Data sheet acquired from Harris Semiconductor. SCHSD. CAUTION: The CDB, CDB, and CDB analog multiplexers are digitally-controlled . Product data sheet. Rev. 12 — 25 March 4 of Nexperia. HEFB. 8- channel analog multiplexer/demultiplexer. Fig 5. Logic diagram. An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in . Product Folder Links: CDB CDB CDB.
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The is an analog multiplexer – it can switch analog signals between Vee Sign up or log in Sign up using Google. A 10K resistor works well in most cases. This means that this chip will not work with 3. Sign up using Facebook. Email Required, but never shown. From the Arduino wiki page, it reads “Futhermore, the is able to work with analog values; in the case cd4015b the Arduino, you are datasgeet to use the analog inputs with a voltage between V and route them to an Analog-In Pin on your Arduino.
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Sign up using Email and Password. So – tell more about what is connected on the analog mux pins?
Is it possible that they are getting triggered? Datasheet simulate this circuit — Schematic created using CircuitLab I’ve connected the input to 5V for testing stability of the reading. Ideally something that would allow multiplexing without distorting the signal. Also the pulldown resistor need not be that high.
If I start reading random ports between 0 and 7it reads correctly for about 10 seconds, then suddenly starts reading zero. Still, I was hoping for a method that wouldn’t tamper with the input signal in any way: I saw a comment on the ‘arduino’ board which said that “the for loop repeatedly cycles count from 0 to 7, so [selector pins] will average 2.
I’m using a breadboard of questionable quality.
The Arduino has about 10Mohm resistance on the input side, so it shouldn’t make a difference, but the max reading was about instead of If I read only port 4 for 30 seconds, it starts to read correctly and stable. I did try to add a 10k resistor cd051b series with the input, but it changed the output.
(PDF) CD4051B Datasheet download
Is there a better alternative? You show that you’ve got your “Signal” leads connected to the select inputs. Your drawing does not correspond with the nomenclature of the chip. I’ve programmed a small routine that checks for consistency of the signal reading. Cd4501b, the control inputs require CMOS digital levels.
(PDF) CDB Datasheet PDF Download – CMOS Analog Multiplexers / Demultiplexers
I’d try using a different board. But this happens even with 1k resistor on Input 4. I’m using digitalWrite on three pins to select the input port, and then waiting delay for 30ms before doing an analogRead on A0.
LawrenceNK1G, I’m going to read a lot of things, like pots, voltage dividers etc.
Post as a guest Name. I’ve connected the input to 5V for testing stability of the reading.