Tagged Questions

2
votes
1answer
94 views

Arduino Pro Micro: how to access A1

I have an Arduino ProMicro 5V 16MHz board from sparkfun. I have a 3Cell LiPo powering the entire thing (via the relevant regulator bringing it down to 5V). This is part of a TriCopter. I tap the 12V ...
1
vote
2answers
561 views

Negative Voltage Level Shifting to an ADC

I am currently building a project that uses an AD595 analog devices chip to linearize the output of the Thermocouple sensor to 10mv/deg C. This output is to be connected to the ADC input of a Zigbee ...
1
vote
2answers
115 views

Measuring forklift battery's voltage

I'm trying to measure a fork's lift battery by an ADC. The problem that the output voltage isn't predictable and not constant, so that I can make a constant voltag divider. What I have measure is it ...
1
vote
1answer
130 views

10-bit digital representation with SPDT switches and voltage division

I'm completely new to electronics, and have been trying to come up with a way to connect 10 SPDT switches to a single analog pin on my Ardiono Mega 2560 (and off course connected to 5V and Ground). ...
3
votes
2answers
651 views

Voltage divider for Xbee's ADC - what resistor values?

I have an analog sensor which outputs a value in range 0-3V depending on soil moisture. The Xbee's ADC requires a value between 0 and 1.2V. I was thinking about using a simple voltage divider: ...
1
vote
1answer
241 views

Creating the proper Vref for a thermistor

I have a 10kΩ @ 25°C NTC thermistor for temperature measurement. Problem is, I only have 3.3 V on the board and the ADC inside my micro-controller has a Vref of 1.6 V. I tried to make a ...
1
vote
1answer
205 views

Ripple factor detection and measurement

How to measure ripple factor automatically for a pulsating dc output(0-300 v)?
2
votes
3answers
234 views

Current Drain on ADC

I am looking at a MCP3008 datasheet and it says that it has a maximum current drain of 150uA, and a typical current drain of 100uA. I am building a voltage divider to knock down 96V to 3V. As this ...
4
votes
2answers
316 views

ADC reading 96V DC

I have a 96volt DC line, and I am trying to get it down to 3.3volts to put into an opamp, and then to put into an ADC so that I can read the voltage on the line. The 96volt line will be prone to ...
4
votes
4answers
594 views

Set up an array of pressure sensors

I am working with a flexiforce pressure sensor 25 lb. I have to run 6 of them in parallel and I'm using an Arduino Uno. I'm not an electrical engineer (read: I'm a computer science major) and this is ...
2
votes
3answers
661 views

LPC2148 ADC problem with voltage divider for battery

edit: solution found with our new board revision; outside of careless mistakes, buffering the signal with an op amp seems to have resolved the issue (as suggested by Joshua below). I am working with ...
2
votes
2answers
952 views

Combined ADC scaling and offset with variable input voltage ranges

I am trying to create a circuit which will allow me to scale and offset a voltage (be it AC or DC) to within the range of the Arduino ADC. The voltage could be anything between + and - 250V, but I ...