9
votes
Using 5 volts on an mcp3008
First, lets check the characteristics of the MCP3008 again:
Single supply operation: V_dd = 2.7V to 5.5V
All Inputs and Outputs < V_dd + 0.6V (this should include V_ref)
200 ksps max. sampling ...
- 15.8k
7
votes
MCP3008 analogue digital converter... how can I use it for the complete opposite of what it was made for?
You will have to use a Pull-Up resistor to get clean difference between the two desired states.
This way you will have no floating input but either VCC (3.3V) or GND (0.0V) at the input of your ...
- 2,702
7
votes
Accepted
How many analog pins does a Pi model B + have?
The Raspberry Pi has NO analogue GPIO. All the GPIO are digital only.
Perhaps you are being confused by some Arduino terminology. If a digital GPIO is used to generate PWM they often incorrectly ...
- 70.6k
6
votes
Analog to Digital Converter (ADC)
The Raspberry Pi has no analogue GPIO.
Therefore you need to buy an ADC.
You need to research the best ADC for yourself but I find it unlikely you will manage 1 Msps on the Pi.
- 70.6k
5
votes
connect two mcp3002 IC to raspberry pi3 model B
SPI is a bus.
Use the same connections between the Pi and the chips for Vcc, ground, MOSI, MISO, and SCLK.
Use CE0 for one chip and CE1 for the other.
The software uses the slave select line (CE0/...
- 70.6k
5
votes
How to use Rpi python to control PCM1802 24-bit HiFi stereo ADC and MAX4466 microphone amplifier
Answer
Introduction
I am a PCM1802 24-bit ADC newbie, never used it before. It is a complicated device and its operation needs a long explanation. For now, I am only trying to give quick and dirty ...
- 4,645
5
votes
Voltage monitoring of battery pack (i.e. before voltage regulation)
The PiCheckVoltage project may be stale for a reason. It strikes me as a bit over-complicated for the situation you've described. However, parts of the code may be useful. Here are some alternatives ...
- 21.2k
5
votes
Voltage monitoring of battery pack (i.e. before voltage regulation)
In my Raspberry Pi tablet, I use very low frequency PWM to measure the battery voltage. One half of a dual voltage comparator was set up as a sawtooth oscillator operating at approximately 100Hz. The ...
4
votes
Accepted
Raspberry Pi, LM35 and MCP3008
You can power the sensors from 5V and also power the MCP3008 from 5V.
You need to use a voltage divider on the MISO (Master In Slave Out) line from the ADC to the Pi so that the 5V ADC digital signal ...
- 70.6k
4
votes
How the fluctuation in MPC3008 ADC unused channels is explained?
I assume you have not connected anything to those inputs. The inputs will therefore be floating and return random results.
It's probably simplest to connect unused inputs to ground if you do not ...
- 70.6k
3
votes
Accepted
Hardware for reading a large number of analog inputs?
There is a little more to know than "need to read a total of 64 analog voltages" to make an educated guess here. Those are especially the resolution and the sampling rate. Related with the sampling ...
- 15.8k
3
votes
Hardware for reading a large number of analog inputs?
Even though this question is better asked on Electronics.StackExchange.com, here are some thoughts:
You could get nine 8:1 Multiplexers/Demultiplexers like this one: http://www.digikey.com/product-...
- 5,033
3
votes
Accepted
Rasberry Pi 2 analog inputs
You can use the Raspberry Pi for the webserver. You have a variety of programming lanugauges you could use, like Python, C/C++ even C# (in Linux using Mono) or Windows IoT.
It would be allot easier ...
- 17.3k
3
votes
Can I do anything with a pre-wired photo resistor and no additional A/D converter?
I won't claim this is a very complete answer, but here goes:
I tried simply connecting my module...
The capacitor in that Adafruit demo plays a vital role; it's what creates a fluctuating high/low ...
- 58.5k
3
votes
Accepted
how to change read channels on PCF8591
You control the device by sending it two bytes. The first is the command code. The second is the byte to write to the digital to analogue converter.
The command byte is structured as follows.
7 6 ...
- 70.6k
3
votes
Accepted
Why is the `spi device` library faster than the Adafruit's MCP3008 library?
The SPI library uses the SPI hardware.
I suspect the Adafruit code was written before the SPI library was written and uses a technique called bit banging to access the MCP3008. Bit banging will be ...
- 70.6k
3
votes
Force Sensing Resistor with Raspberry Pi
The easiest way is to pick a number (actually 2) between 0 and 1023. A value > x == occupied. A value < y == unoccupied.
x should by high enough to ignore someone walking over the parking space. ...
- 31
3
votes
Accepted
Rpi Current Sensing Using ACS712 and INA219
########## The Question ##########
Cheap Solution for Rpi ACS712 Current Sensing/Logging Problem
I've been searching through multiple forums, and gone to different
links online trying to find a "...
- 4,645
3
votes
5V-3.3V Sensors Confusion
There is only one thing to bear in mind. Only feed between 0 and 3.3V to a Pi GPIO. Anything outside that range will eventually damage the GPIO and then the Pi.
You have to consider each device you ...
- 70.6k
3
votes
Voltage monitoring of battery pack (i.e. before voltage regulation)
One option would be to use an MCP3002 ADC (2 channel analogue to digital converter).
Use a voltage divider circuit (2 resistors) to convert your battery voltage to a voltage range upto 3.3V. Feed this ...
- 6,847
3
votes
Accepted
Full duplex SPI communication with an ADC using the pigpio library
If you want to send 8 NOP bits send a byte containing 0xFF.
count, rx_data = spi_xfer(handle, [0xff])
If you want to send 16 NOP bits send two bytes containing 0xFF.
count, rx_data = spi_xfer(handle, [...
- 70.6k
3
votes
Real time + High frequency ADC data reading with Raspberry Pi 4
Linux is not a real-time operating system.
You will not be able to achieve consistent sampling times using the standard Linux environment.
I have used DMA bit banging to get accurately timed SPI ...
- 70.6k
2
votes
Accepted
Data logging during power loss
My question is, how can I make sure the data is saved to the file even if there is power loss?
The short answer is "you can't". RAM is a volatile storage medium, once it loses power, it loses data. ...
- 11.9k
2
votes
Accepted
How fast can I read two analogue sensors using MCP3008 ADC?
The standard Pi Linux SPI driver can execute about 20 thousand transactions per second.
So to read two channels from a MCP3008 should take about 0.1 milliseconds.
- 70.6k
2
votes
Accepted
Easiest way to listen to analog connection?
Being a complete noob here when it comes to electrical engineering, what I needed was an "Analog to Digital Converter" abbreviated as ADC.
https://en.wikipedia.org/wiki/Analog-to-digital_converter
...
- 159
2
votes
Analog to Digital Converter (ADC)
As per previous answers, RPi's do not have an ADC. There are a number of ways that it can be done, but they all involve an external module or add-on circuit of some kind. What needs to be implemented ...
- 21
2
votes
Accepted
Pi for control 20 analog outputs
From my knowledge there is no ready to buy solution.
I would recommend to use a I2C bus with the required converters connected to it.
D/A converters example LTC2637 is a 8-Channel, 12-Bit Digital to ...
- 2,726
2
votes
Does the Sense HAT have an ADC?
The SenseHAT does not have any analog inputs. The ideal solution is to remove the standard GPIO header and fit an extra long, stacking one through the holes.
You can then look at wiring up, for ...
- 4,499
2
votes
Accepted
How can I use the raspberry pi to read analog voltages
You need an ADC (Analogue to Digital Converter).
Google MCP3008 (a popular 10-bit 8 channel ADC) as an example.
- 70.6k
Only top scored, non community-wiki answers of a minimum length are eligible