Tagged Questions

5
votes
4answers
183 views

Temperature sensor recommendation

I am builing a homemade reflow oven, but I cant find a good and cheap temperature sensor that can survive the temperatures necessary for reflow (~250ºC or 482ºF). Does anyone have a recommendation? I ...
3
votes
2answers
179 views

Yet another Weighing Scale Project

I am taking some off the shelf weighing scales and would like to interface a PIC to them for display and wireless transfer... The scales have four 3-wire load cells, one in each corner, and look very ...
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 ...
1
vote
1answer
320 views

pH sensor with DS18B20 temp compensation on PIC

I am trying to build a circuit that interfaces a standard pH electrode to a PIC (18F4550). I need the PIC to also use a DS18B20 for temp reading and use that data to correct the pH reading. I ...
1
vote
1answer
129 views

Building block components for robot sensors and controllers

I'm planning on building a robot using Microchip PIC 16-bit MCUs, which I'm familiar with, and for which I have supporting hardware (demo boards, programmer, debugger, etc). After spending hours ...
2
votes
1answer
229 views

Adding an Obstacle Avoidance Sensor to a PIC

I have a PIC16F917 microcontroller that is used to operate a robot. I would like to add a sensor to it that will allow me to detect obstacles. How can I determine what sensor I should be using for ...
0
votes
1answer
225 views

PIC to measure Pressure sensor “MBS 1200”

I have a pressure sensor MBS 1200. I want to connect the same to a PIC micro controller for an application. Can you please suggest a circuit to do the same. I am not familiar with current output ...
1
vote
1answer
88 views

Need formula for core detection

I need to detect when an irrigation head is functioning, non-invasive. The heads are the Toro brand and when activated a cylindrical shaft extends several inches above ground. This shaft is a ...
1
vote
1answer
435 views

Split core current transformer

I'm looking for a simple, cheap device to detect low ac current. It will be used to detect irrigation valves. These valves operate @ 24 vac (60 hz) typically 100 - 200ma. I just need a go-no go ...
4
votes
3answers
390 views

Pressure/Force sensor

One of my students are planning to make a simple musical keyboard with PIC microcontrolers, using MIDI output. The main problem now is about the pressure/force sensor. I've found a good alternative ...
5
votes
3answers
234 views

What external sensor could detect if a cd-tray had opened?

What would be a sensor that I could use to detect if my desktop's CD tray has opened? There are so many sensors to choose from in the Digikey catalog. Should I use a mechanical component? A ...
4
votes
4answers
2k views

Reading RTD Temperature Sensor

I've had a number of issues getting good stable analog readings from an RTD temperature sensor. The temperature readings have a tendency to bounce as much as +/- 5 Deg C. The circuit is very basic, a ...