breadboardcircuit analysiscircuit-design
I'm really confused on how to implement this circuit diagram on a breadboard. The short wire indicated with v1 is the confusing part. I tried to make it on a breadboard but I can't seem to get it. Any hints?
EDIT: This is my attempt at building the circuit. But I'm not sure if it's right and I can't test it because I do not have a multimeter. Any comments/tips? I don't have any 100k resistors, so I just used two random ones, but everything is labelled.
There's veroboard, perfboard and stripboard.
With these, you can either cut tracks or wire wrap.
First, this device is not a thermoresistor, better known as a thermistor. It is a integrated temperature sensor that produces a voltage output. Whatever is inside that measures the temperature is irrelevant to you, and quite unlikely to be a thermistor.
Second, it's called a schematic.
As for why you're not getting the expected reading, the obvious answer is that you forgot to connect the output of the sensor to a A/D input of the microcontroller. You only have power and ground connected. Hook up the second sensor just like the first, except connect its output to a different A/D input.
Another issue is that some variants of this device have a shutdown input. Make sure that it either floats to the appropriate level, or that you tie it to the appropriate level explicitly. The datasheet should tell you if it is OK to leave open.
Also, you are missing the bypass cap. Put a 1 µF or so ceramic cap accross the power and ground of each sensor, as physically close to the sensor with as short leads as you can manage. I'd probably put a small chip inductor in series with the supply first, then a 10 µF cap around the part. Integrated parts like this usually have some power supply noise rejection capability, but a chip inductor and cap will clean up the power the sensor sees, and are cheap and small.
Best Answer
That's a schematic diagram, not a wiring diagram so position of components and length of "wires" on the diagram are (usually) not significant. The purpose of the diagram is to convey the working or operation of the circuit rather than show you how to lay it out.
There are four resistors connected at V1. The electrical connections should be very low resistance (< 1 Ω) in most assembly methods and it won't matter whether they're all soldered to one pin, neatly soldered into a PCB with tracks connecting the common points together, clamped in individual screw terminals with a connecting bar, etc. The important point is that they are all connected and that all four components share the same V1 potential.