Tagged Questions
-5
votes
0answers
20 views
Circuit Diagramm… Controller
i want to make a circuit diagramm which will 1)read the speed of a servo 2)divide the speed of servo 3)with the result of the division will be controlled the speed of an other motor like this ...
0
votes
0answers
38 views
Connecting RJ11 output to TTL to USB converter input through 5 pin TTL
I have a problem in connecting output of RJ11 to TTL socket of the TTL to USB converter.
Actually, I have a micro controller based device which has an RJ11 female port having six pins in it, which I ...
0
votes
2answers
78 views
Digital bargraph display driver circuit
.For a project I need to display a progress bar of the activity performed by my MCU. For this purpose I am going to use a bargraph display, but the problem is that bargraph display driver driver ...
2
votes
1answer
87 views
Reed switch stays ON
I have an anemometer reed switch connected to a uC with a 10K pull-up. I then have a RC filter to debounce around 500Hz. This is the case:
A fairly old anemometer connected to my board powers the ...
2
votes
1answer
62 views
How to detect and identify multiple points of contact
I am looking for a way to detect & distinguish multiple points of contact from force or pressure. I have asked a related question at the URL listed below:
How to encode a large number of digital ...
1
vote
1answer
68 views
Digital Circuit question - sensing input across power rails using a micro
In the Circuit shown below, I am trying to achieve the following (I know my circuit is not correct, it is an attempt).
Problem: WHen INPUT_N = 0V, the input to the microcontroller does not go low.
...
7
votes
4answers
278 views
Can individual pins of different port of a microcontroller be mapped to a register and their values be changed when changing the register value?
Q: Can individual pins of different port of a micro-controller be mapped to a register and their values be changed when changing the register value?
Scenario: I have used up some pins from each ...
13
votes
2answers
584 views
transmitting 5v signal over a long cable
I'm seeking for help here as I need a reliable answer to this. I need to get an input signal (low frequency 5v digital pulse), to a micro-controller from a ...
5
votes
1answer
167 views
What is the function of R1 in this relay driver circuit?
Given the following circuit - (source)
I'm trying to understand the logic of this circuit. Specifically, from the microcontroller, I'm not sure I understand how to switch the transistor "on" (is ...
3
votes
3answers
241 views
Generate a reset signal from a falling edge trigger
I'm working on a microcontroller design where the mcu is placed in hibernation mode, and can only be awoken by a pulse(high-low-high) signal on the reset pin. (active low)
As a wake-up source i'm ...
1
vote
2answers
114 views
Pullup or direct drive when handling active low inputs/resets?
Active-low reset inputs seem to be a holdover from TTL logic where the falling edge was faster than the rising edge, so the falling edge was decided as more important to increase the maximum possible ...
-1
votes
1answer
109 views
Mobile Server Uplink / GPS Coordinate Packet? [closed]
I'm completely uneducated when it comes to more advanced electrical engineering. I understand the very basics. I have over 12 years in software development / programming, but would like to extend my ...
-3
votes
1answer
79 views
Microcontroller
A c515c (8 bit A/D) has the following parameters
Fosc= 11 mega hertz , Vagnd= 0 volts, Varef= 4 volts
What is the +_1 bit round-off % for a 3 volt, measurement?
0
votes
1answer
195 views
Problem Controlling Digital Potentiometer with Micro
I am trying to control a digital potentiometer with a PIC18F14K50 and am having a random problem (potentiometer not remembering correct value) when I power off then back on. The X9313 datasheet states ...
2
votes
1answer
245 views
How to write a simple feedback loop in difference equation?
I know how to write a simple close loop transfer function which is
http://en.wikipedia.org/wiki/Control_theory
Now I need to do it in difference equation form, like the equation in ...
