Questions tagged [analog-to-digital]

For questions pertaining to signal conversion, either through hardware or software.

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41 views

How many analog pins does a Pi model B + have?

I've read there https://www.raspberrypi.org/documentation/usage/gpio/ that we have 4 pins which can be used as analog, but other people say that we use only 2, so what's the correct answer?
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1answer
37 views

How to connect a geophone to RaspberryPi?

I'm a seismic geophysicist and would like to attach a geophone - which is basically a transducer - to any type of RP. The types and costs of geophones are both variable and extensive (in some cases). ...
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1answer
70 views

PCF8591 with Analog Joystick I/O error when reading input PYTHON

I have been trying to create a retropie unit, and I'm in the midst of writing a script to inject uinput events for the analog axis values. This is the code I've written so far, but the issue is that I ...
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1answer
43 views

AC Current sensing giving low readings (SCT013)

So now that I feel comfortable with using ADCs, I am attempting to measure the AC current with the SCT013 clamp with AC current sensor. Setup: I clamp the SCT013 around the HOT wire of a table lamp ...
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1answer
69 views

Interpreting 10-bit ADC output

I am having difficulty understanding the output from my ADC. I am using a 10-bit MCP3008 with a photoresistor and CT current sensor connected into the analog inputs. I am reading the signals with this ...
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1answer
176 views

Piezo sensor to pick up acoustic instrument signal using Rpi and ADC

I want to read analog inputs from piezo sensors like these on Raspberry using python, which ADC do you advise me with 8 or more channels and how to wire and program it to get digital values?
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2answers
135 views

MCP3008 with photoresistor, analog to digital, noisy readings

I am trying to read values from a photoresistor. I would like to be able to read the 'level' of light, not just a binary signal. So I bought an MCP 3008 analog to digital converter, but I am running ...
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0answers
91 views

Waveshare ADDA (ADS1256) full scale input issues

My question is about a problem of full scale output with the Waveshare ADDA ADS1256 card. I use the Waveshare High-Precision AD/DA Board based on ADS1256 on a Raspberry Pi 3b and the Python3 examples....
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24 views

How can we acquire an analog signal having both positive and negative parts , i.e. a bipolar signal, using Raspberry pi3 B+ module?

I am using raspberry pi 3 B+ board. I have to acquire analog voltage signal having both positive and negative parts, i.e. a bipolar signal How can i acquire this signal with the R-pi? I have tried ...
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1answer
167 views

Reading analog value Raspberry Pi

I am a newbie with the Raspberry Pi. I want to measure Temperature Reading in 12/16 bit resolution. can someone guide me how CKT should be designed and How can read value using software. usually ...
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108 views

Input/output error using Python ADS1115, and a Raspberry Pi

I am trying to read an analog signal using ADS1115 and a raspberry pi. Sometimes it reads and some time result into error. Following is the code snippet response = {} adc = Adafruit_ADS1x15.ADS1115(...
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1answer
89 views

How to read ADC with low restance range

Does anyone have any ideas on how I can use RPI with ADC to measure a tank level sensor which has a range of only 20 to 200 ohm.
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2answers
230 views

Reading analog sensor value of 0-10Vdc with 12/16bit resolution

Dear all, I am using below model for reading analog value. I wanted to measure 0-10VDc &0-30Vdc .i wanted use it application where accuracy important. if i wanted to 12/16bit resolution of value ...
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1answer
680 views

Seeed ADC (ADS1115) with Raspberry Pi 3 B+to read voltage values using python3

I'm using a Seeed 4-Channel 16-Bit ADC (ADS1115) for Raspberry Pi with a Stretch installed Raspberry Pi 3 B+ and successfully configured following below guidelines & GitHub. http://wiki....
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53 views

Cant read both SPI Buses of Raspberry Pi 3B+

I want to read 3 analogue sensors simultaneously. I have successfully connected 2 sensors using a MCP 3002 A/D converter which is connected to CS0 of SPI 0 of raspberry pi and I have activated 3 more ...
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2answers
472 views

Reading Voltage Input on ADC

I'm thinking of using the Waveshare ADC board with a RaspPi 3 to monitor the current driving a DC brushless motor. I've run through the waveshare examples, and I can handle reading inputs ...
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1answer
303 views

Waveshare ADC Board negative value issue

I'm using this Raspberry Pi High-Precision AD/DA Expansion Board from waveshare. I have some questions regarding its ADC (model name: ADS1256) unable to give out negative value. Specifically, only ...
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1answer
127 views

Waveshare ADC Board Full Scale Issues (ADS1256)

I am using the Waveshare High-Precision AD/DA Board with my Pi to read an analogue 0-5v signal. I am using a 5V reference voltage, but I can't seem to read full scale. Applying 0V reads out -344 ...
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2answers
660 views

5V-3.3V Sensors Confusion

Most of the sensors available in the market requires 3.3V-5V. The GPIO of the Raspberry Pi is 3.3V max only and not 5V tolerant. I have seen tutorials around the internet that they supply the sensors ...
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1answer
2k views

Raspberry Pi Current & Voltage Sensors (10A rating and ~40V respectively)

I've been searching through multiple forums, and gone to different links online trying to find a "cheap" solution to my question. I am currently trying to monitor the current and voltage of an ...
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1answer
105 views

Use ADC with add_event_detect to detect voltage rising

I need to find a solution for my project. Basically I just need to define if there is a voltage or not by using GPIO event detection. For my basic scheme I used 3.3v pin and one of the GPIO pin for ...
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29 views

Analog input together with LoRaWAN

I am looking for a hardware configuration enabling me to read an analog input from ammeter and collect the historical data and send them over LoRa to a server. So I could use something like Monarco ...
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2answers
68 views

Get different values from potentiometer even not touching

I have a potentiometer that is used to adjust volume level along with MCP3008 but even if I don't touch it, its values are going and coming as following. Press Ctrl-C to quit... Channel 0 minus 1: ...
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2answers
411 views

MCP3008 analogue digital converter… how can I use it for the complete opposite of what it was made for?

I have set up an mcp3008 chip and a slide pot on my pi because I wanted a nice old fashioned volume control, and all of that seems to working fine and I am quite happy with it. Now I have 7 ...
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2answers
183 views

How the fluctuation in MPC3008 ADC unused channels is explained?

I am using mpc3008 in order to convert the analogue signal of two sensors, for a rpi3. The sensors are, the SEN0189 turbidity sensor and the SEN0244 TDS sensor. The code I am using is the ...
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1answer
420 views

Raspberry Pi AD/DA converter

I am currently working on sensors and I'd like to read the sensor data into my Raspberry Pi. However, I have some difficulties with the Waveshare High-Precision-Board which I'm using. I just don't ...
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1answer
250 views

Raspberry Pi GPIO & Analog Sensors

I am fairly new to Raspberry and Coding/electro-engineering in general but wanna get it done anyways. I've some questions regarding reading data from analog sensors. Background: I got an AD/DA-high-...
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2answers
322 views

pi4j implementation for SPI communications with MCP3008 reading zeros

I have hardwired a MCP3008 IC into the SPI input on a Raspberry Pi3. MCP3008 is wired as follows: pin 10 (CS) to Pi GPIO_10 (pin 24) this is CE0 pin 11 (Din) to Pi GPIO_12 (pin 19) this is MOSI ...
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1answer
1k views

Correct wiring for multiple analogue sensors?

I’ve recently embarked upon a project that I’ve wanted to do for a while. My overall plan is to have 3 planting shelves; each will have its own soil moisture sensor, water pipe and LED lighting. The ...
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1answer
2k views

Reading data from MCP3551 via SPI

I am trying to read data via SPI from an ozone sensor that I have connected to the Raspberry Pi's GPIO. This set up uses a Mikro Pi click shield and Mikro Ozone 2 click sensor. The output of the ...
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1answer
229 views

Force Sensing Resistor with Raspberry Pi

I have a school project where I have to make a car park with a fully functional parking lot checking system. The FSRs job is to detect any weight and send a signal to the raspberry pi that the ...
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1answer
688 views

Reading values using MCP3002

I'm trying to use MCP3002 for the first time, and can't seem to get the basics to work I've been following this guide and am pretty certain that all my connections are right (updated photo below). ...
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2answers
845 views

problem with adc mcp3008 & ads1115

My raspberry 3Bs seem to have problems with their I2C and SPI bus. a. I tried MCP3008 using SPI connected with light sensor and temp sensor, the output on channel 0 &1 is only outputting zeros ...
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462 views

ADC for the raspberry pi zero w

Does anyone know of an ADC that I can use for a joystick to connect to the raspberry pi zero w? I have the adafruit pitft plus 2.8 resistive touch screen installed and it uses all the SPI pins I think....
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87 views

ADC Hat with 8 differential channels and 24 bit resolution for 100 - 200 SPS (Hz)

I'm sorry if there's a similar post, I could not find it (them). As the title implies, I'm looking for an ADC hat for the Rapspberry Pi 3 Model B with 8 differential channels to sample up to 200 SPS (...
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352 views

Interface AD7193 with Raspberry Pi

I have been trying to interface an ADC with raspberry Pi namely AD7193 via SPI . For that I have enabled my SPI and installed spidev on my pi. but i dont know what to do next in order to get the ...
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2answers
2k views

How to achieve a high sampling speed using an ADC with Raspberry Pi?

So, I am using the LTC 2366, 3 MSPS ADC and using the code given below, was able to achieve a sampling rate of about 380 KSPS. #include <stdio.h> #include <time.h> #include <bcm2835.h&...
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506 views

soil moisture sensor analog output is 0

I'm a newbie to pi and using it for my final year project to display moisture value of soil using the soil moisture sensor. I have followed this tutorial website for the connection and code and ...
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248 views

How to connect sensor to Raspi via poor man’s a/d converter?

TL/DR: I’m using this and there are things I don’t understand about this circuit. Ultimately I’d like to read data from this sensor, but all I get is gibberish. Please, help. I have set up “poor man’...
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1answer
487 views

combining sound card and ADC (I2C)

Am thinking of using an Audio Injector sound card, which apparently has a two-channel high-precision ADC. In addition I will be needing to read two different variable resistances. One of these has two ...
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1answer
253 views

Trouble with Flex Sensor and MCP3008

I'm working on a project currently, though things aren't quite working so I would like whoever's advice. So, to put it briefly, I'm using a Sparkfun Flex Sensor and an MCP3008 hooked up via a ...
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1answer
1k views

Measure ac power with invasive ct sensor 30A

I am measuring power(watt) with a non invasive sensor SF-SEN-11005 30A. After calibrating on 150 watt it works fine. When I disconnect the sensor I expect a zero value, which is not the case. The ...
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1answer
161 views

How to connect PCF8951 with Raspberry Pi

I want to connect PCF8951 with Raspberry Pi I'm following: 1: https://www.sunfounder.com/learn/sensor-kit-v2-0-for-raspberry-pi-b-plus/lesson-13-pcf8591-sensor-kit-v2-0-for-b-plus.html But when ...
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1answer
90 views

MC3008 vs. Justboom amp

I just ordered the Justboom AMP Zero pHAT. My project needs reading analog signals, too. So I also ordered a MCP3008 in order to convert from analog to digital. My question: is it possible to connect ...
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1answer
84 views

Odd results when measuring timing

Some introduction to my case: I have an ADC (MCP3008) connected to my RasPi with SPI. To that ADC I have connected 2 multiplexers (4051 dip-chips, I plan on connecting 8 multiplexers eventually). So ...
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1answer
874 views

No values from mcp3008

I can't get the mcp3008 to work. I have the wiring as in the pictures (hardware wiring), and I've re-checked it a few times, can't find any mistakes there. The left side of the mcp3008 on the picture ...
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1answer
151 views

Using a 28-Channel PIC microcontroller with the RP3

TL;DR: I have virtually no knowledge of electrical engineering and I want to know if I can connect this ADC to a Raspberry Pi 3 and be able to read 15+ piezoelectric sensors at a very low latency (≤ ...
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1answer
315 views

How to use the LTC2365 ADC with the BCM2835 library?

When I used the library with MCP3008 ADC, this is the code that I used: #include <stdio.h> #include <time.h> #include <bcm2835.h> int main(int argc, char **argv) { float seconds; ...
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2answers
444 views

How can I use the raspberry pi to read analog voltages

I have a device that puts out 0-5v based on what it's doing. How can I use the raspberry pi to read those voltages? I would then have scripts do whatever is needed or maybe display via a webpage. I ...
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1answer
746 views

Measuring 0-5 V DC with a good accuracy (~10 mV) using a Raspberry Pi

I'm totally new to Raspberry Pi and I want to use it for an important school project. My aim is to build a laser-seismograph using a laser pointer and 4 photodiodes which basically measure the laser'...