But if at step 3 it doesn't works, may be a damaged 4067 or a little hidden bad connection. Remove the leds and connect back the opened lines.Īny fail in steps 1 or 2 may indicate that the pin are damaged but you can use another analog pin and other pins for the channels respectively.That would be an OK for the channel selection pins. According to the code, you should see an increasing 1 Hz, 4 bits counter (rather, a BCD counter) in thet formed 4 led array. Reply the previous step to each of the channel pins.That would be an Ok for that pin of the Arduino. Then change in program only the value of testvalue at the beginning of the code and check if the led changes their intensity according to that. Open the wire that goes from the Arduino to the common of the mux, then place at the output of the same Arduino pin, a LED-resistor series.There are some other little tests that you can do after that change in code: So, all depends on the internal construction of the 4067, if are a transparent mux, maybe just with a single resistance in the SIG_pin in that range of resistances, would be fine. Similar currents can be driven by the Arduino (Atmega 328P). At least, by a light sight in a datasheet of the CD74HC4067, shows max currents of +/- 25 mA per pin. At the other hand, the circuit, may be a bit dangerous (and can damage the Arduino or the mux) to use LEDs without a current limiter series resistor (330 - 1K Ohm would be nice values, 1/4 W). That with respect to code, and i hope it helps you. May work if you simply change to //read the value at the SIG pin The syntax are analogWrite(pin, value), so, the piece //read the value at the SIG pin I'm fairly certain that this is more of a problem with the code rather than the circuit.any advice is appreciated!Īccording to the analogWrite() documentation, apparently the trouble are that you have swapped the args. I'm working to modify the code in the article to switch from reading potentiometer values to writing voltage values to the LED's.īelow is the modified sketch the biggest modified change is the loop in the writeMux function: //Mux control pinsĭigitalWrite(controlPin, muxChannel) I did this, I am now using the 5V port and added the pull up resistor, but when I press the buttons nothing happens.I'm attempting to use the multiplexer setup in this article with my Arduino Uno to control the output of LED's, as a way to fully understand the principles of multiplexing. If(inputCH & 0x1) digitalWrite(S0, HIGH) else digitalWrite(S0, LOW) If(inputCH & 0x8) digitalWrite(S3, HIGH) else digitalWrite(S3, LOW) If(inputCH & 0x4) digitalWrite(S2, HIGH) else digitalWrite(S2, LOW) If(inputCH & 0x2) digitalWrite(S1, HIGH) else digitalWrite(S1, LOW) You can replace it ALL with:- if(inputCH & 0x1) digitalWrite(S0, HIGH) else digitalWrite(S0, LOW) If it is a 5V capable board then power it with 5V. And also a transistor on the output to drive the Arduino and the pull up on the board side. If it is only a 3V3 device then you need a potential divider on each output from the Arduino to the board. I have the 8x8 matrix wired up and ready to go - diodes and all (its a pretty standard keyboard matrix). My goal is to create an 8x8 matrixed 61-note MIDI controller. I cant figure out for the life of me how to wire my CD74HC4067 multiplexer. Why are you powering it with 3V3? You will damage it by puting 5V signals into it. Im using the amazing Control Surface library. Unsigned myDigitalRead(short inputCH, short dig_in)Īdd a pull up resistor to Pin 6, about 4K7. Serial.println(myDigitalRead(0,digital)) Unsigned myDigitalRead(short inputCH, short dig_in) When I press my push button nothing happens, and if I try using it without the PULLUP I only get noise. Just some little (maybe stupid) question to ask to you guys (and of course, to Arduino gods XD). In my code I did what I was doing before the MUX and called the Z(SIG) wire as an INPUT_PULLUP, the thing is, I cannot read my input. Just made myself to Arduino yesterday and its been great :D. I was able to easily do that using Arduino internal pull up system, but as I needed more buttons I bought a CD74HC4067 multiplexer. I'm trying to build a simple joystick where once I press a button, my Arduino Leonardo sends a signal to my computer and using a library games can recognize it.
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