Tagged Questions

-2
votes
0answers
62 views

How to stabilize the value of ADC in PIC microcontroller? [closed]

I have been designing auto range multimeter using PIC microcontroller. Having problem in the auto range switching due to the ADC reading since ADC reading for particular voltage varies by 100 to 150 ...
2
votes
2answers
125 views

ExternalDifferential ADC Values for PIC

I have a temperature sensor design that I'm using as a reference. It takes 2 RTD sensors and reads their values with a Dual Channel 16-bit Differential ADC. The ADC interfaces through the SPI bus. ...
2
votes
1answer
171 views

Reading analog input pic18

I'm trying to read an analog input on a PIC18F65J11, and I'm having trouble. I don't think the pin is set up correctly because I'm getting a 0 for the value I read in, and the input is measured to be ...
3
votes
3answers
151 views

Requirement for more ADC inputs than micrcontroller has available

I have a requirement to read an analogue value from 20 sources. I am using a PIC microcontroller that has 11 available ADC inputs. I have a number spare IO ports, I am thinking of using an analogue ...
1
vote
1answer
93 views

PIC18F26K80 ADC calibration using Bandgap

The PIC18F26K80 errata sheet mentions that the ADC has an offset error as high as 25 bits and discusses one workaround copied from the errata here: A/D Offset The A/D may have high offset error, up ...
-1
votes
1answer
431 views

Can we connect an external ADC with PIC16F877A? Or it's compulsory to use the internal ADC of the PIC?

I am making project measuring pollution. I want to display carbon particles in parts per million on an LCD by using mq7 sensor. Can I use an external ADC (ADC0808)? Or do I have to use the internal ...
0
votes
2answers
197 views

interfacing MMA7361L with PIC ADC

I'm trying to interface an mma7361L accelerometer (on breakout board with caps) to the analog inputs of an 18f46k20. According to the PIC datasheet, the Vmax input voltage is Vdd + 0.3 which means I ...
2
votes
3answers
499 views

c18 coding advice / braces error / function declaration help

I have almost NO experience coding so please excuse the crude style and verbose commenting. I am trying to sample from 4 sensors (1 every 15 minutes). I thought it would be more efficient to have the ...
4
votes
4answers
423 views

Does an external interrupt interrupt ADC or does ADC stall interrupt?

I'm working on an RTC application with a 1Hz clock attached to the external interrupt pin on a PIC16f887. I also have continuous ADC operations happening along with the 1Hz clock. My question is ...
-1
votes
2answers
1k views

Convert an analog audio signal to digital with a PIC and send the data through serial to a PC

I want to convert an analog audio signal to digital signal and send it to serial input in my computer. How can I do this? Microcontroller used: PIC18f452
0
votes
1answer
542 views

How to configure the analog port in PIC18F?

How to configure the analog port of [PIC18F452][1] to read analog values? they need to change their status while running the program..
6
votes
2answers
748 views

Bluetooth simple oscilloscope

I was thinking to make a simple oscilloscope which can measure at least 2MHz signals, that would be enough, and it will be connected to a PC, or Android device. First, I tought to use USB to connect ...
2
votes
1answer
398 views

PIC analog to digital converter to measure more than one battery voltage (with different grounds)

I'm trying to build a circuit that can scale down several lipo batteries (5 cell) up to 22V max to be safe to either 3.3V or 5V for measuring with a PIC microcontroller using the analog to digital ...
3
votes
1answer
551 views

PIC18F4520 ADC Conversion in MC18

I have a dilemma. I need to read ADC values from PIC18F4520. My configuration, and code, is as follows: ...
6
votes
1answer
255 views

Is connecting the V_REF- pin for a dsPIC mandatory?

While trying to get the ADC of the dsPICF3013 working (I am getting only zeros back), I have studied the datasheet and the (I will call it) ADC reference for the dsPIC30F family. Previously I only ...
2
votes
2answers
666 views

Microcontroller with ADC and capable of SPI communication

I am designing a system where Analog Signal ---> (ADC- Digital Data )---> UWB chip mostly WSR601 or AL6301/AL5100 Chipset Note (1): UWB is an abbrieviation for Ultra Wide Band wireless ...
5
votes
2answers
619 views

How to ground a floating ADC input

I have an ADC input that may be connected to an external sensor (based on how the user configures it). If I leave the input floating, I get a wide range of ADC values. Is there a way to weakly ...
6
votes
6answers
2k views

How do I sample a -2 V to +2 V analog signal with a PIC microcontroller?

I am using a PIC micro with a 10bit ADC to take readings from an analog signal with a frequency less than 300 hz. However that analog signal is in the range of -2 V and +2 V. How can I condition the ...
5
votes
4answers
1k views

High Quality Audio ADC and DAC with Embedded

I am starting work on a project where I want to do some DSP using an embedded solution ideally with very low latency as it will be in a real time environment. In addition I want high quality, ...
22
votes
5answers
6k views

How do I measure a negative voltage with a ADC?

I am working with a PIC micro-controller with inbuilt 10bit ADC and want to measure a voltage in the range of -1 to -3Volts. I thought of using an op-amp in the inverting mode to make voltage positive ...