uit te kunnen lezen. De HX711 chip versterkt het signaal zodat de variaties van de load cell digitaal verwerkt kunnen worden een microcontroller. Specificaties: Spanningsbereik: 2.7-5V DC Nomimaal stroomverbruik: 1.6mA …
De pagina beschrijft in grote lijnen hoe men analoge sensoren uitleest die alleen een 4-20mA stroom afgeven. Een 4-20 mA stroomlus is een 2-draads elektrische leiding op een constante spanning (max 24 V) waarin een variërende gelijkstroom vloeit tussen 4 …
Het volgende voorbeeld laat zien hoe je HEX strings naar een serieel RS232 apparaat stuurt en dan het “antwoord” uit kan lezen in HEX strings. C++ / Arduino
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#include <SoftwareSerial.h> byte command[2] = {0xAA, 0x41}; byte response[5]; SoftwareSerial rs232device(10, 11, SERIAL_8N1); // TX, RX. void setup() { Serial.begin(9600); rs232device.begin(9600); } void loop() { rs232device.write(command, sizeof(command)); rs232device.readBytes(response, 5); Serial.print(response[0], HEX);Serial.print(" "); Serial.print(response[1], HEX);Serial.print(" "); Serial.print(response[2], HEX);Serial.print(" "); Serial.print(response[3], HEX);Serial.print(" "); Serial.println(response[4], HEX); delay(500); } |
Python / Raspberry Pi
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#!/usr/bin/env python import serial import time #------------------------------------------------------------------------------- def ByteToHex( byteStr ): """ Convert a byte string to it's hex string representation e.g. for output. """ # Uses list comprehension which is a fractionally faster implementation than # the alternative, more readable, implementation below # # hex = [] # for aChar in byteStr: # hex.append( "%02X " % ord( aChar ) ) # # return ''.join( hex ).strip() return ''.join( [ "%02X " % ord( x ) for x in byteStr ] ).strip() #------------------------------------------------------------------------------- def HexToByte( hexStr ): """ Convert a string hex byte values into a byte string. The Hex Byte values may or may not be space separated. """ # The list comprehension implementation is fractionally slower in this case # # hexStr = ''.join( hexStr.split(" ") ) # return ''.join( ["%c" % chr( int ( hexStr[i:i+2],16 ) ) \ # for i in range(0, len( hexStr ), 2) ] ) bytes = [] hexStr = ''.join( hexStr.split(" ") ) for i in range(0, len(hexStr), 2): bytes.append( chr( int (hexStr[i:i+2], 16 ) ) ) return ''.join( bytes ) #------------------------------------------------------------------------------- # USB D- = RXD TTL STICK # USB D+ = TXD TTL STICK ### POORT INSTELLINGEN ser = serial.Serial() ser.port = "/dev/ttyUSB0" ser.baudrate = 9600 ser.parity=serial.PARITY_NONE ser.stopbits=serial.STOPBITS_ONE ser.bytesize=serial.EIGHTBITS ser.timeout=1 try: ser.open() print("Connected to: " + ser.portstr) except Exception, e: print "error open serial port: " + str(e) exit() while 1: ### METHODE #1 ser.write([0xAA, 0x41]) ### METHODE #2 #ser.write(serial.to_bytes([0xAA,0x41])) ### METHODE #3 #ser.write("\xAA\x41") ### METHODE #4 #ser.write(chr(0xAA)) #ser.write(chr(0x41)) ### METHODE #5 #msg = bytearray([0xAA, 0x41]) #ser.write(msg) #data = ser.read(8) ### AANTAL BYTES LEZEN data = ser.readline() ## HELE LIJN LEZEN #data = ser.readall() ### ALLES LEZEN print "SIZE: ", len(data) print "RAW: " + data print "HEX1: " + ByteToHex(data) print "HEX2: " + data.encode('hex') time.sleep(2) |
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SIZE: 7 RAW: WAWA HEX1: 57 41 57 41 00 00 00 HEX2: 57415741000000 |
BESTELLEN Informatie (ENG) The CNY70 is a reflective sensor that includes an infrared emitter and phototransistor in a leaded package which blocks visible light. • Package type: leaded • Detector type: phototransistor • Dimensions (L x W x H in …
BESTELLEN Informatie (ENG) IR Sensors work by using a specific light sensor to detect a select light wavelength in the Infra-Red (IR) spectrum. By using an LED which produces light at the same wavelength as what the sensor is looking …
BESTELLEN Informatie (ENG) 1. Low power consumption, small size, easy to install 2. Internal use of digital signal processing, pit interference strong 3. High sensitivity, reliability, and can be widely used in automatic sensing circuit 4. Repeatable trigger mode: that …