Pages: . Topic: I need many, many, many analog inputs Read times previous topic - next topic. I need many, many, many analog inputs Hi, I have an idea where I need to read data from many, many, many analog inputs. But taking the Uno as example, I can connect 6 Analog inputs, each of them connected to a 16 channel multiplexer, which will give med 96 analog inputs. A simliar calculation would give me channels using the MEGA. But what if I said I need inputs, how would I solve that?
Is there a way I can "cluster" multiple Arduino boards and have them to work together, i. Maybe I should not use Arduino for this? Re: I need many, many, many analog inputs What is the application if you do not mind me asking? In theory you could have a giant mux array and squash all the inputs down to 1 analog input pin.
The performance would likely be terrible but if you do not need a fast refresh rate on each input it may work. Quote from: jwallinder on Nov 20,pm. Don't PM me for help as I will ignore it. I'm thinking of using photosensors diode, transistor or resistor? To achieve high resolution in aspect of length I need many many many of them But someone here might have a better solution? Now with Unlimited Eagle board sizes! Can be read much faster than uS conversion of Arduino input.
Use multiple banks of analog muxes into external ADC:. Analog muxing wihth external ADC. Probably want to go surface mount. Lot of input wires to bring into 1 place. Maybe do 20 boards with 32 muxes, 2 ADCs, then can spread out a little more and only have inputs into each card. Connect up SPI bus between cards in smart way.
Quote from: jwallinder on Nov 21,am.Excel vba open pdf specific page
Code: [Select].The data for each input or output is kept in the corresponding Input or Output register. The polarity of the Input Port register can be inverted with the Polarity Inversion register. All registers can be read by the system master.
The system demonstrates the simplicity of monitoring four inputs and applying the level to associated outputs. The devices on the demo board operate in the I2C slave mode and can easily be connected to virtually any demo or development board by connecting the For pricing and availability, contact Microchip Local Sales. Sampling Options Buy Now. Development Environment. Similar Devices. Additional Features. Jump to: Select type. Data Sheets.
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Buy from Microchip. Grid View. Package Type.Pages: . Maurello Guest. Multiplexing potentiometers. Hi, I sought a whole week an answer about my question but found no one so i finally decided to open a new thread hoping I'm not doubling an existing one I have an Arduino UNO and I need to connect up to eight potentiometers, but i need it to be modular each pot as a single module due to some different uses and space problems The problem is I'm not sure how to make the board recognize which pot I'm using, because even if I'm using just one analog input on the board i need every single module to control a different thing: e.
I was thinking about using for every module one analog multiplexer like a b which I already have and a priority encoder an MCB or an SN74HCN : the encoder will recognize which line I'm activating by changing the potentiometer's state between the one on the module or the one connected in series to it, and send to the multiplexer's address input the bit value of the corresponding port.How do i use speed dial on my alcatel phone
The multiplexer will then send the analog value to the board input. Is this a possible working configuration or am I totally wrong? Could they be a better choice for my project? Re: Multiplexing potentiometers. Thank you, but I tought of the more complex method because of Quote from: Maurello on Apr 01,pm. Well I think a need to reconsider my priorities, let's put aside the modular thing for the moment.
I have attached the schematic I hope I did it right and here's the code Code: [Select]. Code: [Select]. Now with Unlimited Eagle board sizes! What's with folks using obsolete parts? Easy to write a for:loop to do that. Ok, no problem using using something on hand already, I've done the same. Quote from: Maurello on Apr 03,pm.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
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If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. This is a collection of smaller programs and scripts to display "inline" in Adafruit Learning System guides. The code here is partially checked by Travis CI against Pylint for CircuitPython code or the Arduino compilation process using travis-ci-arduino. Code in directories containing a file called. Code in directories containing a.
Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. Programs and scripts to display "inline" in Adafruit Learning System guides. Branch: master. Find file.
Sign in Sign up. Go back. Launching Xcode If nothing happens, download Xcode and try again. Latest commit. Latest commit 2f2fd55 Apr 15, Introduction This is a collection of smaller programs and scripts to display "inline" in Adafruit Learning System guides. Testing The code here is partially checked by Travis CI against Pylint for CircuitPython code or the Arduino compilation process using travis-ci-arduino.
This is a work in progress. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. Jan 8, Jan 10, We have covered all the Tutorials in simple and detailed manner, so that anyone, whether he has worked with Raspberry Pi or not, can learn from this Series easily. And after going through all the tutorials you will be able to build some High Level projects using Raspberry Pi. So here we are designing first application based on the previous tutorials.
And you can monitor the Readings on computer. So if we want to interface any analog sensors we need an ADC conversion unit. So go through it before building this Room Temperature Thermometer. ADC is a chip designed to convert analog signal in to 8 bit digital data. This chip is one of the popular series of ADC. The resolution of this chip changes based on the reference voltage we choose, we will talk more about it later. Now for Reading Temperature of Roomwe need a sensor.
Here we are going to use LM35 Temperature Sensor. As shown in figure, LM35 is a three pin transistor like device.
The pins are numbered as. This sensor provides variable voltage at the output, based on temperature. The LM35 output has lot of voltage fluctuations; so a uF capacitor is used to smooth out the output, as shown in the figure. Without this there will be lot of fluctuations at output. The chip works on RC Resistor-Capacitor oscillator clock. The important thing to remember here is the capacitor C2 can be changed to a lower value for higher rate of ADC conversion.
However with higher speed there will be decrease in accuracy. So if the application requires higher accuracy, choose the capacitor with higher value and for higher speed choose the capacitor with lower value. So we will have a maximum of 1. Use the voltmeter to get the accurate voltage.
Also check Humidity and Temperature Measurement using Arduino. Sometimes, when the GPIO pins, which we are trying to use, might be doing some other functions. In that case, we will receive warnings while executing the program. Below command tells the PI to ignore the warnings and proceed with the program. We are setting 8 pins as input pins. We will detect 8 bit of ADC data by these pins. In case the condition in the braces is true, the statements inside the loop will be executed once.
Below command is used as forever loop, with this command the statements inside this loop will be executed continuously. Before executing program, lets talks what is happening in the circuit as a Summary. First LM35 sensor detects the room temperature and provides an analog voltage at its output. The program converts the count to temperature value and displays it on the screen.German gun proof marks
The typical temperature read by PI is shown below. IN IO. Recommended Posts. Didn't Make it to embedded world ? No problem!This gives you a total of 17 pins to play with but what if you need more?
This is a device that allows you to control a number of ports using data you send to the device. Other people have has lots of success using I2C devices so I decided to give one a try. A port expander takes the data and controls the appropriate pins.
The switch resistor is 10Kohm and ties the input to ground. This insures the input is Low until the switch it pressed. Pressing the switch places 3. The resistor stops this resulting in a short circuit between the two power rails. To use I2C on the Pi you need to enable a few things in Raspbian as by default it is not enabled. Make sure 3. Power up the Pi and wait for it to boot.
Why the difference? This changed the device number that needs to be used with I2C from 0 to 1. This is because the three address pins are set low. If you set A0 high the address would become 0x21 33 in decimal. Great tutorial, thanks. Presumably this approach also affords some protection against short circuits etc to the gpio pins? This is great, for those of us with failing eyesite can you give the value of the resistors you used.
They are ohm. Thanks for the fast response, what about the other resistor between the switch and ground what does this do? The switch resistor is 10Kohm. When the switch is not being pressed it connects the input to ground Low.Call of cthulhu, steam ha svelato la data duscita del gioco
When the switch is pressed the input sees 3. Current flows through the resistor but it is only 3. I have worked my way through all your excellent tutorials and I now think I have all I need for my project.
I am building a wooden chess computer that senses moves using 64 reed switches, and signals moves with 64 LEDS. Even with multiplexing I need 24 inputs. In my original project I used an Arduino to provide the inputs, communicating serially to the RPI, but now I should be able to do everything on the Pi.
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I have to buy it from online stores like mouser. If the resolution isn't too important have a look at PCF based modules. They are only 8-bit but have four input channels. Please note that many products sold as compatible with Arduinios will also be compatible with the Pi.
An important check is that any outputs from the product are, or can be made, 3V3 safe. The Pi has two I2C buses. The Pi also has two SPI buses. The standard Linux driver only supports the main SPI. My pigpio library supports both. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered.
MCP alternative Ask Question. Asked 5 years, 1 month ago. Active 4 years, 10 months ago. Viewed 3k times.Raspberry Pi y MCP3008
Is there any direct cheap alternative of MCP which is widely available? Is there any alternative circuit design that I can do without MCP? Have you tried eBay? Or a domestic supplier?
I bet you any retailer will mail you whatever you want if you are willing to gamble on paying up front. Active Oldest Votes. I'd look on eBay for less expensive sources for ADCs. Is there any? Andno I dont want to use an arduino. That module may be used on an Arduino.