I also show that in the circuit there is a timer that uses other Analog pins, but in the code I didn't include that part. As I said, adding delays helps, but in my final application I cannot afford to have 1s delays. The Arduino has 6 analog pins, which means we can monitor a maximum of 6 sensors. This is helpful in devices where there are only 1 or few analog pins. Learn Arduino in 30 Minutes (video): this video shows you how to control ONE of 16 relay using the CD74HC4067 multiplexer chip with Arduino Arduino Multiplexor. This module is used when you need to monitor multiple sensors or input devices on a single port. If you enable the commented code that starts to switch the outputs it is even worse. The CD74HC4067 is a 16-channel multiplexer. With this code only the results already fluctuate: Output:īut it goes crazy when the input is higher, close to 5V: Output: The analogRead(MUX) in the selectMux function was added because I read in a post that they suggested to do that in order to get a more accurate reading. (Error in the drawing: "temp" is actually a "light sensor" as in the bottom of the post.) I hope I've been clear enough and that someone can point me the right way! The only thing that seems to stabilize everything is connecting a capacitor between the MUX out and ground, and using a 20msec delay, but it only works for a bit. I also tried using the digital pins to control the mux but to no avail. Cuantas más operaciones, más tardarás en hacer el siguiente bucle de lectura del mux. Lo propio es hacer un bucle para leer las entradas del mux, guardar los valores y después de leer, hacer las operaciones. But in my project which is far more complex and uses also other analog channels I need a delay of ~1 second to get a correct reading, which is absolutely unacceptable since I need it to run in real-time(ish). Un ciclo de multiplexación de 16 entradas (74HC4067) tarda menos de 10 ms. In a simple sketch I've tried adding some delay (40 msec) and the issue goes away. My problem is that when switching between one channel and another, my readings highly fluctuate, but only when the reading value is > 500 or so, and I don't understand why. Specify below the analog pin numbers (as for analogRead) you would like to use. Data can be read with the Arduinos 10-bit ADC. The pins I use to switch the channels are A3 and A2 (when the other sensors will arrive also A1 will be dedicated to that). Use analog pins for s0-3 with Lightweight-CD74HC4067-Arduino. In this tutorial, we will see the use of the CD4051 integrated circuit which can be. Mux output is connected to A0 since the readings I do are analog. The multiplexer is an integrated circuit made up of logic circuits allowing several signals to be concentrated on the same output (mutiplexing or mux) or to connect an input to one of its N outputs (demultiplexing or demux). Specifically I have a light sensor and a sound sensor. You should see all 16 signals printed or plotted.I'm having a small issue with the CD74HC4067 multiplexer/demultiplexer: I am using it to receive data from an array of sensors (at the moment I have only 2, but in a near future they will grow). If you are using a 3-bit multiplexer, like the CD74HC4051, you can uncomment the code specific to this multiplexer, and use only three address pins.Ĭonnect some potentiometers or other analog sensors to the 16 inputs of the multiplexer, and open the serial monitor (CTRL+SHIFT+M) or the serial plotter (CTRL+SHIFT+L). Otherwise, just connect the enable pin to ground. Ask Question Asked 7 years, 10 months ago. Issue with CD74HC4067 MUX on high values. Optionally you can connect the enable pin as well, this is useful if you want to use multiple multiplexers with the same address lines and the same analog input. Arduino Stack Exchange is a question and answer site for developers of open-source hardware and software that is compatible with Arduino. A0: CD74HC4067 signal pin ("common input/output").Boards: AVR, AVR USB, Nano Every, Nano 33 IoT, Nano 33 BLE, Pi Pico, Due, Teensy 3.x, ESP8266, ESP32 It prints the values of all 16 inputs of a multiplexers to the serial monitor. This chip is like a rotary switch - it internal. This is an example of the AnalogMultiplex class. This is a breakout board for the very handy 16-Channel Analog/Digital Multiplexer/Demultiplexer CD74HC4067.
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