Serial. Serial.println("Wrong cable pin configuration!") If (sizeof(pinsCableBegin)!=sizeof(pinsCableEnd)) Int endA = Ĭonst byte NUMCABLES=sizeof(pinsCableBegin) LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin) #define I2C_ADDR 0x27 // Define I2C Address for controller Red are differences, where the functionality has moved on Mega2560 compared to UNO. Green have the same function and position as the Arduino UNO R3. #include // F Malpartida's NewLiquidCrystal library Inspired by Nicks UNO pinout I did a similar one for the Arduino Mega2560 R3. So far i come up with this code, but nothing works. My experience in programming is very basic, i have the male and the female connectors of the cable that i need to test, i can wire it directly but i need a program. But they can give you some good ideas to pursue.ĭo you have additional 19-pin connectors so that you can easily plug the cable-under-test into your tester? I will advise you to stay away from Instructables. I'm surprised you can't find some examples online. In Arduino Leonardo, Pin 2 SDA and Pin 3 SCL. For Arduino Mega2560, Pin 20 SDA and Pin 21 SCL. In Arduino UNO, Pin A4 SDA and Pin A5 SCL. Below list shows these pin numbers in different boards. Arduino Mega Pinout Voltage Regulator-The voltage regulator converts the input voltage to 5V. It has a crystal oscillator-16 MHz, a power jack, an ICSP header, a USB-B port, and a RESET button. Is Google broken today? This kind of request is very common. For I2C communication, different boards of Arduino have different pins dedicated as SDA and SCL pins. Arduino Mega 2560 has 54 digital input/output pins, where 16 pins are analog inputs, 14 are PWM pins, and 6 are hardware serial ports (UARTs). You can learn to do hex-binary conversions of any size in your head. Hex easier than decimal because it's easy to convert between hex an binary.One LED at a time comes on in-sequence and you have watch to see if one of the LEDs doesn't come-on, or if two LEDs come-on at once, or if they come-on out-of sequence. I've seen some old-time testers that simply have an LED on each line. (It usually takes a little more testing to figure-out exactly what's wrong, and there's a way we can type-in hex values to test.) Where I work we test 8-bit I/O ports (not cables & not Arduino) with walking ones, or some of our tests just write all of the binary values from 0-255 (0-FF hex) and when there's an error it shows the read & write hex* values so we can figure-out what's wrong. Of course, you need current limiting resistors so a short doesn't fry your Arduino. It pretty easy to identify an open or shorted line, but determining which line is shorted to which, or exactly how the cable is mis-wired or defective takes a bit more "software". In binary, a 4-bit walking one looks like this: Then of course, read the data at the other end to make sure it matches. A common test is a "walking one's" test where you drive one line high while driving all the other lines low.
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