All Questions
Tagged with level-shifting adc
19
questions
1
vote
2
answers
58
views
Level shifting 7.5-15V range to 0-3.3V range to read on a microcontroller
I have a microcontroller that is meant to read a voltage between 7.5-15 V range. The ADC for the microcontroller is 3.3 V max so I came up with the circuit shown below. It takes in 7.5-15 V input and ...
- 11
1
vote
3
answers
106
views
Level-Shifting not working in Instrumentation Amplifier
I want to shift the measured EMG input signal to the positive side to use ADC. I used the REF input of AD8421 to add an offset of 2.5V. I simulated the circuit below from the AD8421 datasheet on ...
- 25
0
votes
1
answer
123
views
Adjusting signal voltage range for ADC [closed]
Can anyone please help me design a system using an LM324 op-amp to amplify a small voltage signal (from -20 mV to 31.1 mV) to a larger voltage range (0 to 5 V) so that it can be read by an Arduino's ...
-3
votes
1
answer
78
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How do I convert an input of -1 V ... +1 V to an output of 0 V ... +3.5 V using an MCP6022? [closed]
In the simulator I get the expected result:
input: 1 V
output: 2.10 V
But when I use hardware I don't get the correct output voltage.
Can anyone give me answer with best example?
- 1
0
votes
1
answer
55
views
Interfacing LTC2492/6/8 via SPI: is voltage shift needed?
I'm a bit confused with datasheet for LTC2498. It says on page 27, section "Digital Signal Levels":
The LTC2498’s digital interface is easy to use. Its digital
inputs (SDI, fO, CS, and SCK ...
- 103
0
votes
3
answers
233
views
Floating/open input on summing amp
I was tasked with taking a signal that could be of ±2.5 and converting it to 0-5v so it could be read by an ADC. I managed that with a non-inverting summing amp like so:
It worked pretty well but I ...
0
votes
4
answers
4k
views
Level shifter using LM324 Op Amp for ADC reading
I'm want to digitize an +/- 2.5 V signal using an ADS1256. Since the IC can't take negative voltages I designed a level shifter with a LM324 to translate the +/-2.5 V signal to 0 - 5 V but I was only ...
- 1
1
vote
1
answer
250
views
Overcurrent protection relay: how do I simulate it with a Raspberry Pi?
I'm using an RPi and an MCP3208 to simulate an overcurrent relay. I managed to level-shift the AC signal and now I get the voltage reading at 0-3.3 V.
As this is an overCURRENT relay, I was stuck for ...
0
votes
3
answers
599
views
Circuit to adjust -30V to +30V input to 0 to 3.3V for ADC? [duplicate]
Currently working on an oscilloscope design that would require each channel to be able to take in between 30VPP, -30V to +30V, which will go to an ADC which has a maximum input of 3.3V.
What types of ...
- 31
0
votes
3
answers
850
views
Why do I get constant DC 2.5V when level shifting +/- 5V to 0-3.3V (LM741 op amp)?
I'm using RPi 3b+ with ADC (MCP3208) to monitor AC signal (+/- 5V). Since the ADC can't read negative signals, I tried to level shift it using an op amp (LM741).
I tried to make this connection (the ...
0
votes
1
answer
487
views
Using a dual bidirectional I2C bus voltage-level translator
I have a module that uses an ADC powered with 3.3 V (MCP3422). I would like to communicate with it over I2C using an Arduino Mega.
The problem is that the Arduino's I2C is operating at 5 V and the I2C ...
- 197
1
vote
1
answer
468
views
SPI readings always high (1) when connected via bi-directional level shifter [closed]
I am trying to read two gas sensors (MQ4 for methane and MQ7 for carbon monoxide) with my NodeMCU ESP8266. Both sensors require 5v (for the heaters) and have 4 pins (GND, VCC, DO, AO). Digital outputs ...
- 263
1
vote
1
answer
392
views
what protection is required between op amp and 5v adc?
I've created this small circuit to translate voltage drop over a shunt resistor into a usable range for arduino (5v atmega32u4) adc.
This is to measure current out of and into (charging) a 12v ...
- 123
0
votes
1
answer
224
views
Level shifting in OPAMP and HE100T01 interfacing problem
Hi,
I want to measure current of 0-50A. For that, in my application I am using HE100T01 hall effect sensor which can measure current from -100A to +100A(depending on the direction of flow it gives -...
- 13
0
votes
1
answer
790
views
Shrink ADC signal from 5V to 1V?
I have an ADC signal, how do I shrink it to 1V from a 5V sensor like Hall IC for example. Of course, a resistor divider is one method, but will it work reliably as the output is expected between 0 to ...
- 226